DA Arrears Calculator
When your DA rate changes, the difference for the months already paid at the old rate is arrears. Enter your basic pay and how many months the old rate applied for.
Enter your basic pay and the number of months above to see your arrears.
This is a whole-month comparison, not prorated by day — if the rate changed partway through a payroll month, check your department's exact payroll cut-off before relying on this figure for a precise claim.
Figures last checked 20 August 2026 against official notifications. Full sources & verification notes →
Frequently asked questions
Why isn't this prorated by day?
Because payroll cut-off dates vary by department, and a day-level estimate would imply more precision than this tool can actually guarantee. If the rate changed partway through a payroll month, check your department's exact cut-off before relying on this figure for a formal claim.
What if my basic pay changed during the period too (e.g. an increment)?
This calculator assumes one constant basic pay across the whole period. If your basic pay also changed (annual increment, promotion), calculate the arrears separately for each basic-pay period and add the totals.