How India's DA Is Calculated, From CPI Data to Your Salary

Once the rate is computed, it goes through approval and notification. The revised DA is generally applicable from the notified effective date, which can create a gap between when the change takes effect and when the government formally announces it. If the revision is made effective retrospectively, employees may receive arrears covering the intervening period. For example, a notification released on 1 September 2026 could be effective from 1 July 2026, meaning relief starts from that earlier date.

For employees, the key distinction is between a reported DA hike based on inflation data and actual implementation. The journey from CPI data to a higher salary involves several stages: collecting CPI-IW data, calculating the rate, government approval, issuing an official notification, and final payroll implementation. Understanding this chain helps separate expectations around a hike from the point at which the revised allowance becomes payable.