Nominal vs Real: The Return That Actually Matters
A quoted investment rate is a nominal return — how many naira you earn. But naira are only useful for what they buy, and Nigerian inflation erodes that buying power every month. The real return is what remains after inflation, and it is the figure that determines whether your savings are actually growing. With NBS headline inflation currently at 15.91% year-on-year (auto-fetched from the CBN data API), the gap between nominal and real can be the difference between building wealth and quietly losing it.
This tool applies the Fisher equation — real = (1 + nominal) ÷ (1 + inflation) − 1 — rather than the naive subtraction shortcut, which overstates real returns because it ignores compounding.
A Worked Example: ₦1,000,000.00 in Treasury Bills for One Year
At the current 17.66% 364-day NTB discount rate, ₦1,000,000.00 grows to a nominal ₦1,176,600.00 in a year. Adjusted for 15.91% inflation via the Fisher equation, the real rate is 1.51% — equivalent to ₦1,015,097.92 in today's purchasing power. The ₦161,502.08 difference is inflation's share of your gain. (This example is gross of the 10% WHT on Treasury Bill income — the NTB calculator shows the full after-tax picture.)
The CPI Rebasing — Why Nigeria's Inflation Number Changed
In early 2026 the National Bureau of Statistics rebased Nigeria's Consumer Price Index — updating the basket of goods and the reference year. The headline rate reset to a materially lower level than the old series, not because prices fell, but because the measurement changed. Two practical consequences: never compare pre- and post-rebase inflation figures directly, and treat long-term “average inflation” assumptions with care. This tool always uses the latest published NBS figure, refreshed automatically with each monthly CPI release.
Frequently Asked Questions
What is a real return?
The real return is your investment return after subtracting the effect of inflation — the growth in what your money can actually buy. A nominal return tells you how many naira you earned; the real return tells you whether those naira buy more or less than when you started.
How is the real return calculated?
This tool uses the Fisher equation: real rate = (1 + nominal rate) ÷ (1 + inflation rate) − 1. Simply subtracting inflation from your rate overstates the result; the Fisher equation accounts for compounding correctly.
What is Nigeria’s inflation rate now?
The NBS headline year-on-year inflation rate shown in this tool is auto-fetched from the CBN data API and updates with each monthly NBS CPI release. Note that Nigeria rebased its CPI basket in early 2026, which reset the headline series to a materially lower level than the old basket — comparisons with pre-rebase figures are not like-for-like.
Which Nigerian investments beat inflation?
It changes as rates and inflation move — which is why this tool uses live figures. Compare each instrument’s after-tax yield against current headline inflation: an instrument only preserves purchasing power when its net return exceeds the inflation rate over your holding period.
Should I avoid investments that pay less than inflation?
Not automatically. An instrument yielding below inflation still loses purchasing power more slowly than idle cash, and factors like liquidity, capital preservation and currency exposure matter too. The goal is to see the real number clearly and choose deliberately.