mortgagemath vignettes

Cent-accurate mortgage amortization for Python

Library version: 0.7.0 · Rendered by Quarto.

mortgagemath is a stdlib-only Python library that produces amortization schedules reproducing published lender, regulator, and textbook examples to the cent. Decimal end-to-end, configurable rounding, balance-tracking, day-count, compounding, and payment cadence; convenience constructors for common US, Canadian, and Actual/360 loans; full ARM support (rate changes, optional recast, optional payment caps with negative amortization).

Vignettes

Vignette	Audience	Length
Library at a glance	Evaluating fit in 60 seconds	1 page
Validation against published sources	Audit / risk review	2 pages
Worked examples	Picking the right configuration for your loan type	~10 pages
A short history of the level-payment mortgage	Historical / academic context	6 pages

Each vignette is also available as a PDF (built deterministically from the same source).

Source

Repository: github.com/murraystokely/mortgagemath · PyPI: mortgagemath · Vignettes licensed CC-BY-4.0; library code MIT.