Rental glossary
Plain-English definitions of the car & vehicle rental terms operators deal with daily — deposits, waivers, fleet metrics, and the local payment methods used across Thailand, Vietnam and beyond.
Bookings & availability
- Reservation
-
A confirmed booking that holds a specific vehicle for a customer over set pickup and return dates. A reservation should lock that vehicle’s availability so it can’t be booked twice.
- Availability
-
Whether a given vehicle is free to rent for a date range. Real-time availability across every channel (online, walk-in, chat) is what prevents double-bookings.
- Double-booking
-
When the same vehicle is reserved by two customers for overlapping dates — usually because availability wasn’t shared in real time. It forces a cancellation, refund, or last-minute swap.
- No-show
-
A customer who books but never arrives to pick up the vehicle. Deposits and automatic reminders are the usual ways to reduce no-show losses.
- Online booking
-
Letting customers reserve and pay for a vehicle themselves through a web page or link, 24/7, instead of every booking going through a manual message or call.
Payments & deposits
- Security deposit
-
A sum held against potential damage, fuel, fines, or late return, refunded after the vehicle comes back in order. It can be charged or pre-authorized on a card or via local rails like PromptPay.
- Pre-authorization (pre-auth)
-
A temporary hold placed on a customer’s card for the deposit amount without actually charging it. The hold is released on return if there’s no damage, avoiding a real charge and refund cycle.
- Deposit hold
-
The active block of funds (via charge or pre-authorization) covering the security deposit during a rental. It’s released or refunded once the return inspection passes.
- PromptPay
-
Thailand’s instant bank-transfer system using QR codes or a phone/ID number, with no card fees. Widely used for rental payments and deposits by walk-in customers in Thailand.
- MoMo
-
A leading Vietnamese mobile e-wallet for instant payments via QR or phone number. Common for taking rental payments and deposits from local customers in Vietnam.
- Commission
-
A per-booking cut taken by a platform or marketplace. A 0%-commission model means the operator keeps the full rental revenue and isn’t charged on each booking.
Contracts & legal
- Rental agreement
-
The contract between operator and customer covering vehicle details, rates, deposit, insurance, mileage, and return terms. A bilingual, digitally-signed agreement is easier to enforce in a dispute.
- Collision Damage Waiver (CDW)
-
An option that limits the customer’s financial responsibility for damage to the rented vehicle, usually down to a fixed excess. It’s a waiver of liability, not strictly insurance.
- Excess (deductible)
-
The capped amount a customer still pays toward damage even with a waiver or insurance in place. A lower excess means less risk for the customer and is often an upsell.
- Liability insurance
-
Cover for damage or injury the renter causes to third parties (other people, vehicles, or property). It’s distinct from a damage waiver, which covers the rented vehicle itself.
- Damage waiver
-
A general term for an add-on that reduces the customer’s liability for damage to the vehicle in exchange for a daily fee, typically leaving only the excess payable.
- Mileage limit
-
A cap on the distance included in the rental rate, beyond which a per-kilometre charge applies. Unlimited mileage removes the cap and is a common selling point.
Operations & fleet
- Fleet
-
The full set of vehicles an operator rents out. Fleet management covers tracking each vehicle’s status, location, maintenance, and earnings.
- Turnaround time
-
How long it takes to get a returned vehicle cleaned, inspected, and ready to rent again. Shorter turnaround means higher utilization and revenue.
- Handover (check-in)
-
Giving the vehicle to the customer at pickup — verifying ID and licence, signing the agreement, recording condition and fuel, and collecting the deposit.
- Return inspection (check-out)
-
Examining the vehicle when it comes back to log fuel, mileage, and any new damage against the handover record before releasing the deposit.
- Telematics / GPS tracking
-
In-vehicle hardware that reports location, mileage, and usage. It helps recover vehicles, verify mileage, and monitor utilization across the fleet.
Business metrics
- Utilization rate
-
The share of available days a vehicle is actually rented — for example, rented 21 of 30 days is 70%. It’s the core efficiency metric for a rental fleet.
- Average Daily Rate (ADR)
-
Total rental revenue divided by the number of rented days — the average price earned per vehicle per day. ADR and utilization together drive revenue.
- Dynamic pricing
-
Adjusting rental rates by demand, season, day of week, or how much of the fleet is booked, instead of a single fixed price. Done well, it lifts both utilization and ADR.