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Massachusetts Business State Tax Extension I LLCs / Partnerships Filing Guide

Form M-63D-EXT | Entity-Level Tax Extension Payment  ·  LLCs / Partnerships  ·  Business Filing Guide

Overview

Massachusetts LLCs and partnerships are subject to state tax filing requirements, administered by the Massachusetts Department of Revenue. Massachusetts grants an automatic extension tied to an approved IRS extension, making the process simple for businesses that have already filed IRS Form 7004.

Original Filing Deadline

• The original due date for the Massachusetts LLCs / Partnerships return is March 16, 2026. File or remit full payment by this date to remain in good standing.
• Extension Period & Extended Deadline
• Massachusetts automatically grants an extension to file, provided you have obtained an approved federal extension from the IRS by filing IRS Form 7004. With a valid IRS extension, the Massachusetts extended deadline becomes September 15, 2026. No separate state extension form is required—the federal extension serves as your Massachusetts extension.

Payment Is Still Due by Original Deadline

The extension applies to filing only—it is not an extension to pay taxes owed. Any outstanding tax liability must be paid by the original due date of March 16, 2026 to avoid penalties and interest. Use the Massachusetts | Online Tax Extension Payment to pay electronically. For mail-in payments, use Form M-63D-EXT | Entity-Level Tax Extension Payment and send to: Massachusetts Department of Revenue P.O. Box 7025 Boston, MA 02204

Late Filing and Payment Penalties

• Failure to File: 1% of the tax required to be shown on the return for each month or part of a month during which the failure continues, up to 25% in the aggregate.
• Failure to Pay: 1% of the tax required to be shown on the return for each month or part of a month during which the failure continues, up to 25% in the aggregate.

Best Practices

• Estimate and pay your Massachusetts business tax by March 16, 2026 to avoid interest and penalties.
• File IRS Form 7004 with the IRS to secure your federal extension, which Massachusetts automatically honors.
• Use the state online payment portal for fast, convenient electronic payment.
• Set a reminder to file your completed Massachusetts LLCs / Partnerships return by September 15, 2026.

Final Thoughts

• Massachusetts’s business tax extension is straightforward once your federal extension is approved. Pay 100% of any tax due by March 16, 2026 and file your LLCs / Partnerships return by September 15, 2026.
• Quick Reference Table
• State Abbreviation
• MA
• State Name
• Massachusetts
• Business Entity Type
• LLCs / Partnerships
• Extension Status
• Approved with Federal
• Return Due Date
• March 16, 2026
• Extended Due Date
• September 15, 2026
• Other Information
• Massachusetts grants your business an automatic 6-month extension provided you have obtained an approved IRS extension. The extension is NOT an extension to pay any taxes you may have due. Tax payments are due by the original return due date. Businesses operating as a corporation should pay more than 50% of the total amount of tax due or the minimum corporate excise by the original due date for filing the return. Businesses operating as an LLC, fiduciary, or partnership should pay more than 80% of the total amount of tax due by the original due date for filing the return.
• Online Payment
• Massachusetts | Online Tax Extension Payment
• Payment Voucher Form
• Form M-63D-EXT | Entity-Level Tax Extension Payment
• State Payment Agency
• Massachusetts Department of Revenue
• Mailing Address with Payment
• Massachusetts Department of Revenue P.O. Box 7025 Boston, MA 02204
• Failure to File Penalties
• 1% of the tax required to be shown on the return for each month or part of a month during which the failure continues, up to 25% in the aggregate.
• Failure to Pay Penalties
• 1% of the tax required to be shown on the return for each month or part of a month during which the failure continues, up to 25% in the aggregate.

Working with a Tax Professional

Business tax returns are complex—a licensed CPA or Enrolled Agent can maximize deductions, ensure accurate calculations, and handle filing on your behalf. Here's how working with a TaxPro typically goes:

1. 1Get matched with a verified U.S.-based CPA or Enrolled Agent
2. 2Upload your business documents via secure drag-and-drop
3. 3Review and approve your return with upfront, transparent fees
4. 4Your TaxPro files your Massachusetts return by September 15, 2026

Quick Reference Table

State Abbreviation	MA
State Name	Massachusetts
Business Entity Type	LLCs / Partnerships
Extension Status	Approved with Federal
Return Due Date	March 16, 2026
Extended Due Date	September 15, 2026
Other Information	Massachusetts grants your business an automatic 6-month extension provided you have obtained an approved IRS extension. The extension is NOT an extension to pay any taxes you may have due. Tax payments are due by the original return due date. Businesses operating as a corporation should pay more than 50% of the total amount of tax due or the minimum corporate excise by the original due date for filing the return. Businesses operating as an LLC, fiduciary, or partnership should pay more than 80% of the total amount of tax due by the original due date for filing the return.
Online Payment	Massachusetts | Online Tax Extension Payment
Payment Voucher Form	Form M-63D-EXT | Entity-Level Tax Extension Payment
State Payment Agency	Massachusetts Department of Revenue
Mailing Address with Payment	Massachusetts Department of Revenue P.O. Box 7025 Boston, MA 02204
Failure to File Penalties	1% of the tax required to be shown on the return for each month or part of a month during which the failure continues, up to 25% in the aggregate.
Failure to Pay Penalties	1% of the tax required to be shown on the return for each month or part of a month during which the failure continues, up to 25% in the aggregate.