2026 Tax Deadlines: The Complete Filing Calendar

This page tracks the federal dates that a closely held business and its owners actually have to meet, drawn from Publication 509 and the filing guidance the IRS issues each season. The tax deadline database opens with the income tax returns themselves, because everything else on a client calendar tends to be scheduled around them. Dates below apply to calendar-year filers. A fiscal-year entity works from the same rule structure with different months, and we set those out on the engagement calendar rather than here, since a June year end and a September year end produce two different schedules from one paragraph of law.

For the 2025 tax year filed in 2026, a partnership return on Form 1065 and an S corporation return on Form 1120-S were both due Monday March 16, 2026, because March 15 fell on a Sunday. Each extends six months on Form 7004, to September 15, 2026. A C corporation return on Form 1120 was due April 15, 2026 and extends to October 15, 2026. The individual return on Form 1040 was due Wednesday April 15, 2026 and extends to October 15, 2026. An exempt organization filing Form 990 was due May 15, 2026, with an extended date of November 16, 2026. Two of those dates carry a note. The extended pass-through date of September 15, 2026 sits a full month ahead of the extended individual date of October 15, 2026, which is deliberate rather than accidental. State filing dates are a separate matter and do not always match the federal one, so a business operating across state lines needs a second column on the calendar. Federal dates are what this page lists.

An extension moves the filing date and nothing else. Take an owner who expects a 9,000 dollar balance on the 2025 individual return and files for an extension on April 14, 2026. The paperwork buys until October 15, 2026 to file, but the 9,000 dollars was still due Wednesday April 15, 2026, and interest and additions to tax start from that date on whatever went unpaid. A client who sends 9,000 dollars with the extension request and later discovers the real number was 9,600 dollars is in far better shape than one who sent nothing at all. Payment options are collected on the IRS payments page.

The mistake we see every spring is a shareholder who assumes the corporate return and the personal return share a date. They do not, and the gap exists for a reason. The March 16, 2026 date for a pass-through entity was set a month ahead of the individual date so that every owner has a Schedule K-1 in hand before the personal return is prepared. When the entity extends to September 15, 2026, the owners almost always extend too, and a partnership that waits until September to distribute figures has handed its partners an October scramble.

Two habits keep this from becoming an annual emergency. Put the entity date and the owner date on the same calendar in December rather than treating them as separate projects, and close the books monthly so that March is a review rather than a reconstruction. Our bookkeeping team works to that rhythm, and our individual return group schedules owner appointments against the entity calendar. We update this tax deadline database when the IRS publishes the next filing season’s dates, and we do not post a 2027 date here before it is announced.

One rule explains nearly every odd date on the 2026 calendar. When a filing or payment date falls on a weekend or on a legal holiday, the date moves forward to the next business day. It never moves backward, which means a taxpayer never loses a day to the calendar. The rule is old and plain, and it accounts for most of the confusion in any year where the middle of a month lands badly. It reaches payments as well as filings, so a deposit or an estimated payment falling on a Sunday is timely on the following Monday.

Three shifts came out of that rule in 2026. March 15, 2026 was a Sunday, so the partnership and S corporation returns moved to Monday March 16, 2026. January 31, 2026 was a Saturday, so the whole January wage and information return batch moved to Monday February 2, 2026. October 31, 2026 is a Saturday, so the third-quarter employment tax return moves to Monday November 2, 2026. Nothing about those moves is discretionary, and none of them required an announcement from the IRS to take effect.

Emancipation Day deserves its own paragraph, because it is the source of a recurring rumor. The District of Columbia holiday is treated as a legal holiday for federal filing purposes, and in some years its observance pushes the individual filing date into the following week. That is not what happened here. For 2026 the observed date is Thursday April 16, the day after the individual deadline, so it did not extend anything. The individual return stayed on Wednesday April 15, 2026. Anyone who read an older article and applied it to this year got the wrong answer. The mechanics repeat on a predictable cycle and are worth learning once. Emancipation Day is observed on April 16, and when April 16 falls on a Saturday the observance moves back to Friday April 15, which pushes the national filing date to the following Monday. In 2026 the sixteenth was a Thursday, so the observance stayed where it was and the filing date did not move at all.

The dollars attached to that mistake are easy to picture. A taxpayer with a 7,500 dollar balance who mailed the return and the check on April 16, 2026 filed late by one day. Interest and additions to tax ran from April 15, and a return filed even one day past the date can also cost a first-time abatement that the client might have wanted for a bigger problem later. The IRS explains the current-season filing dates on its when to file page, and Form 4868 is the automatic extension request for an individual who needs more room.

