← Finance & audit
An amortisation schedule that computes the same way twice
The same workbook plus the same pinned context is the same grid, today and in five years. That is the property that makes a number defensible rather than merely plausible.
workbook.truecalc.appOpen in full
- Monthly payment
- 1,403.83
- Interest, month 1
- 1,125
- Balance after three months
- 249,159.74
B4
C7
E9
Verified at build timeThese figures are produced by running the grid above through the engine during the build. If the engine ever disagrees with them, this page does not ship.
Recalculation takes an explicit context — a timestamp, a timezone and a random seed — so a model that touches NOW or RAND still reproduces exactly. Nothing here depends on when you opened the page.
Take it further
Shipped for the engine and the workbook format. The explainability layer above it — showing how a number was derived — is not released.