North Dakota Personal Tax Extension | Form ND-1EXT | Individual Extension Payment Voucher

Modified on Sat, 13 Jun at 11:52 AM

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North Dakota Personal Tax Extension Guide

Form ND-1EXT · Individual Income Tax · Personal Filing Guide

Your Filing Status

You've Been Extended

Your North Dakota return is extended to October 15, 2026. File now to get your refund faster.

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North Dakota's Extension Tied to Federal Approval

North Dakota grants an automatic six-month extension for filing personal income tax returns to taxpayers who have been approved for a federal extension by the IRS. The Office of State Tax Commissioner aligns with the federal timeline, moving the state filing deadline from April 15, 2026, to October 15, 2026. No separate North Dakota extension form is required to request the extension.

Important: Check the Extension Box on Form ND-1

When you file your North Dakota tax return (Form ND-1), you must check the box next to "Extension" in Section E of the return to certify your extension. Failing to check this box could cause processing complications, even if your federal extension was properly filed.

Payment Is Still Due by April 15

North Dakota's extension applies to filing only—not to paying taxes. Any North Dakota income tax owed must be paid by April 15, 2026, to avoid penalties and interest.

How to Make Extension Payments

ACH Debit (Free): Use the North Dakota TAP portal at apps.nd.gov/tax/tap. An electronic payment authorizes the tax department to debit your checking or savings account. No fee.
Credit/Debit Card: Also available through the TAP portal. A non-refundable convenience fee applies.
Mail: Use Form ND-1EXT and mail to: Office of State Tax Commissioner, P.O. Box 5622, Bismarck, ND 58506-5622.

Late Filing and Payment Penalties

North Dakota's failure-to-file penalty is the greater of $5 or 5% of unpaid tax per month, up to 25%. The failure-to-pay penalty is a flat 5% of unpaid tax. Use TAP for fee-free ACH payments and file by October 15 to avoid both.

Best Practices

File IRS Form 4868 to secure your federal extension.
Pay ND income tax owed by April 15, 2026, using ACH debit (free) at apps.nd.gov/tax/tap.
Check the "Extension" box in Section E of Form ND-1 when you file your return.
File your return by October 15, 2026.

Final Thoughts

North Dakota's extension is automatic with a federal extension. Pay by April 15, check the Extension box on Form ND-1, and file your return by October 15, 2026. Use the TAP portal for fee-free ACH payments.

Quick Reference Table

State Abbreviation	ND
State Name	North Dakota
Extension Status	Approved with Federal Extension
Return Due Date	April 15, 2026
Extended Due Date	October 15, 2026
Other Information	Automatic 6-month extension with IRS approval. Check the "Extension" box in Section E of Form ND-1 when filing your return. Any taxes owed must be paid by April 15 to avoid penalties.
Online Payment	North Dakota \| Online Tax Extension Payment
Payment Voucher Title	Form ND-1EXT \| Extension Payment Voucher
State Payment Agency	Office of State Tax Commissioner
Mailing Address with Payment	Office of State Tax Commissioner P.O. Box 5622 Bismarck, ND 58506-5622
Online Payment Options \| Credit Card	TAP at apps.nd.gov/tax/tap. Non-refundable convenience fee applies.
Online Payment Options \| ACH Debit	TAP at apps.nd.gov/tax/tap. Free ACH debit — no fee.
Failure to File Penalties	Greater of $5 or 5% of unpaid tax per month, up to 25%.
Failure to Pay Penalties	5% of unpaid tax (flat).

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