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Extra principal vs remaining interest

Mortgage Payoff Calculator

See how extra principal changes the remaining payoff date and interest on the current mortgage balance.

Your numbers

Mortgage payoff

How extra principal changes remaining interest and the payoff date.
$
%
months
$

Pay off sooner by

5 years 4 monthsEstimated payoff 2046-04-01
Scheduled P&I$1,610.75
Interest saved$57,646
Baseline remaining interest$233,226
How we got this
  1. Scheduled P&I$1,610.75
  2. Months saved5.3 years sooner64
  3. Interest saved$57,646.33
What we assumed
  • The remaining payment is derived from the current balance, rate, and remaining term using the same amortization primitive as the Mortgage Payment Calculator.
  • Extra principal is added every month. Taxes, insurance, and escrow are not included.
  • This is not a lender recast, refinance analysis, or financial advice.
Technical details

Method mortgage-payoff-v1.0.0Data Manual inputs / fixed rules

Guide

What extra principal does to a mortgage

CostAnswer editorialIndependent calculator publisher

Extra principal shortens the remaining schedule and cuts interest. The page uses the current balance, rate, and remaining term, then applies the extra amount you type. It does not decide whether you should prepay versus invest.

Interest saved is not a rate of return

Paying extra is a guaranteed reduction in interest at your mortgage rate, after any tax deduction you actually itemize. That is not automatically better than a retirement contribution or an emergency fund. The calculator only shows the loan math.

Questions about this calculator

How much interest do I save by paying extra each month?

Type the remaining balance, rate, remaining term, and extra principal. The page prints a new payoff date and interest saved versus the original remaining schedule.

Is extra principal better than refinancing?

They solve different problems. Extra principal keeps the same rate and cuts term. A refinance changes the rate and usually resets fees. Run both pages; neither is advice.

Terms used here

Extra principal
An amount applied to the balance on top of the required payment. It is not a fee to the lender.
Remaining term
Payments left, not the original 30 years.

Practical tips

  • Confirm with the servicer that extra amounts are applied to principal, not held as a cushion.
  • A one-time lump sum and a monthly extra are different inputs; do not mix them in one field.

Limits and caveats

  • Not investment advice. Prepaying a 3% mortgage while carrying 20% credit-card debt is a different decision than the math on this page.

Results are for information. They are not legal, tax, medical, or financial advice. How the math is maintained · Report a wrong figure.

Engine notes

Rounding, versioning, and omissions that sit beside the guide rather than repeating it.

  • Baseline vs extra. The remaining payment is derived from current principal, rate, and remaining term with the same amortization primitive as Mortgage Payment. Extra monthly principal is then applied every month.
  • Primary result. Years and months saved, plus an estimated payoff date when a start date is present. Interest saved is secondary.
  • What is left out. Taxes, insurance, escrow, lender fees, and one-time extra payments beyond the monthly extra field are not a full payoff strategy engine.

Calculation receipt

What each number here is

This answer is arithmetic on what you enter. No outside dataset is involved, so nothing here can go out of date.

Extra-payment savings fall out of the amortisation schedule.

Sources

Where this data comes from

Consumer Financial Protection BureauHow extra principal can shorten an amortizing mortgage.Official guidance ↗

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