2025 Tax Year

Massachusetts Side Hustle Tax Calculator

Calculate your Massachusetts state tax (5%), federal tax, and self-employment tax on 1099 income.

MA5%

7 million residents

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2025 rates

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Last updated: January 2026 · Data from IRS Rev Proc 2024-40

Filing Status

State

W-2 Income (from your day job)

Side Hustle Income *

Business Expenses (optional)

Massachusetts side hustlers face a moderate tax burden with the state's flat 5% income tax rate. Whether you're a freelance developer in Boston, a rideshare driver in Cambridge, or selling crafts from Worcester, you'll pay the same percentage regardless of income level.

Massachusetts Tax Guide

How Side Hustle Taxes Work in Massachusetts

Massachusetts uses a flat tax system:

**Massachusetts state tax:** - Flat rate: 5% on all taxable income - No brackets—everyone pays the same percentage

**No local income taxes:** - Boston, Cambridge, and all Massachusetts cities do not levy income taxes

Massachusetts' 5% flat rate is moderate compared to other Northeastern states—lower than New York's top rate of 10.9%.

Example

What Massachusetts Side Hustlers Owe

Let's say you're a single filer in Boston with a $65,000 W-2 job and $20,000 in side hustle income from freelance consulting, with $3,000 in business expenses.

**Your estimated taxes on the side hustle:** - Net self-employment income: $17,000 - Federal SE tax (15.3% of 92.35%): ~$2,403 - Federal income tax on side income: ~$3,740 (22% bracket) - Massachusetts state tax (5%): ~$850 - **Total additional tax: ~$6,993**

Important Dates

Massachusetts Tax Deadlines 2025

Massachusetts follows federal quarterly estimated tax deadlines: - **Q1**: April 15, 2025 - **Q2**: June 17, 2025 - **Q3**: September 16, 2025 - **Q4**: January 15, 2026

Use Massachusetts Form 1-ES for state estimated tax payments.

Save Money

Common Deductions for Massachusetts Freelancers

Massachusetts freelancers should maximize deductions to reduce their flat 5% state tax burden. **Home office expenses**: Claim dedicated business space using simplified ($5/sq ft) or actual expense method—valuable given Boston-area housing costs. **Business mileage**: 67 cents/mile for 2025; essential for those traveling to client sites across the metro area. **Equipment and software**: Computers, cameras, professional tools, and business software; Massachusetts generally follows federal Section 179 treatment. **Professional services**: Accounting, legal, and tax preparation fees are fully deductible. **Health insurance premiums**: Self-employed individuals can deduct 100% of health, dental, and vision insurance. **Retirement contributions**: SEP-IRAs (up to 25% of net self-employment income) and Solo 401(k)s reduce both federal and Massachusetts taxable income. **Professional development**: Courses, certifications, and industry conferences that improve your skills qualify. **Marketing expenses**: Website costs, business cards, and promotional materials are deductible. Massachusetts generally follows federal deduction rules, so most Schedule C deductions automatically reduce your state taxes. Every dollar deducted saves you 5% in MA taxes plus your federal marginal rate.

Common Questions

Massachusetts Side Hustle Tax FAQ

What is Massachusetts' tax rate on side hustle income?

Massachusetts has a flat 5% income tax rate on all earned income, including self-employment earnings.

Does Boston have a city income tax?

No, Boston and all Massachusetts cities do not have local income taxes. You only pay the state 5% flat rate plus federal taxes.

How does Massachusetts compare to other New England states?

Massachusetts' 5% flat rate is moderate for New England. New Hampshire has no income tax on earned income. Connecticut and Vermont have progressive rates that can exceed 6-8%.

Do I need to register my side hustle in Massachusetts?

Most businesses need to register with the Massachusetts Secretary of State. If using a DBA, file a Business Certificate with your city or town clerk. LLCs must register with the Secretary of the Commonwealth. Sellers may need a Sales Tax Registration.

Does Massachusetts have a millionaires tax that affects side hustlers?

The Massachusetts "millionaires tax" adds 4% on income over $1 million, for a total rate of 9%. Most side hustlers won't reach this threshold, but high-earning freelancers should be aware of the additional tax on income above $1 million.

Can I deduct retirement contributions on Massachusetts taxes?

Yes, SEP-IRA and Solo 401(k) contributions reduce your federal AGI, which Massachusetts uses to calculate state taxes. Every dollar contributed saves you at your federal rate plus 5% in Massachusetts taxes.

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