Extra Mortgage Payment Calculator
See exactly how much time and money extra payments save you — $100, $200, $500, or any amount per month.
Try the Extra Payment Simulator →How Extra Mortgage Payments Work
When you make extra payments on your mortgage, the additional amount goes directly toward your principal balance. Since interest is calculated on the remaining principal each month, reducing it faster creates a compounding savings effect — less balance means less interest, which means even more of your next payment goes to principal.
On a typical $300,000 mortgage at 7% over 30 years, your total interest would exceed $418,000 — more than the house itself. Even modest extra payments dramatically change this picture:
Example: $300,000 loan at 7%, 30 years
| Extra/Month | Years Saved | Interest Saved |
|---|---|---|
| $100 | 4 years | $63,000+ |
| $200 | 7 years | $108,000+ |
| $500 | 12 years | $186,000+ |
| $1,000 | 17 years | $254,000+ |
When Extra Payments Have the Most Impact
Extra payments save you the most when made early in the loan. In the first few years of a 30-year mortgage, roughly 80% of each payment goes to interest. An extra $200/month in year 1 saves far more than the same $200 in year 20 because it prevents interest from compounding on that principal for decades.
This is why financial advisors often recommend putting bonuses, tax refunds, or windfalls toward your mortgage as early as possible — a single $5,000 lump sum in year 1 can save over $15,000 in interest over the life of the loan.
Extra Payment Strategies
- Fixed extra amount each month — the simplest approach. Even $50/month makes a difference over 30 years.
- One extra payment per year — use your tax refund or year-end bonus. This alone can cut 4-5 years off a 30-year mortgage.
- Round up your payment — if your EMI is $1,847, round to $2,000. The extra $153/month adds up fast.
- Increase by a percentage each year — as your income grows, increase payments by 5-10% annually. Painless acceleration.
- Biweekly payments — pay half your monthly payment every two weeks. Since there are 26 biweekly periods, you make 13 full payments per year instead of 12.
Should You Pay Extra or Invest?
The decision depends on your mortgage rate vs expected investment returns. If your mortgage is at 7% and you can reliably earn 10% in the stock market, investing may win mathematically. But paying extra on your mortgage gives you a guaranteed, risk-free return equal to your interest rate. There's also the psychological value of being debt-free sooner.
Many homeowners take a hybrid approach: contribute enough to get their employer's 401(k) match, then direct extra cash toward the mortgage. Use the simulator to model both scenarios and see the actual dollar difference.
Things to Check Before Paying Extra
- No prepayment penalty — most US mortgages have no penalty, but check your loan documents.
- Specify "apply to principal" — tell your servicer the extra should reduce principal, not prepay future interest.
- Emergency fund first — keep 3-6 months of expenses liquid before accelerating mortgage payoff.
- Higher-interest debt first — pay off credit cards (15-25% APR) before extra mortgage payments (3-7% APR).
Frequently Asked Questions
How much does one extra mortgage payment per year save?
On a $300,000 mortgage at 7%, one extra full payment per year (~$2,000) can eliminate approximately 4-5 years of payments and save over $80,000 in interest. The earlier you start, the more you save due to compounding.
Is it better to pay extra monthly or make a lump sum?
If you have the lump sum available now, paying it immediately saves more because it reduces principal sooner. But if you'd need to save up the lump sum over the year, making extra monthly payments is better — each month's extra payment starts saving you interest right away instead of sitting in a savings account earning less.
Does paying extra on mortgage go to principal?
Yes, extra payments should go directly to principal. Most servicers apply extra funds to principal automatically, but it's good practice to specify "apply to principal" when making the payment. Some servicers may otherwise advance your due date instead of reducing the balance.
How much does paying an extra $100 a month save?
On a $300,000 mortgage at 7% for 30 years, an extra $100/month saves approximately $63,000 in interest and pays off the loan about 4 years early. On a $250,000 loan at 6%, it saves about $31,000 and cuts nearly 5 years off.
Is it worth paying extra on a low-interest mortgage?
If your mortgage rate is below 4%, you may earn more by investing extra cash in index funds (historical ~10% return). However, paying off a mortgage provides a guaranteed, risk-free return equal to your rate and the peace of mind of owning your home outright. Many people do both.
Are there penalties for paying extra on my mortgage?
Most conventional, FHA, and VA loans in the US do not have prepayment penalties. However, some older loans or jumbo mortgages might. Check your loan disclosure documents or call your servicer to confirm before making large extra payments.