North Dakota Personal Income Tax Extension – Federal Extension Required
North Dakota grants an automatic six-month extension for filing personal income tax returns to taxpayers who have secured a federal extension through IRS Form 4868. The North Dakota Office of State Tax Commissioner aligns with the federal timeline, extending the filing deadline from April 15, 2026, to October 15, 2026. No separate North Dakota form is needed to request the extension – but when you file your return, you must check the “Extension” box on Form ND-1. Any ND tax owed remains due April 15.
Check the Extension Box When Filing
Section E of Form ND-1 – Required Step
When filing your North Dakota return by October 15, check the “Extension” box in Section E of Form ND-1. Skipping this box can cause processing problems even with a valid federal extension on file.
Flat 5% Payment Penalty
Pay Any Balance by April 15 to Avoid Penalties
North Dakota’s extension covers filing only. The failure-to-pay penalty is a flat 5% of unpaid tax – in addition to the filing penalty – if the balance isn’t paid by April 15. Use TAP’s free ACH option to pay at no cost.
File IRS Form 4868 first: North Dakota’s extension is tied to federal approval. Pay any ND balance by April 15, 2026, and check the Extension box in Section E of Form ND-1 when filing by October 15.
Using Form ND-1EXT
Form ND-1EXT (Individual Extension Payment Voucher) is the North Dakota payment voucher for mailing an extension payment. Online payments are made through the TAP (Taxpayer Access Point) portal at apps.nd.gov/tax/tap – ACH debit is free, while credit and debit card payments carry a non-refundable convenience fee.
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. Both can apply simultaneously if you miss both deadlines – pay by April 15 and file by October 15 to eliminate both.
Best Practices
- ✓File IRS Form 4868 by April 15 – North Dakota’s extension requires federal approval.
- ✓Pay any ND balance by April 15, 2026, using free ACH at TAP (apps.nd.gov/tax/tap).
- ✓Check the “Extension” box in Section E of Form ND-1 when filing your return by October 15.
- ✓File your completed North Dakota return by October 15, 2026.
North Dakota’s extension is clear-cut – federal extension, pay by April 15, check the box on ND-1, and file by October 15, 2026. Use TAP’s free ACH option to avoid any processor fees.
Quick Reference Table
North Dakota State Tax Extension
