Most travellers carry a screenshot of their Booking.com confirmation and assume that settles the question of accommodation proof. It usually doesn’t — and the gap between what you have and what’s actually being asked for only becomes obvious at the worst possible moment.
What visa applications actually want
When a visa application form asks for proof of accommodation, it typically means something more formal than a booking confirmation. For Schengen applications especially, consulates often want a hotel reservation that shows it’s cancellable (proving you didn’t pay for a non-refundable room just to get the visa) or a letter from a host if you’re staying privately. Some consulates specify that reservations must be made through specific channels or include full address details, check-in and check-out dates, and your name exactly as it appears on your passport.
A forwarded email thread with a discount code in the sidebar does not inspire confidence. Print the full confirmation page, or use the booking platform’s dedicated PDF export — most have one buried under ‘booking details.‘
At land borders, it’s a different problem
Land border crossings are where the accommodation question gets genuinely unpredictable. Officers at busy overland crossings — particularly in Southeast Asia and parts of Eastern Europe — sometimes ask where you’re staying on your first night. Not always. Not consistently. But when they do ask and you open your phone to a dead battery or a booking app that’s cached three countries ago, things slow down.
Keeping a printed or clearly saved (offline) copy of your first-night accommodation, including the full address, takes about forty seconds of preparation and has gotten more than a few travellers through a queue faster.

The insurance angle nobody thinks about
Travel insurance claims for accommodation-related disruptions — a property closure, a double-booking, a safety issue that forces a move — require documentation of what you originally booked. Not a memory of it. If you booked through a third-party aggregator and the property has since vanished from the platform, recovering that confirmation can take days.
Forward every booking confirmation to an email folder labelled by trip. Old habit from the printed-itinerary era, still completely relevant.
One thing worth knowing before you arrive
Some countries — including Thailand and Indonesia at certain entry points — technically require tourists to provide an address for their first night of stay on arrival cards. In practice this is rarely enforced with any rigour, but the form still asks. Whether that changes, and how, probably depends on where tourism policy goes over the next few years.