DA Arrear Calculator for Railway Employees

Estimate the DA difference for running or stationary staff, month by month.

Calculate gross DA arrears

Move a slider and everything updates. The whole calculation runs in your browser — nothing is sent anywhere.

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Estimated Gross DA Arrear——
Pay element (30%)—
Effective basic—
DA difference—
Difference per month—
Total DA arrear—

DA orders usually take effect from January or July but reach the salary bill later. The unpaid difference for the intervening months becomes DA arrears. Enter the basic pay that applied, both DA rates and the number of affected months.

Open the detailed arrear calculatorDA rate history

DA arrear formula

Monthly DA arrear = Effective basic × (New DA% − Old DA%) ÷ 100
Total = Sum of the monthly differences

For a period in which basic pay does not change, multiply the monthly difference by the number of months. If an annual increment or promotion falls inside the period, calculate each block separately using the basic pay actually applicable to those months.

Worked example. Running staff, basic ₹35,400, DA 58% to 60%, 3 months.
Effective basic = 35,400 + 30% = ₹46,020
Monthly difference = 46,020 × 2% = ₹920
Gross DA arrear = ₹920 × 3 = ₹2,761.

What the quick result includes

The public calculator includes only the DA percentage difference on basic or effective basic. It deliberately does not mix in HRA, transport allowance, NPS, tax or promotion fixation. Keeping those parts separate makes the DA formula easy to audit. Use the detailed in-app arrear calculator when the same order also changes HRA, TA or basic pay.

Month-by-month checklist

  1. Read the effective date in the notified DA order.
  2. List the basic pay shown in each affected salary month.
  3. Mark any increment, promotion, leave-without-pay or retirement change.
  4. Calculate each group of months at its own basic pay.
  5. Compare the gross estimate with the arrear statement before relying on it.
Do not use current basic for every month when an increment or promotion occurred inside the period. That is the most common reason a hand calculation does not match the pay bill.

Common questions

How are DA arrears calculated?

For each month, multiply the basic or effective basic that applied in that month by the difference between the new and old DA percentages. Then add the monthly differences. If basic pay remained unchanged, the same monthly difference can simply be multiplied by the number of arrear months.

How is DA arrear different for running staff?

For this RailStaff estimate, running staff use the effective basic that includes the 30% pay element before the DA percentage difference is applied. Stationary staff use basic pay without that factor. Select the correct category and confirm the treatment against your pay slip and applicable order.

What is the current DA revision used as the default?

The calculator currently starts with the configured revision from 58% to 60%. The new rate is effective 1 January 2026. Both percentage fields remain editable so an older or future notified revision can be checked without changing the formula.

What if my basic pay increased during the arrear period?

Split the period at the increment or promotion date. Calculate the earlier months on the old basic pay and the later months on the new basic pay, then add both results. Multiplying every month by the latest basic pay would overstate the arrear.

Does this calculator deduct NPS or income tax?

No. The dedicated public calculator shows the gross DA difference so the formula stays transparent. The detailed arrear tool inside RailStaff can estimate additional salary components and an NPS deduction. Income tax and section 89 relief depend on the year and individual facts and should be checked separately.

How many months should I enter?

Count the salary months for which the old DA rate was paid after the new rate became effective. Do not automatically count from the date of the announcement. The effective date in the government order and the month in which the revised rate entered your salary determine the arrear period.

Official sources

Rules and rates on this page come from the departments below. Where a figure matters to you, check it against the current order — RailStaff is not the authority for it.

Related calculators

Current DA RateCurrent percentage, effective date and HRA slab DA Rate HistoryEvery revision since the 7th CPC began Income Tax ComparisonCompare old and new regimes after arrears

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