Loan Amortization Schedule
Fixed-payment loan schedule: per-period interest, principal and balance, total interest, early payoff with extra payments, and the crossover period where principal first exceeds interest
annuity-amortizationv0.1.0Fixed-payment (annuity) amortization, nominal APR convention r = annualRate/12, integer-cent arithmetic with forced final-period payoff
Workspace
Local or server · same path as API
finance/loan-amortizationYYYY-MM. Labels the schedule; changes no amount.
Extra payments
Extra payments cut principal on the period they land, which cuts every later period's interest. The rate and the scheduled payment stay the same.
Enter a loan amount, a rate and a term to see the schedule.
Same engine as the API. The math runs on your loan terms only; nothing is uploaded or stored.
API
forge.finance.loan_amortizationSame contract as the page. Use an authenticated key in production.
curl -X POST 'https://forge.nebutra.com/v1/tools/finance/loan-amortization/invoke' \
-H 'Authorization: Bearer sk-sailor-…' \
-H 'Content-Type: application/json' \
-d '{
"example": true
}'