S Corporations Guide: Federal, NY and NYC Taxation

An S corporation is a regular corporation or an LLC that has elected to pass its income through to the owners instead of paying tax at the entity level. The rules that decide who qualifies live in IRC 1361, and they are strict. To be eligible you have to be a domestic entity, you can have no more than 100 shareholders, every shareholder has to be a US citizen or resident individual, certain trusts, or an estate, and the company can have only one class of stock. No partnerships as owners, no other corporations as owners, no nonresident aliens. The IRS lays all of this out plainly on the S corporations page, and I send clients there before we file anything. The penalty for ignoring these limits is severe, because a single disqualifying owner or a second class of stock can void the election back to day one.

The one class of stock rule trips people up more than the headcount. One class of stock means all shares carry identical rights to distributions and liquidation proceeds. Voting differences are fine, so you can have voting and nonvoting common and still qualify. But if one owner gets a fatter distribution per share than another, you have just created a second class of stock, and the election can be retroactively voided. A husband and wife count as one shareholder for the 100 limit, which helps family businesses. Certain trusts qualify too, but a regular grantor trust has its own filing requirements once the grantor dies, so plan ahead. Nonresident alien owners are an automatic disqualifier, which matters in a city like New York where ownership groups are often international. If a green card holder lets their status lapse, the company can lose its S status without anyone noticing until the return is prepared.

The election itself runs on Form 2553. You file it with the IRS, signed by every shareholder, and the timing matters. For a new entity you generally have two months and fifteen days from the start of the tax year you want the election to take effect. For an existing calendar-year corporation that means by March 15. Miss it and you are usually stuck waiting until the next year, though late election relief under Rev. Proc. 2013-30 is available if you have reasonable cause and the entity has otherwise acted like an S corp. The official details sit on the About Form 2553 page. We see this every year. A client forms an LLC in January, runs payroll all year thinking they are an S corp, then learns in March they never actually filed the 2553. We can usually fix it with late relief, but it is a needless scramble that puts the whole year at risk.

One edge case worth flagging. If you form an LLC and want S treatment, you do not need a separate Form 8832 first. A timely Form 2553 is treated as both the corporate classification election and the S election. That saves a step. Another edge case is the mid-year incorporation, where the two month and fifteen day window starts on your first day of existence, not January 1, so a June startup has an August deadline. If you are weighing whether the election even makes sense for your situation, our entity formation and structuring team walks through it before you commit. And if you already have an entity and want to convert, we handle the filing and the timing math so the deadline does not catch you. Reach out through our new client inquiry form and we will tell you whether you are eligible and what the election deadline looks like for your specific year.

One more practical point on eligibility timing. The IRS will send you a CP261 notice confirming your S election was accepted, and you should keep that letter forever, because banks, buyers, and your own future preparer will ask for proof. If you never get that notice within about 60 days of filing the 2553, call the IRS and confirm it was processed, do not assume silence means yes. We have seen elections that were rejected for a missing shareholder signature sit unnoticed for two years until an audit surfaced it. The cleanup is painful and the tax cost of being treated as a C corp for those years can be large. File the 2553 cleanly, confirm acceptance, and store the CP261. That small habit prevents the worst version of an eligibility problem, which is finding out years later that you were never an S corp at all and owe corporate tax plus penalties on income you already reported personally.

Pass-through taxation is the whole reason most people elect S status. The corporation itself does not pay federal income tax on its operating profit. Instead the income, deductions, and credits flow out to the owners in proportion to their stock, and each owner reports the share on a personal return. That is how an S corp sidesteps the double taxation a C corporation faces, where the company pays tax on profit and then shareholders pay again on dividends. The IRS explains the flow-through mechanics on the S corporations page, and it is the foundation everything else in this guide rests on.