Timeliness itself has rules worth knowing. A paper return mailed with a United States Postal Service postmark on the due date is timely even though it arrives later, and an electronically filed return is timely by its transmission record. Keep the certified mail receipt or the acknowledgment file with the year’s business records, because proof of filing is the cheapest insurance in tax practice. A return rejected by the electronic system on the due date is not automatically treated as timely either. A short repair window applies and it is measured in days rather than weeks, so a first transmission attempted late on the evening of the due date is a poor plan. Our planning team keeps the acknowledgments with each year’s file, and our accounting staff reconciles them against the client calendar. We will publish the 2027 shifts in this tax deadline database once the calendar for that year is settled.

January is the heaviest month in payroll, and in 2026 it spilled into February. Because January 31, 2026 fell on a Saturday, four separate obligations landed on Monday February 2, 2026. Employers had to furnish Form W-2 to employees and file the copies with the Social Security Administration, furnish Form 1099-NEC to recipients and file it with the IRS, file the annual federal unemployment return on Form 940, and file the fourth-quarter 2025 employment tax return on Form 941. One date, four filings, which is why a small employer who waits until the last week of January is in trouble by the twenty-eighth. Form W-2 carries the same date for the employee copy and for the government copy, a point that still catches out payroll software configured a decade ago.

Other information returns run on a later schedule that splits by filing method. Paper filings to the IRS were due March 2, 2026, and electronic filings were due March 31, 2026. That is a meaningful gap for a business with a large volume of forms, and the electronic route is the one that buys the extra weeks. The recipient copies still go out on the earlier schedule, so a business cannot use the March date to delay the statement a contractor is waiting on.

Quarterly employment tax returns for 2026 fall on April 30, July 31, and Monday November 2, 2026, with the third-quarter date moved because October 31, 2026 is a Saturday. An employer who deposited every liability on time for the quarter gets a further ten days to file, which produces May 11, August 10 and November 10, 2026. That extra window rewards clean deposit behavior and disappears the moment a deposit is missed. Details on the quarterly return sit on the About page for Form 941. Deposits run on a separate schedule that these return dates do not cover. An employer on a semiweekly deposit schedule cannot substitute a return date for a deposit date, and the extra ten days described above are available only where every deposit for the quarter was made in full and on time.

One reporting threshold changed for 2026 and it will surprise a lot of small payers. The general reporting threshold for Form 1099-NEC and Form 1099-MISC rose from 600 dollars to 2,000 dollars for payments made on or after January 1, 2026, and it is indexed after 2026. The change reaches the general reporting rules only. Attorney gross proceeds and trade-or-business interest reporting were not amended, and liquidating distributions were left alone as well, so those categories stay at 600 dollars. A firm that paid four contractors 1,400 dollars each during 2026, a total of 5,600 dollars, has no general reporting obligation for those payments, while the same payments made during 2025 would have required four forms.

The mistake here is treating recipient copies and government copies as one task. They carry different dates for several forms, and a business that mails the contractor statements on time while sitting on the government copies has only done half the job. Keep the payee information current instead, collecting a Form W-9 before the first check rather than in January, so the name and identification number are already right. Our bookkeeping service collects those forms at vendor setup, and our advisory team reviews contractor classification before year end. Employers adding staff in 2027 should revisit this section of the tax deadline database in December.

Estimated tax dates for 2026 are April 15, June 15, September 15, 2026 and January 15, 2027. None of them shifted this year, since each falls on a business day. The pattern is uneven on purpose, with two payments arriving two months apart in the middle of the year, and a cash-basis business that budgets by the quarter often finds June tighter than expected. Payments are computed and mailed with Form 1040-ES or sent electronically. Corporations follow their own quarterly pattern and a fiscal-year filer works from its own months, so the four dates above belong to a calendar-year individual.

The amount is governed by a safe harbor rather than by a guess. Section 6654 asks for the smaller of 90 percent of the current year tax or 100 percent of the prior year tax. The prior-year figure rises to 110 percent when prior-year adjusted gross income was more than 150,000 dollars, or more than 75,000 dollars for a married taxpayer filing separately. Paying to the prior-year number is the calmer route in a growth year, because the target stops moving once last year’s return is filed, and the balance simply settles at filing.

