Determination engine

Which state do you actually withhold in?

Reciprocity, convenience-of-the-employer, nonresident thresholds and unemployment localization, applied together to one employee's facts. Every answer cites the state source it came from.

Withhold Massachusetts income tax.

New Hampshire residents get no exemption from Massachusetts tax, so the work state governs.

Income tax withheld to

Massachusetts

Graduated, top rate 9%

Employee certificate

M-4

Massachusetts Employee's Withholding Exemption Certificate

Unemployment insurance

Massachusetts

Localized under factor 1: Localization.

Reciprocal agreement

Massachusetts has no reciprocal agreements.

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Withhold Massachusetts nonresident income tax

Massachusetts taxes wages earned inside the state by nonresidents, and no reciprocal agreement covers New Hampshire residents. Massachusetts requires withholding from the first dollar of in-state wages.

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Massachusetts paid family and medical leave contributions

Massachusetts PFML 2026 total contribution is 0.88% of eligible wages up to the Social Security wage base. Employees pay up to 0.18% for family leave and up to 0.28% for medical leave (0.46% combined); employers with 25+ covered individuals pay the remaining 0.42% of medical leave. Employee contribution: 0.46%. These follow the state of unemployment coverage, not the income tax state.

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Employer registrations you will need

Massachusetts — Income tax withholding: Massachusetts Department of Revenue
Massachusetts — Unemployment insurance: Massachusetts Department of Unemployment Assistance (DUA)

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Get the form

M-4 — Massachusetts (official state source)

Massachusetts profile New Hampshire profile Full write-up for this pair

Change the inputs

Withholding determination

Answer six questions. The result is a shareable link, so you can paste it into a ticket or an email.

Employee lives inState of residence

Work is performed inWhere the employee physically sits

Employer is based inWhere the work is directed from

Days in the work stateThis calendar year, leave blank if unknown

Wages from work-state daysUS dollars, leave blank if unknown

Arrangement Works remotely rather than at an employer location Remote work is an employer necessity, not employee preference

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This is a determination aid, not advice. StateSide encodes published state rules and applies them mechanically to the facts you enter. It does not know your entity structure, your nexus history, your equity compensation, or the dozens of exceptions that turn a clean rule into a judgement call. Every determination cites the state source it came from — verify against that source, and take anything consequential to a payroll tax professional before you act on it.