The vehicle for that flow is the Schedule K-1. The S corp files Form 1120-S, its informational return, and as part of that filing it issues each shareholder a Schedule K-1 reporting that owner’s piece of every income and deduction item. You take the K-1 and carry the numbers onto your Form 1040, mostly through Schedule E. The K-1 separates items that keep their character, so capital gains stay capital gains, charitable contributions stay charitable contributions, and the section 199A qualified business income amount is reported separately so you can compute that deduction. The IRS describes the form on the About Schedule K-1 for Form 1120-S page, and the parent return is covered on the About Form 1120-S page. The S corp return is due March 15, a full month before the personal return, precisely so owners have their K-1 in hand before April 15.

Here is the part that surprises new S corp owners. You pay tax on your share of the profit whether or not the company actually hands you the cash. Allocation, not distribution, drives the tax. Say the company nets 200,000 dollars and you own half. You report 100,000 dollars of pass-through income even if the company kept every dollar to buy equipment or pay down debt. The flip side is that when the company does distribute that already-taxed money, the distribution itself is generally tax free because you paid tax on it the year it was earned. That mismatch between taxable income and cash in hand is why we push owners to keep enough set aside for the estimated tax payments due each quarter, on April 15, June 15, September 15, and January 15.

A worked example. An S corp earns 300,000 dollars of ordinary business income with two equal owners. Each gets a K-1 showing 150,000 dollars of ordinary income plus a separately stated 150,000 dollars of qualified business income for the 199A deduction. At the 2026 standard deduction of 32,200 dollars for a married couple filing jointly, an owner still has meaningful taxable income, but the 199A deduction can knock up to 20 percent off the qualified portion, subject to the wage and income limits. We see this every year. Owners forget the K-1 income is theirs to report and skip quarterly estimates, then face an underpayment penalty in April that runs at the IRS interest rate. Another common slip is a shareholder who moves states mid-year and never tells us, leaving the K-1 income sourced to the wrong place. If your K-1 numbers feel like a black box, our corporate returns group prepares the 1120-S and the K-1s so the personal side lines up. Questions on a specific K-1 box go to our new client inquiry form.

A final note on how the K-1 interacts with your quarterly planning. Because you are taxed on allocated income rather than cash received, your safe-harbor estimate should be built off projected K-1 income, not last year’s distributions. The federal safe harbor is generally 110 percent of last year’s tax for higher earners, and hitting it avoids the underpayment penalty even if the company has a banner year. New York and New York City impose their own estimated payment rules on top, and the city does not care that you are an S corp. We build a quarterly schedule that folds the federal, state, and city pieces together so a strong year does not turn into an April surprise. The K-1 is not just a tax form, it is the number your whole personal cash plan should run off, and treating it that way is what separates owners who sleep in April from those who scramble.

Reasonable compensation is the single biggest audit risk for an S corporation, and any honest guide has to put it front and center. The rule is simple to state and easy to get wrong. If you are an owner who works in the business, the S corp has to pay you a reasonable salary as a W-2 employee before it distributes profit to you as an owner. The IRS cares because salary carries payroll tax and distributions do not. An owner who zeroes out salary to dodge Social Security and Medicare tax is exactly who the IRS looks for, and they have won these cases in court repeatedly, recharacterizing distributions as wages and tacking on penalties.

The mechanics run through payroll. Your reasonable salary goes on a W-2, the company withholds income tax and the employee share of FICA, and it pays the employer share. It files Form 941 each quarter to report that and Form 940 for federal unemployment. The combined Social Security and Medicare rate is 15.3 percent, split between employer and employee, and for 2026 the Social Security portion applies up to a wage base of 184,500 dollars. Above that only the 1.45 percent Medicare piece continues, plus the 0.9 percent additional Medicare tax for high earners. The remaining profit after your salary passes through on your K-1 free of that 15.3 percent. That gap is the whole tax benefit of the S corp, but it only holds if the salary is defensible. Skip payroll entirely and you have a bigger problem, because the IRS can treat every dollar you took as wages.

