Last Updated: 12 October 2026
Nothing empties your holiday fund quite like spending money you never expected to spend. The flight looked cheap, the hotel seemed within budget – and you’d even planned for meals. Then the little extras began to appear. One by one, they all pile up. And by the end of the trip, they’re one of your biggest expenses.
It’s the small purchases that do the damage
You usually don’t blow the budget on one extravagant meal. Instead, it disappears through habits. You buy a coffee while waiting for a train, grab bottled water because it’s hot, pay to use a station toilet and pick up snacks between sightseeing stops. Repeat that several times a day and you’ve spent far more than you realise.
The same goes for your bank card. A few pounds in foreign transaction charges or ATM fees might not seem worth worrying about until you’ve paid them half a dozen times. Checking your bank’s overseas fees before you travel gives you a clearer idea of when it’s cheaper to withdraw cash or simply tap your card.
Cheap transport isn’t always cheap
A bargain airfare gets plenty of attention, but it’s only part of the journey. You still have to reach the airport, get from the arrivals hall to your accommodation and find your way around once you’re there. These are the costs that don’t appear in the glossy adverts.
Budget airlines know this better than anyone. Adding luggage or choosing a seat can push the final price well beyond the headline fare. Looking at the complete cost before booking often changes which option offers the best value.
The bill doesn’t always end at check-in
Accommodation can come with its own surprises. Local tourism taxes and resort fees sometimes appear later in the booking process or when you arrive, making the room cost more than you expected.
The same principle applies if you’re hiring a vehicle. Fuel, parking and car insurance all deserve a place in your budget, rather than becoming an afterthought.
It’s also worth knowing what you’d do if something went wrong on the road. I’ve covered what to do after a car accident while travelling, so you’re not left working it out on the spot.
Mobile data is another expense that catches people out. Using your usual tariff abroad without checking the costs can produce an unpleasant surprise a few weeks after the holiday ends.
Keep some money for the stories you didn’t plan
Not every unexpected expense is bad. You might meet other travellers who invite you on a sunset boat trip or stumble across a brilliant local food tour. You might need to buy an extra layer when the weather suddenly turns. Those moments often become the highlights of the trip, and yet they’re impossible to predict.
Less enjoyable surprises deserve attention too. Replacing a lost charger or covering the cost of a missed connection usually means spending money immediately, even if travel insurance refunds you later.
A little preparation buys peace of mind
The easiest way to avoid overspending is to budget for costs that don’t appear in the brochure. Booking things like airport transfers and a local eSIM before you leave often works out cheaper than arranging them on arrival.
Setting aside another 10 to 15% of your total budget also means the inevitable surprises stay as minor inconveniences instead of becoming expensive regrets.