Here is the arithmetic on a real situation. A consultant’s 2025 total tax was 48,000 dollars and her 2025 adjusted gross income was above 150,000 dollars, so her safe harbor for 2026 is 110 percent of 48,000 dollars, which is 52,800 dollars. Divided across four payments, that is 13,200 dollars due on each of April 15, June 15, September 15, 2026 and January 15, 2027. If 2026 turns out much stronger, she still owes the difference at filing, but the underpayment addition is off the table because she met the harbor. If 2026 turns out weaker, she can shift to the 90 percent test and pay less. Uneven income argues for a different approach. A seasonal business can use the annualized income method to line payments up with the quarters when the money actually arrived, which takes more work at filing and often produces a much smaller number in the first half of the year.

Two mistakes cost clients money every year. The first is skipping the January 15, 2027 payment on the theory that the return is nearly due anyway. The addition to tax is computed period by period, so a missed fourth payment is not cured by a large check in April. The second is ignoring withholding. Amounts withheld from wages or from a retirement distribution are generally treated as paid evenly across the year regardless of when they were actually withheld, which gives a two-earner household a repair option in November that a purely self-employed taxpayer does not have. Publication 505 covers both points in detail.

Mechanics matter as much as the math. A payment made through IRS Direct Pay produces a confirmation number the same day, which is far better evidence than a bank statement showing a cleared check three weeks later. Apply each payment to the right year and the right period, because a payment posted to 2025 when it was meant for the first 2026 period creates a notice that takes months to unwind. Our tax strategy consulting team recalculates the coupons in June and again in September, and our return preparers reconcile every payment before filing. Anyone whose 2027 income will look nothing like 2026 should ask for a fresh projection rather than repeating this year’s coupons.

Plenty of federal obligations have nothing to do with an income tax return and still carry hard dates. The foreign account report, FinCEN Form 114, was due April 15, 2026 with an automatic extension to October 15, 2026. No request is needed for that extension, which makes it the friendliest deadline in federal tax administration and also the one people forget entirely. The report is filed through the BSA E-Filing System rather than with the tax return, and it is a separate filing even for a taxpayer whose accounts are already reported elsewhere on the return.

The threshold is measured in aggregate and at a peak, not at year end. A taxpayer files when the combined maximum value of the foreign financial accounts exceeded 10,000 dollars at any point during the year. Picture four accounts held abroad during 2025 with high balances of 4,000 dollars, 3,500 dollars, 2,400 dollars and 1,100 dollars. The aggregate is 11,000 dollars, so the report is required even though no single account came close to the threshold on its own. A taxpayer who looks only at the December 31 balances, or only at the largest account, reaches the wrong conclusion. Signature authority counts as well. An employee who can move money in an employer’s foreign account may have a filing obligation even though none of the money belongs to that employee, which regularly catches finance staff at companies with overseas operations.

Retirement plans carry their own calendar. The annual report on Form 5500 for a calendar-year plan was due July 31, 2026. An extension is requested on Form 5558, and a plan sponsor should confirm the extended date with the plan administrator rather than assuming a length, because the plan filing rules sit outside the income tax return system. Employers who sponsor a plan should keep that date on the same calendar as the payroll filings, and Publication 560 describes the plan types a small employer is most likely to have, since the census data behind the report comes from the same records. A missed plan report costs far more than the paperwork suggests, and a sponsor who discovers the filing was skipped should ask about the voluntary correction program rather than waiting for a notice to arrive.

Exempt organizations round out the list. A calendar-year Form 990 was due May 15, 2026 with an extended date of November 16, 2026. The organizations that get into trouble are the small ones with volunteer treasurers and no bookkeeping routine, and the consequences of repeated non-filing reach the organization’s exempt status rather than its checkbook. A board that reviews the filing calendar at its first meeting of the year almost never has this problem, and a board that never looks at it usually does. Reinstatement after a revocation is possible and it is slow, and grant funders tend to notice. Background on entity obligations sits on the IRS small business and self-employed hub.

The common mistake across all of these is treating a date as a filing task instead of a data task. The FinCEN report needs a maximum value for every account, the plan report needs a participant count, and neither number can be reconstructed the night before. Build the underlying records during the year, keep them with the rest of the recordkeeping the business already maintains, and the filings become clerical. Owners with foreign accounts or a plan to sponsor can request a consultation before the year turns, and our accounting team tracks the supporting data monthly. We will expand this tax deadline database as further 2027 dates are published, and we will not list one before then.