What interest means
Interest compensates a lender for being without their money and for the risk of not getting it back.
The first question is always whether it is payable at all. Interest on a debt is generally a matter of contract. Where the agreement provides for it, it is payable on the terms stated. Where the agreement is silent, a creditor's position is much weaker and depends on the court's discretion.
The second question is how it is calculated, and this is where Nigerian disputes concentrate.
A flat rate applies the percentage to the original principal for the whole period, regardless of repayments made. A reducing balance rate applies it only to the amount still outstanding.
On the same headline percentage, flat interest costs considerably more than reducing balance. A borrower comparing two offers at the same rate, one flat and one reducing, is not comparing like with like.
How it is used
A workable interest clause states four things and most Nigerian agreements state two.
The rate. The percentage figure.
The period. Per month or per annum. A rate of three percent means very different things depending on which, and agreements are frequently ambiguous about it.
The basis. Flat or on the reducing balance, and whether it is simple or compound.
When it accrues. From drawdown, from the due date, or only on default.
Default interest is the separate question. Many agreements provide for a higher rate applying after the due date, which is legitimate provided the uplift is not so extravagant as to be penal.
For judgment debts, interest is dealt with by the rules of court, which provide for interest on the judgment sum from the date of judgment until it is satisfied, at the rate the rules set.
Pre judgment interest, covering the period before judgment, is different. It is generally available where the contract provides for it, and otherwise at the court's discretion, so a creditor should plead it specifically rather than assuming it.
Key features
- Generally a matter of contract rather than an automatic entitlement
- The rate, the period, the basis and the accrual date should all be stated
- Flat interest costs more than reducing balance at the same headline rate
- Default interest at a higher rate is permissible if not extravagant
- Judgment debts carry interest under the rules of court from the date of judgment
- Pre judgment interest should be pleaded specifically
How this works in Nigeria
The single most common Nigerian lending dispute is not about whether the money was lent. It is about how much interest had accrued.
An agreement stating five percent, with no indication of whether that is monthly or annually, flat or reducing, is an argument waiting to happen, and informal lending agreements say exactly that constantly.
One sentence solves it: two percent per month on the reducing balance, calculated monthly, accruing from the drawdown date. Anybody can read that and arrive at the same number.
On default interest, an uplift is normal and enforceable within limits. A rate set so far above the ordinary rate that it operates to punish rather than to compensate risks being treated as penal, which puts the lender back to proving actual loss.
For consumer and small business borrowing, the effective cost matters more than the headline. Fees charged upfront, deducted from the amount advanced, raise the effective rate considerably, and a borrower comparing offers should calculate what they actually receive against what they actually repay.
Courts award post judgment interest routinely under the rules. Pre judgment interest is discretionary where the contract is silent, so lenders should draft for it rather than argue for it.
Flat rate vs reducing balance vs compound interest
Three ways of calculating the same headline percentage, producing very different totals.
Flat rate applies the percentage to the original principal for the entire term, regardless of what you have repaid. Borrow a million naira at two percent monthly flat over twelve months and you pay interest on the full million every month, even in month eleven when you owe very little.
Reducing balance applies the percentage only to what remains outstanding. As you repay, the interest falls. On the same nominal rate this costs materially less.
Compound interest charges interest on accrued interest as well as on principal. Over a long period the difference against simple interest is substantial, and it should be stated expressly because it is not assumed.
When comparing loans, ask which of the three applies. A lender quoting a flat rate and one quoting reducing balance at the same percentage are offering different products at different prices.
Limits and risks
Without a contractual provision, a creditor's entitlement to interest is uncertain and depends on the court.
Extravagant default rates risk being treated as penal, which defeats the clause entirely rather than reducing it.
Interest also does not solve recovery. Accruing interest against a debtor with no money simply increases a figure nobody will pay.
And the limitation clock runs on the underlying debt. A creditor watching interest accumulate for years without enforcing may find the claim becoming statute barred while the arithmetic grew.
Worth knowing
Write the rate, the period and the basis in a single sentence: two percent per month on the reducing balance. Nigerian lending disputes are overwhelmingly about how much interest had accrued rather than about whether money was lent, and that one sentence removes the argument.
Questions people ask
Can I charge interest on money I lent?
Where the agreement provides for it, yes, on the terms stated. Where the agreement is silent, the position is much weaker and depends on the court's discretion, so it should always be written down.
What is the difference between flat and reducing balance interest?
Flat applies the percentage to the original principal for the whole term regardless of repayments. Reducing balance applies it only to what is still outstanding. At the same headline rate, flat costs materially more.
Do Nigerian courts award interest on judgments?
Yes. The rules of court provide for interest on the judgment sum from the date of judgment until it is satisfied, at the rate the rules set.
Can I claim interest for the period before judgment?
Where the contract provides for it, yes. Otherwise it is at the court's discretion, so it should be pleaded specifically rather than assumed.
Is a high default interest rate enforceable?
An uplift on default is normal and enforceable within limits. A rate set so far above the ordinary rate that it punishes rather than compensates risks being treated as penal, which defeats the clause.
How should an interest clause be worded?
State the rate, the period, the basis and when it accrues in one sentence, for example two percent per month on the reducing balance, calculated monthly, accruing from the drawdown date.