How is the Pensions Protection Fund stress test calculated?

For defined benefit schemes entering the Pension Protection Fund, we use an approximation to model the potential decrease in benefits. 

This approximation is to apply a proportion of 90% to the largest future starting final salary / Defined Benefit annual pension that is entered.  We assume that only one person will enter the Pension Protection Fund, even in a joint life case.

This approach applies to both pre and post retirement defined benefit pensions starting in the future, and doesn't include the upper cap.