Massachusetts Landlord Year-End Checklist for 2026

Massachusetts Landlord Year-End Checklist for 2026

December is when sloppy books get expensive. Every missing W-9, unlogged repair, and unpaid deposit interest notice turns into a scramble in January, right when the 1099 deadline hits.

This landlord year-end checklist for Massachusetts covers the five things every rental owner should close out before tax season. Start now and January is a formality. Wait, and it becomes a fire drill.

Finish the Q4 repairs, and document them

Open work orders do not disappear on December 31. They roll into next year with a fuzzy paper trail. Walk the list now: what is open, what is approved, what is done, and what still needs an invoice.

Every completed job should have a vendor invoice, a payment record, and a note tying it to the right property and unit. The IRS treats repairs and improvements differently, so a new roof and a patched roof may not land on the return the same way. That call belongs to your CPA. Your job is to hand over clean invoices that describe exactly what was done.

If winter work is still pending, the BILDER Group winter prep checklist covers what should be finished before the first storm.

Collect W-9s before you need them

The rule is simple: no W-9, no payment. Request a Form W-9 from every contractor before the first check, not in late January when they stop answering calls.

For payments made in 2026, the IRS threshold for filing Form 1099-NEC is $2,000 per payee for the year. It was $600 for payments made before 2026, and the IRS says it will be adjusted for inflation after 2026. That higher number means fewer forms for some owners, but the W-9 still matters. It is how you get a correct name and taxpayer ID, and the IRS backup withholding rules can apply when a vendor does not provide one.

A few details trip owners up. Payments to attorneys are generally reportable even when the firm is a corporation. Payments made by credit card are generally reported by the card processor, not on your 1099-NEC. Whether you, as a rental owner, are required to file at all depends on how your rental activity is treated, so verify with your CPA.

Hit the January deadline

Form 1099-NEC goes to both the IRS and the contractor by January 31. When that date lands on a weekend, the deadline moves to the next business day, and January 31, 2027 is a Sunday. Anyone filing 10 or more information returns in total for the year generally has to file them electronically.

Build the vendor payment totals in December, not January. Pull every payment by vendor, check it against invoices, and flag anyone near or over the threshold. A clean list on January 2 makes the deadline easy.

Square up deposit and last month's rent interest

Massachusetts security deposit law does not care what time of year it is. Under M.G.L. c.186, section 15B, a security deposit stays the tenant's property and must sit in a separate, interest-bearing account at a bank in Massachusetts. At the end of each year of the tenancy, the tenant is owed interest at 5% per year or the lesser amount the bank actually paid, along with a statement showing the bank, the account number, the deposit amount, and the interest due.

Last month's rent collected in advance earns interest too, at the same 5% or lesser bank rate, paid at the end of each year of the tenancy. Interest is not owed for the final month covered by that payment.

These dates follow each lease anniversary, not the calendar, so year-end is the time to audit them. List every deposit and every last month's rent you hold, confirm the account and balance, and check that every anniversary this year got its statement and interest. Miss one and the tenant can deduct it from rent. Mishandle the deposit itself and the statute allows damages of three times the deposit, plus interest, costs, and attorney's fees.

Clean up the books before the CPA asks

Your CPA needs the same handful of things from every rental owner: rent collected by property, expenses by category, mortgage interest and property tax records, insurance, management fees, and a list of capital projects. Reconcile every bank account through December 31 and make sure owner statements match the bank.

Keep the records too. The IRS generally says to keep tax records for at least three years after filing, and records tied to the property itself until the limitations period runs out for the year you sell it. The deposit statute separately requires deposit records to be kept for two years after a tenancy ends.

None of this is glamorous. All of it decides whether tax season takes one meeting or six.

The BILDER Group takeaway

Year-end across one property is a weekend with a shoebox of receipts. Across a portfolio, it is a system, and BILDER Group runs it that way for every owner it manages.

Every job runs through Buildium as a task linked to a work order, with the vendor invoice attached to the bill, so Q4 repairs close with a full paper trail. BILDER Group keeps a W-9 on file for every vendor before the first payment and tracks vendor payment totals in Buildium all year. Deposits and last month's rent are tracked unit by unit, with interest dates logged against each lease.

Owners get a monthly financial package all year and a year-end owner tax package by January 31: rent collected, expenses by category, deposits held, and a vendor 1099 summary, ready to hand to their own CPA. Core pricing is 5% of collected rent, $250 per property to onboard, and $250 per lease renewal, with every fee spelled out in the management agreement.

If you are looking for a new property manager in Greater Boston, December is a smart time to switch. BILDER Group can have the new year's books set up from day one.

Sources: IRS, Am I required to file a Form 1099 or other information return?, https://www.irs.gov/businesses/small-businesses-self-employed/am-i-required-to-file-a-form-1099-or-other-information-return ; IRS, Instructions for Forms 1099-MISC and 1099-NEC, https://www.irs.gov/pub/irs-pdf/i1099mec.pdf ; IRS, About Form W-9, https://www.irs.gov/forms-pubs/about-form-w-9 ; IRS, How long should I keep records?, https://www.irs.gov/businesses/small-businesses-self-employed/how-long-should-i-keep-records ; M.G.L. c.186, section 15B, https://malegislature.gov/Laws/GeneralLaws/PartII/TitleI/Chapter186/Section15B ; Mass.gov, Security deposits and last month's rent, https://www.mass.gov/info-details/security-deposits-and-last-months-rent

This article is general information from BILDER Group, current as of November 2026. It is not legal or tax advice. Laws change and every situation is different. Talk to a Massachusetts attorney or CPA about your property.

Own rental property in Greater Boston? BILDER Group takes it from here. Call (617) 341-9002.