Massachusetts Estimated Tax Payments: Due Dates and Safe Harbors

If you expect to owe Massachusetts more than $400 in income tax after subtracting withholding and credits, you have to make Massachusetts estimated tax payments in four quarterly installments. For 2026, they are due April 15, June 16, September 15, and January 15, 2027. Miss one and the Department of Revenue charges interest on the shortfall plus a flat 1% penalty for each month the payment is late.

Who Has To Pay

The obligation kicks in when you have income that isn’t subject to Massachusetts withholding and your projected state tax bill, minus any withholding and credits, tops $400 for the year.¹ The income types that typically push people over the line: self-employment earnings, rental income, dividends, capital gains, and certain retirement distributions.

People with a regular W-2 job often assume estimated payments don’t apply to them. That can be a mistake in years with meaningful side income or investment gains. Run the numbers: estimate your total Massachusetts tax, subtract what your employer will withhold, subtract credits you expect to claim, and if what’s left is more than $400, you owe quarterly payments.

2026 Quarterly Due Dates

First quarter: April 15, 2026
Second quarter: June 16, 2026
Third quarter: September 15, 2026
Fourth quarter: January 15, 2027

The second installment falls on June 16, not June 15 as the federal schedule usually shows.² If any due date lands on a weekend or legal holiday, the deadline shifts to the next business day. Each installment generally covers one-quarter of your total estimated tax, though you can adjust individual payments when your income arrives unevenly.

Calculating What You Owe Each Quarter

The Department of Revenue publishes Form 1-ES, which contains a worksheet that walks through the full calculation.³ The core steps are the same each year: estimate income from every source, subtract deductions and exemptions to reach Massachusetts adjusted gross income, apply the tax rate, then subtract credits.

For 2026, Massachusetts taxes most income at a flat 5%.⁴ Short-term capital gains on assets held a year or less are taxed at 8.5%, and long-term gains on certain collectibles and pre-1996 installment sales at 12%.⁵ If you sold investments during the year, separate your gains by holding period before applying rates.

Credits reduce the estimated tax you owe. Massachusetts offers several, including the Earned Income Tax Credit and the Senior Circuit Breaker Credit, which refunds a portion of property taxes or rent paid by qualifying residents age 65 and older.⁶ Whatever remains after credits is your net estimated tax. Divide by four for the standard quarterly payment.

The 4% Surtax on Higher Incomes

Massachusetts adds a 4% surtax on the portion of taxable income above an inflation-adjusted threshold. For tax year 2025 the threshold was $1,083,150; the 2026 figure had not been published at the time of this writing, but expect another inflation increase.⁷

If your combined wages, business profits, and gains might cross the threshold, build the extra 4% into your quarterly calculation. The DOR treats the surtax as part of the tax due when it evaluates whether you underpaid, so ignoring it produces a real underpayment penalty at filing. One procedural point: everyone subject to the surtax must file and pay electronically. Paper checks aren’t an option in that situation.⁷

Safe Harbors That Prevent Penalties

You can avoid an underpayment penalty by hitting either of two safe harbor amounts. Your combined payments (estimates plus withholding) need to equal at least 80% of the tax you actually owe for the current year, or 100% of the tax on last year’s return, whichever is less.⁸

The prior-year method is the easier one for most people whose income moves around. Take last year’s Massachusetts tax, divide by four, and pay that. Whatever your actual income does this year, you’re protected from the underpayment penalty.

What Missing a Payment Actually Costs

Two separate charges apply when estimated payments come up short or arrive late: an interest-based underpayment penalty and a flat late-payment penalty.

The underpayment penalty is interest on the amount you should have paid. The rate is the federal short-term rate plus four percentage points, compounded daily. The DOR set that rate at 8% for the first quarter of 2026 and 7% for the second quarter.⁹ Because the rate adjusts each quarter, your total charge depends on how much you underpaid and how long the shortfall sat.

On top of the interest, Massachusetts charges 1% of the unpaid tax for each month or fraction of a month the payment is late, capped at 25%.¹⁰ Being one day into a new month costs the same as being 29 days into it: a full extra point.

