Massachusetts Tax Withholding: Rates, Form M-4, and Penalties

Massachusetts tax withholding runs on a flat 5% state income tax rate, with an added 4% surtax on income above roughly $1.1 million. Employers deduct the tax from each paycheck based on the exemptions the employee claims on Form M-4, then remit the money to the Department of Revenue (DOR) on a schedule the agency assigns based on how much withholding the business handles in a year. The amounts withheld become credits on the employee’s annual state return.

The Rate and the Surtax

The base rate is 5% on wages, salaries, tips, and most other earned income.¹ Starting with tax year 2023, an additional 4% surtax applies to taxable income above an inflation-adjusted threshold. For 2026, that threshold is $1,107,750, so income above that amount is effectively taxed at 9%.² The DOR’s Circular M withholding tables build the surtax into the percentage method calculations, so no separate surtax math is required at the payroll stage.³

One boundary worth flagging: certain capital gains are taxed at 8.5%, but that liability isn’t handled through payroll. Employees with significant investment income may need to make separate estimated payments to avoid an underpayment penalty.⁴

Form M-4 Sets the Withholding Amount

Every Massachusetts employee should file Form M-4, the state’s Withholding Exemption Certificate, with their employer. The form tells the employer how many exemptions to use when calculating each paycheck deduction. More exemptions mean less tax withheld. An employee who never files an M-4 gets withholding calculated at zero exemptions, which pulls the maximum amount from every check.⁵

Available exemptions include a personal exemption, one for a spouse, and exemptions for dependents. These are separate from anything claimed on the federal W-4, so filing one does not cover the other. Employees who expect to owe more than standard withholding covers can request a flat additional dollar amount be withheld from each check by noting it on the M-4.⁵

Box D on the form is a specific exemption for full-time students working seasonally or part-time whose estimated annual income won’t exceed $8,000. Checking it stops Massachusetts income tax withholding entirely. Claiming more exemptions than you’re entitled to can trigger civil and criminal penalties, so the form is not something to fill out carelessly.⁵

When a change in your situation reduces the number of exemptions you’re entitled to, you have 10 days to file a new M-4. The classic example is losing a dependent, such as a child who earns enough that you no longer provide more than half their support. You can always file a new M-4 voluntarily when exemptions go up, but the 10-day deadline only applies when they go down.⁵

How Employers Calculate the Deduction

The DOR publishes Circular M each year with the tables and formulas employers use. Two standard approaches exist. The wage bracket method uses lookup tables organized by pay period and number of exemptions: find the row for the wage range, cross-reference the exemptions column, and read off the withholding. This works well for smaller employers doing payroll by hand.⁶

The percentage method uses a formula. Payroll software typically runs this way. The employer subtracts the exemption value from gross wages for the pay period and applies 5% to the result. For pay above the annualized surtax threshold, the formula applies 9% to the excess. The DOR allows any calculation method that produces results “substantially equivalent” to the published tables.³

The tables already account for the standard deduction and personal exemptions, so employers don’t make separate adjustments for those. Getting the math wrong isn’t just the employee’s problem. Employers who under-withhold can be held personally liable for the shortfall, plus penalties and interest.⁶

Bonuses and Other Supplemental Wages

Because Massachusetts uses a flat rate, supplemental wages such as bonuses, commissions, and severance don’t require the special methods that apply at the federal level. The same 5% rate applies. An employer can add the bonus to the regular paycheck and withhold on the combined total using Circular M, or withhold a flat 5% on the bonus separately. Either approach produces the same effective rate for most employees. The exception is high earners above the surtax threshold, where the 9% rate on the excess pushes withholding higher on a large bonus.

Filing Frequency and Payment Deadlines

How often you file and pay depends on total annual withholding across all employees. The DOR assigns one of four frequencies:

Annual ($100 or less): One return and payment, due January 31 of the following year.
Quarterly ($101 to $1,200): Returns and payments due the last day of the month after each quarter (April 30, July 31, October 31, January 31).
Monthly ($1,201 to $25,000): Due by the 15th of the following month, except payments for March, June, September, and December, which are due the last day of the following month.
Accelerated (over $25,000): Quarterly returns, but payments must be deposited within three business days whenever accumulated withholding reaches $500 or more as of the 7th, 15th, 22nd, or last day of any month.

⁷

The return itself is Form M-941, filed at whatever cadence the DOR assigned you. Monthly filers submit it monthly; annual filers submit it once.⁸ All payments and filings go through MassTaxConnect. The DOR requires electronic filing and electronic funds transfer for withholding taxes regardless of frequency; paper checks and mailed returns are not accepted.⁹

Year-End Reconciliation

At year-end, employers must reconcile what they withheld with what they remitted. Two forms drive this.

