1. The Four Primary Categories of Airline Ticket Taxes
On many international itineraries, taxes and surcharges frequently exceed the base airfare itself. GDS pricing engines evaluate hundreds of national tax statutes and IATA Resolution 728 tax rules to compute the final ticket price.
1. Government Departure & Fiscal Taxes: Levied by national finance ministries (e.g. US Transportation Tax 'US', UK Air Passenger Duty 'GB', French Solidarity Tax 'IZ').
2. Airport Passenger Service Charges (PSC) & Facility Charges (PFC): Levied by airport authorities to finance terminals, runways, and baggage handling (e.g. US PFC 'XF', London Heathrow PSC 'UB').
3. Aviation Security Charges: Dedicated funds for airport passenger screening and border security (e.g. US September 11 Security Fee 'AY', German Aviation Security Tax 'DE').
4. Carrier-Imposed Surcharges (YQ / YR): Airlines designate these codes to recover volatile fuel prices, GDS booking fees, and NDC channel costs.
2. The Most Common Global Tax Codes Reference
Here is the standard architectural decoder for the primary tax codes encountered by global travel agents and airline ticketing robots:
| Tax Code | Tax Name / Description | Jurisdiction / Levying Entity | Refundable on Non-Ref Ticket? |
|---|---|---|---|
| US | US Transportation Tax (7.5% + International Arrival/Departure) | United States Internal Revenue Service | Yes (if unflown) |
| AY | September 11th Security Fee ($5.60 per one-way) | US Transportation Security Administration (TSA) | Yes (if unflown) |
| XF | Passenger Facility Charge (PFC, up to $4.50/airport) | US Commercial Airport Authorities | Yes (if unflown) |
| ZP | US Flight Segment Tax ($5.00 per domestic segment) | US Department of the Treasury | Yes (if unflown) |
| GB | Air Passenger Duty (APD - Long haul vs Short haul) | HM Revenue & Customs (United Kingdom) | Yes (strictly refundable) |
| UB | Passenger Service Charge (Airport Departure Fee) | UK Airport Operators (e.g. Heathrow Airport Ltd) | Yes (if unflown) |
| YQ | Carrier-Imposed Fuel Surcharge / Distribution Fee | Airline Revenue Management | Depends on Cat 16 filing |
| YR | Carrier-Imposed Operational Surcharge / Booking Fee | Airline Revenue Management | Depends on Cat 16 filing |
3. The Mystery of the 'XT' Tax Code
Travel agents and passengers often wonder why their ticket receipt shows a massive single tax item labeled 'XT' (e.g. 'TAX: USD 342.50 XT').
In legacy EDIFACT and IATA ticket printing standards, the electronic ticket face was designed with exactly three tax boxes. If an itinerary contains more than three distinct taxes (which virtually every international connecting flight does), the first two individual taxes are listed in boxes 1 and 2, and the mathematical sum of all remaining taxes is consolidated into box 3 under the pseudo-tax code 'XT'.
A separate breakdown box (Tax Breakdown Record) in the ETR details every individual constituent tax making up the XT sum (e.g. 'XT: 5.60AY 4.50XF 112.00GB 85.00UB 135.40YQ').
