Massachusetts Estate Tax Calculator

Pri Geens

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Massachusetts Estate Tax Calculator

Estimate the combined federal and Massachusetts estate tax on a Massachusetts decedent’s estate. Massachusetts imposes its own estate tax (Form M-706): for deaths on or after January 1, 2023 the exemption is $2,000,000 and the old cliff is gone, so tax is the graduated 0.8% to 16% schedule less a credit equal to the tax on $2,000,000. Massachusetts does not port its exemption. Three modes: estimate the tax, test a larger estate, or solve for the years of gifting needed to reach zero. Fields marked * are required; Calculate names any left empty.

Massachusetts rules this calculator enforces: state estate tax YES (M.G.L. c. 65C, Form M-706): $2,000,000 exemption for deaths on or after January 1, 2023 with the cliff eliminated by a credit equal to the schedule tax on $2,000,000 ($178,320), graduated rates 0.8% to 16% on the excess; NO portability of the Massachusetts exemption (federal DSUE only); no inheritance tax; no gift tax; common-law (equitable distribution) state, not community property; spousal elective share of $25,000 outright plus one-half of the remaining personal property, held as a life interest where the decedent left issue (M.G.L. c. 191 s.15; VERIFY); voluntary administration small-estate procedure where personal property is $25,000 or less, excluding one vehicle (M.G.L. c. 190B s.3-1201; VERIFY); probate venue in the Probate and Family Court of the county of domicile (14 counties).
Federal: unified estate and gift schedule topping at 40%; basic exclusion $13,610,000 (2024), $13,990,000 (2025), $15,000,000 (2026); federal portability (DSUE) allowed; unlimited marital and charitable deductions; GST 40%.
Massachusetts exemption is static at $2,000,000 for deaths 2023 and later; federal exclusion varies by year.
Probate and Family Court venue; the estate tax is state-wide.Required. Please choose a Massachusetts county.
Select a county to see the Probate and Family Court venue, the voluntary administration threshold, and the federal and Massachusetts exemptions for the selected year.

Assets at date of death

Home, condo, land, rental buildings at fair market value.Enter 0 or a positive amount.
Checking, savings, CDs, stocks, bonds, mutual funds.Enter 0 or a positive amount.
IRAs, 401(k)s, 403(b)s, pensions, annuity contracts.Enter 0 or a positive amount.
Death benefit includible when the decedent held any incident of ownership.Enter 0 or a positive amount.
Closely held business, vehicles, equipment, receivables, trusts includible in the estate.Enter 0 or a positive amount.
Massachusetts is a common-law (equitable distribution) state, not community property, so no community-property halving or double step-up applies.

Debts and administration costs

Deductible obligations of the decedent.Enter 0 or a positive amount.
Deductible when paid by the estate.Enter 0 or a positive amount.
Deductible administration expense.Enter a percentage between 0 and 25.
Filing fees, publication, appraisal costs.Enter 0 or a positive amount.
Deductible if not compensated by insurance.Enter 0 or a positive amount.

Bequests and marital status

Unlimited marital deduction for a citizen spouse or a QDOT (federal and Massachusetts).Enter 0 or a positive amount.
Unlimited deduction for qualifying charities.Enter 0 or a positive amount.

Prior gifts, portability and GST

Post-1976 taxable gifts; they count toward the federal exclusion and the Massachusetts base. Massachusetts has no gift tax.Enter 0 or a positive amount.
Federal portability only; Massachusetts does NOT port its $2,000,000 exemption.Enter 0 or a positive amount.
Federal GST at a flat 40% on Form 706 Schedule R.Enter 0 or a positive amount.
Equals the federal basic exclusion for the year of death.Enter 0 or a positive amount.

Gifting plan

Required in gifting mode. Annual-exclusion gifts are not taxable gifts.Required in gifting mode. Enter 1 or more donees.
Amounts above the annual exclusion become taxable gifts.Enter 0 or a positive amount.
Gifts carry over basis and lose the step-up at death.Enter 0 or a positive amount.
Massachusetts’s low $2,000,000 exemption can require many years; raise this if needed.Enter a whole number between 1 and 200.

