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DA Calculation Formula
DA = Basic Pay × (DA% / 100)
For example, if your basic pay is ₹56,100 and the current DA rate is 60%, then your DA = ₹56,100 × 0.60 = ₹33,660 per month. This is the same formula used by all Central Government departments.
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How DA Percentage is Determined
DA% = [(Avg AICPI-IW – 115.76) / 115.76] × 100
The DA percentage is calculated using the 12-month average of the All India Consumer Price Index for Industrial Workers (AICPI-IW) with base year 2016=100. The base index value of 115.76 was set by the 7th Pay Commission.
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DA Revision Schedule
DA is revised twice a year by the Government of India, as per the recommendations of the 7th Central Pay Commission:
- January 1: Based on AICPI-IW average of Jul–Dec of previous year
- July 1: Based on AICPI-IW average of Jan–Jun of current year
The Union Cabinet approves each revision, typically announced a few months after the effective date.
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Impact on Other Allowances
When DA crosses 50% of basic pay (which occurred in January 2024), HRA rates are revised upward as per 7th CPC rules:
- X Cities (Metro): 27% of Basic Pay
- Y Cities: 18% of Basic Pay
- Z Cities: 9% of Basic Pay
DA also affects Transport Allowance and other allowances linked to basic pay.