The problem fuel credits solve
Your partnership quotes a wet rate — say $95 an hour on a Cessna 182 — which assumes the group buys the fuel. Then a partner flies to a fly-in three states away and buys 42 gallons at $8.10 because that is what the FBO charges.
If nothing is done, that partner has paid twice: once through the wet rate, and again at the pump. Over a season this is how a partner quietly concludes the arrangement is unfair and starts flying less.
A fuel credit reverses the double charge. The principle is simple: the wet rate assumes the group pays for fuel, so any fuel the pilot paid for personally comes back off their bill.
The basic calculation
For a single flight:
Flight charge = (meter hours × wet rate) − fuel purchased by pilotWorked through, on a 2.4-hour flight at $95/hr wet, where the pilot bought 42 gallons for $340.20:
- Flight time: 2.4 × $95 = $228.00
- Fuel credit: −$340.20
- Net: −$112.20 — a credit to the pilot
That negative number is correct and it surprises people. The pilot bought more fuel than that flight consumed, so the group owes them. The excess sits in the tanks for whoever flies next, and the credit carries forward against their next invoice or their monthly dues.
Mistake one: crediting the retail price you wish you'd paid
Some groups credit fuel at the home-field price rather than what the pilot actually paid, reasoning that partners should not be rewarded for buying expensive fuel.
This is a mistake in a wet-rate group. The pilot did not choose to pay $8.10; they chose to fly somewhere, and that is the fuel that was available. Crediting at home price makes cross-country flying more expensive than local flying by an amount nobody agreed to, and it punishes exactly the flying most people bought a share to do.
If your group genuinely wants to discourage expensive fuel stops, do it with a written policy — "tanker fuel from home where practical" — not by quietly under-crediting.
Mistake two: crediting gallons instead of dollars
Crediting a fixed dollar-per-gallon rate rather than the receipt total introduces the same distortion in a subtler form, and it breaks entirely when fuel prices move. Credit the receipt. The receipt is the fact.
Where the reserve fits
Fuel credits must not touch the engine reserve. The reserve accrual is a function of hours flown, not of who bought fuel. On the flight above:
- Hours flown: 2.4
- Reserve rate: $25.50/hr
- Into the engine fund: 2.4 × $25.50 = $61.20
That $61.20 moves into the reserve regardless of the fuel credit, and regardless of whether the partner's net invoice was positive or negative. Groups that net the reserve against fuel credits end up with an engine fund that mysteriously stops growing during the summer, which is precisely when it should grow fastest.
Handling a credit balance
Three workable approaches, in order of how much bookkeeping they cause:
- Carry forward. The credit sits on the partner's account and offsets the next invoice or the next dues run. Simplest, and what most groups should do.
- Settle in cash. The group pays the partner out. Cleanest for the partner, but means the operating account needs enough cash to do it.
- Cap and settle annually. Carry forward during the year, settle anything still outstanding at year end. Reasonable middle ground for groups with tight cash.
Whichever you pick, put it in the agreement. A partner sitting on a $400 credit they did not expect to be waiting for is a partner with a grievance.
What the record should show
Every credited receipt should carry four things: date, gallons, total paid, and which flight it attaches to. If you ever have to unpick a year of billing — and you will, the first time someone leaves the partnership — the gallons let you sanity-check against hours flown, and the flight link lets you rebuild any single month.
A photograph of the receipt attached to the flight record is worth more than a spreadsheet cell containing $340.20, because in eighteen months the spreadsheet cell will be the only thing anyone remembers and nobody will be able to verify it.