Extra Payment Mortgage Calculator

See how extra payments accelerate your mortgage payoff

Your Mortgage
Extra Payment Options
Payoff Comparison
Regular Payment: $0.00
With Extra Payment: $0.00
Regular Payoff: -
Accelerated Payoff: -
Regular Total Interest: $0.00
Your Acceleration Results
Years Saved: 0 years
Interest Saved: $0.00

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Why Make Extra Mortgage Payments?

Extra principal payments create a powerful compounding effect. Every dollar you pay toward principal immediately reduces the balance that future interest is calculated on. Over time, this creates exponential savings.

For example, on a $350,000 mortgage at 6.5%, paying just $200 extra per month saves over $80,000 in interest and pays off your home 5+ years earlier. That's real money back in your pocket.

How to Use This Calculator

Step 1: Enter your current mortgage balance.
Step 2: Input your interest rate.
Step 3: Select remaining loan term.
Step 4: Add your planned extra payments (monthly, one-time, or annual).
Step 5: Click "Calculate Impact" to see your acceleration results.
Step 6: Experiment with different amounts to find your sweet spot.

Extra Payment Strategies

Find the approach that fits your budget:

  • Round Up: Round your payment to nearest $50 or $100.
  • Tax Refund: Apply your annual tax refund to principal.
  • Bonus Money: Put work bonuses or gifts toward your home.
  • Side Income: Direct freelance or gig income to mortgage.
  • Budget Finds: Apply savings from expense cuts to principal.

Even small, consistent extra payments create significant long-term savings.

Who Should Make Extra Payments?

  • High-Rate Mortgage Holders – above 6% makes extra payments very attractive.
  • Secure Income Earners – with stable jobs and emergency funds established.
  • No High-Interest Debt – pay off credit cards first (they cost more).
  • Maxed Retirement Contributions – after capturing employer 401k match.
  • Long-Term Stayers – planning to keep the home for many years.

When NOT to Pay Extra

Consider these factors before making extra mortgage payments:

  • No Emergency Fund: Build 3-6 months of expenses first.
  • High-Interest Debt: Pay off credit cards (18-29%) before mortgage (3-8%).
  • Missed 401k Match: Capture free employer matching money first.
  • Prepayment Penalties: Check your mortgage for early payoff fees.
  • Tax Advantages: If itemizing deductions, mortgage interest is deductible.

Frequently Asked Questions

How much should I pay extra on my mortgage?
Any amount helps, but $100-300 per month creates meaningful impact. Use this calculator to find your personal sweet spot—where you save significantly without straining your budget.
Should I pay extra monthly or in lump sums?
Monthly payments save slightly more interest because they reduce principal immediately. However, lump sums work better for irregular income (bonuses, tax refunds). Both approaches work well—choose what fits your cash flow.
Will my lender apply extra payments to principal?
You must specify "apply to principal" when making extra payments. Some lenders automatically apply extra to future payments unless you instruct otherwise. Check your online payment portal or call to confirm the process.
Is it better to pay off mortgage or invest?
Historically, stock market returns (7-10%) exceed mortgage interest (3-7%). However, paying off mortgage provides guaranteed returns, reduced risk, and psychological benefits. Many people split the difference—some extra to mortgage, some to investments.
Can I recast my mortgage instead of refinancing?
Recasting (re-amortization) recalculates payments after a large principal payment but keeps your rate. It's cheaper than refinancing ($200-500 vs $3,000-8,000) but not all lenders offer it. Great option if you have a good rate.
What about one-time large principal payments?
Large lump sums (inheritance, sale proceeds, etc.) make significant impact. A $20,000 principal payment on a 6.5% mortgage saves about $45,000 in interest and cuts 2+ years off. Always ensure no prepayment penalties first.
Should I pay off PMI first or principal?
If you're close to 20% equity, focus there first. Eliminating PMI ($100-300/month) provides immediate monthly savings. Once PMI is gone, redirect that amount to principal for compound acceleration.
How do I ensure extra payments go to principal?
Online: Look for "principal only" or "extra to principal" option. By phone: Explicitly state you want payment applied to principal. By mail: Include a note specifying "apply to principal reduction." Keep records.
Does paying extra reduce my monthly payment?
No—unless you recast or refinance. Regular extra payments reduce your balance and payoff time, not your required monthly payment. Recasting after large principal payments can lower required payments.
What if I want to pay off in 15 years instead of 30?
Calculate what a 15-year payment would be, pay that amount monthly. Or calculate the difference between your current payment and 15-year payment, and pay that extra monthly. This calculator helps you find that number.
Are there tax implications to paying off mortgage early?
You'll lose the mortgage interest deduction, which may increase taxable income. However, you gain financial security and guaranteed returns. Consult a tax professional if this significantly affects your situation.
What's the best time to start extra payments?
The sooner the better. Extra payments in year 1 of a 30-year mortgage have 30 years to compound. Even starting 5 years in still saves significant money. Never too late to start—every extra payment helps.