On a $350,000 mortgage at 6.75%, you will pay roughly $467,000 in interest over 30 years. That is more than the home itself cost. But throw an extra $200 a month at it and you save about $115,000 in interest and finish over 6 years early. The math on extra principal payments is hard to argue with.
Below are the actual numbers for different extra payment amounts, how the mechanics work, and practical ways to find that extra cash without upending your life.
How Extra Principal Payments Work
When you make your regular mortgage payment, a portion goes toward the interest charged on your outstanding balance, and the rest chips away at the principal (the actual amount you owe). Early in your loan, the lion's share of each payment goes to interest, with only a small sliver reducing your principal. This is the nature of amortization.
Extra principal payments change this equation in your favor. Any additional money you pay goes directly toward reducing your principal balance. A smaller principal means less interest is charged in the next period, which means more of your regular payment goes toward principal, which means even less interest the following period, and so on. It is compound interest working in reverse -- and in your favor for once.
The Real Numbers: $350,000 Loan at 6.75%
Let us look at a concrete example. Say you have a $350,000 mortgage at 6.75% interest over 30 years with monthly payments.
Without Extra Payments
- Monthly payment: approximately $2,270
- Total interest over 30 years: approximately $467,000
- Total amount paid: approximately $817,000
You read that correctly -- you would pay well over double the original loan amount over the full term.
With an Extra $200 Per Month
- Monthly payment: $2,270 + $200 = $2,470
- Total interest saved: approximately $115,000
- Time saved: approximately 6 years and 2 months
- New loan term: roughly 23 years and 10 months
With an Extra $500 Per Month
- Monthly payment: $2,270 + $500 = $2,770
- Total interest saved: approximately $205,000
- Time saved: approximately 11 years and 6 months
- New loan term: roughly 18 years and 6 months
Your total interest drops from $467,000 to about $262,000, and you are mortgage-free more than a decade sooner. Want to see how your own numbers stack up? Try our mortgage extra payment calculator to run the figures for your specific loan.
With an Extra $1,000 Per Month
- Total interest saved: approximately $280,000
- Time saved: approximately 16 years
- New loan term: roughly 14 years
The pattern is clear: the more you pay, the faster the snowball effect kicks in. But even small amounts make a genuine difference.
Why Early Extra Payments Matter Most
The impact of extra payments is not linear. An extra $200 per month in the first year of your loan saves far more than the same $200 in year 20. This is because of how compound interest works.
In the early years of a 30-year mortgage, roughly 70% of each payment goes to interest and only 30% to principal. Any extra payment you make during this period has decades of compounding benefit ahead of it. Every dollar of principal you eliminate in year one would have generated interest for the next 29 years.
By contrast, in the final years of your loan, most of your payment already goes to principal, and there is less time for the savings to compound. Extra payments still help, but the effect is significantly smaller.
Biweekly Payments and Mortgage Recasting
There are two powerful strategies US homeowners can use to accelerate their mortgage payoff beyond simple extra monthly payments: biweekly payment plans and mortgage recasting.
Biweekly Payment Strategy
Instead of making one monthly payment, you pay half your monthly amount every two weeks. Because there are 52 weeks in a year, this results in 26 half-payments -- the equivalent of 13 monthly payments instead of 12. That one extra payment per year goes entirely toward principal and can shave years off your mortgage without dramatically changing your cash flow.
- Pro: Easy to set up -- many servicers offer biweekly payment programs
- Pro: Aligns well with biweekly paychecks, making budgeting easier
- Pro: Adds one full extra payment per year automatically
- Con: Some servicers charge a fee for their biweekly program -- you can achieve the same effect by making one extra monthly payment per year yourself
On our $350,000 example at 6.75%, switching to biweekly payments alone saves roughly $67,000 in interest and cuts about 4 years off the loan.
Mortgage Recasting
Mortgage recasting (also called re-amortization) is when you make a large lump sum payment toward your principal and then ask your lender to recalculate your monthly payment based on the new, lower balance -- while keeping the same interest rate and remaining term. Your monthly payment drops, but you keep the same loan.
- Pro: Lowers your required monthly payment, freeing up cash flow
- Pro: No credit check, no appraisal, and much cheaper than refinancing (typically $150-$500)
- Pro: Keeps your existing interest rate and loan terms
- Con: Requires a significant lump sum (usually $5,000 to $10,000 minimum)
- Con: Not all loan types qualify -- FHA and VA loans generally cannot be recast
- Con: If your goal is to pay off the mortgage faster, recasting alone does not shorten your term
Which Should You Choose?
If you want a set-it-and-forget-it approach that steadily accelerates your payoff, biweekly payments are hard to beat. If you come into a large sum of money (inheritance, bonus, home sale proceeds) and want to lower your required monthly payment, recasting is a great option. Many homeowners combine both: recast after a lump sum to lower the floor, then continue making biweekly or extra payments to pay down faster.
