Estimate your quarterly taxes as a self-employed worker in Cambridge for 2026, including self-employment tax, federal income tax, and Massachusetts state income tax.
Last updated: May 2026 · Data: MIT Living Wage Calculator, C2ER, U.S. Census, BLS, IRS, state and city sources
Cambridge freelancers pay federal self-employment tax, federal income tax, and Massachusetts state income tax (5% to 9%). Massachusetts has a flat 5% income tax rate with a 4% surtax on income over $1 million (the 'millionaire tax' approved by voters in 2022). The state has one of the highest LLC filing fees in the nation.
| Tax Component | Rate / Detail (2026) |
|---|---|
| Self-Employment Tax | 15.3% on 92.35% of net profit |
| Social Security portion | 12.4% on first $176,100 |
| Medicare portion | 2.9% (no cap) |
| SE Tax Deduction | Deduct half of SE tax from income |
| Federal Standard Deduction (Single) | $15,000 |
| Massachusetts State Income Tax | 5% to 9% |
| Cambridge Local Income Tax | None |
| Quarterly Due Dates | April 15, June 16, September 15, January 15 |
Cambridge sits across the Charles River from Boston and is home to Harvard University and MIT, anchoring one of the densest biotechnology and technology clusters in the world, with global pharmaceutical, software, and venture-backed startups packed into Kendall Square.
| Local Metric | Cambridge (2026 estimate) |
|---|---|
| Metro population | 120,000 |
| County / jurisdiction | Middlesex County |
| Cost of living index (US avg = 100) | 181 |
| MIT living wage, single adult | $28.00/hour |
| MIT living wage, one earner supporting a family of four | $53.00/hour |
| Applicable minimum wage | $15.00/hour |
| Average rent, 1-bedroom | $3,200/month |
| Average rent, 2-bedroom | $3,900/month |
| Median home price | $950,000 |
| Median household income | $124,000/year |
| Combined sales tax rate | 6.25% |
| Effective property tax rate | 0.52% of value/year |
Local figures are 2026 estimates compiled from the MIT Living Wage Calculator, the C2ER Cost of Living Index, U.S. Census and Zillow housing data, and city and county sources. Verify current figures before relying on them.
If you expect to owe at least $1,000 in federal tax, you generally must pay quarterly. This covers freelancers, contractors, sole proprietors, and LLC members in Cambridge. Massachusetts also requires state estimated payments if you expect to owe more than $400 in state income tax.
Federal estimated taxes are due April 15, June 16, September 15, and January 15. Massachusetts uses the same quarterly schedule as the IRS for its state estimated payments.
A common rule is 25% to 35% of net profit. Because Massachusetts adds state income tax (5% to 9%) on top of federal taxes, Cambridge freelancers often set aside toward the higher end. Use the calculator above for your numbers.
The self-employment tax rate is 15.3% (12.4% Social Security up to $176,100 of net earnings, plus 2.9% Medicare with no cap). It applies to 92.35% of net profit, and half of it is deductible against income tax.
Cambridge does not levy a local personal income tax. Your estimated payments cover federal taxes and Massachusetts state income tax.