Massachusetts tax planning for independent workers
Massachusetts taxes most ordinary income, including self-employment profit, at a flat 5% rate. That makes the state line in this comparison straightforward: net profit, minus the state's personal exemption, times 5%. The verified 2026 figures used here are a $4,400 personal exemption for a single or married-separate filer, $8,800 for married filing jointly, and $6,800 for head of household, all subtracted from taxable income before the flat rate is applied.
Since 2023, Massachusetts voters approved an additional 4% "surtax" on taxable income above a threshold that rises each year for inflation - $1,107,750 for the 2026 tax year. Above that level, the effective state rate on the excess is 9% instead of 5%. This tool covers ordinary self-employment income and intentionally does not model the surtax, so a freelancer with very high annual profit should expect a materially higher real Massachusetts bill than this simplified page shows.
The federal portion of the estimate is unchanged from the rest of this tool: it applies the site's existing federal income-tax bracket function and the existing self-employment-tax function to net profit, then adds the Massachusetts result on top. Massachusetts also requires quarterly estimated payments for many self-employed filers, on a schedule similar to the federal due dates.
Use the Massachusetts preselected comparison calculator to see the combined result, then visit the Quarterly Tax Calculator for federal payment planning. The main state comparison lets you compare Massachusetts with the other states in this tool at the same income.
If your income is likely to approach seven figures, the surtax exclusion noted above matters a great deal. Consult a tax professional before relying on this simplified estimate for a filing, relocation, or business-structure decision.