Self-employment tax · Massachusetts · 2026
Massachusetts self-employment
tax calculator (2026).
Massachusetts taxes income at a flat 5% in 2026. Enter your net business income to estimate your self-employment tax, federal income tax, Massachusetts income tax, and the quarterly payment that keeps you out of penalty range — built for self-employed service vendors on Schedule C.
Estimate only — not tax, legal, or financial advice, and provided with no warranty of accuracy. Figures are approximations of 2026 federal + state self-employment tax and exclude credits, dependents, other deductions, retirement contributions, and QBI phaseouts above $191,950 single / $383,900 married, among other factors. Verify with a licensed tax professional before relying on these numbers.
How Massachusetts taxes you
Massachusetts taxes income at a flat 5% in 2026.
Flat 5% up to $1,083,150; income above that carries a 4% surtax (9% total) — rarely relevant at self-employment income levels.
State brackets verified 2026-06-14 against the Tax Foundation’s 2026 tables and cross-checked. Federal self-employment tax is 15.3% of 92.35% of net income everywhere; only the state portion changes by location.
Worked example
$80,000 net income, single filer.
Estimate only — it excludes credits, dependents, retirement contributions, and QBI phaseouts. Talk to a CPA before you send the IRS a check this size. Plan your quarterly payments →
Massachusetts tax FAQ
Common questions.
- Does Massachusetts tax self-employment income in 2026? Yes. Massachusetts taxes income at a flat 5% in 2026, on top of federal self-employment tax (15.3%) and federal income tax.
- How much should I set aside for taxes on $80,000 of net income in Massachusetts? On $80,000 of net self-employment income (single filer), the estimate is about $11,304 self-employment tax, $5,099 federal income tax, and $3,717 Massachusetts income tax — roughly $20,120 total, or about $5,030 per quarter (~25.15% effective). Adjust for your deductions and credits.
- When are quarterly estimated taxes due? Federal estimated payments are generally due April 15, June 15, September 15, and January 15. The safe-harbor minimum is 100% of last year's tax (110% if your AGI was over $150,000) — pay that across four quarters and you avoid the underpayment penalty regardless of how your income spikes.
- Is a deposit I collect through BookNox taxable? Yes — a deposit is income in the year you receive it, the same as any other booking revenue. BookNox uses Stripe Connect direct charges, so the money lands in your own bank account and you report it like any self-employment income.
Book the work. Then handle the tax.
The same tax dollar hits whether you book the client this week or next month. BookNox helps Massachusetts service vendors close inquiries on the spot — quote, sign, and take the deposit in one link, $29/month flat.