Taxes and service fees are one of the most common sources of an apples-to-oranges comparison between platforms, because different sites handle the display differently — some show a fully loaded total upfront, others show a lower headline price with taxes added at the final step, and the gap between the two isn't always obvious at a glance.
The headline number on one platform might be the pre-tax nightly rate, while another platform's headline number already includes local taxes and a service charge. Compared side by side without adjustment, the second platform can look meaningfully more expensive for what is, after both totals are fully loaded, actually the same or even a cheaper stay.
The only reliable fix is to compare on a consistent basis — either both pre-tax nightly rates, or both fully-loaded totals for the same number of nights, never one of each. It sounds obvious written out, but it's easy to lose track of which basis you're looking at when comparing multiple browser tabs quickly.
This is exactly the kind of quiet, structural bias that skews comparisons without either platform doing anything dishonest — it's just a difference in when tax gets added to the number you see first, and it rewards anyone willing to read one step further before deciding which price is really lower.