What counts as reasonable. The IRS weighs your training, your duties, the hours you put in, what comparable businesses pay someone doing your job, and how much of the profit traces to your personal effort versus invested capital. There is no magic percentage, despite what you read online. A worked example shows the stakes. Say your S corp nets 200,000 dollars and you set salary at 80,000 dollars, which is reasonable for your role and market. You pay roughly 12,240 dollars of combined FICA on the salary, and the remaining 120,000 dollars passes through with no Social Security or Medicare tax. Compare that to a sole proprietor who pays self-employment tax on the full profit, which would be well over 25,000 dollars of SE tax. That is real money saved, and it is legitimate when the salary holds up under scrutiny.

We see this every year. An owner reads a blog that says pay yourself 60 percent of profit as salary, applies it to a 500,000 dollar business with a 40,000 dollar salary, and the number is indefensible for a high earner. If the IRS recharacterizes distributions as wages, you owe the back payroll tax plus penalties and interest, and the bill can run into five figures fast. The edge case to watch is the owner who takes no salary at all in a lean year. If the company had profit and you worked in it, taking zero is a red flag even when cash was tight. Another edge case is the owner health insurance premium, which an S corp adds to the more-than-2-percent shareholder’s W-2 and then deducts above the line on the 1040. Our tax strategy consulting team sets a salary figure we can support with comparables, and our corporate returns group handles the payroll filings. Start at our new client inquiry form.

One last angle on payroll that owners overlook. Running real payroll is not just about the salary number, it unlocks retirement contributions that distributions cannot. Only W-2 wages count as compensation for a solo 401k or SEP, so your reasonable salary sets the ceiling on how much you can shelter. For 2026 the employee 401k deferral is 24,500 dollars with an 8,000 dollar catch-up at age 50 and over, and the employer profit-sharing piece is a percentage of that W-2 wage. Set salary too low purely to cut FICA and you may cap your own retirement savings far below where it could be. We model the salary against both the payroll tax savings and the retirement room, because the lowest defensible salary is not always the smartest one once you factor in what a higher wage lets you stash tax deferred each year.

Basis is the accounting that tracks how much of the company you have already paid tax on, and it controls whether your distributions and losses are tax free or taxable. Get it wrong and you either pay tax you do not owe or claim losses you are not allowed. Your stock basis starts with what you put in, rises by your share of income each year, and falls by distributions and your share of losses. The IRS walks through the order of these adjustments on its S corporations page, and the detail lives in the basis worksheet that ships with the K-1 instructions. Tax-exempt income raises basis too, and nondeductible expenses lower it, which is a pair people routinely forget.

Distributions follow basis. As long as a distribution does not exceed your stock basis, it comes out tax free because you already paid tax on that income when it passed through. Take out more than your basis and the excess becomes a capital gain. That is the trap. An owner who pulls cash faster than the company earns it can create a taxable gain on what feels like their own money. Losses work the mirror image. You can only deduct pass-through losses up to your basis. A loss beyond basis is suspended and carries forward until you have basis again, either from future income or fresh contributions. Form 7203 is now where shareholders track and report stock and debt basis, and the IRS requires it when you claim a loss, receive a distribution, or dispose of stock. Filing it wrong, or not at all, is a fast way to draw a notice.

Debt basis is the wrinkle people miss. If you personally lend money to your S corp, that loan creates debt basis, which can absorb losses after stock basis hits zero. But a loan the company takes from a bank with your personal guarantee does not give you basis, because you did not actually lay out the money. Only a direct loan from you to the corporation counts. The official treatment is on the IRS S corporation stock and debt basis page, and it is worth reading before you assume a guarantee helps you. If you later repay that shareholder loan while debt basis is below the loan’s face amount, part of the repayment can itself be taxable, which catches people off guard.

A worked example. You start with 50,000 dollars of stock basis. The company allocates you 30,000 dollars of income, raising basis to 80,000 dollars. You take a 90,000 dollar distribution. The first 80,000 dollars is tax free, and the last 10,000 dollars is a capital gain. Order matters too, because income is added before distributions are subtracted, which often saves the day and turns what looked like a taxable distribution into a tax free one. We see this every year. Owners take distributions without tracking basis, then their preparer cannot tell whether a distribution was a return of capital or a taxable gain, and the loss deductions get disallowed for lack of substantiation. Keep a basis schedule every single year, not just the years you have a loss. Our corporate returns team maintains it as part of the 1120-S engagement so you are never reconstructing it under audit. Start at our new client inquiry form.

