When you leave your job, you may be entitled to a payment for any unused holiday allowance.
Calculate your leave entitlement, based on how much of your current leave year has passed (your company may set a standard leave year, which you can find out in your staff handbook, or you may have an individual leave year, which will run from the date you originally started work with your company). You are entitled to one twelfth of your annual holiday entitlement for every month you have worked of the current leave year.
If you have unused entitlement when you leave, your employer should pay you your equivalent daily pay rate for these days. Be aware though, that if you have already taken more than your entitlement for the year, you may need to pay back your employer for the paid holiday you have taken, but not yet earned. (Your employer can only do this if there is a written term in your employment contract allowing deductions to be made from your pay).