A closed mortgage is a home loan that limits how quickly you can pay it off. You agree to follow a set payment schedule for a set term, and if you pay the balance off early, refinance, or make an unusually large extra payment, the lender can charge a prepayment penalty. In return for accepting those restrictions, you generally get a lower interest rate than a loan with full prepayment flexibility would carry. Most conventional US mortgages function as closed mortgages to some degree, because they lock you into a schedule and may charge a penalty if you deviate from it during a specified window.
What “Closed” Actually Restricts
When you sign the loan, you commit to repaying it over a fixed term at a fixed rate on a fixed schedule. In the US, residential terms typically run 10, 15, 20, or 30 years. The lender expects that schedule to hold. Pay the balance off tomorrow, refinance into a cheaper loan next year, or drop a large lump sum on the principal, and you may owe the lender extra money for the privilege.
The reason is straightforward. Lenders price loans around the interest they expect to collect. Paying early cuts that income short, and the prepayment penalty is how they recover the lost revenue. The lower rate on a closed mortgage is the borrower’s share of that predictability.
For most borrowers, that trade works out. If you plan to stay in the home, don’t expect a windfall, and aren’t waiting for rates to drop so you can refinance, the interest savings outweigh the loss of flexibility. The closed structure only bites when your plans change and you need out of the loan before the restriction period ends.
How the Prepayment Penalty Is Calculated
Two calculation methods dominate, and many contracts specify that the lender will charge whichever produces the larger amount.
The simpler method is a fixed number of months’ worth of interest on the amount you prepay. Three months is typical. On a $300,000 balance at a 6% rate, one month of interest is $1,500, so a three-month penalty runs $4,500.
The second method, the interest rate differential, compares your contract rate to the current market rate for a term matching the time left on your mortgage. If your rate is 6% and the current rate for that remaining term is 4%, the lender calculates the interest income it loses on the 2% gap, multiplied by your remaining balance and the time left. When rates have fallen since you signed, this calculation can produce penalties that dwarf the three-month approach.
Hard vs. Soft Penalties
A soft prepayment penalty applies only if you refinance, not if you sell the home. A hard penalty applies either way. The difference matters if there’s any chance you’ll move: a soft penalty gives you an exit through a sale, while a hard penalty means you owe the lender no matter why the loan is being paid off. Which one you have is spelled out in your mortgage note.
Penalty-Free Prepayment Allowances
Most closed mortgages let you make some extra payments without penalty. A common threshold is 20% of the loan balance per year. Anything below that goes straight to principal without triggering a charge. If you want to pay down the loan faster while staying inside a closed contract, using the full annual allowance is the efficient way to do it. The exact amount varies widely by lender, so read the prepayment section of the note before you sign.
Federal Rules That Limit Prepayment Penalties
US law restricts when lenders can charge these penalties at all. Under rules the Consumer Financial Protection Bureau wrote to implement the Dodd-Frank Act, prepayment penalties are generally prohibited except on certain fixed-rate qualified mortgages, and even there only when the lender has offered the borrower an alternative loan without a penalty.1Consumer Financial Protection Bureau. Summary of the Ability-to-Repay and Qualified Mortgage Rule Because most US mortgages originated today are qualified mortgages, outright prepayment penalties are far less common than they were before the 2008 financial crisis.
FHA-insured mortgages carry no prepayment penalty. Neither do VA or USDA loans. If your mortgage is backed by any of those government programs, you can pay it off early without owing anything extra.
Whatever the structure, the lender has to tell you about it up front. The Truth in Lending Act, implemented through Regulation Z, requires your loan disclosures to spell out whether a prepayment penalty exists, how it’s calculated, and when it applies.2Consumer Financial Protection Bureau. 12 CFR 1026.18 – Content of Disclosures If the penalty terms aren’t in your closing documents, the lender generally cannot enforce them later. Before signing, find the prepayment section and confirm you understand exactly what triggers a charge and how much it would be.
Getting Out Early Without Paying the Penalty
If you sell the home before the restriction period ends, paying the penalty isn’t always your only option. What’s available depends on the loan.
Due-on-Sale Clauses
Most conventional mortgages include a due-on-sale clause. It requires you to pay off the entire remaining balance when you sell the property, so at closing the mortgage gets paid off and any applicable prepayment penalty comes due along with it. The Garn-St. Germain Depository Institutions Act of 1982 established the federal framework for these clauses and carved out limited exceptions, but a standard sale to a new buyer isn’t one of them.
Assumable Loans
Government-backed loans are the exception worth knowing about. All FHA-insured mortgages are assumable: a qualified buyer can take over your existing loan instead of getting a new one. The buyer has to meet creditworthiness standards, and for FHA loans closed on or after December 15, 1989, the lender must approve the new borrower’s credit before releasing you from the debt.3U.S. Department of Housing and Urban Development. HUD 4155.1 Chapter 7 – Assumptions VA loans are also assumable under similar conditions.
Assumption is a real selling advantage when your existing rate sits well below current market rates. A buyer stepping into a 4% mortgage in a 7% rate environment saves a significant amount over the life of the loan. The limit is that the buyer usually has to cover the difference between your remaining balance and the purchase price in cash or with a second loan, which narrows the pool of people who can actually use the option.
A Note on Portability
Portability, where you carry your existing mortgage to a new property when you move, is a standard feature in Canadian lending but rare in US contracts. If you see the word while shopping for a US loan, read the fine print to see what the lender actually means by it, because it usually isn’t the full transfer feature the term implies elsewhere.
When a Closed Mortgage Is the Right Fit
A closed mortgage works well when your housing situation is stable. Planning to stay in the home for the full term, not expecting a large sum that would let you pay off the balance early, and wanting the lowest rate you can get: none of those pressures collide with the restrictions, so the restrictions cost you nothing. Most homeowners fit that description, which is why the closed structure dominates residential lending.
The risk shows up when life shifts. A job relocation, a divorce, an inheritance that makes early payoff attractive, or a sharp drop in rates that makes refinancing tempting can all run into prepayment restrictions. Before you commit, think honestly about whether any of those scenarios are plausible in the next few years. If they are, a slightly higher rate on a loan without a penalty may cost less than the penalty you would owe to get out of a closed one.