CBN bills hit N5.6 trillion, drive 74% of September money-supply growth

Central bank bills surged to N5.6 trillion in September 2026 and accounted for 74 per cent of the increase in Nigeria’s money supply, according to Nairametrics, a development that shows how heavily the monetary authority is relying on short-term securities to manage liquidity. The figure is a measure of both the scale of intervention and the difficulty of controlling money growth in a complex financial system.

Money supply expands when banks create deposits through lending and when the central bank injects liquidity. CBN bills absorb some of that liquidity by giving banks a place to park cash. When the stock of bills rises, it usually means the central bank is trying to offset an increase in reserves, government spending or foreign-exchange operations.

The 74 per cent share is striking. It suggests that most of the growth in money supply in September was matched by an increase in central bank paper rather than by a broad expansion of credit to the private sector. That has important implications for inflation, lending and the effectiveness of monetary policy.

How CBN bills work

CBN bills are short-term obligations issued by the central bank to absorb liquidity. Banks buy them with excess reserves, and the central bank pays interest. When the bills mature, the liquidity returns to the banking system unless the central bank rolls them over.

The instrument is useful because it can be adjusted quickly. Unlike a change in the policy rate, which affects the entire yield curve, CBN bill sales can target specific amounts of liquidity at specific maturities. That flexibility is valuable in a market where cash flows from government spending and oil revenues can be lumpy.

But the reliance on bills has costs. The central bank must pay interest on the paper, and those costs ultimately affect its balance sheet and remittances to the government. If the stock of bills grows too large, the central bank can become a major borrower in its own currency, competing with the private sector for funds.

What the September data shows

The N5.6 trillion increase in CBN bills indicates that the central bank was active in mopping up liquidity during the month. It also suggests that the banking system had enough cash to absorb the sales without a sharp rise in interbank rates.

The 74 per cent contribution to money-supply growth is a reminder that monetary aggregates can be misleading. A rise in money supply does not necessarily mean that households and businesses have more spending power. If the increase is matched by central bank absorption, the net effect on demand may be smaller.

Still, the composition matters. If money growth is driven by central bank operations rather than private credit, the transmission from monetary policy to the real economy may be weaker. Banks are holding government paper instead of lending to businesses, which can slow investment and employment growth.

The inflation question

Inflation remains the central bank’s main concern. Nigeria’s consumer price index has been volatile, influenced by food prices, fuel costs and the exchange rate. Controlling money supply is one way to restrain demand-side pressure, but it cannot address supply shocks.

If the central bank absorbs too much liquidity, it can push up interest rates and slow credit. If it absorbs too little, the naira may weaken and inflation may accelerate. The N5.6 trillion stock of bills suggests that policymakers are leaning toward restraint.

The challenge is to avoid over-tightening. Small businesses and manufacturers already face high borrowing costs and limited access to credit. A monetary policy that relies too heavily on bill sales can deepen those problems without solving the underlying supply constraints.

What investors should watch

The growth of CBN bills affects the entire yield curve. When the central bank offers attractive rates on short-term paper, banks have less incentive to lend at longer tenors. That can flatten the curve and reduce the profitability of maturity transformation.

For bond investors, a large stock of CBN bills can signal that the central bank is committed to tight liquidity, which may support the naira and anchor inflation expectations. But it can also crowd out government bonds and corporate debt, pushing yields higher across the market.

The maturity profile is another consideration. If a large share of the bills matures in a short period, the central bank will face a rollover challenge. A failed rollover could inject liquidity unexpectedly and undermine the tightening stance.

The policy dilemma

Nigeria’s monetary authority is managing multiple objectives with limited tools. It wants to control inflation, stabilise the exchange rate, support growth and maintain financial stability. CBN bills are a blunt instrument that can help with some of these goals but not all of them.

A more durable solution would require fiscal discipline, structural reforms and a deeper financial market. Without those, the central bank will continue to rely on short-term securities to manage liquidity, and the stock of bills will keep growing.

The September data is therefore a snapshot of a policy in transition. It shows that the central bank is willing to act, but it also shows how much of the burden is falling on one instrument. The longer that persists, the greater the risk of unintended consequences for credit, growth and the central bank’s own balance sheet.