How it works

  • Massachusetts has its own estate tax. For deaths on or after January 1, 2023 the exemption is $2,000,000 and the pre-2023 cliff is gone: tax equals the graduated 0.8% to 16% schedule on the Massachusetts base less a credit equal to the schedule tax on $2,000,000 ($178,320), filed on Form M-706. Estates at or below $2,000,000 owe $0 to Massachusetts.
  • No Massachusetts portability. A surviving spouse cannot inherit the unused Massachusetts exemption; only the federal DSUE ports. Credit-shelter planning matters in Massachusetts.
  • Federal estate tax also applies above the federal basic exclusion using the unified 18% to 40% schedule; the federal GST applies at 40% to direct skips above the allocated GST exemption.
  • No community property. Massachusetts is a common-law state, so no halving of community assets and no double basis step-up.
  • Elective share. A surviving spouse may elect $25,000 outright plus one-half of the remaining personal property, held as a life interest where the decedent left issue (M.G.L. c. 191 s.15; VERIFY); the calculator shows the nominal amount capped at the net estate.
  • Small estates. Voluntary administration under M.G.L. c. 190B s.3-1201 is available where personal property is $25,000 or less (one vehicle excluded); verify the current figure.
  • Binding factor names what controls the result: the Massachusetts $2,000,000 exemption, the federal exclusion, the federal unified schedule, or the GST.
  • Gifting mode uses the guarded bisection solver (60 expansions, 90 iterations, rounded up). Because the Massachusetts exemption is only $2,000,000, eliminating all tax usually requires many decades of annual-exclusion gifting — the calculator reports this honestly.
  • Gifting is not free. Carryover basis loses the step-up; the deferred gain is netted against the tax saved.

Sources

  • M.G.L. c. 65C and Form M-706 (Massachusetts estate tax: $2,000,000 exemption and cliff elimination for deaths on or after January 1, 2023; graduated 0.8% to 16% schedule with a credit equal to the tax on the exemption); Massachusetts Department of Revenue guidance.
  • M.G.L. c. 191 s.15 (spousal elective share: $25,000 outright plus one-half of remaining personal property, life interest where issue survive; VERIFY); M.G.L. c. 190B s.3-1201 et seq. (voluntary administration small-estate procedure, $25,000 personal property limit excluding one vehicle; VERIFY); Probate and Family Court venue by county (14 counties).
  • IRC chapter 11 unified schedule and exclusion ($13,610,000 / $13,990,000 / $15,000,000 for 2024 / 2025 / 2026); IRC 2010 portability; IRC 2042 life insurance inclusion; IRC 2055 charitable deduction; IRC chapter 13 GST at 40%; IRC 1014 step-up and 1015 carryover basis.
  • IRS Form 706 and Form 4768 instructions (9-month deadline, 6-month filing extension); Massachusetts Form M-4768 for state extension (VERIFY).

Test cases

TC1 – Below both exemptions. Middlesex, 2025, single. Real 1,000,000; financial 500,000; retirement 300,000; debts 150,000; funeral 12,000; atty 2%; court 400.
Gross 1,800,000; admin 33,400; deductions 195,400; net estate 1,604,600; TE 1,604,600 at or below 2,000,000 MA and 13,990,000 federal. Federal $0, Massachusetts $0, TOTAL $0. MA headroom 395,400; federal headroom 12,385,400; ceiling 2,195,400.
TC2 – Above MA exemption, below federal. Suffolk, 2025, single. Real 4,000,000; financial 2,000,000; retirement 1,000,000; debts 300,000; funeral 20,000; atty 2%; court 400.
Gross 7,000,000; admin 134,400; deductions 454,400; net estate 6,545,600; TE 6,545,600. MA schedule 841,616 less credit 178,320 = MASSACHUSETTS 663,296. Federal $0. TOTAL 663,296. Effective 9.48%.
TC3 – Above both, marital + federal DSUE (no MA portability). Norfolk, 2025, married, citizen, issue, bequest 6,000,000, federal DSUE 2,000,000. Real 15,000,000; financial 7,000,000; life 3,000,000; debts 400,000; funeral 25,000; atty 2%; court 400.
Gross 25,000,000; admin 492,400; deductions 917,400; net estate 24,082,600; less marital 6,000,000 = TE 18,082,600. MA schedule 2,687,536 less credit 178,320 = MASSACHUSETTS 2,509,216. Federal exclusion 15,990,000; FEDERAL 837,040. TOTAL 3,346,256. Effective 13.39%. Elective share 5,012,500 (life interest if issue).
TC4 – Gifting solver, 2026, maxYears 200. Worcester, single. Real 6,000,000; financial 4,000,000; retirement 2,000,000; business 1,000,000; debts 300,000; funeral 15,000; atty 2%; court 400; 4 donees at 19,000.
Gross 13,000,000; admin 254,400; deductions 569,400; net estate 12,430,600; TE 12,430,600. Federal $0 (below 15,000,000); MA schedule 1,783,216 less credit 178,320 = 1,604,896; TOTAL 1,604,896. Solver must reach the LOWER MA exemption 2,000,000: 76,000/yr requires 138 YEARS (removes 10,488,000 leaving TE 1,942,600), tax $0. Saved 1,604,896.
TC5 – Small estate, voluntary administration. Bristol, 2025, married 5 years, citizen, issue. Financial 15,000; retirement 5,000; debts 1,500; funeral 3,000; atty 2%; court 300.
Gross 20,000; admin 670; deductions 5,170; net estate 14,830; TE 14,830 at or below both exemptions. Federal $0, Massachusetts $0, TOTAL $0. Voluntary administration available (personal property 20,000 at or below 25,000). Elective share capped at net estate = 14,830.

