Work out the value
You can work out the value of loans using HMRC’s PAYE Online or commercial payroll software.
You can also work out the value manually on P11D working sheet 4.
Salary sacrifice arrangements
If the cost of the loan is less than the amount of salary given up, report the salary amount instead.
These rules don’t apply to arrangements made before 6 April 2017 - check when the rules will change.