What happens to road tax when you change an engine?

[TheLurker]

So, you have a 1.2L car. You then drop a 2L engine in it. I guess you have to tell VOSA about it so they can update the V5c, but what happens about the road tax you pay (price) on the car?

Thought came to me whilst watching a rally car build on youtube...

Thanks.

[kambites]

VED doesn't change.

[marshalla]

http://www.direct.gov.uk/en/Motoring/OwningAVehicl...

[TheLurker]

So how do you work out how much tax you now pay? I guess if you change engine from the same make/model its easy, but what if it isn't?

[kambites]

inkiboo said:

kambites said:

VED doesn't change.

The DVLA seem to disagree.

They do? Where?

I know lots of people with Honda K20 engines in their Elises, and they all still fall in the same VED band as before the conversion.

Edited by kambites on Saturday 8th January 22:33

[jbi]

kambites said:

inkiboo said:

kambites said:

VED doesn't change.

The DVLA seem to disagree.

They do? Where?

I know lots of people with Honda K20 engines in their Elises, and they all still fall in the same VED band as before the conversion.

Edited by kambites on Saturday 8th January 22:33

indeed... how would they classify it?

you would need an independent co2 verification

[Martin Keene]

kambites said:

inkiboo said:

kambites said:

VED doesn't change.

The DVLA seem to disagree.

They do? Where?

I know lots of people with Honda K20 engines in their Elises, and they all still fall in the same VED band as before the conversion.

Edited by kambites on Saturday 8th January 22:33

The presumption there is they have also changed the V5. For cars registered before 1st March 2001 there will only be a change in the VED if you go from below 1400cc to above 1400cc or vice verse.

What the hell happens for a car registered after 1st March 2001 where it is all done on CO2, I have know idea. You can't put the car though another c0" test, so I assume it remains the same.

[jbi]

best way to get around emissions tax it seems...

buy a little eco diesel and chuck a v8 in it

[TheLurker]

Martin Keene said:

kambites said:

inkiboo said:

kambites said:

VED doesn't change.

The DVLA seem to disagree.

They do? Where?

I know lots of people with Honda K20 engines in their Elises, and they all still fall in the same VED band as before the conversion.

Edited by kambites on Saturday 8th January 22:33

The presumption there is they have also changed the V5. For cars registered before 1st March 2001 there will only be a change in the VED if you go from below 1400cc to above 1400cc or vice verse.

What the hell happens for a car registered after 1st March 2001 where it is all done on CO2, I have know idea. You can't put the car though another c0" test, so I assume it remains the same.

The DVLA link above mentions re-applying for a tax disk if the duty rate has changed. It tells you how to change the classification, but not how to classify it.

[hungry_hog]

Also, if it's an older car the CO2 emissions would appear on the MOT so VED may change from that

[TheLurker]

Just re-read the DVLA link, mentions that you have to tell them if you change engine, and need to tell them if you change taxation class, but not how to asses the new class.

[brianthemagical]

I'm pretty sure that if the car or engine is from simple tax days then it'll be purely on engine size. MOT will be the newest of engine or car and its relevant emissions.
If it's a more modern engine or car, then one may assume they'll take you for whichever has the highest tax band.

Edit. Maybe i should have refreshed before posting.
If you want to know the answer, call/apply to VOSA/DVLA. If they think the'll get more money from you, they'll maybe give you an answer.

Edited by brianthemagical on Saturday 8th January 22:49

[TheLurker]

hungry_hog said:

Also, if it's an older car the CO2 emissions would appear on the MOT so VED may change from that

But tax is g/km (or mile, cant remember) so cant be asertained while the veichle is stationary. You couldn't use the emmisions from the car the engine was removed from either, due to differences in the two veichles giving different aerodynamics, gear ratios etc. Unless removed from same type of car.

[Deva Link]

VED only changes if you change the vehicle's taxation class. Changing the engine size doesn't affect that.

Cars can shift from one tax bracket to the next by having bigger wheels fitted - I know Ford and Mercedes point this out and other makes probably do as well. But if you fit them post-registration duty is unaffected.

[TheLurker]

Deva Link said:

VED only changes if you change the vehicle's taxation class. Changing the engine size doesn't affect that.

Cars can shift from one tax bracket to the next by having bigger wheels fitted - I know Ford and Mercedes point this out and other makes probably do as well. But if you fit them post-registration duty is unaffected.

So how do you know if you have changed taxation class with your new engine?

[ambuletz]

I think i remember fifth gear doing something like this. Cannot remember what they said about it though.

[Deva Link]

TheLurker said:

Deva Link said:

VED only changes if you change the vehicle's taxation class. Changing the engine size doesn't affect that.

Cars can shift from one tax bracket to the next by having bigger wheels fitted - I know Ford and Mercedes point this out and other makes probably do as well. But if you fit them post-registration duty is unaffected.

So how do you know if you have changed taxation class with your new engine?

You can't change it on a car that is taxed according to its emissions.

The list on the DVLA page give some things that will affect the tax on some vehicles, such as weight and number of seats, but many of the items mentioned, such as colour change, don't affect the tax.

[TheLurker]

Deva Link said:

TheLurker said:

Deva Link said:

VED only changes if you change the vehicle's taxation class. Changing the engine size doesn't affect that.

Cars can shift from one tax bracket to the next by having bigger wheels fitted - I know Ford and Mercedes point this out and other makes probably do as well. But if you fit them post-registration duty is unaffected.

So how do you know if you have changed taxation class with your new engine?

You can't change it on a car that is taxed according to its emissions.

The list on the DVLA page give some things that will affect the tax on some vehicles, such as weight and number of seats, but many of the items mentioned, such as colour change, don't affect the tax.

So you could buy a post 2001 car with a 1l engine in, dump a 3l v8 in it, and still be charged £30(or what ever the 1L engine was) a year tax?

[supersingle]

I believe this loophole is on the EU radar, it certainly is for bikes where they are planning to outlaw any modifications from the engine, through the transmission to the driven wheel.

All in the name of safety and tge environment dontcha know.

[jbi]

supersingle said:

I believe this loophole is on the EU radar, it certainly is for bikes where they are planning to outlaw any modifications from the engine, through the transmission to the driven wheel.

All in the name of safety and tge environment dontcha know.

This will kill off a huge industry if it ever makes law... more meddling with the market economy.