OTA Commission Calculator: What Are You Really Paying Booking.com and Expedia?

When you sign a contract with an Online Travel Agency (OTA) like Booking.com, Expedia, or MakeMyTrip, the commission rate seems straightforward. The contract says 18%, so you assume you are paying 18% of your booking revenue for guest acquisition.

However, the simple “18% commission” represents only a fraction of the actual cost. When you factor in merchant payment fees, VAT on commissions, Genius discount obligations, search displacement costs, and the loss of direct guest relationships, the true cost of acquisition routinely exceeds 25%.

In this guide, we break down the hidden costs of third-party distribution and show you how to calculate what you are really paying.

📈 The True Cost of Acquisition Comparison

Acquisition costs differ dramatically by channel. Understanding these numbers is key to budgeting your marketing spend.

The True Cost of OTA Formula

True Cost of OTA Booking = Base Commission + Genius/Member Discounts + GST on Commission + Payment Gateway Fees + Guest Lifetime Value Loss

Let’s break these down:

1. Base Commission: Typically 15–20% of the room rate.
2. Discounts: If you participate in Booking.com Genius, you discount your rate by 10–15%. The commission is then calculated on the discounted rate, but your margin takes the hit.
3. VAT/GST: In India, a 18% GST applies to the commission invoice. If you cannot claim input tax credit (ITC) on this expense, it is a direct margin drain.
4. Guest Data Loss: When an OTA hides the guest’s real email address (e.g. replacing it with @guest.booking.com), you lose the ability to market to them for repeat stays.

Direct vs. OTA: The Break-Even Analysis

While direct bookings have costs (website hosting, booking engine fees, paid ads), these are largely fixed or cost-per-click. As booking volume increases, the unit acquisition cost of a direct booking drops significantly, whereas OTA commissions remain a flat, high percentage on every single room night.