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The Central Bank of Nigeria raised interest rates on its one-year Treasury bill to 17.59% at Wednesday’s auction.
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Investors flooded the bank with ₦4.4 trillion in total bids even though only ₦700 billion was originally put up for sale.
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The decision surprised financial markets that expected massive demand to drive borrowing costs down for the government.
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Experts suggest high yields will stay around longer as the central bank works to mop up excess cash floating in the banking system.
August 13, (THEWILL) — In a surprise move that caught many financial watchers off guard, the Central Bank of Nigeria has pushed up borrowing costs on its flagship one-year Treasury bill.
At the debt auction held on Wednesday, August 12, 2026, the apex bank bumped the rate on 364-day bills up to 17.59%. The increase caught investors by surprise because demand for government paper was overwhelming.
Investors offered a staggering ₦4.4 trillion across three different investment periods. The central bank had originally asked to borrow just ₦700 billion.
Usually, when so much money is chasing so few bills, the central bank lowers interest rates because it does not need to pay extra to attract investors. However, monetary authorities chose to do the exact opposite.
READ ALSO: DMO Raises N709.62bn As 364-day Treasury Bill Yield Climbs To 17.5%
Why the Surprising Rate Increase Happened
The decision represents a sharp turn from late July, when the central bank cut the one-year rate despite high demand.
This time, orders for the 364-day bill alone reached ₦4.19 trillion. That was more than eight times the ₦500 billion offered to the public.
Instead of taking advantage of the high demand to lower costs, the bank accepted ₦1.26 trillion in bids and raised the payout rate by 24 basis points from 17.35%.
The shorter options told a different story. The 91-day bill attracted ₦162.21 billion in demand and stayed flat at 16.30%. The 182-day bill struggled, pulling in only ₦63.97 billion out of the ₦100 billion requested, with its rate holding steady at 16.50%.
READ ALSO: CBN Says Naira FX Gap Narrows Below 2 Percent as Reforms Gain Traction
Mopping Up Excess Cash in the Economy
The rate hike comes on the heels of heavy cash injections flowing through Nigerian banks.
Around ₦2.48 trillion in old open market repayments settled on August 11, forming part of a massive ₦5.21 trillion cash injection over a single week.
When commercial banks sit on that much surplus cash, rates typically fall. Analysts note that the central bank is using high auction rates as a sponge to mop up extra money floating around, rather than simply trying to raise cheap funds for the government.
For everyday investors and money managers, the high payout means attractive returns on government-backed bills will linger longer than expected.
It also complicates predictions that the central bank would begin cutting interest rates at its upcoming September policy meeting.
Joy Onuorah is a business journalist and brand communications specialist covering financial markets, artificial intelligence, digital economy, and the ideas reshaping business across Africa and the global market. Beyond her reporting for TheWill, Joy uses brand strategy, storytelling, copywriting, and high-value SEO to help brands build lasting market authority.
