Keep It and Rent It? Becoming a Landlord With the House You Are Leaving

A family relocating, upsizing or moving in with a partner often owns a house with a mortgage at a rate they will never see again. Selling gives up that rate; keeping the house and renting it out keeps it, and builds equity paid for by someone else. It can be a very good decision. It is also the moment an ordinary homeowner becomes a Massachusetts landlord, which is a regulated business with rules that do not care whether you meant to be one.

The short answer: renting out the house can work well when the rent comfortably covers the full cost of owning it, you are prepared to meet Massachusetts landlord law from the first tenant, and you have thought about the tax clock that starts when you move out. If any of the three is shaky, selling is usually the better choice.

The numbers: rent against the real cost of owning

Compare the likely rent with every cost, not only the mortgage payment:

Mortgage principal and interest, property tax and insurance. A landlord policy usually costs more than a homeowner's policy.
Maintenance and repairs. Tenants call about everything, and a landlord cannot leave the boiler until spring.
Vacancy: a month or two empty between tenants.
Management, if you hire it: commonly a percentage of the rent, plus fees for finding tenants.
Capital reserves: the roof, the heating system and the water heater will need replacing at some point.
The equity you leave in the house, which could be earning something elsewhere.

The calculator has a renting-it-out view for exactly this: put in the rent, the costs and the financing, and see the monthly cash flow. A house that only breaks even on the mortgage is often losing money once maintenance and vacancy are counted.

The capital gains clock starts when you move out

While a house is your home, the federal primary-residence exclusion lets you exclude up to $250,000 of gain, or $500,000 for a married couple, provided you owned and lived in it for two of the five years before the sale. Downsizing explains the basic rule.

Renting it out does not end the exclusion at once, but it starts a countdown. To keep it you must sell within about three years of moving out, while two of the previous five years were still years you lived there. Sell after that and the whole gain is taxable.

Two more points:

Depreciation taken, or allowed, while the house was rented is taxed on sale even when the exclusion applies.
A 1031 exchange becomes possible once the house is genuinely held as a rental, which changes the calculation for a long-term landlord. The 1031 exchange explains how, and how that interacts with the exclusion.

Massachusetts landlord law applies from the first tenant

The rules are the same for a small landlord with one house as for a building owner, and several carry heavy penalties:

The security deposit statute. A deposit may not exceed one month's rent, must be held in a separate interest-bearing account at a Massachusetts bank, and comes with a statement of condition, receipts and a strict process for returning it. Mistakes can cost several times the deposit. What it costs to move into a rental lists what a landlord may collect at the start.
The lead law. In a home built before 1978, if a child under six lives there, the owner must have it deleaded or brought under interim control. Refusing to rent to a family to avoid this is illegal. The lead law covers what it requires.
The state sanitary code sets minimum standards for heat, hot water, safety and repairs, and those duties stay with the owner whatever the lease says.
Fair housing law, which in Massachusetts protects source of income as well as the federal classes, so a tenant with a housing voucher may not be turned away for having one. Fair housing in Massachusetts sets out the rest.
Removing a tenant requires the court process, even at the end of a lease.

Some cities also require rental registration or inspections. Ask the town before the first tenant moves in.

Insurance, the mortgage and the condo association

Change the insurance to a landlord or dwelling policy, effective the day a tenant moves in. A homeowner's policy on a house you no longer live in may not respond to a claim. Home insurance in Massachusetts explains the difference.
Read your mortgage. Loans for a home you live in typically require you to occupy it for at least the first year. After that, renting it out is generally allowed. Before the first year is up, talk to the lender.
Read the condominium documents. Many associations limit rentals: minimum lease terms, a cap on rented units, or no rentals in the first year of ownership.

Managing from a distance

A landlord who has moved away needs someone local: a management company, or at the very least a reliable handyman, a plumber and an electrician who will answer a call at night in January. Budget for it. A tenant with no heat in a Massachusetts winter cannot wait for you to fly back.

When selling is the better answer

The rent barely covers the costs, or does not.
You have a large gain and would lose the exclusion by waiting.
You do not want to be a landlord under these rules, or cannot be one from where you are going.
You need the equity for the next house.

A written valuation tells you what selling would bring now, which is the number to set against the rent. If you are moving abroad, selling from abroad covers the tax and timing on that route, and buying a rental property covers being a landlord deliberately.

General information as of 2026, not legal or tax advice. Landlord obligations, tax rules and lender requirements change; a Massachusetts attorney and a tax adviser should review your plans before the first lease is signed.