Increasing your voluntary excess will reduce your insurance premium and gain cheaper car insurance but you be be expected to pay both the compulsory and voluntary excess amount in the event of a claim deemed to be your fault.

To decide how much voluntary excess is best for you decide how much you can afford then deduct the compulsory excess to leave you an amount that will be your voluntary excess.

Example;

1. You decide that you can afford to pay £300 in the event of an accident where you are at fault.
2. The insurance policy contains £100 compulsory excess
3. You can decide to offer to pay £200 voluntary excess
4. Find out how much cheaper your insurance will be, perhaps get 3 quotes with voluntary excess of £50, 100 and £200
5. Work out what's best, how much cheaper will your insurance be with different voluntary excess.

It is important to note that you will be expected to pay excess on a theft or vandalism claim and some cheap insurance policies may require an excess to be paid even if the accident was not you fault