How to File Form 941 for a Small Business: Quarterly Deposits, Deadlines, and Reconciliations

How to file form 941 small business returns for the first time requires getting the employer registrations in place before the quarter ends and ensuring the EFTPS enrollment is complete before the first deposit deadline. The corporation must have a federal EIN (obtained through Form SS-4), must have enrolled in EFTPS for electronic deposits, and must have a payroll system or process for calculating withholding and FICA. The first Form 941 covers the quarter in which the first payroll was paid, regardless of when the corporation was formed or registered.

If the corporation paid its first wages on April 15, 2026, the first Form 941 is for Q2 2026 (covering April, May, June) and is due July 31, 2026. The first deposit deadline is May 15, 2026 (if monthly depositor) for the April wages. The first payroll filing cycle is so: April 15 first payroll, May 15 first deposit, July 31 first Form 941 filing. The corporation must register with state employer authorities and EFTPS, set up payroll software, and run the first payroll all within the first month, which is tight but workable.

How to file form 941 small business returns for the first time also means deciding the deposit schedule. New employers default to monthly depositor status for the first year regardless of payroll size. The IRS automatically reviews the lookback period in November of each year to determine the next year’s deposit schedule. A corporation that exceeds $50,000 in payroll tax liability during a calendar year typically becomes a semi-weekly depositor the following year. The IRS sends a notice in November or December informing the corporation of any change in deposit schedule.

The first Form 941 filing should be done electronically through the IRS Modernized e-File system. Most payroll software handles e-filing automatically; clients filing manually can use IRS Free File for businesses or paid e-file providers. Paper filing is technically allowed but the IRS strongly prefers e-filing and processing times are much faster electronically. The acknowledgment from the IRS is typically received within 24 hours of e-filing.

How to file form 941 small business returns when the first quarter has no wages is an unusual case. If the corporation has registered as an employer but has not yet paid any wages by the end of the first quarter, Form 941 still needs to be filed showing zero wages. The alternative is to wait to register as an employer until the first wage payment is imminent, but most small business owners register at the same time they form the corporation, which can create a gap quarter before the first payroll runs. The zero-wage Form 941 is a one-page filing and takes 10 minutes to complete.

Workers’ compensation insurance is a separate requirement that must be in place before the first payroll. In New York, workers’ comp coverage is required immediately when the first employee is hired, including the owner-employee of an S corporation. The corporation can purchase coverage through a private carrier (rates around $0.20 per $100 of office payroll, much higher for manual labor) or through the New York State Insurance Fund. The certificate of coverage should be obtained before the first payroll runs and kept on file.

State unemployment registration is also required before the first payroll. New York requires registration on Form NYS-100, with state unemployment tax filed on Form NYS-45 quarterly along with state withholding. The combined state filing (NYS-45) is due the same dates as Form 941 (April 30, July 31, October 31, January 31). Most payroll software handles both federal and state filings, but the corporation must have its state employer ID number established before the first quarter ends.

How to file form 941 small business returns through a payroll service typically means the service handles the entire compliance cycle: calculating withholding, making deposits, filing Form 941, filing the state equivalent, and issuing W-2s. Gusto, OnPay, ADP, and similar services include all of this in their monthly subscription pricing (typically $40 to $100 per month for one to three employees). The corporation reviews the quarterly Form 941 before it is filed but rarely needs to make changes. The administrative simplicity is the main advantage of a payroll service over self-administered payroll.

Our practice handles the first-quarter Form 941 setup for new S corporation clients regularly, and the most common gap is delay in EFTPS enrollment. The 5 to 7 day enrollment window catches clients off-guard when they want to make the first deposit immediately. We typically initiate EFTPS enrollment as soon as the EIN is issued, before the corporation has even hired its first employee, so the system is ready when payroll begins. How to file form 941 small business returns successfully is mostly about getting the infrastructure in place before the first payroll runs, then letting the regular quarterly cycle proceed smoothly. The clients who run into trouble are typically those who delayed the registrations and discovered the missed deadlines after the fact, when the cleanup cost exceeds the original setup work by a wide margin.

