First year rates - cars registered on or after 1 April 2010 (based on fuel type and CO2 emissions)
The rates in the table below are only payable for a vehicle’s first tax disc taken out at first registration. All other tax discs will be charged according to the standard rate tables shown above.
Petrol car (TC48) and diesel car (TC49)
Band
CO2 emission (g/km)
12 months rate
6 months rate
A
Up to 100
£0.00
Not available
B
101-110
£0.00
Not available
C
111-120
£0.00
Not available
D
121-130
£0.00
Not available
E
131-140
£120.00
£66.00
F
141-150
£135.00
£74.25
G
151-165
£170.00
£93.50
H
166-175
£275.00
Not available
I
176-185
£325.00
Not available
J
186-200
£460.00
Not available
K
201-225
£600.00
Not available
L
226-255
£815.00
Not available
M
Over 255
£1,030.00
Not available

Above are the new tax rates for first reg after 1st April 2010.

If you import a car into the UK then the first year rates may apply. A bit like here in Portugal.

The tax rates below are from the second year on.

Standard rates - The following table contains the rates of vehicle tax for already registered cars.
Petrol car (TC48) and diesel car (TC49)
Band
CO2 emission (g/km)
12 months rate
6 months rate
A
Up to 100
£0.00
Not available
B
101-110
£20.00
Not available
C
111-120
£30.00
Not available
D
121-130
£100.00
£55.00
E
131-140
£120.00
£66.00
F
141-150
£135.00
£74.25
G
151-165
£170.00
£93.50
H
166-175
£195.00
£107.25
I
176-185
£215.00
£118.25
J
186-200
£250.00
£137.50
K*
201-225
£270.00
£148.50
L
226-255
£460.00
£253.00
M
Over 255
£475.00
£261.25

* Band K includes cars that have a CO2 figure over 225g/km but were registered before 23 March 2006