A worked example: ₹56,100 basic pay at 55% DA
A basic pay of ₹56,100 at the current 55% DA rate gives a DA amount of ₹30,855, bringing basic pay plus DA to ₹86,955.
The formula: DA = basic pay × DA rate
A single multiplication — no slabs, no thresholds, just basic pay times the officially notified percentage. The same 55% rate applies to every central government employee on the 7th CPC structure, so a lower basic pay simply produces a proportionally smaller DA amount: ₹35,400 basic pay at the same 55% rate gives ₹19,470 in DA.
Why the rate changes twice a year
DA is revised every January and July based on the 12-month average movement of the All-India Consumer Price Index for Industrial Workers (AICPIN) — it exists specifically to help salaries keep pace with inflation between the less-frequent pay commission revisions that reset basic pay itself.
Why DA is fully taxable, unlike some allowances
DA is treated as fully taxable salary income, with no partial exemption the way House Rent Allowance can have for someone paying rent — it's added to gross salary in full when computing tax liability.
What this DA figure feeds into next
DA doesn't just sit on its own — the current DA rate also determines which House Rent Allowance slab applies, since HRA rates step up specifically when DA crosses 25% and 50% thresholds.