How to split the cost of a vacation

A trip is the single largest discretionary cost most households have, it is paid across five or six months in unequal pieces by different people, and it is almost never written down. That combination is why so many holidays end with a slightly awkward conversation, and why some end with one person quietly out of several hundred dollars.

Almost all of that is preventable with about ten minutes of agreement before anybody books anything.

Three things to agree before booking

• What counts as shared. Accommodation, flights, car hire and groceries almost always. Restaurants, activities and drinks, decide explicitly — this is where most of the disagreement actually lives.
• How it splits. Evenly is the default for friends and is usually right. For a couple, use whatever rule you use at home rather than inventing a holiday rule.
• Who fronts what, and when they get paid back. This is the one people skip and it is the one that costs somebody money.

The booking problem

Trips are booked in advance and in large pieces. One person puts $3,000 of flights on a card in January for a trip in June. Even if everybody settles up perfectly afterwards, that person has carried the group's money for five months.

The fix is to transfer at the moment of booking rather than at the end of the trip. It is not that anybody is at risk of not being paid back. It is that carrying somebody else's $1,000 for five months is a real thing to be asked for, and it is easier to handle when it is named than when it is assumed.

💸If a transfer at booking is not practical, at least write the amount and the date down. A cost paid five months before the trip is the one most likely to be forgotten when the settle-up happens.

During the trip

Keep it to amounts, not items. Who paid, how much, roughly what for. Anything more detailed than that will not survive a week of actually being on holiday, and anything less will not be enough to settle with.

One habit does most of the work: whoever pays says the number out loud and somebody writes it down, immediately. Reconstructing a week of spending from memory and a pile of card notifications is the part everybody dreads, and it is entirely optional.

Squaring up afterwards

Net it down. Do not have six people send five transfers each. Total what each person paid, total what each person owed, and calculate the smallest set of transfers that settles everybody. With four people the naive version can be twelve transfers and the netted version is usually two or three.

Do it within a week of getting back, while everybody still remembers the trip fondly. This sounds like a joke and is not: the same message is received completely differently at day three and at day forty.

When somebody cannot afford it

This is the hardest part of a group trip and it is almost always handled by nobody mentioning it until the plans are already made.

Raise the budget before the destination. 'What are we thinking, roughly' asked at the start is a normal question that anybody can answer honestly. The same question asked after somebody has found a place and sent photos of it is a much harder one, and the usual outcome is that a person agrees to something they cannot comfortably pay for and spends the trip worrying about it.