Two underrated setup steps: confirm the EIN-to-EFTPS linkage is active before the first deposit, and watch the initial deposit sequencing. EFTPS occasionally rejects deposits when the EIN has not been fully activated in the IRS Master File, which happens for very recently issued EINs (less than 30 days old). The fix is to wait a few days and retry, or to enroll the EIN in EFTPS by phone (1-800-555-3453) rather than online. Business address mismatches between IRS records and the payroll filings trigger CP148 address-change requests that delay the processing of returns; we confirm the IRS-of-record address before filing the first Form 941 and update through Form 8822-B if necessary. On sequencing: a new employer with no prior deposit history sometimes has the EFTPS account in a ‘manual review’ state for the first few deposits, which delays processing 24-48 hours. The actual deposit date for §6656 purposes is the date the funds are debited, not the date the deposit was scheduled. To avoid the late-deposit penalty on the first deposit, we schedule the first deposit at least 3 business days before the deadline. Once the EFTPS history is established (after 2-3 successful deposits), the manual review hold drops off and deposits process normally.

How to file form 941 small business returns when payroll is irregular requires careful tracking of the actual wages paid in each quarter, with deposits made on the schedule based on payday, not on any regular schedule. The IRS does not require regular payroll; the corporation can pay wages on any schedule (weekly, bi-weekly, semi-monthly, monthly, irregular). What the IRS requires is that the deposits and the Form 941 reporting match the actual wages paid in each quarter. Bonuses, year-end true-ups, and irregular payments all flow through the same Form 941 mechanism.

Bonuses are reported on Form 941 in the quarter when paid, with the federal income tax withholding calculated either through the regular withholding tables or through the 22 percent flat rate for supplemental wages under Treas. Reg. §31.3402(g)-1. Most payroll systems default to the 22 percent flat rate for clearly identified bonuses. The FICA and Medicare withholding on bonuses uses the standard rates (6.2 percent SS, 1.45 percent Medicare, plus 0.9 percent Additional Medicare for wages above $200,000 cumulative). The supplemental wage rate applies only to federal income tax withholding, not to FICA or Medicare.

How to file form 941 small business returns when the owner takes a year-end bonus to true up reasonable compensation is a common scenario. The corporation typically maintains a regular bi-weekly or semi-monthly payroll throughout the year at a base amount, then pays a year-end bonus in December (or sometimes January for the prior year, using accrued compensation rules under §404(a)(11)) to bring total compensation to the reasonable comp target. The bonus is taxed at the supplemental rate, included in Box 1, Box 3, and Box 5 of the W-2 (subject to the SS wage base cap), and reported on the Q4 Form 941.

The §404(a)(11) accrued compensation rule allows the corporation to accrue and deduct compensation in one year that is actually paid within 2.5 months of year-end (March 15 for a calendar-year corporation). The owner reports the income in the year of receipt (the year the cash actually arrives). The mismatch between the corporation’s deduction year and the owner’s income year is unusual and not always available; the §267(a)(2) related-party rules typically prevent this for closely held businesses. The cleaner approach is to pay the bonus in the year for which it is intended, reported on that year’s Form 941 and W-2.

How to file form 941 small business returns with multiple pay schedules in the same quarter requires tracking each pay date separately for deposit schedule purposes. If the corporation pays the owner-employee semi-monthly and pays a non-owner employee weekly, the deposit calculation aggregates both employees’ payroll tax for each deposit period. For a monthly depositor, the aggregation is straightforward (total all wages paid in the month, deposit by the 15th of the following month). For a semi-weekly depositor, each pay date is its own deposit calculation, which can produce many small deposits during a busy quarter.

Health insurance flow-through for S corporation owners affects the Form 941 reporting. The premium amount paid by the corporation on behalf of the owner is included in Box 1 of the W-2 but not in Box 3 or Box 5 (per §1372). On Form 941, the owner’s wages on Line 2 should include the health insurance flow-through, but Lines 5a (SS wages) and 5c (Medicare wages) should exclude it. This produces a difference between Line 2 and Lines 5a/5c that is legitimate and expected. The W-2 reconciliation at year-end confirms the same difference.

How to file form 941 small business returns with §401(k) elective deferrals requires understanding that deferrals reduce Box 1 wages but not Box 3 or Box 5 wages. On Form 941, the §401(k) deferral is excluded from Line 2 wages (which should match Box 1 of the W-2). FICA and Medicare wages on Lines 5a and 5c include the deferred amount. So an employee deferring $5,000 of $50,000 in salary has Form 941 Line 2 wages of $45,000 and Form 941 Lines 5a/5c wages of $50,000 for that quarter’s payroll. The W-2 will show Box 1 of $45,000 and Boxes 3 and 5 of $50,000. The reconciliation produces matching numbers when done correctly.

