Why this is the job everyone hates
Ask any partnership treasurer what actually consumes their time and it is almost never the hourly maths. It is chasing four people for photographs of crumpled receipts from three different FBOs, two of which print on thermal paper that has already faded.
The reason it is hard is structural. A fuel receipt is created at an unpredictable time, at an unpredictable place, by someone who is tired and wants to get home, and it has to survive until the person doing the books needs it — which might be five weeks later. Almost every step of that chain is designed to fail.
The three failure modes
The receipt never arrives. The partner meant to send it, put it in a flight bag, and found it in March. By then the month is closed and re-opening it means issuing corrections.
The receipt arrives detached from context. A photo of a receipt in a group chat with no flight attached. Now the treasurer has to work out which flight it belongs to, and if two partners flew that week, guess.
The receipt is illegible. Thermal paper in a hot cockpit for three weeks is a blank strip. There is no recovering this; the partner is now relying on memory, and memory rounds in the partner's favour.
The fix is capture at the point of purchase
Every workable process has the same shape: the receipt is captured at the pump, attached to the flight it belongs to, before the pilot leaves the aircraft.
Not "later that day." Not "when I get home." At the pump, while the receipt is still in hand and the flight is still the thing the pilot is thinking about. Anything that defers capture reintroduces all three failure modes.
In practice that means the flight log and the receipt capture have to be the same thirty-second action on a phone, and it has to work with no signal, because a lot of fuel pumps are at fields with no coverage. If your process requires the pilot to remember to do a second thing later, the process is already broken.
What to record
Four fields, and only four, or compliance collapses:
- Total paid — the number that gets credited
- Gallons — lets you cross-check against hours flown
- The photo — the evidence, before the paper fades
- Which flight — usually implicit if capture happens inside the flight log
Location and fuel grade are nice to have and not worth the friction of asking for them. If you need them later, they are on the photograph.
The cross-check that catches errors
Once a quarter, divide total gallons purchased by total hours flown. Compare that to your aircraft's expected burn.
If your Cherokee should burn about 9.5 gallons an hour and the ratio comes out at 11.2, something is wrong — a receipt double-entered, a fuel purchase for a different aircraft, or someone claiming a personal fill. If it comes out at 7.8, receipts are going missing and partners are quietly out of pocket.
This single check takes two minutes a quarter and catches nearly every category of fuel error. Very few partnerships do it.
Dealing with the receipt that shows up late
It will happen. The rule to agree in advance is a cut-off — commonly the end of the following month — after which a receipt is not credited retrospectively but is credited against the current period.
This matters more than it sounds. Re-opening a closed month means reissuing statements that partners have already seen, possibly already paid, and any group that does that casually ends up with books nobody trusts. Credit it forward, note why, and keep closed months closed.
If your system handles corrections properly — voiding the old invoice with a credit memo and issuing a replacement — then late receipts are survivable. If corrections mean editing a cell in a spreadsheet, they are not, because six months later nobody will be able to explain why a number changed.
When the aircraft has a fuel card
Some groups issue a shared fuel card, which eliminates the credit problem entirely: the group pays for all fuel directly and the wet rate simply has to cover it. This works well and removes the largest source of admin in a partnership.
The trade-off is control. A shared card means any partner can buy fuel at any price without a conversation, and the group carries all the price risk. Groups that do this successfully usually pair it with a simple norm — tanker from home when it is practical — rather than a rule nobody enforces.