How an 8th CPC salary estimate is actually built
The 7th CPC did not invent its numbers; it followed a sequence that every commission since the second has broadly repeated. Applying that same sequence to the 7th to 8th transition is what produces a defensible estimate rather than a guess.
Step 1 — freeze the picture at the reference date
The 7th CPC worked from 1 January 2016, when DA on 6th CPC pay had reached 125 per cent. The Cabinet-approved Terms of Reference point the 8th CPC at 1 January 2026, when DA on 7th CPC pay was 60 per cent. Later DA instalments do not change this anchor, because the revision applies retrospectively from the reference date even though the money arrives much later.
Step 2 — merge DA into basic pay
Basic plus DA at the reference date becomes the new base. That gave a merge multiplier of 2.25 in the 6th to 8th transition and gives 1.60 this time. Nobody is better off at this step; it is pure relabelling of money already in hand.
Step 3 — add the real hike
The 7th CPC added about 14.29 per cent over the merged base, which is how 2.25 became a headline 2.57. The size of this top-up for the 8th CPC is the only genuinely open question, and it is a negotiated outcome between staff federations pushing for 30 to 80 per cent and a Finance Ministry watching the fiscal deficit.
Step 4 — reset DA and reprice the allowances
DA restarts at zero, HRA drops to 24/16/8 per cent with floors scaled by the fitment factor, and Transport Allowance and CGHS subscriptions move with the merge multiplier rather than the fitment factor. NPS stays at 10 per cent employee and 14 per cent employer, and CGEGIS stays at ₹120, ₹60 and ₹30.
How much confidence to place on the output
Treat every projection as directional, comfortably within a 15 per cent band either way. The method is sound and the allowance behaviour is well documented, but the final fitment factor and any structural redesign — merged pay levels, a revised insurance scheme, new allowance heads — stay unknown until the Department of Expenditure notifies the report. Useful for planning, not for signing a loan agreement.