DA Arrears Calculator
Updated November 2026 · Free · No sign-up
Calculate your DA arrears — the lump sum owed when a DA hike is announced months after its effective date: per-month difference × arrear months, with the NPS deduction and tax notes payroll never explains.
Quick answer: DA arrears = basic × (new DA% − old DA%) × arrear months. A 3-point hike (55%→58%) on ₹35,400 basic announced 3 months late = ₹1,062 × 3 = ₹3,186 lump sum (minus the NPS employee share on the arrears).
Why DA Arrears Exist
DA hikes take effect 1 January and 1 July, but the AICPIN data and cabinet approval take 2-3 months — so the raise is announced in March (or September-October) and the gap months arrive as one arrear payment. The formula is pure multiplication; the surprises are the deductions.
Worked Examples
Example 1 — standard cycle. Basic ₹35,400, 55%→58%, 3 arrear months: ₹1,062 × 3 = ₹3,186 gross arrears. NPS employees see 10% (₹319) diverted to their pension corpus — matched by the government's 14% — so cash in hand ≈ ₹2,867 before tax.
Example 2 — pensioner DR arrears. Pension ₹24,000, same hike: ₹720 × 3 = ₹2,160, no NPS deduction, taxable as pension income.
Example 3 — the TDS bump. Arrears land in one month's payroll, so that month's TDS jumps — payroll annualizes correctly over the year, and small arrears rarely justify Section 89(1) relief, but multi-year arrears (pay-commission or promotion-related) usually do.
What Gets Deducted From Arrears
| Deduction | Applies? |
|---|---|
| NPS/UPS employee 10% | Yes — on basic+DA arrears for covered employees (govt adds its 14%) |
| Income tax (TDS) | Yes — arrears are salary in the receipt month |
| GPF (OPS employees) | Optional per subscription choices |
| Professional tax | Usually no change (already at slab cap) |
Arrears Beyond DA (Same Math, Bigger Numbers)
This calculator's structure — monthly difference × months — covers every government arrear: pay-commission arrears (new basic − old basic+DA, often 6-18 months — see the 8th CPC calculator), promotion/MACP arrears from a back-dated upgrade, and increment arrears after a corrected date. For private-sector late raises, the equivalent is the retro pay calculator.
Smart Uses of the Lump Sum
- Check the credit: verify basic × point-difference × months against the payslip — wrong arrear-month counts are the most common error after promotions or transfers.
- Multi-year arrears → Form 10E: file 89(1) relief BEFORE filing the return; the relief is denied without Form 10E submitted online.
- Pensioners: DR arrears follow pension revisions too — same formula on basic pension.
Frequently Asked Questions
How are DA arrears calculated?
Basic pay × (new DA% − old DA%) × number of arrear months. A 3% hike on ₹35,400 basic with 3 gap months = ₹3,186.
Why is NPS deducted from DA arrears?
Arrears are basic+DA earnings for the arrear period, so the 10% employee NPS/UPS share applies — with the government matching 14% into your corpus.
Are DA arrears taxable?
Yes — as salary in the month received. Small arrears just raise that month's TDS; multi-year arrears qualify for Section 89(1) relief via Form 10E.
How many months of DA arrears do I get?
Usually 2-3 — the gap between the effective date (1 Jan / 1 Jul) and the announcement month. Pay-commission arrears can run much longer.
Do pensioners get DA arrears?
Yes — Dearness Relief arrears on basic pension for the same gap months, without NPS deductions.
My arrear amount looks wrong — how do I verify?
Recompute basic × point difference × months and match the payslip line; mismatches usually trace to a mid-period increment, promotion, or wrong month count.
✓ Formula verified • Last updated: November 3, 2026