Prepayment Penalties: What US Borrowers Need to Know
Before you start making extra payments, check your loan terms. The good news is that most conventional and government-backed mortgages in the US have no prepayment penalty. Federal law prohibits prepayment penalties on FHA loans, VA loans, and USDA loans. The Dodd-Frank Act also severely restricts prepayment penalties on qualified mortgages (QM), which covers the vast majority of loans issued since 2014.
However, there are a few situations where penalties can still apply:
Jumbo and Non-QM Loans
Some jumbo loans and non-qualified mortgages (non-QM) may include prepayment penalty clauses, especially those originated by portfolio lenders. These penalties typically apply only during the first 3 to 5 years and are usually capped at 2% of the outstanding balance. Always read the fine print before signing.
Older Loan Products
If you have a mortgage that was originated before 2014 (especially subprime or Alt-A products from the pre-2008 era), it may contain prepayment penalties that are no longer common. If you are unsure, contact your loan servicer and ask directly.
Soft vs Hard Prepayment Penalties
When a penalty does exist, it comes in two forms. A "soft" prepayment penalty only applies if you refinance, not if you sell the home. A "hard" penalty applies in both scenarios. If your loan has any prepayment penalty, factor it into your calculations -- though in most cases, the interest savings from extra payments still far outweigh the penalty, especially after the penalty period expires.
10 Practical Tips for Making Extra Payments
Here are ten practical ways to find extra payment money:
- Set up automatic extra payments. Even $50 per week adds up to $2,600 per year. Automating your finances removes the temptation to spend the money elsewhere.
- Round up your payments. If your minimum is $2,270, round up to $2,500. You barely notice the difference, but it adds up significantly over time.
- Switch to biweekly payments. By paying half your monthly payment every two weeks, you end up making 26 half-payments per year instead of 12 full payments -- that is the equivalent of 13 monthly payments instead of 12.
- Put windfalls straight onto the mortgage. Tax refunds, work bonuses, birthday money, and inheritance -- directing lump sums to your mortgage has an outsized impact. The average American tax refund is over $3,000, which alone can save thousands in interest.
- Specify "apply to principal" on extra payments. When sending extra money to your servicer, always clearly mark it as an additional principal payment. Otherwise, some servicers may apply it to the next month's payment or hold it in escrow.
- Review your budget with the 50/30/20 rule. If you can trim your "wants" spending by even 5%, that freed-up cash can go straight to your mortgage.
- Direct pay raises to your mortgage. If you get a raise, keep living on your old salary and put the difference toward extra payments. You will not miss money you never had in your budget.
- Refinance to a lower rate but keep paying the same amount. If you refinance to a lower rate, do not reduce your payments. Keep paying the same dollar amount and the difference goes straight to principal.
- Cancel unnecessary subscriptions. That $15 streaming service you never watch? Over 25 years on your mortgage, redirecting it could save you thousands in interest.
- Tackle it as a team. If you have a partner, agree on an extra payment goal together. Shared motivation makes it far easier to stick with it.
Extra Payments vs Other Financial Goals
Should you throw every spare dollar at your mortgage? Not necessarily. Financial wellbeing is about balance. Before aggressively paying down your mortgage, consider whether you have:
- An emergency fund: Most experts recommend 3 to 6 months of expenses set aside before making extra mortgage payments. Without a safety net, an unexpected expense could force you into high-interest debt. See our guide on building an emergency fund from scratch.
- High-interest debt: If you have credit card debt at 20-25% APR, paying that off first will save you far more per dollar than putting extra on a 6.75% mortgage.
- Adequate retirement savings: Make sure you are contributing enough to your 401(k) to get the full employer match -- that is an instant 50-100% return on your money. Beyond the match, consider whether maxing out your IRA or Roth IRA (currently $7,500 per year, or $8,600 if you are 50 or older) makes more sense than extra mortgage payments, especially given the tax advantages and long-term growth potential.
Once those bases are covered, directing surplus cash to your mortgage is one of the most reliable financial moves you can make. It is a guaranteed, risk-free return equal to your mortgage interest rate.
A Quick Comparison: Extra Payments on a $350K Loan at 6.75%
| Extra Per Month | Interest Saved | Years Saved | New Loan Term |
|---|---|---|---|
| $0 | $0 | 0 | 30 years |
| $100 | ~$67,000 | ~3.6 | ~26.4 years |
| $200 | ~$115,000 | ~6.2 | ~23.8 years |
| $500 | ~$205,000 | ~11.5 | ~18.5 years |
| $1,000 | ~$280,000 | ~16 | ~14 years |
The Short Version
Pay more than the minimum, as consistently as you can. That is genuinely it. No complex strategy required.
Quick summary:
- Even small extra payments ($50-$200 per month) save tens of thousands of dollars in interest
- The earlier you start, the bigger the impact due to compound interest working in your favor
- Use biweekly payments or mortgage recasting to accelerate your payoff
- Most US mortgages have no prepayment penalty -- check your loan terms to be sure
- Balance extra payments with building an emergency fund, maxing out your 401(k) match, and paying off high-interest debt first
Plug your own loan details into our mortgage extra payment calculator and see the specific numbers. Even $50 a week makes a measurable dent.