To save on mortgage interest, attack the balance that generates it: refinance to a lower rate or a shorter term, add extra principal to your monthly payment, pay biweekly so you make one extra payment a year, recast after a lump sum, buy discount points at closing when you’ll stay long enough to break even, and cancel private mortgage insurance as soon as you qualify so the freed cash can go toward principal. Each dollar of principal you eliminate early is a dollar that stops generating interest for the rest of the loan, and on a 30-year mortgage the total interest can rival the original loan amount, so consistent use of even one or two of these approaches can save tens of thousands of dollars.
Refinance to a Lower Rate or Shorter Term
Refinancing replaces your current mortgage with a new loan on different terms. It’s most useful when market rates have dropped meaningfully below your existing rate or when your credit profile has improved enough to qualify you for better pricing. The catch is closing costs, which often run 2% to 6% of the new loan amount and include appraisal, title, and origination fees. Weigh those upfront costs against projected savings; the break-even timeline matters more than the rate drop alone.
Switching from a 30-year to a 15-year term is one of the strongest moves available. Fifteen-year loans carry lower interest rates, and the compressed schedule sends far more of each payment to principal from day one. The monthly payment is higher, but total interest over the life of the loan drops sharply. If your budget can absorb the payment, this single change often saves more than anything else on this list.
Your credit score directly shapes the rate you’ll be offered, and the spread between weaker and stronger scores on a conventional 30-year loan can approach a full percentage point. On a $300,000 mortgage, that gap adds up to tens of thousands of dollars in additional interest. Before you apply, pull your credit reports, correct errors, and pay down revolving debt where you can.
Federal rules require your lender to deliver a Loan Estimate within three business days of receiving your application, itemizing the projected rate, monthly payment, and closing costs so you can compare offers.1Consumer Financial Protection Bureau. TILA-RESPA Integrated Disclosure FAQs Get estimates from two or three lenders. The variation in fees and rates is usually bigger than borrowers expect.
Make Extra Principal Payments
Adding even a small amount to your monthly payment and directing it toward principal shrinks the balance that accrues interest the following month. Because mortgage amortization is front-loaded with interest in the early years, extra payments made early have an outsized effect. An additional $100 or $200 per month on a $250,000 loan can shave years off the payoff date and save thousands in interest, with no refinance required.
The step most people skip: tell your servicer in writing that the extra money is a principal-only payment. Mark it on the coupon, note it in the online portal, or call and confirm. Without that designation, the servicer may apply the funds to the next scheduled payment, which includes interest and escrow. Federal rules require servicers to send periodic statements showing exactly how each payment was applied, so use those statements to verify that your principal balance is dropping by more than the scheduled amount.2Consumer Financial Protection Bureau. 12 CFR 1026.41 – Periodic Statements for Residential Mortgage Loans
Check your loan documents for a prepayment penalty before you commit spare cash to principal. Most conventional loans originated in the last decade don’t carry one, and federal rules bar them entirely on higher-priced mortgages, but some older or nonconforming loans do. Where penalties are permitted, they’re capped at 2% of the prepaid balance in the first two years and 1% in the third, with none allowed after three years.3eCFR. 12 CFR 1026.43 – Minimum Standards for Transactions Secured by a Dwelling
Switch to Biweekly Payments
A biweekly schedule splits your monthly payment in half and pays that half every two weeks. Because a year has 52 weeks, you end up making 26 half-payments, which equals 13 full monthly payments instead of 12. The extra payment goes to principal, and on a 30-year loan this approach alone can cut roughly four years off the timeline.
Some servicers offer formal biweekly programs. Be wary of third-party companies that market the service aggressively; they sometimes charge setup and per-transaction fees, and some hold your half-payment in a suspense account until the second half arrives, which erases the benefit of more frequent principal reduction. Ask your servicer directly whether they offer biweekly payments at no cost.
If your servicer doesn’t offer a free program, replicate the effect yourself. Divide your monthly payment by 12 and add that amount to each month’s payment as extra principal. On an $1,800 payment, that’s $150 extra per month, and the annual result matches a biweekly plan without fees or timing complications.
Request a Mortgage Recast
Recasting works differently from the other strategies here, and it’s underused. You make a large lump-sum payment toward principal, and the lender recalculates your monthly payment based on the reduced balance over the remaining term at your existing interest rate. The required monthly payment drops. There’s no new loan, no credit check, and no appraisal.
Most lenders require a minimum lump sum of $5,000 to $10,000 to initiate a recast, plus a processing fee that usually runs a few hundred dollars. The real limitation is eligibility: government-backed mortgages including FHA, VA, and USDA loans generally cannot be recast. You need a conventional loan.
