Tricount's default currency is USD. Shared expenses are split 50/50 between **KTVT** and **LKMS**. Original currencies are preserved for couple-only expenses.
## Ledger rules
- Every project document that confirms an actual booked or paid expense must have exactly one corresponding row below; duplicate references to the same expense do not create duplicate rows.
- Candidate prices, TBC amounts, refundable deposits, and optional estimated fees are not expenses.
- If the payer is unclear, ask the user—never infer it.
- Ignore differences below US$1 when they plausibly come from currency conversion or rounding.
- Recalculate the settlement after every table change and keep only the final net result.
