Massachusetts Small Business Tax Guide — 2026
Income Tax Rate
5% flat rate + 4% surtax on income over $1M
Sales Tax Rate
6.25%
Filing Deadline
April 15 (matches federal deadline)
Massachusetts Income Tax
Massachusetts imposes a state income tax with rates of 5% flat rate + 4% surtax on income over $1M. Self-employed individuals, freelancers, and sole proprietors pay this tax on their net business income in addition to federal income tax and federal self-employment tax (15.3%).
Self-Employment in Massachusetts
Massachusetts has a 5% flat income tax plus a 4% "millionaire's tax" surtax on income over $1 million (total 9% on income above $1M). No separate state SE tax.
Estimated Tax Requirements
Quarterly estimated payments required if you expect to owe $400 or more. Standard federal due dates apply.
Massachusetts Deductions & Credits
- Massachusetts does not allow many federal deductions
- No standard deduction — uses personal exemption system
- Rent deduction: 50% of rent paid, up to $3,000
- Commuter deduction for public transit costs
Business Filing Fees
LLC: $500 formation + $500 annual report. Corporation: $275 formation + $125 annual report.
Key Facts About Massachusetts Taxes
- Massachusetts has the most expensive LLC costs in the nation ($500 formation + $500/year)
- The 4% "millionaire's tax" surtax on income over $1M took effect in 2023
- No standard deduction — uses a different deduction system than federal
- Rent paid is partially deductible (50%, up to $3,000)
- Estimated payment threshold is low at $400
The Part Massachusetts Does Not Do For You
Whatever Massachusetts takes, it takes on your net profit — and net profit is just what you earned minus what you can prove you spent. The proving is on you, and it is where most of the money leaks out.
TaxTidy is where the proof lives. Photograph a receipt and it reads the vendor, the amount and the date in about three seconds, then files the expense on its Schedule C line. Nothing gets typed in twice, and nothing depends on you remembering a purchase from eight months ago.
Because Massachusetts wants its own return alongside the federal one, the same organized record does double duty — one set of receipts, sorted once, ready for whichever deadline comes first. Your Audit Readiness Score shows you how solid that record is before anyone else asks.
Frequently Asked Questions
What is Massachusetts's tax rate for high-earning freelancers?
Massachusetts charges 5% on all income, plus an additional 4% surtax on income over $1 million (9% total on income above $1M). This "millionaire's tax" applies to all income types including self-employment.
Why are Massachusetts LLCs so expensive?
Massachusetts charges $500 for LLC formation and $500 for the annual report — the highest in the nation. Many Massachusetts freelancers operate as sole proprietors to avoid these fees.
When are Massachusetts estimated taxes due?
Quarterly on April 15, June 15, September 15, and January 15. Required if you expect to owe just $400 or more.
Official source: Massachusetts Department of Revenue
TaxTidy provides expense organization tools based on the most current US tax law available to it. TaxTidy is not a CPA, Enrolled Agent, or licensed tax professional. All categorizations, deductions, and tax calculations are estimates. Please verify all data for accuracy and consult a certified tax professional before filing.
Start Tracking Your Massachusetts Business Expenses
Your first 25 scans are on us — free for life, no card required. Enough to sort this quarter's receipts by Schedule C line and see your Audit Readiness Score for the first time.
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