Recasting fits best when you’ve come into a significant sum and want to lower your monthly obligation without the cost of refinancing. It won’t change your interest rate or loan term, so it’s not the tool for an above-market rate. But if you already have a competitive rate and want breathing room in the budget while reducing total interest, recasting is one of the simplest options available.
Buy Discount Points at Closing
Discount points are prepaid interest you buy when originating or refinancing a mortgage. Each point costs 1% of the loan amount, so on a $300,000 mortgage, one point is $3,000. In exchange, you get a permanently lower rate for the life of the loan. The reduction per point varies by lender, loan type, and market conditions and isn’t fixed.4Consumer Financial Protection Bureau. How Should I Use Lender Credits and Points (Also Called Discount Points)?
The decision reduces to a break-even calculation. Divide the total cost of the points by the monthly savings the lower rate produces; the result is the number of months you’ll need to stay in the home before the upfront cost pays for itself. If you plan to sell or refinance before that point, buying points costs you money. If you’ll stay well past it, the long-term savings can be substantial. Your Closing Disclosure will itemize the points paid and the resulting rate.5Consumer Financial Protection Bureau. 12 CFR 1026.38 – Content of Disclosures for Certain Mortgage Transactions (Closing Disclosure)
Drop Private Mortgage Insurance
If you put less than 20% down when you bought your home, you’re likely paying private mortgage insurance each month. PMI protects the lender, not you, and it adds cost that does nothing for your equity. Removing it doesn’t lower your rate, but it cuts your monthly housing expense, and the freed cash can be redirected to extra principal that does reduce interest.
Under the Homeowners Protection Act, you have the right to request PMI cancellation once your principal balance reaches 80% of the home’s original value, provided you’re current on payments and have a good payment history.6Office of the Law Revision Counsel. 12 USC 4901 – Definitions If you don’t ask, the servicer must automatically terminate PMI when the balance hits 78% of original value.7Consumer Financial Protection Bureau. When Can I Remove Private Mortgage Insurance (PMI) From My Loan? The automatic threshold uses the original amortization schedule, so extra payments that accelerate your paydown get you there faster.
If your home has appreciated, you may be able to cancel PMI based on a new appraisal rather than waiting for the scheduled paydown. Requirements are stricter: lenders typically require at least two years of ownership with a balance no more than 75% of the current appraised value, or at least five years with a balance no more than 80% of the new value. You’ll pay a few hundred dollars for the appraisal, but if your home’s value has jumped, it can eliminate PMI years ahead of schedule.8Office of the Law Revision Counsel. 12 USC 4902 – Termination of Private Mortgage Insurance
Factor In the Mortgage Interest Deduction
How mortgage interest is treated at tax time changes the effective cost of your loan. You can deduct interest on up to $750,000 of mortgage debt used to buy, build, or substantially improve your primary residence ($375,000 if married filing separately). Mortgages taken out before December 16, 2017 may qualify under the older $1 million limit.9Internal Revenue Service. Publication 936, Home Mortgage Interest Deduction
The deduction only helps if you itemize, and itemizing only makes sense when total itemized deductions exceed the standard deduction, which for 2026 is $16,100 for single filers and $32,200 for married couples filing jointly.10Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 As you pay down the mortgage and the interest portion of each payment shrinks, you may fall below the itemization threshold. Discount points paid at closing on a purchase mortgage are generally deductible in the year you pay them if the points were computed as a percentage of principal and are customary for your area; points paid on a refinance typically must be deducted gradually over the life of the loan.11Internal Revenue Service. Topic No. 504, Home Mortgage Points
When Accelerating Payoff Isn’t the Best Move
Every dollar you send to extra principal is a dollar you can’t invest elsewhere, and the trade-off deserves honest math. In early 2026, top high-yield savings accounts are paying roughly 4% to 5% APY with essentially no risk. If your mortgage rate is lower than what you can earn in a savings account or short-term Treasury, accelerating payoff means choosing a lower guaranteed return over a higher one.
The comparison shifts toward prepayment when you weigh certainty and taxes. Interest savings are guaranteed; investment returns aren’t. And if you don’t itemize, your stated mortgage rate is your true cost with no tax offset. But if you carry high-interest credit card debt, have no emergency fund, or aren’t capturing employer matches or maxing tax-advantaged retirement accounts, those priorities come first. Sending extra money to a 6% mortgage while carrying 22% credit card debt is a net loss every month.