India has an official inflation number. It is 4%

Most people plan with a number they picked up somewhere — six per cent, sometimes ten, sometimes whatever last year felt like. There is an official number, it is written into law, and it is worth knowing before you choose a figure to plan against.

What the law actually says

Under Section 45ZA of the Reserve Bank of India Act, 1934, the Central Government — in consultation with the RBI — determines the inflation target in terms of the Consumer Price Index, once in five years, and notifies it in the Official Gazette.

On 5 August 2016 it notified 4% CPI inflation as the target, with an upper tolerance limit of 6% and a lower tolerance limit of 2%. It retained the same target and the same band at the first review in March 2021, and again at the second review in March 2026, for the five years running to March 2031.

Two details in that paragraph do a lot of work.

The first is that it is a target, not a promise. Nobody has undertaken that prices will rise 4% a year. A target is a commitment to aim, and the aiming is done by a six-member Monetary Policy Committee constituted under Section 45ZB, which sets the policy rate.

The second is that "failure" has a written definition. The Government has notified the factors that constitute failure to achieve the target: average inflation above the upper tolerance level for any three consecutive quarters, or below the lower tolerance level for any three consecutive quarters. So the band is not decoration. Inflation can sit at 5.9% for a year without anything having formally gone wrong.

Why the band matters more than the target

If you plan against 4% and inflation runs at the top of its permitted band, you have quietly overestimated what your money will buy — and the overestimate compounds.

Take a deposit paying 7%. The real return is not seven minus inflation, because returns and prices both compound; you divide.

Against the 4% target, that deposit earns $1.07 \div 1.04 - 1$ = 2.88% in real terms. Against the 6% upper tolerance, it earns $1.07 \div 1.06 - 1$ = 0.94%. Against the 2% lower tolerance, 4.90%.

Same deposit, same rate, three answers — and the spread between them is wider than the real return itself at the top of the band. That is the whole reason to know the band exists.

Over twenty years the gap stops being abstract. A rupee's purchasing power multiplies by $1.0288^{20}$ = 1.77 at the target, and by $1.0094^{20}$ = 1.21 at the upper tolerance. Planning at the target and living at the ceiling leaves you about a third short of what you expected to be able to buy, having earned exactly the return you predicted.

You can put your own figures into the inflation calculator, and the arithmetic behind the division is worked through in real returns — why you divide, not subtract.

Three honest limits

• The index is an average basket. CPI measures a defined basket with defined weights. Your own spending is not that basket, so your personal inflation rate is not the published one — it is simply the best measured number available.
• Tax comes first. Interest is income, and the real return is what is left after tax, then divided by inflation. The order matters, and nothing on this site is tax advice.
• A target says nothing about any particular year. The framework is about where inflation is steered over time. It is not a forecast, and neither is this page.

What the target is genuinely good for is a planning default. If you need a number for the inflation box in a calculator and have no better information, the notified target and its upper tolerance give you a defensible pair to test against — one optimistic, one cautious — instead of a figure you half-remember. Run both. If a plan only works at 4%, you have learned something useful about the plan.

A move in world prices arrives smaller than the headline by the time it reaches what you pay, because each step on the way is only a share of the next.