How To Submit Payment

Two channels are available, and the DOR prefers the online one for speed and recordkeeping.

MassTaxConnect

MassTaxConnect is the DOR’s online portal. You can schedule payments ahead of time, view your history, and get immediate confirmation of each transaction.¹¹ It’s the only option for anyone subject to the 4% surtax. For everyone else, the tracking makes it easier to prove a payment was timely if the DOR later says otherwise.

Mail

To pay by check or money order, make it payable to the Commonwealth of Massachusetts and write your Social Security number in the lower left corner. Include the voucher from Form 1-ES and mail to:¹²

Massachusetts Department of Revenue
PO Box 419540
Boston, MA 02241-9540

The envelope must be postmarked by the quarterly due date. Keep a copy of the voucher and the canceled check or bank statement.

Adjusting for Uneven Income

Equal quarterly installments assume steady income. That doesn’t fit a landscaper earning most of the year’s revenue between April and October, or an investor who realizes a big gain in December. Massachusetts permits the annualized income installment method, which recalculates the required payment for each quarter based on income actually earned during that period. If your annualized tax for a given quarter falls below the standard one-quarter installment, you can pay the smaller amount, and the difference gets caught up in later installments as income comes in.⁸

If your projections change mid-year, Form 1-ES includes an Amended Computation Worksheet. Recalculate the remaining installments and submit the revised voucher with your next payment.³ Waiting until the annual return to discover the underpayment means the interest and 1% monthly penalty have already been running.

Asking for a Waiver

If a payment was late for reasons outside your control, you can ask the DOR to waive the penalty. The standard is reasonable cause, not willful neglect. Submit a written statement of the facts; the Commissioner may require you to sign it under penalties of perjury.¹³

For an original return, attach a cover letter requesting the waiver to the front of the return. If the penalty has already been assessed, dispute it through MassTaxConnect or file a paper Form ABT (Application for Abatement). The DOR generally expects the underlying tax and interest to be paid before it considers the waiver.¹³

Don’t Forget the Federal Piece

If you owe Massachusetts estimated payments, you almost certainly owe federal ones too. The federal safe harbor is stricter: 90% of the current year’s tax, or 100% of last year’s (110% if your adjusted gross income exceeded $150,000). The quarterly due dates line up closely enough that most people write both checks the same day.

Self-employed taxpayers carry an extra federal load. On top of income tax, self-employment tax runs 15.3% on net earnings, made up of Social Security (12.4% on earnings up to $184,500 in 2026) and Medicare (2.9% on all earnings).¹⁴¹⁵ Massachusetts has no separate self-employment tax, but the federal obligation means your real quarterly cash requirement is usually well above the state figure alone. Plan for both.

1
General Court of Massachusetts. Massachusetts General Laws Chapter 62B, Section 13 – Amount of Estimated Tax
2
Massachusetts Department of Revenue. Massachusetts DOR Estimated Tax Payments
3
Mass.gov. 2026 Form 1-ES Estimated Tax Payment Vouchers, Instructions and Worksheets
4
Mass.gov. Massachusetts Circular M – Income Tax Withholding Tables at 5.0% Effective January 1, 2026
5
General Court of Massachusetts. Massachusetts General Laws Chapter 62, Section 4
6
Mass.gov. Massachusetts Senior Circuit Breaker Tax Credit
7
Mass.gov. Massachusetts 4% Surtax on Taxable Income
8
General Court of Massachusetts. Massachusetts General Laws Chapter 62B, Section 14 – Underpayment of Estimated Tax
9
Massachusetts Department of Revenue. TIR 26-2: Interest Rate On Overpayments And Underpayments
10
General Court of Massachusetts. Massachusetts General Laws Chapter 62C, Section 33
11
Massachusetts Department of Revenue. Making Payments in MassTaxConnect
12
Mass.gov. Mailing Addresses for Massachusetts Tax Forms
13
Massachusetts Department of Revenue. AP 633: Guidelines for the Waiver and Abatement of Penalties
14
Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)
15
Social Security Administration. Contribution and Benefit Base