overnight rate
Overnight Rate is the interest rate banks charge each other for lending money for just one night to balance their books before the next business day.
In plain English
Almost everyone who has ever run a small business or managed a large family compound knows this feeling. You wake up, check what came in and what must go out, and some days the money simply does not line up. Someone owes you, you owe someone else, and there is a gap that needs closing before the day ends.
Banks live this same drama every single day, except the numbers have many more zeros. A bank might close its books in the evening and find that it has paid out more than it took in, while another bank across town is sitting on extra cash it is not using. Rather than let one bank struggle while another hoards, they lend to each other overnight, and the interest charged on that short loan is the overnight rate.
In Nigeria, this happens in what is called the interbank market, and the rate that comes out of it, often referred to as the Nigerian Interbank Offered Rate or a similar benchmark, tends to move in the direction the Central Bank of Nigeria's Monetary Policy Rate is pointing. When the CBN raises its rate to fight inflation, borrowing overnight becomes costlier too, and that cost eventually finds its way into the interest your business loan or your cousin's car loan carries.
In the United Kingdom, the Bank of England's Bank Rate plays a similar guiding role, and the actual overnight rate banks charge each other, sometimes called SONIA, dances around it closely. A Nigerian in London sending money home might not think about this rate directly, but it calmly shapes whether the pound in their account is earning them a decent return or almost nothing.
The overnight rate rarely makes headlines the way petrol prices or exchange rates do, yet it sits underneath almost every loan, savings account and mortgage rate you will ever see. It is the calm plumbing of the financial system, unseen but always working.
A bank in Lagos closes its books ₦2 billion short after heavy withdrawals. Another bank has ₦3 billion sitting idle. The short bank borrows ₦2 billion overnight at, say, 18 percent annualised, pays it back the next morning with a small interest charge for that one night, and both banks close their books balanced.
Questions people ask
Who actually sets the overnight rate in Nigeria?
No single person sets it directly. It emerges from banks trading with each other in the interbank market, but it stays close to the Central Bank of Nigeria's Monetary Policy Rate because that rate signals where the CBN wants borrowing costs to sit.
Does the overnight rate affect ordinary savers and borrowers?
Yes, indirectly. When the overnight rate rises, banks generally raise the interest they charge on loans and sometimes what they pay on savings, since their own cost of borrowing has gone up.
Is the overnight rate the same as the bank rate?
They are related but not identical. The bank rate, set by the central bank, is a policy tool meant to guide borrowing costs, while the overnight rate is the actual rate banks charge each other day to day, which usually moves in line with the bank rate.
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