Estimates only. Not legal, tax or financial advice. The Massachusetts elective share and voluntary administration figures are flagged for verification against M.G.L. c. 191 and c. 190B. Verify all figures with the Massachusetts Department of Revenue and federal rules before relying on them.

What Is the Massachusetts Estate Tax Calculator?

The Massachusetts estate tax calculator estimates total transfer tax by combining the calculator’s federal estate tax, Massachusetts estate tax, and federal GST calculations. It starts with estate assets, subtracts modeled deductions and bequests, adds prior taxable gifts to the tax bases, then applies the exclusions, credits, rates, and other assumptions encoded in the tool.

You can enter real property, financial accounts, retirement assets, life insurance, business and personal property, debts, funeral costs, administration expenses, losses, spousal and charitable bequests, prior gifts, DSUE, and direct skips. A Massachusetts county is also required so the calculator can display the Probate and Family Court venue.

The results are estimates. They depend on the values entered and the rules built into the calculator. The calculator itself flags its elective-share and voluntary-administration figures for verification and does not replace Form 706, Form M-706, professional valuation, or individual legal and tax advice.

How the Massachusetts Estate Tax Calculation Works

The first step is to total the five asset categories. The calculator then works out administration costs and subtracts debts, funeral expenses, administration costs, and casualty or theft losses to obtain its net estate figure.

Gross Estate=Real Property+Financial Assets+Retirement Assets+Life Insurance+Business and Other Property\text{Gross Estate}=\text{Real Property}+\text{Financial Assets}+\text{Retirement Assets}+\text{Life Insurance}+\text{Business and Other Property}
Administration Costs=max⁡(Gross Estate−Debts,0)×Fee Percentage100+Court Costs\text{Administration Costs}=\max(\text{Gross Estate}-\text{Debts},0)\times\frac{\text{Fee Percentage}}{100}+\text{Court Costs}
Net Estate=max⁡(Gross Estate−Debts−Funeral−Administration Costs−Losses,0)\text{Net Estate}=\max(\text{Gross Estate}-\text{Debts}-\text{Funeral}-\text{Administration Costs}-\text{Losses},0)

The marital deduction is allowed only when the decedent is marked as married and the surviving spouse is a U.S. citizen or the bequest is marked as passing to a QDOT. The deduction is capped at the net estate. The charitable deduction is then capped at what remains after the marital deduction.

Taxable Estate=max⁡(Net Estate−Marital Deduction−Charitable Deduction−Gift Reduction,0)\text{Taxable Estate}=\max(\text{Net Estate}-\text{Marital Deduction}-\text{Charitable Deduction}-\text{Gift Reduction},0)

Earlier taxable gifts are added to the resulting taxable estate for both the federal and Massachusetts bases.

