The Cape Cod AquiFund loan and the Massachusetts septic tax credit, explained

The Massachusetts Title 5 tax credit

This is a credit against your Massachusetts income tax for a qualifying septic repair or replacement. It is written for a home you own and occupy as your principal residence, which is a real limit on the Cape, where many homes are seasonal or rented. It is not a cash rebate, and it is not paid out by the town.

You claim it on Schedule SC, and you will need the Certificate of Compliance from your board of health. The credit amount, the cap on eligible spending, and the kinds of work that qualify have all changed since the credit was created, and they can change again. The state's own page for Massachusetts residential property tax credits is the current one, and the state also keeps a guide to Title 5 financial assistance for system owners. We are not tax advisors, so confirm the details there and with your tax preparer.

The 2024 change that matters most on Cape Cod

One expansion is worth knowing about here specifically, because it lines up with the path every designated Cape town is taking on nitrogen. The state's page says that for tax years beginning on or after January 1, 2024, the credit "has been expanded to included expenses incurred for repairs, replacements, upgrades or sewer connections that are required by Title 5 of the State Environmental Code, 310 CMR 15.000, or a watershed permit issued by the Department of Environmental Protection."

In plain terms: the credit was originally aimed at a failed system. Work you are required to do because of a watershed permit, which is the route Cape towns are using instead of putting homeowners on an individual nitrogen upgrade clock, can now count too. If a town's plan eventually requires something of your property, that is worth raising with your tax preparer rather than assuming the credit does not apply. Read at the state's page 2026-08-13, which carries its own last-updated date of March 10, 2026.

Barnstable County's AquiFund loan, the Cape Cod septic loan program

AquiFund, the county's Community Septic Management Loan Program, solves the other half of the problem: the up-front cash. If you have heard it called "the Cape Cod AquiFund" or simply the county septic loan, this is the program people mean. It may be available for septic repairs, replacements, and nitrogen-reducing I/A upgrades. Because it is a betterment loan, repayment is added to your property tax bill and stays with the property rather than following you.

The rate, the term, and who qualifies depend on the work and on your situation, and the county sets all of it. Rates quoted around the Cape often belong to a different category of work, such as a new sewer connection, so do not assume a number you heard applies to septic work. Current terms and the application are on the county's AquiFund page.

How to plan around them

Price the job first. A conventional Title 5 replacement on the Cape generally runs about $25,000 to $45,000, and a nitrogen-reducing I/A system about $25,000 to $35,000, with the lot, the soils, and access driving where you land. Get that number from a contractor after a site visit, and build your plan on it.

Then treat the two programs as possible offsets on top of that number, not as part of it. Check your eligibility with the state and the county using the links above before you count on either one. A quote is a real number; a program is a maybe until the agency says otherwise.

On the South Shore

AquiFund is a Barnstable County program, so it does not reach Plymouth County. The statewide tax credit still applies, and towns run their own loan programs. Our Plymouth page covers how that works there.

Putting it to work

The programs only matter once you know your number. See the replacement cost guide for what a Cape job runs, the replacement page for how it works, and the Title 5 guide for the full process. When you are ready, send your details and get a free quote.