Sick pay and disability payments have their own Form 941 reporting rules. Third-party sick pay (paid by an insurance company on behalf of the employer) is reported on Form 941 by either the employer or the third party, depending on who has the W-2 reporting responsibility. The IRS Pub 15-A provides detailed rules. Most small employers do not encounter third-party sick pay because group disability insurance is rare for very small workforces. When it does apply, the rules are complex and the payroll service or insurance company typically handles the reporting.

Our practice files Form 941 for clients with irregular payroll patterns regularly. How to file form 941 small business returns correctly in these situations comes down to having a payroll system that tracks each pay event accurately and produces clean quarterly reports. The payroll register should reconcile to Form 941 every quarter, and the year-end totals should reconcile to the W-2. We do the reconciliation review as part of the year-end work for every client, catching any mismatches before they become CAWR notice problems. The corporations that get into trouble are usually those that processed bonuses or special payments outside the regular payroll system, breaking the reconciliation chain. Keeping all compensation flowing through the same payroll system is the cleanest practice.

Bonus reporting also interacts with the SS wage base cap. For 2026, the SS wage base is $184,500. An owner-employee who has reached the SS wage base on regular wages by, say, October does not pay employee or employer SS tax on a Q4 bonus, but Medicare tax (no cap) plus the 0.9 percent Additional Medicare on wages above $200,000 still applies. The payroll system handles the cap automatically once configured with the correct year-to-date wage data. Errors arise when wages are processed outside the regular system (a year-end bonus paid through a check rather than through the payroll system) and the wage base tracking gets disrupted. Reconciling SS wages on Form 941 Line 5a against the cumulative year-to-date wages at the end of each quarter catches this issue before it becomes a W-2 mismatch.

How to file form 941 small business returns after missing a quarter requires filing the missed return as soon as possible to stop the running of penalties. The §6651(a)(1) failure-to-file penalty is 5 percent of the unpaid tax per month, capped at 25 percent of the unpaid tax. The §6656 failure-to-deposit penalty is 2 to 15 percent depending on how late. Both penalties run concurrently and accrue from the original due date until paid. Interest under §6601 at the current rate (around 8 percent annually) also accrues. Filing late is always more expensive than filing on time, and the longer the delay, the higher the cost.

If the corporation missed Q2 2026 Form 941 (due July 31, 2026) and discovers the miss in October 2026 when preparing Q3, the Q2 return should be filed immediately. The form is the same Form 941, just filed late with the late-filing and late-payment penalties calculated and paid with the return. The IRS will assess additional penalties through CP161 if the calculated amount on the late return is incorrect, but filing late voluntarily is much better than waiting for the IRS to send a Substitute for Return (SFR) notice.

How to file form 941 small business returns after multiple missed quarters becomes a serious cleanup project. The corporation must reconstruct the payroll records for each missed quarter, calculate the wages, withholding, and tax for each period, prepare the late Form 941 for each quarter, calculate the penalties and interest, and make the deposits or payment with the returns. The total exposure can be substantial: for an S corporation paying the owner $120,000 annually, the quarterly tax of about $4,500 plus four quarters of penalties and interest can easily reach $25,000 to $35,000 in cleanup cost.

Reasonable cause for late filing can sometimes reduce or eliminate the §6651 penalty (but not the §6656 penalty or interest). The taxpayer must show that the failure was due to reasonable cause and not willful neglect. Acceptable reasons include serious illness, death of a family member, fire or natural disaster destroying records, or reliance on incorrect advice from a tax professional. “I forgot” or “I was busy” are not reasonable cause. The first-time abatement option under IRM 20.1.1.3.6.1 allows abatement of the §6651 penalty for a first-time delinquency if the taxpayer has a clean compliance history for the past 3 years.

How to file form 941 small business returns when the IRS has already assessed an SFR (Substitute for Return) requires filing the correct Form 941 to replace the SFR. The IRS prepares an SFR when the taxpayer fails to file and the IRS has information suggesting wages were paid. The SFR is based on the IRS’s best estimate of the tax owed, which is usually higher than the actual amount because it does not include any deductions or adjustments. Filing the correct return supersedes the SFR and recalculates the actual tax owed.