A closing point on why basis tracking is not optional anymore. Before Form 7203 existed, many preparers reconstructed basis only when a loss appeared, and the IRS rarely pushed back. That era is over. The IRS now expects a clean, year-by-year basis schedule attached to the return whenever you take a loss, take a distribution, or sell stock, and missing or sloppy 7203 reporting is an easy automated flag. The schedule also matters enormously at exit. When you sell your S corp stock, your gain is sale price minus basis, so every dollar of basis you failed to track is a dollar you may overpay tax on at the closing table. Sloppy basis records cost owners real money on the way out, not just during the holding period. Treat the annual basis schedule as part of owning the company, the same way you treat the tax return itself.

An S corp usually wins over a sole proprietorship once your net profit is high enough that the payroll tax savings outrun the cost of running payroll and filing a separate return. Below roughly 40,000 to 50,000 dollars of profit the savings are thin and the extra cost and paperwork rarely pencil out. Above that, the gap between paying 15.3 percent self-employment tax on every dollar versus paying it only on a reasonable salary starts to matter. A good s corporations guide will not give you a flat threshold, because it depends on your reasonable salary, your state, and your appetite for compliance work. The IRS overview of the structure sits on the S corporations page, and it is the right starting point before you model your own numbers.

Against a C corporation the calculus is different. A C corp pays a flat 21 percent corporate tax and then shareholders pay again on dividends, the classic double tax. An S corp avoids that second layer entirely. But a C corp can retain earnings at that 21 percent rate, offer a wider range of stock classes and owners, and access certain fringe benefits an S corp cannot give a more-than-2-percent owner tax free. For a company planning to raise venture money or reinvest heavily, the C corp can win despite the double tax, partly because investors often demand it. For a profitable owner-operated business that wants to pull cash out, the S corp almost always wins. The 1120-S is the return that makes the pass-through happen, covered on the About Form 1120-S page, and you elect into it with Form 2553 as described on the About Form 2553 page.

Now the New York wrinkle, because this is where a lot of out-of-state advice falls apart. New York does not automatically honor your federal S election. You have to make a separate New York State S election on Form CT-6 or the state treats you as a C corporation for state purposes, which can saddle you with the corporate franchise tax in a way you did not expect. New York City is harsher still. The city does not recognize S corporation status at all for its General Corporation Tax. Your S corp pays the NYC GCT at the entity level on its city income, so the pass-through benefit you enjoy federally does not carry through to the city. That entity-level city tax can erase a chunk of the savings if you do not plan for it, and it applies on top of any tax you owe personally.

A worked example for a NYC owner. Say your S corp nets 250,000 dollars. Federally you save real payroll tax versus a sole prop, on the order of several thousand dollars a year. But the city GCT applies to the entity, so you owe city tax the structure does not shield you from, and New York State only spares you the franchise tax if you actually filed the state S election. We see this every year. A founder copies a Delaware or Texas playbook, never files the New York S election, and gets a franchise tax bill plus the city GCT they did not budget for. The fix is to run the numbers with the city and state layers included before you elect, not after. Our tax strategy consulting team models the federal, state, and NYC layers together, and our entity formation and structuring team makes sure the state election is actually filed and on time. Start at our new client inquiry form.

One final consideration for New York founders weighing the structure. The choice is not permanent, but reversing it is costly. If you revoke an S election or blow eligibility, you generally cannot re-elect for five years without IRS consent, and you may trigger built-in gains tax on appreciated assets if you later convert from C to S. So the decision deserves a real model, not a rule of thumb from a podcast. We run the full picture, federal payroll tax savings against the NYC General Corporation Tax, the New York State franchise tax, your reasonable salary, your retirement goals, and your exit plans, then put a number on what the S corp actually saves you net of every layer. For many of our city clients the S corp still wins, but only after the city tax is in the model. That is the difference between a structure that looks good on a federal-only spreadsheet and one that holds up against an actual New York tax bill.