The Rate Cut and Your Savings: What 23% Does to Your T-Bills, Your Fund and Your Account

If a Treasury bill you bought months ago is about to mature, the question sitting in front of you is simple: roll it over, or move the money? The forums are full of it this fortnight, and with reason. On 22 September 2026 the Central Bank of Nigeria cut its Monetary Policy Rate from 26.5% to 23%, a 350 basis point move. The one-year bill that cleared at 16.62% on 9 September cleared at 15.89% on 23 September, the first auction after the cut. What that does to your money depends on which door it sits behind.

A bill you already hold does not reprice

A Treasury bill's rate is locked the day you buy. Pay about 84 naira, collect 100 at maturity: hold it and that is your return, whatever the Central Bank does in between. The cut only changes the price of the next bill. Roll a maturing bill today and you accept the new stop rate, not the old one. The one-year rate has now fallen at three consecutive auctions, and investors still bid 4.09 trillion naira for the 400 billion on offer at the last one.

Each instrument reprices on its own clock. The only honest comparison is yield minus inflation, not yield minus zero.

Your fund drifts down, slowly

A money market fund never locked anything. Its quoted yield is a trailing average of a rolling portfolio, so the cut reaches you only as the fund's older, higher-rate paper matures and is replaced at lower rates. Expect the number on the app to sag gradually, not gap down overnight. Funds still held 6.49 trillion naira as of 11 September 2026, with the top performers above 21% year to date, figures that include the high-rate months now behind us.

Your savings account moves by formula

The savings account is tied to the policy rate by rule. Since August 2022, CBN regulation has set the minimum interest on a naira savings deposit at 30% of the MPR. At 26.5% that floor was 7.95%. At 23% it is 6.9%, and banks including Stanbic IBTC have already issued repricing notices effective 22 September. That is before the fine print: most banks forfeit the month's interest entirely if you make more than four withdrawals.

The number that decides whether any of it counts

Strip every rate against inflation and the picture narrows. Headline inflation was 15.39% in August 2026, down from 23.14% a year earlier, and the September figure is due in mid-October. At August's print, the new bill sits further ahead of prices than its quoted rate suggests. The 15.89% stop rate is a discount rate, measured against the face value collected at maturity; on the cash actually handed over, the return is about 18.9%, and about 17% once the 10% withholding is taken out of the discount, roughly a point and a half ahead of prices. A fund yielding around 16% is roughly level, before its own fees and withholding. The 6.9% savings account falls behind by about eight and a half points a year. Parking money is getting less rewarding precisely because the fight against inflation is, for now, working.

One quiet winner: existing bondholders

Falling rates have a flip side. When market yields drop, the fixed coupon on an older bond becomes more valuable, so its price rises. That played out in the last week of September: benchmark FGN bond yields fell across the curve, handing paper gains to anyone already holding, and FGN bonds remain exempt from the 10% withholding tax that bills and funds pay. Long-dated holders gain most from this kind of repricing; short-bill holders barely notice it.

If you are reading from abroad

The same mechanics apply in pounds or dollars, with one extra variable. Your real return is the naira yield minus Nigerian inflation, then adjusted for wherever the exchange rate lands when you convert back. The cut narrows the first term; the currency decides the rest.

None of this tells you what to do with a maturing bill, because it cannot: that depends on what the money is for and when you need it. What the cut does tell you is that the season of locking 17% or 18% from the government is closing, that each instrument reprices on its own clock, and that the only honest comparison is yield minus inflation, not yield minus zero.