Massachusetts Self-Employment Tax Calculator (2026)
Federal self-employment tax, federal income tax and Massachusetts state income tax on 1099 income, plus the quarterly estimated payment to set aside.
- Total tax
- $18,083
- Effective rate
- 25.1%
- Per quarter
- $4,521
- After-tax income
- $53,917
| Breakdown | |
|---|---|
| Net profit (income − expenses) | $72,000 |
| Self-employment tax | $10,173 |
| Social Security (12.4%) | $8,245 |
| Medicare (2.9%) | $1,928 |
| Federal income tax | $4,630 |
| Adjusted gross income | $66,913 |
| Standard deduction | −$16,100 |
| Qualified business income deduction (20%) | −$10,163 |
| Taxable income · marginal rate 12.0% | $40,651 |
| Massachusetts income tax | $3,280 |
| Total federal + state | $18,083 |
Estimated payments of $4,521 are due Apr 15, 2026, Jun 15, 2026, Sep 15, 2026, Jan 15, 2027.
How the 2026 numbers are calculated
- Net profit is your 1099 income minus deductible business expenses (Schedule C).
- Self-employment tax is 15.3% of 92.35% of net profit: 12.4% Social Security on the first $184,500 of combined wages and net earnings, plus 2.9% Medicare on all of it. An extra 0.9% Medicare tax applies above $200,000 ($250,000 married filing jointly).
- Adjusted gross income is net profit plus any W-2 wages, minus half of the self-employment tax.
- The standard deduction ($16,100 single, $32,200 married filing jointly, $24,150 head of household) and the 20% qualified business income deduction reduce taxable income. The QBI deduction starts phasing out above $201,750 of taxable income ($403,500 joint).
- Federal income tax is applied to what is left using the 2026 brackets for your filing status.
- The child tax credit ($2,200 per child under 17, $500 per other dependent) reduces income tax; up to $1,700 per child is refundable and can offset self-employment tax.
- The earned income credit for filers with children — up to $4,427 with one child, $7,316 with two, $8,231 with three or more — is fully refundable and phases out above $23,890 of income ($31,160 joint).
- Massachusetts income tax: calculated under the state's own rules, described below.
Massachusetts and self-employment income
Massachusetts taxes self-employment income at a flat 5%, plus a 4% surtax on taxable income over about $1.1 million. There is no standard deduction; instead each filer gets a personal exemption ($4,400 single, $8,800 joint, $6,800 head of household) and $1,000 per dependent, and self-employment tax paid is deductible up to $2,000. Massachusetts does not use the federal deduction for half of self-employment tax or the 20% QBI deduction. Very low incomes owe nothing under No Tax Status ($8,000 single; $14,400 head of household and $16,400 joint, each plus $1,000 per dependent), and the Limited Income Credit keeps the tax small just above that line.
Massachusetts rules used by this calculator (2026)
- Massachusetts applies a flat 5% rate for 2026, plus a 4% surtax on taxable income over $1,107,750.
- There is no standard deduction.
- Each filer gets a personal exemption that depends on income.
- Each dependent adds a $1,000 deduction.
- Self-employment tax paid is deductible up to $2,000 per person; the federal deduction for half of it is not used.
- No tax is due at or below $8,000 of income single ($16,400 joint, plus $1,000 per dependent), and just above it the tax is capped at 10% of the income over the line (the limited income credit).
- Massachusetts's earned income credit is 40% of the federal credit, refundable; the calculator applies it.
- A refundable $440 credit per child under 13; the calculator applies it.
- No Massachusetts tax is due when income is $8,001 or less ($16,401 joint) before exemptions.
- Massachusetts does not allow the federal deduction for half of self-employment tax; state tax applies to net profit before that deduction.
- Massachusetts has no city or county income taxes.
What a Massachusetts freelancer may still owe
- Massachusetts requires estimated payments (Form 1-ES) when you expect to owe more than $400.
