Self-Employment Tax in Massachusetts (2026 Guide)

Fact-checked by the LegalGlass editorial team against primary sources · Published Aug 20, 2026 · Last updated Aug 20, 2026

Massachusetts does not impose its own self-employment tax. If you are self-employed in Massachusetts you pay the federal self-employment tax of 15.3% - 12.4% Social Security plus 2.9% Medicare - on your net earnings from self-employment, and then pay Massachusetts personal income tax on the same profit as ordinary income.

Quick Answer

Federal SE tax rate: 15.3% total (12.4% Social Security + 2.9% Medicare)
Massachusetts SE tax: None - no separate state self-employment tax
Federal form: Schedule SE, filed with Form 1040
Social Security cap: 12.4% portion stops at the annual Social Security wage base (set by SSA)
Additional Medicare Tax: 0.9% above $200,000 single / $250,000 joint / $125,000 married filing separately
State return: Massachusetts personal income tax on the same net profit

Massachusetts Has No State Self-Employment Tax

The phrase "self-employment tax in Massachusetts" describes a federal tax paid by people who happen to live or work in Massachusetts. Self-employment tax is federal. It is imposed by the Internal Revenue Code, collected by the IRS, and funds Social Security and Medicare. Massachusetts levies no parallel state SE tax on top of it.

What Massachusetts does levy is its personal income tax on the same profit. So a Massachusetts freelancer with $80,000 of net business profit faces two separate bills on that one number: federal self-employment tax under the IRS rules, and Massachusetts personal income tax under Chapter 62 of the General Laws. Federal income tax is a third layer on the same profit.

How the 15.3% Breaks Down

The IRS states the self-employment tax rate as 15.3%, composed of 12.4% for Social Security (old-age, survivors, and disability insurance) and 2.9% for Medicare (hospital insurance). The two halves behave very differently.

The Social Security half is capped. Only combined wages, tips, and net earnings up to the annual Social Security wage base are subject to the 12.4%. The Social Security Administration resets that base each year, so check the SSA contribution and benefit base before running a projection rather than assuming last year's figure. The Medicare half is uncapped: 2.9% applies to every dollar of net earnings.

Above certain income levels an Additional Medicare Tax of 0.9% applies. The IRS thresholds are $200,000 for single filers, $250,000 for married filing jointly, and $125,000 for married filing separately. It is an employee-side tax with no employer-equivalent deduction.

Who Owes It

You owe self-employment tax if you have net earnings from self-employment. That includes sole proprietors and independent contractors filing Schedule C, general partners in a partnership, and members of a multi-member LLC taxed as a partnership who receive distributive shares of ordinary business income. It also includes the owner of a single-member LLC: the IRS treats an SMLLC as a disregarded entity by default, so its profit lands on the owner's Schedule C and flows to Schedule SE exactly as a sole proprietorship's would.

You do not owe SE tax on investment income, most rental income, or W-2 wages - wages carry FICA withholding instead, and any wages you earn count against the same Social Security wage base, which is why the IRS instructions tell wage earners with side businesses to coordinate the two.

Calculating the Tax

The mechanics run through Schedule SE, filed with Form 1040. Start with net profit from Schedule C (or your share of partnership ordinary income), multiply by 92.35% to reach net earnings from self-employment, then apply 12.4% up to the Social Security wage base and 2.9% to the whole amount. The 92.35% step exists so the self-employed are not taxed on the portion of profit that an employer would have paid in payroll tax.

You then deduct the employer-equivalent portion - generally one half of the SE tax - as an above-the-line adjustment on Form 1040. It reduces income tax, not the SE tax itself, and because Massachusetts starts from federal concepts of gross income, the deduction indirectly matters on the state side too.

The Massachusetts Layer

Massachusetts taxes the profit again as personal income. Chapter 62, Section 2 defines Massachusetts gross income by reference to federal gross income with statutory modifications, and Section 4 sets the rates. Massachusetts applies a flat rate to most Part B income and adds a surtax on income above a high annual threshold that the Department of Revenue indexes each year. Because both the base rate and the surtax threshold are set by statute and adjusted, confirm the current figures on the Department of Revenue's tax rates page before you file rather than relying on a remembered number.

There is no Massachusetts "SE tax return." The profit shows up on your Massachusetts individual income tax return. If your business is an LLC or corporation, additional entity-level filings may apply - see Massachusetts LLC tax filing.

Quarterly Estimated Payments

Self-employment income carries no withholding, so both governments expect payments during the year. The IRS requires estimated tax payments when you expect to owe $1,000 or more, and those payments must cover income tax and self-employment tax together. Massachusetts runs its own estimated payment schedule for state income tax.

A practical rule for a Massachusetts freelancer: set aside a fixed percentage of every payment received into a separate account and remit quarterly. Underpayment penalties are assessed separately by each government, and paying the full balance in April does not cure a missed quarter.

Does an LLC or S-Corp Change the Answer?

Forming an LLC alone changes nothing for self-employment tax. The IRS classifies a domestic LLC as a disregarded entity or a partnership by default, and in both cases the owner's share of ordinary business income is subject to SE tax. What can change the result is a tax election.

