Inflation risk
Also written Purchasing power risk
The risk that the money an investment pays out will be worth less in goods and services than expected, because prices have risen — highest in fixed-return products and most damaging to retirees.
In plain language
Inflation risk is not the risk of losing money. It is the risk of keeping every rupee and losing what those rupees buy.
The workbook is specific about where it concentrates: fixed-return instruments — bonds, deposits, debentures — where the investor is paid a fixed periodic interest and handed back the same principal at maturity. The rupee amounts are certain. Their real value is not, and it falls every year.
It is also specific about who it hurts: retired people, whose income flows tend to be fixed in absolute terms. A salary negotiates itself upward. A pension cheque of a fixed number does not.
How it works
Two features make a product vulnerable. The payout is fixed in rupees, and the term is long. A five-year deposit loses a little real value; a level annuity running 25 to 30 years loses most of it.
The workbook prescribes two defences, and neither is to abandon fixed income:
- Shorten maturities within the debt allocation, so the portfolio can reprice into the higher interest rates that usually accompany inflation.
- Hold an inflation-hedging asset class — equity or commodities — for part of the portfolio.
Its sizing rule for retirement income is the practical version of the same idea: size the annuity so that essential, mandatory expenses stay covered even after long-run real erosion, and fund discretionary expenses from growth assets.
The formula
Real value of a fixed payment after n years = Payment ÷ (1 + inflation)^n
A 3 percent simple step-up raises the nominal payment arithmetically, not geometrically:
Payment in year n = Initial payment × (1 + 0.03 × n)
That is why it cannot keep pace with inflation compounding at 5 to 6 percent — the workbook calls it partial protection, and the arithmetic says why.
A worked example
A retiree annuitises part of her NPS corpus and buys a level annuity of Rs 50,000 a month, the ordinary "annuity payable for life at uniform rate". The workbook notes that Indian inflation has historically averaged 5 to 6 percent over long horizons and that a retirement now runs 25 to 30 years. Take 6 percent.
The cheque never changes. What it buys does:
| Year of retirement | Nominal cheque | Buys, in today's rupees |
|---|---|---|
| 0 | Rs 50,000 | Rs 50,000 |
| 10 | Rs 50,000 | 50,000 ÷ (1.06)^10 = Rs 27,920 |
| 25 | Rs 50,000 | 50,000 ÷ (1.06)^25 = Rs 11,650 |
By year 25 she has lost 77 percent of her standard of living without missing a single payment.
Now buy the only stepped option the workbook lists, annuity for life increasing at the simple rate of 3 percent:
Year 25 nominal = 50,000 × (1 + 0.03 × 25) = 50,000 × 1.75 = Rs 87,500
Year 25 real = 87,500 ÷ (1.06)^25 = Rs 20,387
The step-up nearly doubles the cheque and still leaves her with 41 percent of what she started with. That is precisely what the workbook means by partial protection — and why it tells advisers to cover only essential expenses from the annuity.
Why NISM asks about it
Chapter 2, section 2.6 (Common Risks in Investments) defines inflation risk and names fixed-return instruments and retirees as the points of maximum exposure. Chapter 4, section 4.2.3 applies it to NPS annuity options — the passage on the 3 percent simple step-up is written to be examined — and Chapter 7, section 7.3 lists it as a "con" against annuities, deposits, POMIS and SCSS in turn. Expect questions asking which retirement income product carries the most inflation risk, and conceptual questions on why the adviser recommends equity exposure to a retiree at all.
Common exam traps
- Inflation risk is highest where price risk is lowest. A government-guaranteed deposit has no default risk and the most inflation risk. Candidates who rank products by "safety" get this backwards.
- A 3 percent simple step-up is not inflation indexation. Simple growth is arithmetic, inflation is geometric; the gap widens every year.
- Do not confuse it with re-investment risk. Inflation risk is the erosion of what a payment buys. Re-investment risk is being forced to redeploy a maturing deposit at a lower rate. Both hurt a retiree and the workbook lists them separately in section 2.6.
