How exchange rates change between expense and settlement
Last updated by The EvenRound team.
You spent €1,200 in Lisbon. By the time the group settled, sterling had moved 2%. Does the bill change?
There's an awkward gap between when you spend money abroad and when the group settles up. During that gap, exchange rates move. Whether the bill 'changes' depends entirely on which model your app uses - snapshotted (the spend is fixed) vs live (the spend re-converts at settlement). Understanding which one your app uses is critical to interpreting the numbers it shows you.
The 'gap' problem
From day-of-spend to day-of-settle is typically 1-21 days. In that window, currency pairs can move 0.5-5%. For a small trip this is noise; for a €10,000 multi-week trip with a slow settler in the group, this is real money. The model your app uses determines who absorbs the difference.
Snapshot model: cost is fixed
Snapshot apps record the cost in the settlement currency at the moment of expense. €40 spent in Lisbon when GBP/EUR was 0.85 = £34 forever. If sterling moves 3% by settlement day, the £34 doesn't change. The actual money transfer (Wise, Revolut, bank) happens at the day-of-settlement rate, which might be £33.50 or £34.50 - but both parties agreed on £34, so any small variance is absorbed by the rail's fees, not the group's settlement plan.
Live model: cost recalculates
Live apps re-convert at settlement. The €40 spend becomes £33.50 or £34.50 depending on the day. This adds ambiguity - neither party has a 'fixed' number. It also means the slow settler benefits if their currency strengthens and loses if it weakens. Most apps that started as live have moved toward snapshot for this reason.
What about hedging?
Some advanced users hedge. If you're spending €5,000 and your home is GBP, you can buy €5,000 of EUR via a forward contract before the trip - locking your exchange rate. This is overkill for personal trips but reasonable for company-paid travel where the company wants P&L predictability. Almost no group expense apps support hedging directly.
What to tell the group
Be transparent. 'We're using snapshotted rates from the ECB at the time of each expense. The settlement plan won't change if FX moves between now and Sunday.' Most groups find this fair and stop worrying about FX entirely.
Snapshotted rates with mid-market sourcing are the only fair model for group trip expenses. Live rates create unfairness across slow settlers; bank rates compound spreads. Pick an app that uses snapshot + mid-market.