Trust fund recovery penalty exposure under §6672 is the most serious risk of missing Form 941 deposits. The trust fund portion of the payroll tax (federal income tax withheld plus employee FICA and Medicare) is held in trust for the IRS by the employer. Failing to pay it over triggers personal liability for the responsible officers of the corporation. The IRS pursues TFRP cases through Letters 1153 (notice of proposed assessment) and Letter 1058 (final notice of intent to levy). The 100 percent penalty extends to all responsible persons jointly and severally. CP136 is the notice of TFRP assessment.

How to file form 941 small business returns when the corporation cannot afford to pay the late tax requires arranging a payment plan with the IRS. Form 9465 (Installment Agreement Request) sets up monthly payments over up to 72 months for liabilities under $50,000. For larger liabilities, the streamlined installment agreement still works but requires more documentation. The IRS charges a user fee for installment agreements ($31 for direct debit, higher for other payment methods) and continues to accrue interest on the unpaid balance during the agreement period. Penalties stop accruing once the agreement is in place and being honored.

Voluntary disclosure of missed Form 941 filings is generally encouraged. The IRS has stated that voluntary filings reduce the likelihood of criminal referral under §7202 (willful failure to collect or pay over tax). The §7202 felony charge carries up to 5 years in prison and substantial fines and is reserved for egregious cases of willful evasion. Most small business owners who simply got behind on filings are not at risk of criminal charges if they come forward voluntarily and pay the back tax. The civil penalties and interest are the typical exposure.

Our practice handles Form 941 cleanup cases regularly. How to file form 941 small business returns after a period of non-compliance starts with the reconstruction of the payroll records, the calculation of the correct tax for each missed quarter, and the prioritization of the filings (typically newest first, then working backward, but the strategy varies by case). We coordinate with the IRS to manage the penalty exposure, pursue reasonable cause abatement where applicable, and set up payment plans for clients who cannot pay in full immediately. The cost of cleanup is always more than the cost of timely compliance would have been, but the cleanup is straightforward if approached methodically. The clients who run into the worst problems are those who continue to defer the cleanup hoping the IRS will not notice; the IRS always notices eventually, and the eventual enforcement is much more expensive than voluntary cleanup.

One tactical detail for the catch-up scenario: file the current quarter on time first, then work backward through the missed quarters. The IRS treats the current filing as evidence of current compliance, which can support a reasonable cause argument for the prior quarters. Conversely, if the cleanup starts with the oldest quarter and progresses forward, the IRS may view the corporation as still being out of compliance through the catch-up period because the current quarter has not been addressed. The order of operations is administrative theater but it affects how IRS personnel perceive the case. We always file the next scheduled return on time even while the cleanup of prior quarters is underway, and we include a written explanation referencing the broader cleanup effort so the IRS understands the full picture from the start.

How to file form 941 small business returns for a multi-state corporation is conceptually simple at the federal level but complex at the state level. Form 941 is a federal return and is filed once per quarter regardless of how many states the corporation operates in. The wages reported on Form 941 are all U.S. wages paid by the corporation, summed across all employees regardless of work location. The federal withholding, FICA, and Medicare are also aggregated. So a corporation with employees in New York, New Jersey, and Pennsylvania files one Form 941 with the combined total payroll across all three states.

The state side is where the multi-state complexity lives. Each state where the corporation has employees has its own employer registration, withholding return, and unemployment return. New York uses Form NYS-45 quarterly. New Jersey uses Form NJ-927 quarterly. Pennsylvania uses Form PA-W3 quarterly. California uses Form DE-9 quarterly. Each state has its own deposit schedule, deadline, and reporting requirements. Payroll software typically handles all states the corporation has registered in, but the corporation must register in each state where wages are paid.

How to file form 941 small business returns when an employee works in multiple states requires sourcing the wages correctly. The general rule is that wages are sourced to the state where the work is performed, not where the employee lives or where the corporation is headquartered. An employee who lives in New Jersey but works in New York City has New York-source wages, subject to New York state and city withholding. The corporation registers as a New York employer and remits the withholding to New York. New Jersey requires the employee to file a personal return claiming credit for tax paid to New York.

Remote workers complicate the analysis. An employee who lives and works in Florida (no state income tax) for a New York-based corporation has Florida-source wages. The corporation does not need to withhold New York state or city tax for that employee. But the corporation may still need to register as a Florida employer for unemployment tax purposes, even though Florida has no income tax withholding. The state-by-state registration is required wherever the corporation has wages paid, not just where it has a physical office.

