Massachusetts corporate excise tax is 8.0%. Does not conform to federal bonus depreciation. The 4% "millionaire's tax" surtax applies to income over $1M.
Key Planning Insight:
Massachusetts imposes a 4% surtax on income over $1 million, bringing the effective top rate to 9%. Short-term capital gains are taxed at 8.5%. PTET election is available and critical for high earners.
Massachusetts-Specific Tax Strategies
These strategies are especially powerful or unique in Massachusetts. Click any strategy to learn more.
Massachusetts' PTET election allows pass-through entities to pay the 5% state tax (9% for income over $1M under the new surtax) at the entity level. This is especially valuable for high-income business owners affected by the millionaire's tax.
Massachusetts enacted a 4% surtax on income over $1 million (on top of the 5% flat rate, for a combined 9%). Planning strategies include income timing, charitable giving (DAFs), retirement contributions, and the PTET election to minimize exposure to the surtax threshold.
Tax-loss harvesting involves selling investments at a loss to offset capital gains and up to $3,000 of ordinary income per year. Unused losses carry forward indefinitely. This strategy is especially powerful when combined with portfolio rebalancing and can significantly reduce your annual tax bill.
Qualified Opportunity Zone (QOZ) investments allow you to defer and reduce capital gains taxes by investing in designated economically distressed areas. Gains invested in a Qualified Opportunity Fund (QOF) are deferred until 2026, and if held 10+ years, any appreciation on the QOZ investment is tax-free.
Section 179 allows businesses to deduct the full purchase price of qualifying equipment, vehicles, and software in the year of purchase rather than depreciating over time. The 2026 federal limit is over $1 million. Some states cap or limit Section 179 conformity — check your state rules.
Choosing the right business structure is the single biggest tax decision you'll make. Here's what Massachusetts LLC and S-Corp owners need to know.
Massachusetts LLC Formation
Massachusetts LLCs are taxed as pass-through entities by default. All profits flow to your personal return and are taxed at 5.0% (+ 4% surtax on income over $1M). Electing S-Corp status can significantly reduce your self-employment tax burden.
LLC vs. S-Corp in Massachusetts
Massachusetts offers a Pass-Through Entity Tax (PTET) election — a major advantage for LLC and S-Corp owners. By paying state income tax at the entity level, you bypass the $10,000 federal SALT deduction cap and deduct the full state tax bill on your federal return.
Top LLC Write-Offs in Massachusetts
Massachusetts LLC owners can deduct: business expenses (IRC §162), home office (IRC §280A), vehicle mileage (IRC §179), Section 179 equipment expensing, retirement contributions (Solo 401k or SEP-IRA), health insurance premiums, and business meals. Note: Massachusetts does not conform to federal bonus depreciation — an add-back on your state return may be required.
Massachusetts Business Tax Note
Massachusetts corporate excise tax is 8.0%. Does not conform to federal bonus depreciation. The 4% "millionaire's tax" surtax applies to income over $1M.
All Federal Write-Offs That Apply in Massachusetts
These federal strategies apply to Massachusetts residents and business owners. Click any strategy to see full details, savings estimates, and eligibility requirements.
Common questions about Massachusetts LLC taxes, S-Corp elections, and business write-offs — answered by Uncle Kam's tax advisors.
Massachusetts's top marginal income tax rate is 5.0% (+ 4% surtax on income over $1M). Business owners and self-employed individuals pay this rate on their net business income. Strategies like the S-Corp election, pass-through entity tax (PTET) election, and maximizing deductions can significantly reduce your effective Massachusetts tax rate.
The most powerful write-offs for Massachusetts LLC owners include: the S-Corp election to reduce self-employment taxes, Section 179 and bonus depreciation for equipment and real estate, the home office deduction, vehicle and mileage deductions, Solo 401(k) or SEP-IRA contributions, and business meals and travel. Massachusetts-specific strategies like the PTET election and state-specific credits can add further savings.
Yes. Massachusetts offers a pass-through entity tax election that allows S-Corps and partnerships to pay state income tax at the entity level. This is a powerful SALT workaround that lets business owners deduct state taxes on their federal return, bypassing the $10,000 SALT cap. Uncle Kam's tax advisors can help you determine if the Massachusetts PTET election is right for your business.
Massachusetts does not fully conform to federal bonus depreciation rules. You may need to add back bonus depreciation on your Massachusetts state return and depreciate assets over a longer schedule. However, Section 179 expensing may still be available up to Massachusetts's state cap. A tax advisor can help you navigate this.
For most Massachusetts business owners earning over $60,000 in net profit, electing S-Corp status can save $5,000–$20,000 per year in self-employment taxes. The right choice depends on your income level, Massachusetts's franchise or minimum tax requirements, and your business structure. Uncle Kam's advisors specialize in Massachusetts entity structuring — book a free call to get a personalized recommendation.
Self-employed individuals in Massachusetts can reduce state taxes by: maximizing business deductions (home office, vehicle, equipment), contributing to a Solo 401(k) or SEP-IRA, electing S-Corp status to reduce self-employment tax, using the PTET election if available, and timing income and deductions strategically. A Massachusetts-based tax strategy session with Uncle Kam can identify your biggest opportunities.
Real estate investors in Massachusetts benefit most from cost segregation studies (accelerating depreciation on commercial and rental properties), the 1031 exchange (deferring capital gains on property sales), bonus depreciation (if Massachusetts conforms), the short-term rental loophole, and real estate professional status (REPS). Massachusetts's specific tax rules can significantly impact your real estate ROI — get a free strategy review from Uncle Kam.
WHAT MOST MASSACHUSETTS BUSINESS OWNERS DON'T KNOW
The Massachusetts PTET election can save S-Corp and LLC owners thousands by bypassing the $10,000 SALT cap — most accountants don't file it proactively.
Massachusetts does NOT conform to federal bonus depreciation — you may need a state add-back, which many taxpayers miss.
Most taxpayers leave the QBI deduction unclaimed — it reduces taxable income by up to 23% starting 2026 under the OBBBA.
