How to Complete New York Form IT-370-PF: Filing, Payment, and Penalties

New York Form IT-370-PF gives partnerships, LLCs taxed as partnerships, and fiduciaries of estates or trusts an automatic extension of time to file their New York State income tax returns. File it with the Department of Taxation and Finance on or before the original return due date, pay any tax owed with it, and the state pushes your filing deadline back with no approval needed.¹ A federal Form 7004 does not substitute for it. If you filed a federal extension and skipped the state form, New York treats the return as late.

Who Files IT-370-PF

The form covers two groups, each extending a different return.

Partnerships filing Form IT-204. This includes any partnership with a resident partner or New York source income, plus LLCs, LLICs, LLTCs, and LLPs treated as partnerships for federal tax purposes. Each entity files its own IT-370-PF.²
Fiduciaries filing Form IT-205 on behalf of a New York estate or trust. Again, each estate or trust needs its own separate form.¹

Deadlines and How Long the Extension Lasts

The original due date and the length of the extension depend on which return you’re extending.

For a calendar-year partnership, Form IT-204 is due March 15. Because March 15, 2026 falls on a Sunday, the deadline shifts to March 16, 2026. Filing IT-370-PF grants a six-month extension, moving the filing deadline to September 15, 2026.³

For a calendar-year estate or trust, Form IT-205 is due April 15, 2026. Filing IT-370-PF grants a five-and-a-half-month extension, moving the deadline to September 30, 2026.¹

Fiscal-year filers use the 15th day of the third month (partnerships) or the fourth month (estates and trusts) after the close of the fiscal year, and enter the beginning and ending dates of that year in the boxes on the form.² The extension applies only to filing. It does not extend the time to pay.

Filling Out the Form

Identification

Enter the entity’s federal Employer Identification Number and its legal name and address. For estates and trusts, the EIN and name must match the federal Form SS-4 used to obtain the number, followed by the fiduciary’s or firm’s address.¹ Mismatches between the EIN and the name on file are one of the fastest ways to delay processing. Calendar-year filers can leave the fiscal-year date boxes blank.

Tax Calculation and Payment

Fiduciaries filing IT-205 must estimate the tax due for the year and calculate a balance. The form’s worksheet walks through it: estimate the total income tax owed by the estate or trust for the year, subtract estimated tax payments already made, withholding, and any credits applied to the account, and send the remaining balance with the extension to avoid interest.²

Partnerships filing IT-204 generally do not owe entity-level income tax because income flows through to the partners. But if the partnership has New York source income and nonresident partners, it has a separate estimated tax obligation, addressed below.

Nonresident Partner Estimated Tax

Partnerships with New York source income must make estimated tax payments on behalf of partners who are nonresident individuals or C corporations. Individual-partner payments are reported on Form IT-2658; corporate-partner payments on Form CT-2658. The requirement covers all partnerships and LLCs or LLPs treated as partnerships, except publicly traded partnerships.³

When you file IT-370-PF for a partnership, include any amount owed under these nonresident partner rules in what you remit. Underpayment carries its own penalty under Tax Law Section 685, calculated on Form IT-2659, and it compounds quickly across many nonresident partners.

How to Submit the Form

Electronic Filing

The New York State Online Services portal is the primary way to file IT-370-PF, and you can pay directly from a bank account or by credit card when you file.⁴ E-filing produces an immediate confirmation receipt. Save it.

Preparers who handled documents for more than 10 different taxpayers in the prior calendar year and use tax software fall under New York’s e-file mandate, which explicitly covers extensions.⁵ Your accountant likely cannot paper-file this form on your behalf.

Paper Filing

A paper envelope must be postmarked by the original due date. The address depends on whether you’re sending a payment:

With payment: EXTENSION REQUEST, PO BOX 4125, BINGHAMTON NY 13902-4125
Without payment: EXTENSION REQUEST—NR, PO BOX 4126, BINGHAMTON NY 13902-4126¹

Make checks or money orders payable to “New York State Income Tax” and write the entity’s EIN on the payment so the state can match it to the account.

Interest on Unpaid Tax

An extension to file is not an extension to pay. If the estate or trust owes tax and you don’t pay it in full by the original due date, interest runs from that date until you pay, regardless of the extension.⁶ The rate is set quarterly. For the first quarter of 2026, the income tax underpayment rate is 9.5%.⁷ Interest compounds daily, so check the Department’s site for the current figure when you file.

Penalties If You Don’t File the Extension

Penalties differ by return type, and they add up fast.

Partnerships

A partnership that files IT-204 late without an extension owes $50 multiplied by the total number of partners subject to New York personal income tax during any part of the tax year, for each month or partial month the return is late, capped at five months.⁸ A 20-partner firm three months late owes $3,000 in penalties before interest. The penalty can be waived on a showing of reasonable cause and no willful neglect.

Estates and Trusts

A fiduciary that files IT-205 late without an extension owes 5% of the tax due for each month or partial month the return is overdue, capped at 25%.¹ On a $20,000 liability, that tops out at $5,000. Filing IT-370-PF on time and paying what you owe by the original deadline eliminates this penalty entirely.

After You File

New York does not send an approval notice for automatic extensions. The extension takes effect the moment the form is filed on time. Keep a copy of the completed form and, if you e-filed, the electronic confirmation receipt. That receipt is your proof of timely filing if the state later questions it.

Use the added months to finalize K-1 allocations for partners or beneficiaries, resolve valuation questions in the estate, and reconcile New York source income. The return you eventually file should reflect the entity’s final numbers, not the estimates on IT-370-PF. If you overpaid with the extension, the excess is applied as a credit or refund when the return is processed.

1
New York State Department of Taxation and Finance. Instructions for Form IT-370-PF Application for Automatic Extension of Time to File for Partnerships and Fiduciaries
2
New York State Department of Taxation and Finance. Instructions for Form IT-370-PF Application for Automatic Extension of Time to File for Partnerships and Fiduciaries
3
New York State Department of Taxation and Finance. Instructions for Form IT-204 Partnership Return Tax Year 2025
4
New York State Department of Taxation and Finance. Make a Payment When You Have an Extension of Time to File
5
New York State Department of Taxation and Finance. Tax Return Preparer E-File Mandate
6
New York State Senate. New York Code 684 – Interest on Underpayment
7
New York State Department of Taxation and Finance. Interest Rates: 1/01/2026-3/31/2026
8
New York State Department of Taxation and Finance. New York State Filing Requirements for Certain Partnerships