Schedule of principal and interest
See principal, interest, and remaining balance by payment for a fixed-rate loan. The payment uses the same engine as the Loan Calculator.
Your numbers
Monthly payment
$1,199.10360 payments| # | Date | Payment | Principal | Interest | Balance |
|---|---|---|---|---|---|
| 1 | 2026-09-01 | $1,199.10 | $199.10 | $1,000.00 | $199,800.90 |
| 2 | 2026-10-01 | $1,199.10 | $200.10 | $999.00 | $199,600.80 |
| 3 | 2026-11-01 | $1,199.10 | $201.10 | $998.00 | $199,399.71 |
| 4 | 2026-12-01 | $1,199.10 | $202.10 | $997.00 | $199,197.60 |
| 5 | 2027-01-01 | $1,199.10 | $203.11 | $995.99 | $198,994.49 |
| 6 | 2027-02-01 | $1,199.10 | $204.13 | $994.97 | $198,790.36 |
| 7 | 2027-03-01 | $1,199.10 | $205.15 | $993.95 | $198,585.21 |
| 8 | 2027-04-01 | $1,199.10 | $206.17 | $992.93 | $198,379.04 |
| 9 | 2027-05-01 | $1,199.10 | $207.21 | $991.90 | $198,171.83 |
| 10 | 2027-06-01 | $1,199.10 | $208.24 | $990.86 | $197,963.59 |
| 11 | 2027-07-01 | $1,199.10 | $209.28 | $989.82 | $197,754.31 |
| 12 | 2027-08-01 | $1,199.10 | $210.33 | $988.77 | $197,543.98 |
Method amortization-v1.0.0Data Manual inputs / fixed rules
Guide
Each payment is split into interest on the current balance and principal that reduces it. Early payments are mostly interest; later payments are mostly principal. The payment formula is the same engine as the loan calculator.
Interest each month is rate/12 × remaining balance. After principal is applied, the next month’s interest is calculated on a smaller balance. That is the entire mechanism. Extra principal, if you model it on the loan page, accelerates the shift.
A long amortizing loan keeps a large balance for years, so interest stays large. That is expected, not a billing error.
No. The schedule is P&I only unless you have folded other amounts into the payment you typed, which would misstate principal.
Results are for information. They are not legal, tax, medical, or financial advice. How the math is maintained · Report a wrong figure.
Rounding, versioning, and omissions that sit beside the guide rather than repeating it.
Calculation receipt
This answer is arithmetic on what you enter. No outside dataset is involved, so nothing here can go out of date.
A schedule is the closed-form payment applied period by period.
Sources