Change your vehicle's tax class
Work out the new tax rate
You need to work out if you’ll need to pay more tax because of the change.
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Find out the new rate of vehicle tax.
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Work out the difference between the old and new rates of your vehicle tax. For example, if the old rate is £100 and the new rate is £130, the difference is £30.
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Divide the difference by the number of months you pay your tax over. For example, £30 divided by 12 months is £2.50.
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Multiply this by the number of months remaining on the tax. For example, £2.50 multiplied by 4 months is £10.
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Pay the extra vehicle tax. In this example you would need to pay £10 extra tax.
If the tax rate increases
You have to pay the increased rate from the first day of the month you change the tax rate in.
###Example
If you change the tax class on 25 March, you’ll have to pay the increased rate from 1 March.
If the tax rate decreases
You pay the decreased rate from the first day of the next month.
###Example
If you change the tax class on 25 March, you’ll pay the decreased rate from 1 April.