How to file form 941 small business returns for a corporation with traveling employees (sales reps, consultants who travel to client sites) requires deciding on a sourcing method. The strict rule is that wages are sourced to the location of the work, which for a traveling employee means day-by-day allocation across multiple states. Most corporations use the convenience rule (employees are sourced to the home office unless they work a substantial portion of their time elsewhere) or a primary work location rule (employees are sourced to the state where they perform the majority of their work). The state where the employee lives often becomes the default if no other state has a strong claim.

New York’s convenience-of-employer rule under New York Tax Law §618 sources non-resident employees of New York employers to New York for any days worked outside New York unless the employer required the employee to work outside the state for a bona fide business reason. The rule is harsher than most other states and has been challenged repeatedly. Connecticut, Massachusetts, and a few other states have similar rules. Most other states (including New Jersey, Pennsylvania, California) source non-resident wages based on where the work is actually performed.

How to file form 941 small business returns when an employee moves between states mid-year requires splitting the wages between the prior state and the new state on the W-2 at year-end. The Form 941 quarterly reporting does not split the wages because the federal return aggregates everything. The state returns split the wages based on the period of residency or work in each state. The W-2 may show wages allocated to multiple states (Box 16 lists state wages, with multiple line items if needed). The payroll system needs to track the date of move and reallocate the wages so.

Reciprocity agreements between states can simplify the multi-state withholding. New Jersey and Pennsylvania have a reciprocity agreement; New Jersey residents working in Pennsylvania are not subject to Pennsylvania withholding (they pay only New Jersey tax). New York has no reciprocity agreements with neighboring states, which means New York residents working out-of-state are subject to both states’ taxes (with a credit on the New York return for tax paid to the other state). The complexity of multi-state withholding is one reason many small businesses choose to register their corporations in a single state and hire locally rather than going multi-state.

Our practice handles multi-state payroll setup for S corporations regularly. How to file form 941 small business returns is the easy part; the state registrations and ongoing compliance are where the work lives. We typically register the corporation in each state where it has employees, set up the payroll software with the correct state withholding for each employee, file the state returns quarterly alongside Form 941, and reconcile the state totals to the W-2 wages at year-end. For corporations with traveling employees or remote workers, we work through the sourcing analysis annually to confirm the wages are allocated correctly. The compliance complexity scales linearly with the number of states the corporation operates in, but the per-state cost is manageable. The clients who get into trouble are typically those who hired in multiple states without registering, then face state notices and back taxes after the fact.

An overlooked piece of multi-state compliance: state unemployment claim activity. When an employee leaves the corporation and files for unemployment in their work state, the state agency sends a claim notice to the corporation. The corporation must respond within a tight window (typically 10 days) confirming or contesting the claim. Missing the response window can result in the claim being approved automatically and the corporation’s experience-rating SUTA rate going up. Multi-state corporations need to monitor claim notices in every state where they have current or former employees. We coordinate this through the payroll service for most clients, but the corporation remains the legally responsible party. Claim notices are easy to miss when they arrive at a corporate address by mail rather than electronically.

How to file form 941 small business returns claiming payroll tax credits requires understanding which credits apply, what documentation is needed, and how the credits flow through Lines 11a through 11g of Form 941. The major payroll tax credits historically have included the Employee Retention Credit (ERC) under §3134, the COBRA premium assistance credit under §6432, the credit for paid sick and family leave under §3131-3133, and the research credit under §3111(f). Most of these are time-limited or have been phased out. The ERC specifically is the largest credit in recent history and is now in the recovery phase with most claims being audited.

The Employee Retention Credit applied to qualified wages paid from March 2020 through September 2021 (with limited 2021 Q4 application for recovery startup businesses). The credit is claimed retroactively on Form 941-X (Adjusted Employer’s Quarterly Federal Tax Return) for the relevant quarter. The credit amount is 50 percent of qualified wages (up to $10,000 per employee per year) for 2020 and 70 percent of qualified wages (up to $10,000 per employee per quarter) for 2021. The maximum credit per employee was $5,000 for 2020 and $21,000 for 2021. Many small businesses claimed substantial ERC amounts, particularly during the second half of 2020 and the first three quarters of 2021.

