Massachusetts Millionaires Tax: What the 4% Surtax Means for Business Owners

In 2022, Massachusetts voters approved the Fair Share Amendment, creating a 4% surtax on high earners that took effect January 1, 2023. Known colloquially as the "millionaires tax," this additional state levy applies to residents with annual taxable income exceeding $1,000,000. For business owners in Massachusetts, the surtax has real implications for personal cash flow, tax planning, and business structure decisions. This guide explains what the surtax is, who it affects, and how to think about it in the context of your business.

What Is the Massachusetts Millionaires Tax?

The surtax is an additional 4% state income tax on the portion of your Massachusetts taxable income that exceeds $1,000,000 in a single tax year. It stacks on top of Massachusetts's standard personal income tax rate of 5.0%, meaning high-income residents can face a combined state income tax of up to 9.0% on income over $1 million.

The $1,000,000 threshold is adjusted annually for inflation based on the Consumer Price Index. This means the exact dollar threshold may shift slightly each year, but the principle remains the same: income above the adjusted threshold faces the additional 4% levy.

For example, if your 2026 taxable income in Massachusetts is $1,200,000, you would owe the standard 5.0% rate on all income plus an additional 4% on the $200,000 above the threshold.

Who Pays the Massachusetts Surtax?

Massachusetts applies the surtax to residents and part-year residents. The tax is based on your status as defined by Massachusetts law, not your citizenship or domicile for federal purposes. If you live in Massachusetts and have taxable income exceeding the threshold, the surtax applies.

The surtax affects business owners in different ways depending on how your business is structured and taxed:

• S-Corporation owners: If you own an S-corp, corporate income passes through to your personal return and is subject to the surtax.
• LLC members: Single-member LLCs and multi-member LLCs taxed as partnerships pass income through to owners, triggering the surtax if total income exceeds the threshold.
• Sole proprietors: All net business income flows to your personal return and is subject to the surtax.
• C-Corporation owners: C-corp owners pay the surtax only on distributions (dividends). The corporation itself may be subject to the corporate excise tax, a different levy entirely.
• Investors and W-2 employees: Wages, salaries, and investment income all count toward the surtax threshold.

How the Surtax Is Calculated

The calculation is straightforward but important to understand:

1. Determine your total Massachusetts taxable income for the year from all sources (wages, business income, investment income, etc.).
2. Subtract the adjusted $1,000,000 threshold to find the amount subject to the surtax.
3. Apply the 4% surtax to that amount.
4. Add the surtax to your regular Massachusetts income tax (5.0% of all income).

Example: You're a Massachusetts resident with $1,300,000 in taxable income from your LLC and investment returns.

• Regular Massachusetts income tax: $1,300,000 x 5.0% = $65,000
• Surtax on amount over $1,000,000: $300,000 x 4.0% = $12,000
• Total Massachusetts state income tax: $77,000
• Effective state rate on income over $1M: 9.0%

The surtax applies to taxable income as defined under Massachusetts law, which generally tracks federal taxable income. Deductions you take on your federal return (like mortgage interest, charitable donations, or business expenses) also reduce your Massachusetts surtax liability.

Impact on Different Business Structures

Pass-Through Entities (LLC, S-Corp, Partnership)

If your business is a pass-through entity, the surtax is unavoidable if your total income exceeds the threshold. The business itself does not pay the surtax, but all income attributed to you personally becomes subject to the 4% surcharge. This is a key consideration when deciding whether to form an LLC, S-corp, or other structure. The surtax is not an argument for incorporating as a C-corp (if your goal is to avoid high individual taxes), but it is context for understanding the full tax burden of pass-through ownership in Massachusetts.

C-Corporation Structure

A C-corporation owner can potentially defer the surtax by leaving income inside the corporation rather than taking distributions. However, C-corporations pay their own Massachusetts corporate excise tax, which is 8.0% of net income taxable in Massachusetts, plus a $2.60 per $1,000 property and tangible net worth tax, with a minimum excise of $456. The combination of corporate tax plus eventual distribution taxes often exceeds the savings from surtax deferral, so this is rarely a practical strategy for Massachusetts business owners. The decision to incorporate as a C-corp should be driven by operational needs and federal tax planning, not surtax avoidance alone.

Sole Proprietors and Freelancers

All net business income from a sole proprietorship counts toward the surtax threshold. Self-employment tax (Social Security and Medicare) is calculated on the same income, so high-earning sole proprietors face both the surtax and self-employment tax obligations on income over $1 million. Forming an LLC or S-corp may reduce self-employment tax slightly, but it does not eliminate the surtax.

