A home loan amortization book — track payoff, prepayments, and the rent-vs-buy math, side by side. No install, no server — everything runs in this page.
Loan terms
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Add a prepayment
Outstanding balance over time
Original schedule
With prepayments
Rent comparison
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Cumulative rent paid
Cumulative loan payments
Amortization schedule — edit "Extra" to add a one-off prepayment for that month