How to file form 941 small business returns for ERC claims now requires extensive documentation. The IRS has been auditing ERC claims aggressively since 2024, with a particular focus on claims prepared by promoter firms that took percentage fees. The documentation needed includes: (1) proof of partial suspension of business operations due to government orders or significant decline in gross receipts compared to 2019 baseline, (2) calculation of qualified wages including health insurance allocations, (3) confirmation that the same wages were not claimed for both ERC and PPP forgiveness (no double-dipping under §3134(c)(2)), and (4) supporting documentation including government order excerpts, financial statements, and payroll records.

The IRS announced a moratorium on processing new ERC claims in September 2023 and has been working through the backlog. Claims that have been denied can be appealed through the IRS Appeals Office or through Tax Court. Claims that have been paid can still be examined and clawed back if found unsupported. The IRS has also offered an ERC Voluntary Disclosure Program for taxpayers who received ERC funds but believe they did not qualify, allowing them to return 80 percent of the funds without penalty.

How to file form 941 small business returns claiming the paid sick and family leave credits is no longer applicable for new wages. The §3131-3133 credits applied to wages paid from April 2020 through September 2021 (with some extensions for self-employed taxpayers through certain provisions of the American Rescue Plan). The credits were claimed on Form 941 by employers and on Form 7202 by self-employed individuals. New claims are no longer possible; only amended returns for the credit period are still being processed.

The research credit under §3111(f) allows certain qualified small businesses (defined as having gross receipts less than $5 million for the credit year and no gross receipts more than 5 years before the credit year) to claim a portion of their §41 research credit against payroll tax rather than income tax. The credit is claimed on Form 6765 (filed with the income tax return) and then transferred to Form 941 quarterly. The mechanism allows startups with research activities but no income tax liability to monetize the research credit through payroll tax reduction. The maximum payroll tax offset under §3111(f) is $500,000 per year (increased from $250,000 by IRA 2022).

How to file form 941 small business returns with the research credit payroll offset requires reporting the credit on Line 11a (qualified small business payroll tax credit for research activities) of Form 941. The credit reduces the employer’s share of social security tax on Line 5a. The credit cannot exceed the employer’s social security tax for the quarter, with any unused credit carried forward to subsequent quarters. The corporation also files Form 8974 (Qualified Small Business Payroll Tax Credit for Increasing Research Activities) to support the credit claim.

Documentation for any payroll tax credit must be preserved for at least 4 years from the latest of (1) the date the credit was claimed, (2) the date the return was filed, or (3) the date the tax was paid. For ERC claims, given the active audit environment, we recommend preserving documentation for 7 years or longer. The documentation should include the eligibility analysis, the wage calculations, supporting evidence of qualifying conditions, and copies of all Forms 941 and 941-X filed. Without strong documentation, ERC claims are nearly impossible to defend on audit, and the IRS will typically deny the credit and assess the underlying tax plus penalties and interest.

Our practice files Form 941 with payroll tax credits where applicable and handles ERC examinations for clients who claimed the credit in 2020-2021. How to file form 941 small business returns with credits is mostly about getting the underlying eligibility right, documenting the qualification thoroughly, and reporting the credit on the correct lines of Form 941 (or 941-X for retroactive claims). The clients who run into problems are typically those who relied on aggressive promoter firms to determine eligibility without verifying the qualifying conditions independently. The IRS is now systematically reviewing those claims and clawing back the credits where the documentation is insufficient. Going forward, the active credits are smaller and more narrowly applicable, but the ERC legacy issues will continue to play out through 2027 and 2028 as the IRS works through the audit backlog. Clients with outstanding ERC claims should expect IRS follow-up and should have their documentation ready to support the qualification analysis.

For S corporation owners specifically, ERC complications run deeper because of the related-party restrictions. Wages paid to majority owners and their family members (spouse, parents, children, siblings) under §51(i)(1) are not qualified wages for ERC purposes. Many promoter firms ignored this rule and claimed ERC on owner-employee wages, which the IRS is now disallowing on audit. Clients who claimed ERC on owner wages should expect the full credit to be disallowed plus penalties and interest. The §51(i)(1) attribution rules are tight; even cousins and nephews of more-than-50-percent owners are excluded under certain conditions. The cleanup of these claims is involved and expensive, and the corporations that claimed the largest ERC amounts based on owner wages face the largest exposures.