Why interest on a loan is an expense but repaying it is not

A business that borrows money usually pays it back in instalments, and each instalment is one sum leaving the bank. Yet accounting does not treat it as one thing.

It splits every payment to the lender into two parts that behave in opposite ways. The interest is a real expense that reduces the profit for the year.

The repayment of the amount borrowed is not an expense and never reaches the income statement. The rule can seem arbitrary at first, but it rests on a key idea in the subject: the line between capital and revenue.

Two payments, one lender, two meanings

Suppose a business borrows RM40,000 and, at the end of a period, pays the bank RM3,000. Of this, RM2,500 reduces what it owes and RM500 is interest. It is one cheque to one lender on one date, but the accounts pull the RM3,000 apart. The RM500 of interest goes to the income statement and lowers profit.

The RM2,500 does not touch profit. It shrinks the loan on the statement of financial position. Why are two halves of one payment treated differently when both leave the business as cash?

What makes something an expense

Not every payment is an expense. An expense is a cost the business has used up while earning its revenue, such as rent, wages or electricity.

Cash leaving the bank is not the test. Many payments buy something lasting or hand back something already owed. Neither is a cost of trading.

So ask: has the business used up something of value, or just moved money around? Interest and repayment give opposite answers.

Interest is the price of using the money

Interest is what the business pays for using someone else’s money over time. It is like rent on the borrowed cash. A business that rents premises pays for a building it does not own.

A business that borrows pays for money it does not own. The charge is a real running cost, and it is used up steadily as time passes. The longer the money is held, the more its use costs.

Interest buys nothing lasting and leaves nothing behind. It is used up as it arises, and value used up in earning revenue is the definition of an expense. So interest reduces profit for the period, beside every other cost of trading.

Repaying the principal returns what was never yours

Repaying the amount borrowed is a different kind of event. When the business borrowed the RM40,000, it did not earn that money.

It took on an obligation to give it back. The cash was always owed, and repaying it honours that obligation.

Nothing is used up. The business is not paying for the use of anything. It is handing back what it was lent.

Returning what you owe is not a cost. It settles a debt. That is why the RM2,500 never reaches the income statement. Treating it as an expense would pretend a cost had arisen when only a liability shrank.

The capital-and-revenue line through a loan

This split is the capital-versus-revenue distinction in another form. The loan is a capital item.

It is part of the long-term financing of the business: money raised that must one day be returned. Taking the loan on and paying it down stay within the statement of financial position.

The interest is a revenue item: an ordinary, recurring cost of trading that belongs to the period in which the money was used. The same instinct that separates buying a machine (capital) from paying to run it (revenue) separates repaying a loan from paying interest on it.

Two statements doing two jobs

The income statement measures performance: how much the business earned and what earning it cost. Only real costs of trading belong there. The statement of financial position records what the business owns and owes at one moment, including the loan.

Interest feeds the first. Repayment belongs to the second: it lowers cash and lowers the loan by the same amount, leaving profit untouched. Sending each part of the payment to the statement whose question it answers keeps both honest.

The matching concept confirms it

The matching concept says the cost of earning a period’s revenue should be set against that revenue in the same period.

The business enjoys the use of borrowed money period by period, so the interest that pays for it is charged period by period. Interest owing at the year end is still an expense of the year, even if not yet paid.

Repaying the principal is not the cost of earning anything. It attaches to no period’s revenue, so there is nothing for matching to spread.

What if the two were swapped?

Suppose a business treated the RM2,500 repayment as an expense. Profit would be understated, and the income statement would absorb money that was never a cost. The accounts would report a poorer year than the business really had. If it ignored the RM500 of interest, profit would be overstated, because a real cost of borrowing would disappear from the record.

Neither is honest. Paying for the use of money is a burden. Returning the sum lent leaves the business neither richer nor poorer, only holding less cash and owing less by the same amount.

Does your child put loan interest and repayments in the same place? One of our teachers can split a single loan payment into its capital and revenue parts. Book a trial class