- There is no city or county income tax. Applied here: the Massachusetts EITC (40% of the federal credit, refundable) and the refundable child and family tax credit ($440 per dependent under 13 — enter your children under 13 above); neither is available to married filing separately.
Quarterly estimated tax deadlines (2026)
If you expect to owe $1,000 or more of federal tax for the year, the IRS expects four estimated payments (Form 1040-ES). Massachusetts runs its own estimated-payment schedule with its own threshold (see above); the calculator's per-quarter figure combines federal and state so you can set aside one amount.
- Federal payment 1: April 15, 2026
- Federal payment 2: June 15, 2026
- Federal payment 3: September 15, 2026
- Federal payment 4: January 15, 2027
The calculator splits your total into four equal payments. To avoid an underpayment penalty you can instead pay 100% of last year's total tax (110% if your prior-year AGI was over $150,000) spread across the four dates.
Common questions
Does Massachusetts tax self-employment income differently from wages?
For state income tax, net profit from self-employment is ordinary income like wages. The self-employment tax itself is federal only; Massachusetts does not add a state equivalent.
Is half of self-employment tax really deductible?
Yes, for federal tax. The employer-equivalent half is an adjustment to income on Schedule 1, which lowers your AGI and therefore your federal income tax. It does not reduce the self-employment tax itself. Massachusetts does not allow this deduction for state tax.
Does an LLC change these numbers?
A single-member LLC taxed as a sole proprietorship pays exactly what this calculator shows. Electing S-corporation status changes the math (salary plus distributions) and is outside this tool's scope.
What if I moved to Massachusetts during the year?
Income earned while you were a resident of another state is taxable there under that state's rules. This calculator assumes all income was earned as a Massachusetts resident.
Data sources and status
Federal figures for 2026: verified · last verified 2026-09-05
- IRS Rev. Proc. 2025-32 (2026 inflation adjustments, incorporating OBBBA changes)
- SSA 2026 COLA fact sheet — Social Security wage base
- 26 U.S.C. §199A as amended by Public Law 119-21 — QBI phase-in range widened to $75,000 / $150,000
- 26 U.S.C. §24 as amended by Public Law 119-21 — CTC $2,200, indexed from 2026
- IRS Form 1040-ES (2026) — estimated tax due dates
- IRS Rev. Proc. 2025-32 §4.06 — earned income credit amounts and §32(i) investment income limit
- IRC §6654(d)(1)(B)–(C), (e)(1) and (f) (required annual payment: lesser of 90% of the current year's tax or 100% of the prior year's, 110% when prior-year AGI exceeds $150,000 / $75,000 MFS; no penalty when the tax less withholding is under $1,000; 'tax' = income tax + SE tax less credits other than withholding), read at law.cornell.edu; Form 1040-ES instructions, 'Who Must Pay Estimated Tax' and the Estimated Tax Worksheet
Massachusetts figures for 2026: verified · last verified 2026-09-08
- Massachusetts Department of Revenue — 2026 Form 1-ES instructions (Wayback copy): 5% rate and the 4% surtax on taxable income over $1,107,750 for 2026; DOR tax rates page (updated 2025-12-30) with the same 2026 threshold
- Massachusetts Department of Revenue — 2025 Form 1 instructions for every unindexed amount (exemptions, dependents, the $2,000 line 11 cap, No Tax Status and Limited Income Credit thresholds), none of which the statute indexes; TIR 26-4 (2026-06-23) confirming non-conformity to the 2025 federal QBI, tips and overtime provisions (St. 2026 c.101)
- M.G.L. c.62 §3 (exemptions) and §2(d)(1)(Q) via TIR 23-1; the rate section §4 was not read directly
- Massachusetts Department of Revenue — 2025 Form 1 instructions, line 43 (earned income credit: 40% of the federal credit on Form 1040 line 27a, refundable) and line 46 (child and family tax credit: $440 per dependent under 13, or 65+ / disabled, no phase-out, no cap, refundable; not for married filing separately); M.G.L. c.62 §6(h) and §6(x)