Every employee gets a W-2 by January 31. Box 16 shows total Massachusetts taxable wages, and Box 17 shows total state tax withheld. Those figures need to match internal payroll records and the M-941 filings made through the year.

The employer also files Form M-3, the annual reconciliation return, with the DOR. M-3 totals all state tax withheld and compares it against total M-941 payments. Form M-3 and Copy 1 of each employee’s W-2 are due on or before January 31.¹⁰ A mismatch between W-2 totals and M-3 figures is one of the fastest ways to trigger a DOR inquiry.

1099 Reporting for Contractors

No Massachusetts income tax is withheld on payments to independent contractors, but reporting rules still apply. If you pay a contractor $2,000 or more during the year (the 2026 federal threshold), you must file Form 1099-NEC with both the IRS and the Massachusetts DOR. The state deadline is January 31, and Massachusetts requires the 1099-NEC to be filed directly with the DOR even if you use the IRS Combined Federal/State Filing Program.¹¹ Misclassifying an employee as a contractor exposes the business to back taxes, penalties, and liability for unpaid benefits.

Nonresidents and Remote Workers

Massachusetts taxes nonresidents on compensation for services physically performed within the state. A New Hampshire resident who commutes to a Boston office has Massachusetts tax withheld on those wages.¹² Massachusetts has no reciprocity agreements with neighboring states, so a nonresident employee can’t opt out of Massachusetts withholding and pay only their home state.

Under current rules, Massachusetts does not tax nonresidents on work performed while telecommuting from outside the state. A remote employee who never physically works in Massachusetts generally has no Massachusetts withholding obligation on those wages.

For employees who split time between Massachusetts and another state, employers typically apportion wages by days worked in each location and withhold Massachusetts tax only on the Massachusetts portion. The employee usually claims a credit on their home-state return for taxes paid to Massachusetts, which prevents double taxation.

Penalties and Personal Liability

The DOR treats withholding compliance as a priority, and the penalties stack:

Late payment: 1% of unpaid tax per month (or fraction of a month), up to 25%.
Failure to deposit: 5% of the underpayment when a required deposit is missed.
Interest: The annual rate is the federal short-term rate plus four points, compounding on any outstanding balance.

¹³

Beyond money penalties, Massachusetts law creates personal criminal exposure for employers who fail to withhold or remit after receiving notice from the DOR. Once the DOR delivers a hand-served notice of noncompliance, the employer must deposit all future withholdings into a special trust account at a Massachusetts bank within two banking days. For corporations, partnerships, and trusts, notice served on any officer, partner, or trustee counts as notice to the entity and its responsible individuals. Failure to comply after notice carries a fine of $100 to $5,000, up to one year of imprisonment, or both.¹⁴

Cash flow is not a defense. The statute expressly says a lack of funds immediately after paying wages is not a circumstance beyond the employer’s control. Withholding is trust fund money that belongs to the state from the moment it comes out of the paycheck. Treating it as operating cash is one of the most common mistakes small businesses make, and the DOR pursues it aggressively.¹⁴

1
Massachusetts Department of Revenue. Massachusetts Tax Rates
2
Massachusetts Department of Revenue. Massachusetts 4% Surtax on Taxable Income
3
Mass.gov. Massachusetts Circular M Income Tax Withholding Tables at 5.0% Effective January 1, 2026
4
Massachusetts Department of Revenue. Personal Income Tax for Residents
5
Mass.gov. Massachusetts Employee’s Withholding Exemption Certificate Form M-4
6
Cornell Law School. 830 CMR 62B.2.1 – Withholding of Taxes on Wages and Other Payments
7
Massachusetts Department of Revenue. Withholding Taxes on Wages
8
Mass.gov. Form M-941 Instructions for Tax Return of Income Taxes Withheld
9
Massachusetts Department of Revenue. DOR E-Filing and Payment Requirements
10
Massachusetts Department of Revenue. Form M-3 Reconciliation of Massachusetts Income Taxes Withheld for Employers
11
Massachusetts Department of Revenue. Massachusetts Form 1099 Filing Requirements
12
Mass.gov. 830 CMR 62.5A.1 Non-Resident Income Tax
13
Massachusetts Department of Revenue. Massachusetts Tax Penalty Rates
14
General Court of Massachusetts. General Law Part I, Title IX, Chapter 62B, Section 7