Calculate pension or DR arrears
Enter the old and revised monthly payable amounts.
What this calculator does
It calculates the difference between an old and revised monthly amount across a chosen period. This is useful for checking a rough pension, family-pension or DR arrears figure after you already know the correct old and revised monthly amounts.
Daily calculation is only indicative
For extra days, this calculator uses a simple 30-day month for estimation. Actual pension/payment systems may apply the governing payment rule for broken periods, so use the final sanction/payment statement as controlling.
Do not use it to invent a revised pension
First determine the correct revised basic pension/DR from the relevant PPO, OROP table or Government order. Then use this calculator to check the arithmetic of the arrear period.
Official sources
Source review: 10 September 2026.