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New Hampshire Individual Income Tax Filing deadlines and extensions for 2025.
If you are a resident or have been involved in significant business operations within New Hampshire, then you might be required to file New Hampshire State Taxes. We look at the most important tax deadlines and tax extensions for New Hampshire in 2025.
If your clients are residents or have been involved in significant business operations within New Hampshire, then they might be required to file New Hampshire State Taxes. This guide outlines important tax deadlines and tax extensions for New Hampshire in 2025.
New Hampshire C Corporation Tax Deadlines for 2025
You must file and pay Business Profits Tax in New Hampshire by April 15, 2026.
Extension to File Taxes in New Hampshire for 2025
The Extension Deadline for New Hampshire corporate income tax returns is November 15, 2026.
If you have paid 100% of the BET and BPT determined to be due by April 15, 2026, you will be granted an automatic seven-month extension to file your New Hampshire BET and BPT returns.
This is an extension to FILE, not an extension to PAY – payment is still due April 15, 2026.
New Hampshire Partnership Tax Deadlines for 2025
You must file in New Hampshire by March 15, 2026.
Extension to File Partnership Taxes in New Hampshire for 2025
The Extension Deadline for New Hampshire Partnership tax return is September 15, 2026.
If you have paid 100% of the BET and BPT determined to be due by September 15, 2026, you will be granted an automatic seven-month extension to file your New Hampshire BET and BPT returns.
This is an extension to FILE, not an extension to PAY – payment is still due March 15, 2026.
The State of New Hampshire currently does not have an Individual Income Tax.
New Hampshire imposes the Interest and Dividends Tax on residents who receive interest and dividend income from investments.
The due date for filing and payment is April 15, 2026.
Form DP-10 – New Hampshire Interest & Dividends Tax Return.
Extension to File Taxes in New Hampshire for 2025
If you have paid 100% of the Interest & Dividends tax determined to be due by April 15, 2026, you will be granted an automatic 7-month extension to file your New Hampshire Interest and Dividends tax without filing Form DP-59-A.
This is an extension to FILE, not an extension to PAY – payment is still due March 15, 2026.
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The material discussed on this page is meant for general illustration and/or informational purposes only and is not to be construed as investment, tax, or legal advice. You must exercise your own independent professional judgment, recognizing that advice should not be based on unreasonable factual or legal assumptions or unreasonably rely upon representations of the client or others. Further, any advice you provide in connection with tax return preparation must comply in full with the requirements of IRS Circular 230.
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