New York S-Corp Pitfalls: The CT-6 Trap, NYC's 8.85% GCT, and the 2026 PTET Math

A theoretical Brooklyn web developer nets $200,000 through her single-member LLC. She files federal Form 2553 and assumes the S-Corp conversion is done. It is not. New York wants its own election, and if she misses it the state taxes her corporation as a C-Corp while she pays personal tax on the same income. Even with both elections in, New York City does not recognize S-Corp status at all. The developer is theoretical, not an EntityIQ client, but these traps catch federal-only filers every year.

New York wants its own election

Most states piggyback on the federal S election. New York does not. Under Tax Law §660(a), shareholders must make a separate New York S election by filing Form CT-6 with the Department of Taxation and Finance. The deadline mirrors the federal one: on or before the 15th day of the third month of the tax year the election is to take effect. For a calendar-year business that means March 15.

There is one exception under Tax Law §660(i): if the corporation's investment income is more than 50% of its federal gross income for the year, shareholders are deemed to have made the New York S election whether they filed a CT-6 or not. For an operating business, nothing is automatic. No CT-6, no New York S-Corp.

The forgotten CT-6 is expensive

What happens if I forget to file Form CT-6? The corporation stays a New York C-Corp under Article 9-A and pays franchise tax on its business income at the regular corporate rate, currently 6.5% for most taxpayers. Meanwhile the income still flows through to you federally, and as a New York resident you pay state personal income tax on the same dollars. That is two layers of New York tax on one stream of income. TSB-M-98(4)C explains the Tax Law provisions that let the Tax Department treat a late New York S election as timely when there was reasonable cause for the failure, and relief is routinely granted when the CT-6 was simply overlooked. But you have to ask, much like a late federal election under Rev. Proc. 2013-30.

What the state itself charges: not much

Once the CT-6 is in, New York State is one of the cheaper places to run an S-Corp. A New York S-Corp files Form CT-3-S and pays only the fixed dollar minimum tax, which is keyed to New York receipts. The fixed dollar minimum runs from $25 for receipts of $100,000 or less to $4,500 for receipts over $25 million. A consulting firm with $320,000 of receipts pays $175. Compare that to the California stack of a 1.5% net income tax and an $800 floor, and New York State looks almost friendly. For tax years beginning on or after January 1, 2026, the estimated tax threshold also rose to $5,000, above the highest fixed dollar minimum, so New York S-Corps no longer make corporate estimated payments at all.

Then there is the city

Does New York City recognize S-Corp status? No. New York City does not recognize federal or New York State S elections. An S-Corp doing business in the five boroughs pays the General Corporation Tax at 8.85% of net income allocated to the city, computed on Form NYC-4S or NYC-3L. The GCT also carries alternative bases, including one built on 15% of net income plus compensation paid to anyone owning more than 5% of the stock, so you cannot zero out the tax by paying yourself an enormous salary.

A sole proprietorship or partnership in the city pays the Unincorporated Business Tax at 4% instead. Converting a Manhattan sole proprietorship to an S-Corp therefore swaps a 4% city tax for an 8.85% city tax. The math can still work, because your W-2 salary is deductible against the GCT base while the UBT gives you essentially no deduction for your own labor. But the city layer takes a real bite out of the federal payroll savings.

Same business, three addresses, 2026 math

The visual below runs a theoretical $200,000-profit web development business with $320,000 of receipts and a $90,000 owner salary through three setups. The SE tax uses the 2026 Social Security wage base of $184,500, the UBT is shown at a flat 4% before its small statutory allowances, everything is rounded and simplified, and the owner has no other W-2 income.

Outside the five boroughs, the owner keeps nearly all of the roughly $14,500 of federal payroll savings, because the state charges $175 and nothing else. Inside the city, the GCT claws back about $9,700, and the election still wins only because the UBT goes away. Shrink the profit to $90,000 and that spread, net of payroll fees and an extra return, gets thin fast.

The PTET layer

How do I elect the New York PTET? The election is annual and must be made by March 15 of the year it covers, online through the entity's Business Online Services account. An authorized person at the company must log in and opt in; your accountant cannot click the button for you. The tax starts at 6.85% on pass-through entity taxable income up to $2 million, with marginal rates stepping up to 9.65%, then 10.30%, and topping out at 10.90% above $25 million, per TSB-M-21(1)C. Shareholders claim a corresponding credit on Form IT-653 with their personal returns, and the entity deducts the payment federally under IRS Notice 2020-75, which routes around the SALT cap in IRC §164(b)(6). The mechanics are covered in the PTET deduction post.

S-Corps come in two flavors here. An electing standard S corporation computes the PTET only on New York-source income. An electing resident S corporation, one that certifies by March 15 that every shareholder is a New York resident, computes it on all income regardless of where it was earned. For a resident owner, that certification usually means a much larger entity-level deduction.

The city has its own version. The NYC PTET is a flat 3.876%, available to an S-Corp only if every shareholder is a city resident for the full year and the entity has also opted into the state PTET. It offsets the owners' city personal income tax, not the GCT, which the corporation owes either way.

When the New York election wins

Outside New York City, the election is close to a pure federal play: the state costs a few hundred dollars a year, so the decision mostly comes down to profit level, reasonable salary, and whether outside W-2 wages have already used up the $184,500 Social Security wage base. Inside the city, run the GCT against the UBT you already pay before you commit. Either way, calendar the two dates federal-only checklists miss: the CT-6 by the 15th day of the third month, and the PTET opt-in by March 15. The EntityIQ calculator runs the federal, state, and PTET layers together, and the deadline guide covers the federal timing.

This article is educational and is not legal or tax advice. The numbers above are 2026 figures, the scenarios are theoretical, and real outcomes turn on residency, allocation, reasonable compensation, and city sourcing. Please consult a qualified CPA or EA before electing S-Corp status in New York.