Massachusetts State Taxes on RSUs and Stock Options: A Tech Employee's Guide

Massachusetts has quietly become one of the more consequential states for tech employee equity planning — and it's not just because of Cambridge, the Kendall Square startup ecosystem, and the Moderna/Biogen biotech corridor. It's because Massachusetts has two tax features that most tech employees don't know about until they get a tax bill that surprises them.

The first is the Millionaire's Surtax, passed in 2022 and now generating nearly $3 billion annually: an additional 4% tax on income above $1,107,750 (the 2026 inflation-adjusted threshold), on top of the base 5% rate. A senior engineer at a Boston-area public tech company who vests $800,000 of RSUs in a strong year might think they're at the 5% state rate and be wrong — the surtax kicks in and the effective rate on income above the threshold becomes 9%.

The second is that Massachusetts taxes short-term capital gains at 8.5% — a higher rate than its 5% ordinary income rate. This is counterintuitive and opposite to how most people think about capital gains tax: in Massachusetts, selling RSU shares within 12 months of vest at a gain means the appreciation is taxed at 8.5%, not 5%. Holding shares long enough to qualify for long-term treatment brings the rate back down to 5% — so long-term holds are genuinely rewarded at the state level, which isn't always the case in other high-tax states.

This guide covers how Massachusetts taxes RSUs, ISOs, NSOs, and ESPP — including the surtax mechanics that apply at IPO events and large vest years — and how Massachusetts compares to New Hampshire, the zero-income-tax state that borders it to the north.

Massachusetts tax structure for tech employees

The Millionaire's Surtax: mechanics tech employees need to understand

The surtax applies to total Massachusetts taxable income — salary, bonus, RSU vest income, capital gains, ESPP ordinary income, and NSO spreads are all combined before the threshold test. This matters because a tech employee at a high-growth company may have modest salary ($250K) but large RSU vests ($1.2M in a strong year at a public company). The aggregation can push them above $1,107,750 even if no single component would alone.

The 2026 surtax threshold is $1,107,750. This has been increasing with inflation since the original $1M threshold set in 2023: $1,053,750 in 2024, $1,083,150 in 2025, $1,107,750 in 2026.² The threshold will continue adjusting annually.

Illustrative only. Assumes all income is ordinary income (vest or salary). Actual tax depends on deductions, filing status, and other income. Not tax advice.

RSUs in Massachusetts: two tax events

At vest: ordinary income at 5% (or 9% if above the surtax threshold)

When RSUs vest, the fair market value on the vest date is ordinary income — taxed federally at your marginal rate plus FICA, and at the state level by Massachusetts at 5% (or 9% on the portion above the surtax threshold). Unlike Washington, Massachusetts taxes this event. Unlike California, the top rate is 9% not 13.3% — except California's threshold is higher and doesn't create the 9% spike in the same way.

A senior engineer in Cambridge vesting $400,000 of RSUs in 2026 against a total income of $650,000 (well below the surtax threshold) owes approximately $20,000 in Massachusetts state income tax on that RSU event alone. The same engineer in an IPO year with $1.4M of total income would owe closer to $38,000 on the RSU component once the surtax is applied to the amount above $1,107,750.

After vest: sell within 12 months vs. hold for long-term

After RSUs vest, your cost basis is the FMV at vest. Any appreciation from that point is a capital gain. In Massachusetts, this creates a genuine incentive to hold RSU shares for more than 12 months:

• Sell within 12 months of vest: gain is short-term capital gain at 8.5% (12.5% if above the surtax threshold)
• Sell after 12+ months: gain is long-term capital gain at 5% (9% if above threshold)

This is the opposite of what most people expect: in Massachusetts, a long-term hold meaningfully reduces your state tax on the appreciation. The 3.5-percentage-point difference (8.5% vs 5%) on a $200,000 gain is $7,000 — a real number that warrants planning.

ISOs in Massachusetts

At exercise: no Massachusetts state AMT

When you exercise incentive stock options, the spread (FMV minus strike price) is a federal AMT preference item — meaning it can trigger your federal AMT. In California, the same spread also triggers a separate California AMT at a 7% rate, creating a second tax layer. Massachusetts has no state-level AMT. ISO exercises in Massachusetts do not create an additional Massachusetts AMT obligation. You face federal AMT exposure, but the state adds no parallel charge.⁴

This is a meaningful advantage for startup employees in Massachusetts with valuable ISOs compared to their counterparts in California.

At qualifying disposition: LTCG at 5% (9% above surtax threshold)

If you hold ISOs long enough to qualify for preferential federal treatment (2-year hold from grant, 1-year from exercise), the entire gain is federal long-term capital gain. Federally, that's 0/15/20% instead of up to 37%. In Massachusetts, the gain is long-term capital gain at 5% — which is the same as the ordinary income rate, but NOT the higher short-term rate. If your total income including the gain exceeds $1,107,750, the 4% surtax applies to the portion above the threshold.