Tax Base=Taxable Estate+Earlier Taxable Gifts\text{Tax Base}=\text{Taxable Estate}+\text{Earlier Taxable Gifts}

For the supported years, the federal applicable exclusion equals the selected year’s basic exclusion plus any DSUE entered. The calculator uses $13,610,000 for 2024, $13,990,000 for 2025, and $15,000,000 for 2026. Because each supported exclusion lies above the top threshold of the encoded federal schedule, the implemented federal result when tax is due is equivalent to:

Federal Estate Tax=0.40×max⁡(Federal Base−Federal Applicable Exclusion,0)\text{Federal Estate Tax}=0.40\times\max(\text{Federal Base}-\text{Federal Applicable Exclusion},0)

For Massachusetts, the calculator evaluates its full graduated schedule on the Massachusetts base and subtracts the schedule tax on $2,000,000. That credit is $178,320 in the code. The result cannot fall below zero.

Massachusetts Estate Tax=max⁡(SMA(BMA)−178,320,0)\text{Massachusetts Estate Tax}=\max\left(S_{MA}(B_{MA})-178{,}320,0\right)

Here, SMA is the calculator’s progressive Massachusetts schedule and BMA is the taxable estate plus earlier taxable gifts. The encoded schedule begins at 0.8% and reaches 16%. For a base above $2,000,000, subtracting the credit removes the schedule tax attributable through the $2,000,000 exemption.

Federal GST tax is calculated separately from direct skips.

GST Tax=0.40×max⁡(Direct Skips−GST Exemption Allocated,0)\text{GST Tax}=0.40\times\max(\text{Direct Skips}-\text{GST Exemption Allocated},0)
Total Transfer Tax=Federal Estate Tax+Massachusetts Estate Tax+GST Tax\text{Total Transfer Tax}=\text{Federal Estate Tax}+\text{Massachusetts Estate Tax}+\text{GST Tax}

Worked Example

Consider a hypothetical 2025 estate with $4,000,000 of real property, $2,000,000 in financial accounts, and $1,000,000 in retirement assets. Assume $300,000 of debts, $20,000 of funeral expenses, a 2% attorney and fiduciary fee, and $400 of probate costs.

The gross estate is $7,000,000. Administration costs are ($7,000,000 − $300,000) × 2% + $400 = $134,400. Total modeled deductions are $454,400, leaving a net and taxable estate of $6,545,600 when no marital deduction, charitable deduction, gifting, or prior taxable gifts apply.

The Massachusetts schedule tax on $6,545,600 is $841,616. Subtracting the calculator’s $178,320 Massachusetts credit gives $663,296 of Massachusetts estate tax. The estate remains below the calculator’s 2025 federal exclusion, so federal estate tax is $0. With no GST tax, total transfer tax is $663,296, displayed as an effective rate of 9.48% of the gross estate.

How to Use the Massachusetts Estate Tax Calculator

  1. Choose estate-tax mode, larger-estate headroom mode, or the gifting-years solver.
  2. Select a year of death: 2024, 2025, or 2026.
  3. Select the Massachusetts county of domicile for the displayed Probate and Family Court venue.
  4. Enter real property, financial accounts, retirement assets, owned life insurance, and business or other property.
  5. Enter debts, funeral expenses, the attorney and fiduciary fee percentage, probate costs, and casualty or theft losses.
  6. Complete the marital-status, spousal-bequest, charitable-bequest, prior-gift, DSUE, and GST fields that apply.
  7. For gifting analysis, enter the donee count, gift per donee, embedded gain, capital-gains rate, NIIT choice, and maximum years to test.
  8. Check the required acknowledgment and select the calculation button.

Estate mode displays total modeled transfer tax. Headroom mode reports a verdict plus remaining federal and Massachusetts headroom and a model-specific tax-free ceiling. Gifting mode searches for the first whole number of years, within the maximum you entered, that brings total modeled transfer tax to zero.

Understanding the Calculator’s Results and Assumptions

Annual-Exclusion Gifting

The calculator uses an annual exclusion of $18,000 per donee for 2024 and $19,000 for 2025 and 2026. The amount that reduces the estate each year is capped at the applicable exclusion, even if the entered gift per donee is higher.

Gift Reduction=min⁡(Gift per Donee,Annual Exclusion)×Donees×Years\text{Gift Reduction}=\min(\text{Gift per Donee},\text{Annual Exclusion})\times\text{Donees}\times\text{Years}

In gifting mode, the donee field must contain a value, but the implemented numeric range permits 0 through 200. The maximum-years field is bounded from 1 through 200. The solver repeatedly tests gifting periods and rounds the required result up to a whole year.

