Alongside taxes, many platforms add a service fee or booking fee that only appears in the final checkout step, after the headline comparison has already happened in your head. It's usually a modest flat amount or small percentage, but because it appears late, it's the part of the price most likely to get overlooked in a side-by-side comparison.
The fee isn't hidden in a deceptive sense — it's typically disclosed before payment is taken — but its late placement in the flow means a lot of price comparisons effectively happen before the full number is visible. Two platforms that look identically priced at the search stage can diverge once each one's service fee is added at checkout.
This matters most on lower-value bookings, where a flat service fee represents a larger percentage of the total. On a $60-a-night room, a $5 service fee is a meaningfully bigger factor than the same $5 fee on a $400-a-night suite, even though the fee itself is the same.
The habit worth building is simple: don't finalize a comparison until you've clicked through to the point where the true total, fees included, is visible on both platforms. It takes an extra minute, and it's the only way to know which number is actually smaller.