At disqualifying disposition: ordinary income + potential short-term gain

If you sell ISOs within a year of exercise or two years of grant, the spread at exercise is ordinary income (5% in MA, or 9% above the threshold). Any additional appreciation from exercise price to sale price is a short-term capital gain at 8.5% if held under 12 months from exercise. This stacked exposure — ordinary income at 5% on the spread plus 8.5% on any post-exercise gain — is the most expensive ISO outcome at the state level.

NSOs in Massachusetts

Non-qualified stock options are straightforward. At exercise, the spread is ordinary income — 5% in Massachusetts (9% above the threshold). After exercise, the holding period begins and subsequent appreciation is a capital gain: 8.5% if held under 12 months, 5% if held over 12 months (before surtax). There is no AMT complication at either the federal or state level for NSOs.

ESPP in Massachusetts

Section 423 qualified ESPP plans in Massachusetts follow the standard structure:

• At purchase: No tax event.
• Disqualifying disposition (sell within 1 year of purchase or 2 years of offering start): the discount / look-back benefit is ordinary income at 5% (or 9% above threshold) in Massachusetts. If you sell quickly after purchase (often the lowest-risk "immediate flip" strategy), any additional post-purchase gain is a short-term capital gain at 8.5%.
• Qualifying disposition (hold ≥1 year from purchase AND ≥2 years from offering start): the discount portion is still ordinary income in Massachusetts (5% or 9%). The post-purchase appreciation above the discount basis is long-term capital gain at 5% — which is the same as the ordinary income rate in Massachusetts, providing no additional state-level savings compared to an immediate flip on the ordinary-income portion. But the short-term gain rate (8.5%) on a disqualifying flip of appreciated stock does get avoided.

See the ESPP guide and ESPP calculator for full qualifying vs. disqualifying disposition comparison with federal taxes.

Massachusetts vs. California vs. New Hampshire: the equity tax comparison

New Hampshire is a common destination for Massachusetts tech workers who want to reduce their tax burden — it's a short drive from Boston, has zero state income tax, zero capital gains tax, and zero estate tax. The comparison is stark:

Illustrative marginal state tax estimates only. Actual liability depends on total income, deductions, and filing status. Not tax advice.

Massachusetts is substantially cheaper than California for equity comp — the headline rates (5–9% vs 13.3%) make this obvious. But the gap versus New Hampshire is enormous. For tech employees considering relocating within the region, moving to southern New Hampshire (Nashua, Manchester, Portsmouth) while keeping a remote job at a Massachusetts-headquartered company can be significant — though physical residency in NH must be genuine, and California-style long-arm sourcing does not apply here (NH has no income tax, so there's nothing to claim back).

IPO-year planning in Massachusetts

An IPO event can create an unusually large vest in a single year — when RSUs that have been accumulating vest all at once at IPO. For a Massachusetts tech employee with a large equity grant, this can easily push total income above the $1,107,750 surtax threshold in one year.

Key planning considerations:

• Pre-IPO exercise of ISOs: If you exercise ISOs before the IPO at a low spread, the federal AMT exposure is manageable and the Massachusetts state consequence is zero (no state AMT). You start the clock for qualifying disposition — 1 year from exercise, 2 years from grant — before the big liquidity event.
• RSU double-trigger timing: Public company RSUs vest at IPO date by definition (assuming cliff or double-trigger structure). If the IPO happens in Q1, you have the full remaining year to plan stock sales. Post-lockup, decisions about when and how much to sell interact directly with the surtax threshold.
• Maximize pre-tax contributions in IPO year: Traditional 401(k) contributions, HSA contributions, and any pre-tax deferred comp elections made before the plan year can reduce Massachusetts taxable income and potentially keep you below (or closer to) the $1,107,750 threshold.
• DAF donations in IPO year: Contributing appreciated stock directly to a donor-advised fund before selling avoids capital gains and provides a charitable deduction that further reduces taxable income. See the DAF guide for tech employees.

See the IPO financial planning guide for the full post-IPO playbook.

Massachusetts nonresident equity sourcing: what happens if you move

Massachusetts uses a grant-to-vest allocation to tax nonresidents on equity compensation earned while working in Massachusetts. If you worked in Massachusetts during the grant-to-vest period of RSUs that vest after you move out of state, Massachusetts can claim a portion of that vest income.

The formula: Massachusetts-source income = (Massachusetts workdays during grant-to-vest period) ÷ (total workdays during grant-to-vest period) × total vest income.⁶

Concretely: a software engineer at a Cambridge company who worked in Massachusetts for 2 of a 4-year RSU grant before moving to New Hampshire has approximately 50% of those RSU vests sourced to Massachusetts — and must file a Massachusetts nonresident return and pay Massachusetts tax on that 50%, even as a New Hampshire resident (where there's no state income tax to offset it).

This grant-to-vest sourcing rule is broadly consistent with how most states handle nonresident equity compensation. It is separate from California's rules, which can reach even further. If you have moved out of Massachusetts and still have unvested RSUs from your time there, consult a CPA about your Massachusetts nonresident filing obligations in each vest year.

