A mortgage curtailment is an extra payment applied directly to your loan’s principal balance, separate from your regular monthly installment. Because interest is calculated on whatever principal is outstanding, shrinking that balance ahead of schedule reduces every future interest charge and pays the loan off sooner. You keep making your normal payment on the normal due date; the curtailment is money on top.
How a Curtailment Works
Your regular monthly payment covers interest, a slice of principal, and usually an escrow deposit for taxes and insurance. A curtailment bypasses all of that. It goes straight to the outstanding principal, and your servicer is required to accept and immediately apply any additional principal payment you identify as such on a current loan.1Fannie Mae. Processing Additional Principal Payments The money does not cover next month’s interest, fund your escrow, or move your due date forward. You still owe the full scheduled payment when it comes due.2Fannie Mae. Loan Delivery Job Aids – Principal Curtailments
Most curtailments are partial: an extra $200 one month, $1,000 the next, whatever fits your budget. There’s no commitment beyond what you send each time, and your required payment stays the same. A full curtailment pays off the entire remaining balance at once. For that, you need a payoff statement from your servicer showing the exact amount owed on a specific date, including interest accrued up to that day. Full payoffs also carry a higher risk of triggering a prepayment penalty if one exists in your loan documents.
How Curtailment Saves Interest and Shortens the Loan
On a conventional mortgage, interest is calculated monthly: the annual rate is divided by 12 and multiplied by the current balance. Early in a 30-year loan, most of your payment goes toward interest and very little chips at principal. That’s why curtailments are so powerful in the early years.
Take a $300,000 mortgage at 6.5% interest. The monthly interest charge on that balance is roughly $1,625. Make a one-time $5,000 curtailment during the first year, and every subsequent month’s interest is calculated on $295,000 instead of $300,000. That saves about $27 per month in interest. Across 25 remaining years, the cumulative savings far exceed the $5,000 you put in, and the loan pays off months earlier than scheduled.
The math gets less dramatic as the loan matures, because the amortization schedule naturally shifts more of each payment toward principal over time. A $5,000 curtailment in year 25 saves far less interest than the same payment in year 2. If you’re going to make extra payments, front-loading them delivers the biggest return.
How to Make the Payment
The critical step is making sure your servicer knows the extra money is for principal reduction, not a future monthly payment. If it lands on next month’s bill instead, you miss the interest savings entirely. Most servicers offer three routes:
- Online portal. Look for a “principal only” or “additional principal” option in the payment section. This is the most reliable method because the system tags the payment correctly at submission.
- Phone. Call your servicer and specify that you want to make a principal-only payment. Ask for confirmation that it was applied to principal.
- Check by mail. Write “Apply to Principal Only” on the memo line. Send it to the payment processing address, which may differ from the correspondence address on your statement.
After the payment posts, check your next statement or online account to confirm that the principal balance dropped by exactly the amount you sent. If it didn’t, act quickly. Misapplied payments are one of the most common servicing problems, and the longer you wait, the harder the correction becomes.
Does Paying Earlier in the Month Help?
It depends on your loan type. Most conventional fixed-rate mortgages use monthly interest accrual: interest is calculated once per month on the outstanding balance, and the grace period (usually 15 days after the due date) is effectively interest-free. On these loans, paying on the first versus the fourteenth makes no difference to your interest charge.
Simple-interest mortgages, which are less common but do exist, calculate interest daily. On those loans, every day you delay adds another day of interest, so paying as early as possible genuinely saves money. Check your loan documents or ask your servicer which method your mortgage uses. Either way, the goal is to get the curtailment applied before the next monthly interest calculation.
If Your Payment Is Misapplied
If your extra payment lands in escrow, on a future installment, or in some unclear holding account, there is a formal process to fix it. Under federal servicing rules, you can send your servicer a written Notice of Error explaining that a payment was not credited correctly.3eCFR. 12 CFR 1024.35 – Error Resolution Procedures The same letter is sometimes called a Qualified Written Request.4Consumer Financial Protection Bureau. What Is a Qualified Written Request (QWR)?
Explain the error in detail: the date of the payment, the amount, and how it should have been applied. Send it to the servicer’s designated correspondence address, which is often different from where you mail payments. The servicer must acknowledge your letter within five business days and either correct the error or explain why it believes no error occurred within 30 business days.3eCFR. 12 CFR 1024.35 – Error Resolution Procedures The servicer cannot charge you a fee for responding.
Curtailment vs. Recast
A curtailment reduces your balance and shortens your payoff date, but your required monthly payment stays the same. A mortgage recast is different: after a large lump-sum principal payment, the servicer recalculates your amortization schedule using the new, lower balance spread over the remaining term. The result is a lower required monthly payment going forward, rather than a shorter loan.
A few things to know about recasts:
- Recasting is at your servicer’s discretion. You have to request it and get approval.
- Most servicers require a lump sum of at least $10,000, though some set the threshold as a percentage of the remaining balance.
- Expect a small administrative fee, often around $250.
- Recasting is generally available on conventional loans backed by Fannie Mae or Freddie Mac. Government-backed loans, including FHA, VA, and USDA mortgages, typically cannot be recast.
If your goal is to pay the least total interest and own the home sooner, stick with curtailments. If your goal is a lower monthly obligation without refinancing, ask about a recast.
Prepayment Penalties
Federal rules that took effect in January 2014 heavily restrict when a lender can charge a prepayment penalty. For a qualified mortgage (which covers the vast majority of conventional residential loans), any prepayment penalty is limited to the first three years and cannot exceed 2% of the prepaid balance in years one and two, dropping to 1% in year three.5eCFR. 12 CFR 1026.43 – Minimum Standards for Transactions Secured by a Dwelling Even then, the penalty is only allowed on fixed-rate loans that are not higher-priced. After three years, no prepayment penalty of any kind can be imposed on a qualified mortgage.6GovInfo. 15 USC 1639c – Minimum Standards for Residential Mortgage Loans
Most lenders stopped including prepayment penalties in new loans after these rules took effect. If your mortgage originated after January 2014 and is a standard conforming loan, a penalty is unlikely. Where you need to be careful is with older loans, jumbo loans, or non-qualified mortgages. Check the promissory note, specifically the section on prepayment. Even where a penalty applies, small partial curtailments often fall below the threshold that triggers it.
Getting Rid of PMI Sooner
If you put less than 20% down when you bought your home, you’re almost certainly paying private mortgage insurance. Curtailments can help you drop that cost sooner. Under the Homeowners Protection Act, you can request PMI cancellation in writing once your principal balance reaches 80% of the home’s original value, provided you have a good payment history, are current on payments, have no junior liens, and can show the property value hasn’t declined below its original value.7Consumer Financial Protection Bureau. When Can I Remove Private Mortgage Insurance (PMI) From My Loan?
Without extra payments, you’d wait until the original amortization schedule reaches that 80% mark, which can take a decade or more on a 30-year loan with a small down payment. Curtailments get you there faster by pushing the balance down ahead of schedule. Once you believe you’ve crossed the threshold, submit a written cancellation request to your servicer. Your servicer may require an appraisal to confirm the home’s value, at your expense.
Even if you do nothing, the law requires your servicer to automatically terminate PMI when the balance is scheduled to reach 78% of the original value based on the original amortization schedule.8Office of the Law Revision Counsel. 12 USC 4902 – Cancellation and Termination That automatic termination is tied to the scheduled amortization, not your actual balance. Curtailments won’t accelerate the automatic date, but they let you make the written cancellation request at 80% based on your actual payments.