Preview a rule change

FILES

Transactions CSV Baseline rules — what runs today

Candidate rules — the proposed change

HTML report

My file isn't a UK/US-style CSV

Day-first dates Decimal separator Thousands separator Encoding Header mapping (.json) — needed if your columns aren't date/amount/counterparty/memo

WHY THIS SCREEN HAS NO OTHER TICKS

Impact can't run with verify or reconcile — the engine refuses, in its own words: "impact expects differences by design" and "impact compares two rulepacks; reconcile compares against an external system." One question per run.

comparing…

Results

Baseline vs candidate over the same data. It won't say which is right — it says exactly what changes if you switch.