Instant Book is the OTA setting where a guest can confirm a reservation immediately — card charged, calendar blocked, confirmation email sent — without waiting for the host to approve the request. Almost every major OTA offers it: Airbnb, Booking.com (where it's the default for most listings), Vrbo, Expedia.

Instant Book sits at one end of a spectrum. On the other end is "Request to Book," where the host has 24 hours to read the guest's profile and decide whether to accept. Hosts who turn Instant Book off trade volume for control.

What Instant Book actually changes

Three things happen when you turn it on:

Booking conversion goes up. Guests browsing on mobile, comparing four options, often book the first listing that's confirmable in one tap. Listings without Instant Book lose those impulse bookings.
OTA ranking weight increases. Airbnb explicitly boosts Instant Book listings in search ranking. Booking.com effectively requires it on most listings. Vrbo factors it in.
Your screening time disappears. With Request to Book, you read the profile, the trip purpose, the guest count, and decide. With Instant Book, the booking is confirmed before you've seen any of it.

The trade-off is not symmetric across hosts. A high-trust property in a low-friction market (urban apartment, business travelers) loses very little by turning Instant Book on. A property where bad guests cause real damage (rural cabin, large group venue, anything that can host parties) can lose the property's insurance status by accepting a booking from someone who would've been rejected on review.

Guest filters — the middle ground

All three majors let you turn on Instant Book with conditions. Common filter options:

Verified ID required. Guest has uploaded a government-issued ID to the platform.
Reviews from past hosts. A minimum number of positive past reviews.
No same-day bookings. Forces a 24-hour buffer that gives you time to react.
Trip purpose stated. Forces the guest to write a sentence about why they're booking.

The recommended pattern for first-year hosts: Instant Book ON with verified ID + ≥1 past review + no same-day. Catches roughly 80% of the volume upside while filtering most of the highest-risk profiles.

Booking.com is different

On Booking.com, Instant Book isn't really optional. The platform's standard contract assumes the booking is binding the moment a guest hits confirm. There's no "request" mode for most listings; if you reject a Booking.com confirmation, you take a relocation cost and a ranking penalty.

The screening on Booking.com happens after the booking — through your cancellation policy, deposit policy, and house rules at check-in. Different control surface, same goal.

When to keep it off

Three scenarios where most hosts turn Instant Book off:

Brand-new listing. First 5-10 stays should be carefully chosen guests so you build a clean review base. Turn Instant Book on once you have ≥10 5-star reviews.
High-risk property. Large-group venues, party-prone city centers, properties with expensive furniture or sensitive neighbors.
Owner-occupied portion. If you live in part of the property, screening matters more.

Hosts running a portfolio sometimes use a hybrid: Instant Book on for the safest listings, off for the highest-risk ones. The OTAs let you set this per-listing.

Direct booking comparison

On your own direct booking widget, Instant Book is whatever you want it to be. Some hosts mirror the OTA settings (instant booking with ID required); some require a deposit before confirming; some keep direct bookings strictly request-only because direct guests are higher-trust by default.

The choice is yours when you own the booking flow. The OTAs constrain it.