Carryover-Basis Estimate

The gifting analysis also estimates deferred capital gains from the unrealized gain entered by the user. It multiplies that gain by the selected 0%, 15%, or 20% long-term capital-gains rate. If the NIIT checkbox is selected, the calculator adds 3.8 percentage points. It then subtracts this modeled basis cost from transfer-tax savings to show a net-benefit figure.

Deferred Gain Cost=Unrealized Gain×(Selected Capital Gains Rate+NIIT Adjustment)\text{Deferred Gain Cost}=\text{Unrealized Gain}\times(\text{Selected Capital Gains Rate}+\text{NIIT Adjustment})

Elective Share and Voluntary Administration

For a married decedent, the calculator models the elective share as $25,000 plus one-half of personal property above $25,000, capped at the calculated net estate. Its personal-property total consists of financial accounts, retirement assets, life insurance, and business or other property. The descendants checkbox changes the explanatory life-interest note but does not change the numerical elective-share calculation.

The voluntary-administration flag is true when those same non-real-property categories total $25,000 or less. Real property is excluded from that test. Although the calculator’s text refers to one vehicle being excluded, the code has no separate vehicle-value field or additional vehicle subtraction in this test.

Headroom, Filing Flags, and Rates

Federal headroom equals the remaining federal applicable exclusion after the federal base. Massachusetts headroom equals the remaining amount under $2,000,000. The displayed tax-free ceiling adds the smaller headroom amount to the current gross estate.

The calculator flags federal Form 706 when its federal base exceeds the applicable federal exclusion. It flags Massachusetts Form M-706 when its Massachusetts base exceeds $2,000,000. Its filing-deadline output states nine months after death and notes a six-month federal filing extension.

The displayed effective transfer-tax rate is total transfer tax divided by gross estate and is shown to two decimal places. The separate marginal-rate output is a simplified indicator: 16% when only Massachusetts estate tax applies, 40% when only federal estate tax applies, and 56% when both apply. It does not display the exact current Massachusetts marginal bracket.

Currency outputs are rounded to the nearest whole dollar. Most monetary input fields accept values from $0 through $100,000,000. The attorney and fiduciary fee field accepts 0% through 25%.

Estate Tax Calculators for All 50 U.S. States

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Frequently Asked Questions

How does the calculator determine Massachusetts estate tax?

It applies its graduated Massachusetts schedule to the taxable estate plus earlier taxable gifts, then subtracts $178,320, which is the encoded schedule tax on $2,000,000. If the Massachusetts base is at or below $2,000,000, the calculator reports $0 of Massachusetts estate tax.

Does federal DSUE increase the Massachusetts exemption?

No. DSUE entered in the calculator increases only the federal applicable exclusion. The Massachusetts exemption remains $2,000,000 in every supported year. The calculator displays Massachusetts portability as not allowed.

Does choosing a different Massachusetts county change the tax?

No. County selection does not change the tax formulas. It is used to display the Probate and Family Court venue. The estate-tax calculations use the same Massachusetts rules regardless of which of the 14 listed counties is selected.

How are attorney and fiduciary fees calculated?

The code subtracts debts from gross estate, with a minimum of zero, and applies the entered fee percentage to that amount. It then adds the entered probate filing and other costs. This implemented formula is more specific than the field label’s general reference to a percentage of the net estate.

How does the gifting solver find the required number of years?

It caps each donee’s annual estate reduction at the calculator’s annual-exclusion amount, multiplies by the number of donees, and tests increasing gifting periods. It then uses a numerical search to find the point where modeled total transfer tax reaches zero and rounds that result up to a whole year.

Does the calculator include federal generation-skipping transfer tax?

Yes. It subtracts the GST exemption amount entered from direct skips and applies a 40% rate to any positive remainder. The GST exemption input defaults to $0, so it must be entered by the user when applicable; the calculator does not automatically copy the year’s federal basic exclusion into that field.

Are the calculator’s results exact estate-tax figures?

No. They are estimates produced from the calculator’s encoded rules and the user’s inputs. Actual tax filings, property values, deductible expenses, marital treatment, probate procedures, and other legal or tax factors may differ. The tool specifically marks its elective-share and voluntary-administration figures for verification.

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