What changed with the 2023 Massachusetts estate tax reform?

Chapter 50 of the Acts of 2023, signed October 4, 2023, raised the MA estate tax exclusion from $1,000,000 to $2,000,000 — effective for decedents dying on or after January 1, 2023. The reform eliminated the cliff that existed under the prior law (where exceeding $1M triggered tax on the entire estate, not just the excess). Under the new law, the exclusion is applied as a fixed credit equal to the tax on a $2M estate, applied against the tax on the full estate.

Does Massachusetts have an estate tax cliff like New York?

No. Under the post-2023 reform, Massachusetts does not have a cliff. The credit is a fixed amount (the tax on a $2M estate) subtracted from the tax on the full estate. An estate just above $2M pays modest tax on the excess; the credit remains the same regardless of estate size. New York's cliff (where passing a threshold eliminates the entire credit) does not exist in Massachusetts.

Can Massachusetts spouses share their estate tax exclusions (portability)?

No. Massachusetts has no portability provision. Each spouse has their own $2M exclusion, and any unused exclusion is forfeited at death. This makes credit shelter (AB) trusts or other estate planning techniques important for married couples with combined estates above $2M. Without planning, the first spouse to die may waste their entire $2M exclusion if all assets pass outright to the survivor.

What are the Massachusetts estate tax rates?

Massachusetts uses the old federal estate tax table (circa 2001) as the rate schedule. Rates start at 0.8% above the $40,000 floor and graduate up to 16% on amounts above $10 million. The credit mechanism effectively means estates between $2M and ~$3M pay around 5%–8% effective rates. Massachusetts estate tax is filed on Form M-706 within 9 months of death.

How do retirement accounts interact with the MA estate tax?

Retirement accounts with named beneficiaries (IRA, 401k, 403b) typically pass outside the estate and are NOT included in the MA taxable estate. However, if the estate is the beneficiary (or if there is no named beneficiary), the balance is included. IRAs are NOT eligible for the marital deduction because they must be distributed; a spousal rollover may be available but changes the character of the asset.

Tax

Massachusetts Estate Tax Calculator 2025 — $2M Exclusion, No Cliff

Calculate Massachusetts estate tax after the 2023 reform. The MA exclusion is $2,000,000 with no cliff (unlike NY). No spousal portability. Rates up to 16%. MA estate tax applies to many estates that owe zero federal tax.

By The FinCalc TeamUpdated May 31, 2026

Massachusetts imposes a state estate tax on estates above $2,000,000 — significantly lower than the $13.99M federal exclusion. The $2M threshold was established by the Massachusetts estate tax reform signed into law on October 4, 2023 (Chapter 50 of the Acts of 2023), doubling the prior $1M exclusion. Unlike New York, Massachusetts has no exclusion cliff — the credit is a fixed offset regardless of estate size. Unlike the federal system, Massachusetts offers no portability: a surviving spouse cannot use the deceased spouse's unused $2M exclusion, making credit shelter trust planning important for married couples.

How Massachusetts Estate Tax Is Calculated

Massachusetts estate tax uses a credit-offset mechanism:

Step 1 — Compute taxable estate:

Taxable estate = Gross estate
              − Debts and administration expenses
              − Unlimited marital deduction (US-citizen spouse)
              − Charitable deductions

Step 2 — Compute gross MA estate tax using the rate schedule:

MA gross tax = Marginal brackets from 0.8% (above $40K) to 16% (above $10M)
               Applied to the full taxable estate

Step 3 — Apply the $2M exclusion credit:

Exclusion credit = MA tax computed on a $2,000,000 estate (fixed amount)
MA estate tax = max(0, gross tax − exclusion credit)

No cliff — gradual effective rates above $2M:

Taxable estate $1M–$2M: $0 tax (credit exceeds gross tax)
Taxable estate $2.1M: very small tax (gross tax just slightly above credit)
Taxable estate $3M: moderate effective rate (~4%–6%)
Taxable estate $5M+: higher effective rates, approaching marginal rates

No portability: Each spouse has a $2M exclusion — unused portion is lost.

When to Use This Calculator

Use this calculator when:

Comparing NY vs. MA estate tax for snowbirds — NY and MA both impose state estate taxes with lower thresholds than federal. NY has a cliff; MA does not. Use this calculator to compare exposure.
Planning an AB trust or credit shelter trust — For married couples with estates above $2M, modeling the benefit of a credit shelter trust (ensuring both spouses' $2M exclusions are used) shows the potential MA tax savings.
Post-reform planning (2023+) — If you planned around the old $1M MA exclusion, recalculate your exposure under the new $2M threshold — your estate may no longer face MA tax.
Evaluating charitable bequests — A charitable bequest reduces the taxable estate and can eliminate MA estate tax entirely for estates near the $2M threshold.
Comparing the value of lifetime gifting — Massachusetts has no gift tax, so lifetime gifts reduce the MA taxable estate dollar for dollar without any gift tax cost.

Understanding the Inputs

Gross Estate Value: Total fair market value of all assets at the date of death: real property, investment accounts, bank accounts, retirement accounts payable to the estate (IRAs and 401(k)s with named beneficiaries pass outside the estate), life insurance payable to the estate, business interests, and personal property.
Debts, Mortgages & Admin Expenses: Mortgages and other liabilities owed at death, funeral expenses, and estate administration costs (attorney fees, executor fees, court costs). All reduce the taxable estate.
Marital Deduction: Assets passing outright to a US-citizen surviving spouse. Massachusetts has an unlimited marital deduction — no MA estate tax on assets passing to a surviving US-citizen spouse. However, unlike federal law, MA has no portability — the survivor cannot use any unused MA exclusion from the deceased spouse.
Charitable Deduction: Bequests to qualifying charitable organizations. Reduces the taxable estate dollar for dollar. Both direct bequests and charitable trusts qualify (subject to rules).

Frequently Asked Questions

Related Calculators

New York Estate Tax Calculator 2025 — Cliff, Exclusion & Rates

Tax

Massachusetts Millionaires Surtax Calculator (Fair Share Amendment)

Tax

Capital Gains Tax Calculator — Federal LTCG Rates + NIIT + State

Tax

The FinCalc Team

Personal Finance Experts

The FinCalc team is a group of personal finance writers, analysts, and engineers dedicated to building accurate, transparent financial calculators. Every formula is verified against industry standards and explained in plain language.

Last reviewed and updated: May 31, 2026