Massachusetts estate tax: the $2 million threshold matters more than you think

Massachusetts has its own estate tax, separate from the federal estate tax. The Massachusetts estate tax applies to estates over $2 million — raised from the prior $1 million threshold in 2023 — with rates ranging from 0.8% to 16% on amounts above $2M.⁵

The federal estate tax exemption for 2026 is $15 million per person (permanent under OBBBA). For most tech employees, federal estate tax is not a near-term concern. Massachusetts's $2M threshold is a different calculation. A tech employee in Boston with a $1.4M home, $500K in a 401(k), $400K in RSUs, and $300K in a brokerage account has a $2.6M taxable estate — above the Massachusetts threshold, with potentially $50,000–$80,000 in Massachusetts estate tax at death.

Two features of the Massachusetts estate tax that require specific planning:

• No portability: Unlike the federal estate tax, Massachusetts does not allow a surviving spouse to use the deceased spouse's unused exemption. Each spouse gets one $2M exemption, and it's "use it or lose it." Married couples in Massachusetts need a trust structure (typically a bypass trust or disclaimer trust) to make use of both exemptions. This is an area where generic estate planning advice can fail Massachusetts residents.
• No state gift tax: Massachusetts has no state-level gift tax. Annual exclusion gifts ($19,000 per recipient in 2026, $38,000 for couples using gift-splitting) permanently reduce the Massachusetts taxable estate without triggering any Massachusetts tax at the time of the gift. This is a planning opportunity that doesn't exist in all states.

Massachusetts-specific planning strategies for tech employees

1. Track the surtax threshold for large vest events

Before each calendar year, estimate your expected total income including anticipated RSU vests. If you're approaching the $1,107,750 threshold, consider whether you can influence timing: selling appreciated RSUs in a year when income is lower, timing ESPP sales, or maximizing pre-tax accounts (traditional 401(k), HSA, NQDC if available) to reduce taxable income. The surtax is a cliff — the 4% applies only to the amount above the threshold, not retroactively to all income.

2. Hold RSU shares beyond 12 months when concentration risk allows

Massachusetts's 8.5% short-term capital gain rate (vs 5% for long-term) makes the 12-month holding period meaningful at the state level. For stock that has appreciated since vest, the state-level savings from holding 12+ months is 3.5 percentage points. On a $200,000 gain, that's $7,000. This needs to be weighed against concentration risk — holding a large position in employer stock for tax reasons is a real risk if the stock declines. The concentrated stock guide and RSU after-tax calculator can help model this tradeoff.

3. Exercise ISOs before large income events

If you have ISOs at a startup that is approaching an IPO or acquisition, Massachusetts's lack of a state AMT means you can consider exercising ISOs with a larger spread than would be practical in California. The federal AMT exposure still applies, but there is no parallel state-level AMT tax. Early exercise at a low spread starts the qualifying disposition clock and converts future appreciation to long-term capital gain treatment. See the ISO AMT calculator and IPO financial planning guide.

4. Use annual gifts to reduce the Massachusetts taxable estate

Massachusetts has no gift tax. The federal annual gift exclusion ($19,000 per recipient in 2026) permanently removes assets from your Massachusetts taxable estate with no Massachusetts tax consequence at the time of the gift. For tech employees with a growing net worth, systematic annual gifting to children, parents, or other beneficiaries is a simple, no-state-tax-cost strategy to stay below the $2M Massachusetts estate tax threshold.

5. Plan for estate tax with trusts if you own a home in Massachusetts

Home ownership in Boston, Cambridge, or other high-cost Massachusetts markets can itself push a couple's combined estate above the $4M level that requires careful bypass trust planning (to utilize both spouses' $2M exemptions). Unlike the federal system, Massachusetts doesn't allow portability, so the planning must be done proactively — not after the first death. See the estate planning guide for tech employees.

6. Donate appreciated RSU or ESPP shares to a DAF in high-income years

In a year when total income is approaching the surtax threshold, donating appreciated shares directly to a donor-advised fund provides a charitable deduction (reducing taxable income) and eliminates the capital gain event entirely — no short- or long-term capital gain at the state level. For someone with charitable intent, this is almost always superior to selling shares and donating cash. See the DAF strategy guide.

What a fee-only advisor can help you model

• Your combined federal + Massachusetts marginal rate on RSU vests given current and projected total income (including the surtax cliff)
• Whether holding RSU shares beyond 12 months is worth the concentration risk in your specific situation, factoring in both the 8.5% vs 5% state-level difference and the federal LTCG savings
• ISO exercise strategy if you have startup options approaching an IPO — Massachusetts's lack of state AMT is an advantage worth modeling properly
• Massachusetts estate tax exposure based on your balance sheet, and whether bypass trust or annual-gifting strategies are appropriate at your current wealth level
• Nonresident filing obligations if you've moved out of Massachusetts and still have unvested grants from your time there