Massachusetts (MA)
April 15, 2026
October 15, 2026
✓ Automatic if 80% Paid
MA — MassachusettsMassachusetts Personal Income Tax Extension — What You Need to Do
Massachusetts grants a 6-month extension to October 15, 2026, but it’s conditioned on payment, not just a form. If you owe $0 additional tax, you’re automatically extended with no form needed. If you owe tax, you must file Form M-4868 and have paid at least 80% of your total tax liability by April 15, 2026 for the extension to be valid — Massachusetts’s threshold is stricter than the 90% rule used by several other states.
Massachusetts Extension Checklist — 2026
Two things to handle. Whether you need Form M-4868 depends on whether you owe tax.
April 15, 2026
Pay At Least 80% of Your Massachusetts Tax (File Form M-4868 If So)
Check with Form M-4868 Mass. DOR
PO Box 419540
Boston, MA 02241-9540
Payments of $5,000+ must be made electronically, or a $100 penalty applies.
October 15, 2026
File Federal + Massachusetts Return
File your federal return now and add your Massachusetts state return — Form 1 — in the same session. Filing sooner means a faster refund. Your Massachusetts extended deadline is October 15.
Start Federal + Massachusetts Return →
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Massachusetts Late Filing & Payment Penalties — What It Costs to Wait
Falling short of the 80% threshold doesn’t just add a penalty — it can void your extension entirely, making your return late from April 15, not October 15.
| Charge Type | Rate | Cap | Trigger |
|---|---|---|---|
| Late Filing Penalty | 1% of tax due per month (or fraction) | 25% | Return filed late without a valid extension (extension is void if the 80% rule isn’t met) |
| Late Payment Penalty | 1% of tax due per month (or fraction) | 25% | Tax unpaid after April 15, 2026 |
| Interest | 8% per year (Q3 2026; adjusted quarterly) | No cap | Accrues from April 15 on any unpaid balance |
Massachusetts State Extension Details
| Extension Type | Automatic — Conditioned on 80% Payment or $0 Tax Due |
| Original Filing Deadline | April 15, 2026 |
| Extended Filing Deadline | October 15, 2026 |
| Extension Period | 6 months |
| Extension Form | Form M-4868 — required unless $0 additional tax is due |
| Return Form | Form 1 (resident) / Form 1-NR/PY (nonresident & part-year resident) |
| Federal Extension Required? | No — Massachusetts’s extension is independent of federal extension status |
| Payment Deadline | April 15, 2026 (extension does not extend time to pay) |
| The 80% Rule | Pay at least 80% of total tax liability by April 15, 2026 (withholding, estimates, and credits count) — falling short voids the extension itself, not just triggers a penalty |
| Online Payment Portal | MassTaxConnect |
| Return Mailing Address (refund) | Mass. DOR, PO Box 7000, Boston, MA 02204 |
| Return Mailing Address (payment enclosed) | Mass. DOR, PO Box 7003, Boston, MA 02204 |
| Extension Payment Mailing Address | Mass. DOR, PO Box 419540, Boston, MA 02241-9540 |
| State Agency | Massachusetts Department of Revenue |
| Late Filing / Late Payment Penalty | 1% per month each, up to 25% each |
| Interest Rate | 8% per year (Q3 2026, federal short-term rate + 4 points, adjusted quarterly) |
Massachusetts Tax Extension — Frequently Asked Questions
Do I need to file Form M-4868?
Only if you owe additional Massachusetts tax. If your return shows $0 due, the extension is automatic with no form required.
What happens if I don’t pay 80% by April 15?
Your extension becomes invalid — you’re treated as if you never requested one. That means your return is late from April 15 forward, exposing you to the full late-filing penalty in addition to late-payment penalties and interest.
Does a federal extension cover Massachusetts?
No. Massachusetts’s extension is entirely independent of federal extension status — it’s governed solely by Form M-4868 and the 80% payment rule.
What if I’m due a refund?
If you’re due a refund, there’s no tax owed, so your extension is automatic with no form needed. You’ll still want to file as soon as possible to get your refund.
Is the interest rate fixed all year?
No. Massachusetts recalculates its interest rate quarterly, based on the federal short-term rate plus four percentage points, compounded daily.
Which Massachusetts return form do I need?
Form 1 is for full-year residents. Nonresidents and part-year residents file Form 1-NR/PY.
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