What is a Mortgage Amortization Schedule?
When you take out a mortgage to buy a house, you agree to pay back the loan amount (the principal) plus interest over a specific period of time (the term, typically 15 or 30 years).
An amortization schedule is a complete table of periodic loan payments. It breaks down every single payment you make from the first month to the very last, showing exactly how much of each payment goes toward interest and how much goes toward paying down the principal balance.
How Does Mortgage Amortization Work?
In a standard fixed-rate mortgage, your total monthly payment (excluding taxes and insurance) remains exactly the same for the entire life of the loan. However, the composition of that payment changes every single month.
- Early Years (Heavy Interest): In the beginning, your loan balance is at its highest, so the interest charge is also at its highest. A massive portion of your monthly payment goes toward paying the interest, while only a small sliver reduces your principal.
- The Tipping Point: As you slowly pay down the principal, the amount of interest charged each month decreases. This means a larger portion of your fixed payment starts going toward the principal. Eventually, you hit a tipping point where more of your payment goes to principal than interest.
- Later Years (Heavy Principal): Toward the end of your loan term, almost your entire monthly payment goes toward the principal, and very little goes toward interest.
Why Use an Amortization Calculator?
- See the True Cost of Your Home: Looking at the "Total Interest" figure can be shocking. It highlights how much you are actually paying for the privilege of borrowing the money.
- Evaluate a 15-Year vs. 30-Year Mortgage: While a 15-year mortgage has higher monthly payments, you will pay substantially less total interest. Run the numbers to see exactly how much you can save by choosing a shorter term.
- Plan for Refinancing or Selling: If you plan to sell your house in 7 years, use the schedule to see exactly what your remaining balance will be at month 84.
- Visualize Extra Payments: Even a small extra payment each month goes 100% toward the principal, which reduces the total interest you pay and shortens the life of your loan. (This calculator provides the baseline; if you plan constant extra payments, you will finish faster!)