Originally posted by vwdan
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Evidently I've been under the misapprehension (past discussion on another contractor forum*) that claiming VAT proportionally on repairs was possible under the same rules that allow VAT on the fuel component on the 45p/mile allowance to be claimed (works out about about 2p/mile IIRC). I heard the VAT on fuel thing from an accountant as well and it's supported, I think, by the HMRC link below so not complete tosh.
That said, even if it were technically possible to reclaim the VAT proportionally on private vehicles... if this is one of those areas where "opinions vary" then I'd be siding with the cautious views held on this thread. That, and being on VAT FRS would rule it out anyway.
Anyway, since I bothered to look it up and in case it's of any use to someone :
Input tax when fuel is purchased by employees
If employees are reimbursed for road fuel they have bought for business purposes the VAT charged can be treated as input tax. This can only be done if the business can show that the employee has been reimbursed either:
for their actual expenditure; or
by way of a mileage allowance.
The business must also obtain and retain invoices for all fuel purchased by its employees. This means either full VAT invoices or less detailed invoices. Input tax can only be claimed on the cost of fuel for business use in making taxable supplies so any invoices need only cover this amount.
HMRC accepts that the amount of the invoice in many cases will not match the input tax claim in respect of business fuel in any one claim period, particularly where fuel is purchased towards the end of the period.
Clearly a claim cannot be supported by a VAT invoice that is dated after the dates covered by the claim. This means, in practice, that it may be advisable for employers to arrange for their employees who use, or may use, their cars for business purposes to retain all fuel invoices. This will ensure that, at the end of the claim period the value of business fuel is covered by an invoice.
Input tax when employees are paid a mileage allowance
Input tax is calculated by multiplying the fuel element of the mileage allowance by the VAT fraction (VAT rate divided by 100 + VAT rate). The allowance paid to employees must be based on mileage actually done. Business records must be kept to back this up. The business must retain records for each employee claiming a mileage allowance ...
If employees are reimbursed for road fuel they have bought for business purposes the VAT charged can be treated as input tax. This can only be done if the business can show that the employee has been reimbursed either:
for their actual expenditure; or
by way of a mileage allowance.
The business must also obtain and retain invoices for all fuel purchased by its employees. This means either full VAT invoices or less detailed invoices. Input tax can only be claimed on the cost of fuel for business use in making taxable supplies so any invoices need only cover this amount.
HMRC accepts that the amount of the invoice in many cases will not match the input tax claim in respect of business fuel in any one claim period, particularly where fuel is purchased towards the end of the period.
Clearly a claim cannot be supported by a VAT invoice that is dated after the dates covered by the claim. This means, in practice, that it may be advisable for employers to arrange for their employees who use, or may use, their cars for business purposes to retain all fuel invoices. This will ensure that, at the end of the claim period the value of business fuel is covered by an invoice.
Input tax when employees are paid a mileage allowance
Input tax is calculated by multiplying the fuel element of the mileage allowance by the VAT fraction (VAT rate divided by 100 + VAT rate). The allowance paid to employees must be based on mileage actually done. Business records must be kept to back this up. The business must retain records for each employee claiming a mileage allowance ...
Repairs and maintenance
If a business uses a vehicle for business purposes it can reclaim the VAT it is charged on repairs and maintenance as input tax as long as the business paid for the work. The business should do this after applying any relevant partial exemption restriction.
It does not matter if:
the vehicle is also used for private motoring; or
the business has chosen not to reclaim VAT on road fuel.
In the case of a sole proprietor or partnership VAT on repairs and maintenance cannot be reclaimed if the vehicle is solely used for private purposes.
If a business uses a vehicle for business purposes it can reclaim the VAT it is charged on repairs and maintenance as input tax as long as the business paid for the work. The business should do this after applying any relevant partial exemption restriction.
It does not matter if:
the vehicle is also used for private motoring; or
the business has chosen not to reclaim VAT on road fuel.
In the case of a sole proprietor or partnership VAT on repairs and maintenance cannot be reclaimed if the vehicle is solely used for private purposes.
* which FTOAD I rarely visit any more

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