- It is a distribution-stage problem as much as an accumulation one. During accumulation, inflation raises the corpus you need; during distribution it shrinks the income you draw. The workbook treats both in section 3.5.
- "Fixed income" does not mean "fixed real income". The predictability of the rupee amount is the source of the risk, not protection against it.
- Equity in a retiree's portfolio is not a contradiction. The workbook prescribes it as an inflation hedge for the discretionary half of expenses while keeping essentials annuitised.
Where this is taught
- Series XV · Chapter 12: Fundamentals of Risk and Returnintroduced here
- Series V-D · Chapter 1: Investment Landscapeintroduced here
- Series SEBI-ICE · Chapter 5: Investment in Securities Marketintroduced here
- Series XVII · Chapter 2: Financial Markets & Investment Productsintroduced here
Related terms
- InflationA sustained general rise in the price level, which erodes what a rupee buys — and the reason a nominal return has to be deflated before it means anything.
- Liquidity riskThe risk of being unable to get out of a position at or near the quoted price — because the contract is bilateral, because the order book is thin, or because volumes dry up near expiry.
- Asset allocationThe decision on how to distribute a client's wealth across asset classes — the first decision in building a portfolio, and the one that explains most of what the portfolio then does.
- Longevity riskThe risk that a person outlives their retirement assets — living longer than the plan assumed, so the corpus runs out while income is still needed.
- Real rate of returnThe return on an investment after the effect of inflation has been removed — what the money actually buys more of, as against the nominal percentage the product advertises.
- AnnuityAn insurance contract in which a corpus paid as a lump sum or in instalments buys a periodic payment from the insurer, at a rate fixed at purchase and guaranteed for life or the contracted term.
- Real interest rateThe nominal rate adjusted for inflation — what the lender actually gains in purchasing power, and a number that turns negative whenever inflation runs above the coupon.
- Fisher effectThe proposition that, other things equal, a rise in expected inflation raises the nominal interest rate — which is why interest rate derivatives are the household sector's instrument for hedging inflation.
- Replacement Ratio MethodA way to estimate retirement income need as a fixed percentage of pre-retirement income — say 80% — in the first year of retirement, increased by inflation every year after that.
- Public Provident FundA 15-year government-guaranteed savings account for individuals, at a rate reset quarterly, where the contribution, the interest and the maturity value are all outside tax under the old regime.
- Reverse mortgageA loan that pays a senior citizen a periodic income against a pledge of the residential property they live in, repayable from the sale of that property after death or permanent departure.
- Post Office Monthly Income SchemeA five-year, government-guaranteed post office deposit paying interest every month, with a Rs 1,500 minimum, a Rs 9 lakh single or Rs 15 lakh joint maximum, and no tax benefits.
- Pradhan Mantri Vaya Vandana YojanaA closed Government of India pension scheme for those aged 60 and above, run by LIC, paying a guaranteed pension for 10 years and returning the purchase price at maturity; no new enrolment after 31 March 2023.
- Inflation Indexed BondsGovernment securities issued by the RBI whose fixed real coupon is applied to an inflation-adjusted principal, with the higher of face value and adjusted principal repaid at maturity.
- Purchasing powerWhat a sum of money can actually buy in goods and services. Inflation reduces it, so the same rupee amount buys less the further in the future it is received.
- DICGC insuranceDeposit insurance from the Deposit Insurance and Credit Guarantee Corporation covering up to Rs 5 lakh per depositor per bank, including principal and interest across all branches.
- Negative real returnA return that looks positive on the statement but sits below the inflation rate, so the money buys less than it did before — the case the workbook flags when it says a real rate can be negative.
- Market-linked return instrumentsInvestments whose return is not known in advance because it depends on the issuer's performance and on market prices — equity shares, mutual funds and listed bonds, in the workbook's own list.
- Capital PreservationAn investment objective of minimising or avoiding any erosion of the principal. Pursued by highly risk-averse investors and by anyone who needs the money in the immediate short term.