Mortgage Payment Breakdown Calculator

See how your mortgage payment splits between principal and interest over time.

By Konstantin Iakovlev · Updated April 2026 · Source: CFPB — Owning a Home

$
%

Monthly Payment

$2,212.24

Total Interest

$446,405.71

Payment Breakdown

First Payment - Principal$316.40
First Payment - Interest$1,895.83
Last Payment - Principal$2,200.32
Last Payment - Interest$11.92
Total Interest Paid$446,405.71
Total Cost$796,405.71

Use the Mortgage Payment Breakdown Calculator above to calculate your results. Enter your values and see instant results — all calculations run in your browser.

Disclaimer: This calculator is for informational purposes only and does not constitute tax, financial, or legal advice. Results are estimates based on the information you provide and current rates. Always consult a qualified tax professional or financial advisor for advice specific to your situation.

How It Works

Every mortgage payment splits into two parts, principal and interest, and the proportion shifts steadily as the loan ages. Seeing that split laid out matters for planning, especially with rates expected to settle near 6.5% for a 30-year fixed mortgage in early 2026, a level that keeps the interest share of those first payments stubbornly high.

The breakdown rests on the standard amortization formula, P = L[c(1 + c)^n]/[(1 + c)^n – 1], in which P is the monthly payment, L is the loan amount, c is the monthly interest rate (annual rate / 12), and n is the number of months. From that fixed payment the tool walks the loan month by month, computing each month's interest as the outstanding balance times the monthly rate and treating whatever's left of the payment (monthly payment minus interest paid) as principal.

Most people are startled by the total interest a loan accrues across its full life, and laying it out plainly is half the point of this view. The other half is showing the payoff from extra principal: paying down even a little above the required amount each month shrinks both the time to payoff and the lifetime interest, and it's one of the fastest ways to build equity.

Example: 2026 Mortgage Payment Breakdown

  1. 1 Input a loan amount of $350,000, an annual interest rate of 6.5% (a realistic projection for early 2026), and a loan term of 30 years (360 months).
  2. 2 The calculator will compute your monthly payment, then generate an amortization schedule showing how much of each payment goes towards principal and interest for every month of your loan.
  3. 3 For this example, your initial monthly payment would be approximately $2,212.87. In the first month, around $1,895.83 would go to interest and only $317.04 to principal. By month 180 (halfway), the principal portion would be significantly larger.
  4. 4 This breakdown clearly demonstrates the 'front-loading' of interest in a mortgage. Early payments are predominantly interest, while later payments contribute more heavily to reducing your principal balance. This insight can help you decide if making extra principal payments is right for your financial goals.

Source: CFPB — Owning a Home · Last updated: April 2026

Frequently Asked Questions

How much of my mortgage payment goes to interest vs principal?
In the early years, most of the payment goes to interest. On a $300,000 30-year mortgage at 6.5%, about 73% of the first payment is interest ($1,625) and 27% is principal ($271). By year 15, the split is roughly 50/50.
When does my mortgage payment start paying more principal than interest?
For a 30-year mortgage, the crossover point typically occurs around year 17-20 depending on the interest rate. Higher rates push the crossover later. For a 15-year mortgage, the crossover happens much sooner, around year 5-7.
Does making extra principal payments save a lot on interest?
Yes. Adding $200 extra monthly to a $300,000 30-year mortgage at 6.5% saves over $100,000 in interest and pays off the loan about 7 years early. Even one extra payment per year shaves 4-5 years off the loan term.

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