An LLC that elects S-corporation treatment on Form 2553 pays its owner-employee reasonable wages subject to payroll tax and can distribute remaining profit without self-employment tax. The trade-off is real administrative cost: payroll registration, quarterly payroll returns, an EIN, and a separate entity return. The IRS requires the wages to be reasonable for the services performed, and the reasonable-compensation standard is a frequent audit issue. Weigh it with S-corp vs LLC and S-corp election in Massachusetts.

An LLC can also elect corporate treatment on Form 8832, which moves profit into the corporate tax system entirely. That is rarely the right answer for a solo service business but matters for companies retaining earnings.

Deductions That Move the Number

Self-employment tax is computed on net earnings, so every legitimate business deduction reduces both the SE tax and the income tax. Ordinary and necessary business expenses, the deductible portion of a home office, business mileage, and health-insurance premiums for the self-employed all reduce taxable profit under federal rules; the self-employed health insurance deduction reduces income tax but not SE tax. Retirement contributions to a SEP-IRA or solo 401(k) likewise reduce income tax without reducing the SE tax base.

Because the SE tax base is profit rather than revenue, disciplined bookkeeping is worth more than any single tax strategy. See the business tax hub for the wider filing calendar.

Common Mistakes

Three errors show up repeatedly. Assuming an LLC eliminates SE tax - it does not, absent an election. Forgetting that W-2 wages already consumed part of the Social Security wage base, which causes over- or under-payment of the 12.4% portion. And treating the Massachusetts return as optional because federal estimated payments were made; the two systems are independent, and Massachusetts assesses its own penalties.

If you are also deciding on entity structure, read sole proprietorship in Massachusetts and how to form an LLC in Massachusetts, and check whether your city or town requires a local business license. Registering a trade name is covered in Massachusetts DBA filing, and the glossary defines the terms used above.

Frequently Asked Questions

Does Massachusetts have a self-employment tax?

No. Massachusetts does not levy a separate state self-employment tax. Self-employment tax is a federal tax collected by the IRS to fund Social Security and Medicare. Massachusetts taxes the same business profit through its personal income tax, reported on your Massachusetts individual return, so the profit is taxed once federally for SE tax and once by the state as income.

What is the self-employment tax rate for 2026?

The IRS sets the self-employment tax rate at 15.3%, made up of 12.4% for Social Security (old-age, survivors, and disability insurance) and 2.9% for Medicare. The 12.4% Social Security portion applies only up to the annual Social Security wage base, which the Social Security Administration adjusts each year. The 2.9% Medicare portion has no ceiling.

Who pays self-employment tax in Massachusetts?

Anyone with net earnings from self-employment, including sole proprietors, independent contractors, partners in a partnership, and members of a multi-member LLC treated as a partnership. A single-member LLC is a disregarded entity by default, so its owner reports business profit on Schedule C and pays SE tax on Schedule SE just like a sole proprietor.

Can I deduct part of the self-employment tax?

Yes. The IRS lets you deduct the employer-equivalent portion of self-employment tax - generally half - when figuring your adjusted gross income on Form 1040. The deduction affects income tax, not the SE tax calculation itself. You claim it whether or not you itemize, and it flows through to the Massachusetts return through federal AGI.

Do I have to make estimated tax payments?

Usually yes. Self-employment income has no withholding, so the IRS expects quarterly estimated payments covering both income tax and self-employment tax when you will owe $1,000 or more. Massachusetts has its own estimated-payment system for state income tax. Missing either can trigger an underpayment penalty even if you pay in full at filing.

Does forming an LLC reduce self-employment tax in Massachusetts?

Not by itself. A default-taxed LLC produces the same self-employment tax as a sole proprietorship. What can change the result is electing S-corporation treatment on IRS Form 2553, which splits profit into reasonable wages subject to payroll tax and distributions that are not subject to SE tax. That election adds payroll filings and state obligations.

Sources

IRS - Self-Employment Tax (Social Security and Medicare Taxes) (15.3% rate; 12.4% Social Security; 2.9% Medicare; Additional Medicare Tax thresholds of $200,000 single, $250,000 married filing jointly, $125,000 married filing separately).
IRS - About Schedule SE (Form 1040).
IRS - Estimated Taxes.
IRS - Single Member Limited Liability Companies.
IRS - Limited Liability Company (LLC).
IRS - About Form 2553 (S-corporation election).
IRS - About Form 1065 (partnership return).
Massachusetts General Laws - Chapter 62, Section 4 (rates of tax on personal income).
Massachusetts General Laws - Chapter 62, Section 2 (Massachusetts gross income).
Massachusetts Department of Revenue - DOR home (personal income tax filing and estimated payments).
Massachusetts Department of Revenue - Massachusetts tax rates (current personal income tax rate and surtax).
Social Security Administration - Contribution and Benefit Base (annual Social Security wage base).

LegalGlass provides general information for educational purposes and is not legal advice, is not a law firm, and is not a substitute for advice from a licensed attorney or tax professional. Laws, fees, and thresholds change; verify current amounts with the IRS and the Massachusetts Department of Revenue before acting.