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Vehicle Tax Calculator

Road Tax for Cars, Vans, Motorcycles & Motorhomes

Easily calculate the annual vehicle tax (road tax) for any car,  van, motorcycle or private goods vehicle based on its registration date.  Includes initial 12 months rate for vehicles under 1 year old,  and the additional rate for premium vehicles with a list price in excess of £40,000.

Key Features

New Vehicles

Calculate annual vehicle tax rate for any vehicle, including unregistered or pipeline stock.

Registered Vehicles

Covers all vehicle tax regimes by registration date, from tax exempt classic vehicles over 40 years old to vehicles registered after 1 April 2025.

Vehicle Types

Provides coverage for cars, vans, motorcycles, motorhomes and private goods vehicles.

Initial Year Tax

Included for cars registered in the last 12 months, including the changes applicable from 1 April 2025.

Premium Vehicles

Includes support for vehicles with a list price in excess of £40,000 and identifies whether the additional rate is applicable based on date of registration.

Compatible

Parameter based approach provides compatibility with all data landscapes, for easy integration with all vehicle data providers.

Pricing

PAYG
10p
Per Use
Business
5p
Per Use
Enterprise
2p
Per Use

Pricing

PlanGBPEURUSD
PAYG (Per Use)10p12c14c
Business (Per Use)5p6c7c
Enterprise (Per Use)2p3c3c

Sample Response

Documentation

Introduction

This endpoint provides the annual vehicle tax rate based on registration date, vehicle type, fuel type, CO2 value and list price.

Header

When making calls to our API, include the following header:

x-api-key:your-api-key-here

Example Request

https://api.oneautoapi.com/oneauto/vehicletaxcalculator?registration_date=2020-01-01&vehicle_type=car&engine_capacity_cc=1499&fuel_type_desc=petrol&co2_gkm=123&list_price_inc_options_delivery_vat=23456&emission_class=euro4&dvla_revenue_weight_kg=1234

Example Sandbox Request

https://sandbox.oneautoapi.com/oneauto/vehicletaxcalculator?registration_date=2020-01-01&vehicle_type=car&engine_capacity_cc=1499&fuel_type_desc=petrol&co2_gkm=123&list_price_inc_options_delivery_vat=23456&emission_class=euro4&dvla_revenue_weight_kg=1234

Request Parameters

registration_date
mandatory, string, e.g. 2020-01-01
Date the vehicle was first registered in the UK.
vehicle_type
mandatory, string, e.g. car
Class of vehicle (Car, Van, Motorcycle, Tricycle, Private Light Goods & Private Heavy Goods).
engine_capacity_cc
optional, string, e.g. 1499
Cubic capacity of the engine. Mandatory for all Motorcycles, Tricycles & Private Light Goods vehicles. Mandatory for Cars registered before March 2001.
fuel_type_desc
optional, string, e.g. petrol
The vehicle's fuel type description. Mandatory for cars registered from April 2017 to March 2024
co2_gkm
optional, string, e.g. 123
CO2 in g/km. Mandatory for cars registered from March 2001 onwards.
list_price_inc_options_delivery_vat
optional, string, e.g. 23456
List price + options + delivery price including VAT.
emission_class
optional, string, e.g. euro4
European emission standard. Value indicates the emission levels in line with the age of the vehicle.
dvla_revenue_weight_kg
optional, string, e.g. 1234
The weight of the vehicle for DVLA purposes. Mandatory for Vans, Motorcycles, Tricycles, Private Light Goods & Private Heavy Goods vehicles.

Sample Response

{
  "success": true,
  "result": {
    "12_month_rfl_y1": 220,
    "12_month_rfl_y2_to_y6": 190,
    "12_month_rfl_y2_to_y6_premium": 600,
    "is_premium": true
  },
  "error": "If there is an error the message would go here"
}

Response Parameters

success
e.g. true
Whether the api call was successful
12_month_rfl_y1
e.g. 220
Year One 12 month Road Fund Licence.
12_month_rfl_y2_to_y6
e.g. 190
Year Two to Year Six 12 month Road Fund Licence
12_month_rfl_y2_to_y6_premium
e.g. 600
Year Two to Year Six 12 month Road Fund Licence for vehicles over £40k.
is_premium
e.g. true
Is the vehicle over £40k and classed as premium for annual vehicle tax purposes.
error
e.g. If there is an error the message would go here
Details of what went wrong with the api call

Status Codes

200
success, chargeable
Request has been successfully received and a response has been sent.
202
accepted, non-chargeable
Request has been received and accepted for processing, but the action has not yet been completed.
204
no content, non-chargeable
Request has been successfully received but there is no content to return e.g. if an invalid VRM has been sent.
206
partial content, non-chargeable
Request has been successfully received but limited content is returned e.g. if an invalid VRM has been sent.
400
bad request, non-chargeable
Request was not received e.g. if any required parameters are missing.
403
forbidden, non-chargeable
Request was rejected e.g. if the API key is invalid or the service is not enabled.
429
too many requests, non-chargeable
API key rate limit/quota has been exceeded.
500
internal server error, non-chargeable
We are unable to process the request e.g. if the API is under extremely heavy load.
503
service unavailable, non-chargeable
Service is temporarily unavailable. Contact help@oneautoapi.com

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