Under section 75 and section 75A of the PA95, where the value at the trigger time of a DB scheme’s assets is less than a scheme’s liabilities (both calculated on a prescribed basis), the amount equal to the difference is treated as a debt due from the employer to the scheme trustees (the employer debt).
Broadly, the trigger time is:
The employer debt calculation is a two stage process:
Once calculated the debt is due from the employer(s) to the trustees, unless arrangements are made for managing the debt.