Massachusetts in Context: Income Tax Rates Compared

Massachusetts's combined top rate of 9.0% on income over $1 million is high compared to some states. However, Massachusetts has no sales tax on services, moderate property taxes in many towns, and substantial tax incentives for research and development. Understanding where Massachusetts fits in the broader tax landscape helps with strategic business planning.

The surtax is one layer in a broader Massachusetts tax system that includes corporate excise, capital gains tax (5.0% on gains over $100,000, with a long-term holding period discount), and local property and sales taxes. Business owners should review their overall tax picture, not the surtax in isolation.

Planning Considerations for Business Owners

Timing of Income

If your business income fluctuates, managing the timing of distributions or business income can matter. For example, if you project income of $1,050,000 for the year, deferring $100,000 to the next year drops your current surtax by $4,000. This is not a reason to distort business operations, but awareness of the threshold is useful when you have discretion over the timing of compensation or distributions.

Compensation Strategy for Owners

If you own an S-corp, the choice between paying yourself wages (subject to self-employment tax but not double-subject to self-employment and income tax) versus distributions (not subject to self-employment tax but subject to income tax including the surtax) shifts with the surtax. Neither strategy eliminates the surtax, but the combination of income tax and self-employment tax obligations changes the math.

Residency Considerations

Massachusetts taxes residents and part-year residents on all income. If you are considering leaving Massachusetts, the surtax may be one factor, but it should be weighed against the business, family, and operational costs of relocating. Other states have their own income taxes and business costs that may not be lower in aggregate. Consult a tax professional if residency changes are under consideration.

Partnership and Multi-Owner Structures

In a partnership or multi-member LLC, each owner's surtax obligation is based on their share of income and their individual circumstances. The surtax does not apply to the business entity itself, only to owners' personal returns. This is an opportunity to review partnership agreements and operating agreements to ensure they align with all owners' tax situations.

Deductions and Credits

The surtax is calculated on taxable income, not gross income. All deductions that reduce your Massachusetts taxable income also reduce your surtax liability. This includes business expenses, home office deduction, charitable contributions (itemized or standard), and other deductions allowed under Massachusetts law. Working with a CPA or tax attorney to maximize deductions is one legitimate way to reduce surtax exposure without changing business structure.

Massachusetts does not offer state tax credits specifically designed to offset the surtax, though some general credits (like dependent care, property tax, or research and development credits) may reduce your overall state tax liability.

Reporting and Compliance

Massachusetts taxable income is reported on Form 1, the state income tax return. The surtax is calculated automatically if your income exceeds the adjusted threshold. You do not file a separate surtax return. However, you must ensure that all business income, distributions, and other income sources are accurately reported. Inconsistencies between federal and state tax returns can trigger audits.

If you have income from multiple sources or complex business income from pass-through entities, working with a Massachusetts tax professional is worthwhile to ensure proper reporting and to identify planning opportunities.

Why the Tax Was Enacted and What Revenue Funds

The surtax was approved by Massachusetts voters in 2022 with the stated purpose of funding education and transportation infrastructure. Revenue from the surtax is directed to the State Transportation Fund and Education Fund. Understanding the policy rationale does not change the tax obligation, but it provides context for the permanence and scope of the tax. This is not a temporary or easily reversed policy.

Key Takeaways for Massachusetts Business Owners

• The Massachusetts millionaires tax adds a 4% surtax to income over $1,000,000 (adjusted annually for inflation). It stacks on top of the standard 5.0% income tax rate.
• Pass-through entities (LLCs, S-corps, partnerships) cannot avoid the surtax. Income passes through to owners and is taxed at the owner level.
• The surtax affects total income from all sources, not just business income. Wages, investment income, and business distributions all count.
• Planning opportunities exist around timing of income, choice of business structure, and maximization of deductions, but they are marginal. The surtax should not drive major business decisions.
• Massachusetts's overall tax environment includes the surtax plus corporate excise tax, capital gains tax, and local taxes. Review your full tax picture, not the surtax in isolation.
• Consulting a Massachusetts tax professional or CPA is advisable if your business income is complex or approaching the surtax threshold.

Legal and Tax Disclaimer

This guide is informational content about Massachusetts tax law and is not legal or tax advice. Tax laws are complex and individual circumstances vary. Do not rely on this content to make tax decisions or file your tax return. Consult a qualified tax professional, CPA, or tax attorney licensed in Massachusetts before making business structure decisions, tax planning moves, or filing decisions related to the millionaires tax. The Massachusetts Department of Revenue website at https://www.mass.gov/orgs/massachusetts-department-of-revenue provides official guidance and resources.