Before you start

Massachusetts residence
Income information for subsidy or MassHealth eligibility
An SSN or ITIN for Health Connector applications
Awareness of the 63-day deadline from becoming a resident

Step-by-step

1
Work out when your 63 days start and end
The mandate applies to people who become Massachusetts residents within 63 days. A lapse of 63 consecutive days or less does not trigger a penalty, but longer does. If you arrive mid-month and your employer coverage starts the first of the following month, check the arithmetic rather than assuming you are fine.
OnlineWho: YouFirst week
2
Enrol in your employer's plan and check it meets MCC
Most employer plans meet Minimum Creditable Coverage, but not all do — particularly thin or short-term plans. The standard is specific to Massachusetts, and a plan that satisfies the federal rules can still fall short here. Ask HR directly whether the plan is MCC-compliant.
Via employerWho: YouFirst 30 days of employment
3
Without an employer plan, use the Massachusetts Health Connector
Massachusetts runs its own exchange, the original one that predates the ACA. Open enrolment for 2026 plans ran from 1 November 2025, and the Connector typically operates a longer window than federally-run states.
OnlineWho: You
4
Check MassHealth eligibility first
Massachusetts expanded Medicaid and MassHealth covers a broad population. There is also ConnectorCare, a subsidised tier unique to Massachusetts that sits between MassHealth and unsubsidised marketplace plans, with lower premiums and cost-sharing than standard subsidised plans elsewhere.
OnlineWho: You
5
Register with a primary care physician
Your PCP gates specialist access in most plans, and in Boston — where the teaching hospitals are world-class and heavily oversubscribed — finding one accepting new patients can take months. Start this in your first weeks, not when you are ill.
OnlineWho: You
6
Learn the urgent care versus emergency room distinction
An ER visit for something a clinic could treat can cost thousands even with insurance. Urgent care handles fractures, stitches and infections much more cheaply. In a city with several major academic emergency departments, it is tempting to default to them — don't.
In personWho: You

Documents you’ll need

Proof of Massachusetts residence
Income documentation for subsidies, ConnectorCare or MassHealth
SSN or ITIN
Immigration documents for Health Connector eligibility categories
Form MA 1099-HC from your insurer, which you need to file your state return

Things most newcomers don’t know

The 63-day rule is a real deadline with a real penalty.

Massachusetts applies its individual mandate to people who become residents within 63 days, and a gap longer than 63 consecutive days triggers a penalty assessed through your state income tax return, capped at 50% of the lowest monthly premium you would have qualified for. No other state in this app has this. It is the one health-insurance task here that cannot wait.

Source: Massachusetts Health Connector — individual mandate

Minimum Creditable Coverage is a Massachusetts-specific standard.

A plan can satisfy federal requirements and still fail the state's Minimum Creditable Coverage test — thin plans, some short-term policies and certain out-of-state employer plans are the usual culprits. Ask HR explicitly whether your plan is MCC-compliant, because failing it means the mandate penalty applies even though you thought you were insured.

Source: Mass.gov — health care reform for individuals

ConnectorCare is better than what most states offer at the same income.

Massachusetts supplements federal subsidies with a state programme giving lower premiums and cost-sharing than a standard subsidised marketplace plan. If your income falls in the eligible band, coverage here is materially cheaper and better than the equivalent in Texas or Florida — one of the genuine advantages of the state.

Source: Massachusetts Health Connector

You need Form MA 1099-HC to file your state taxes.

Your insurer issues it in January and it evidences your compliance with the mandate. People who move mid-year sometimes receive it from a prior insurer to an old address and cannot file cleanly. Update your address with any insurer you leave behind.

Source: Mass.gov — health care reform for individuals

Common mistakes to avoid

Letting more than 63 days pass without coverage after becoming a resident.
Assuming an employer plan meets Minimum Creditable Coverage without checking.
Missing the 30-day new-hire enrolment window.
Not checking ConnectorCare eligibility because you assumed subsidised coverage is always poor.
Failing to obtain Form MA 1099-HC and being unable to evidence compliance at filing.

Some of this may be out of date. Spotted something inaccurate? Help us keep it right for the next newcomer.