How a business line of credit actually works

Most business owners understand a loan. You borrow a sum, you repay it on a schedule, it ends. A line of credit works differently enough that the differences are worth spelling out, because the misunderstandings cost real money.

The mechanics

A lender approves a limit. You draw against it when you need money, and the drawn amount accrues interest. You repay, and the repaid amount becomes available again. You can do this repeatedly for as long as the facility is open, which is why it is called revolving.

The part people miss: an undrawn line costs little or nothing beyond any maintenance fee. A $100,000 facility sitting at zero is not a $100,000 debt. It is an option you hold, and the option is the point.

What it is for

Timing gaps that recur. Not emergencies, not expansion — timing. The classic shapes in Idaho:

• A Nampa processor paying for inputs through pack season and banking receivables afterwards.
• A Moscow restaurant carrying rent and key staff through the summer when the students are gone.
• A Coeur d’Alene outfitter buying inventory in spring for a season that starts in June.
• A contractor anywhere in the state covering payroll between progress draws.

In every case the money comes back. That is what distinguishes a working capital need from a capital investment, and it is the test for whether a line is the right instrument.

What it is not for

Buying something that will not repay itself inside the cycle. A piece of machinery, a build-out, an acquisition — those are multi-year investments and they belong on multi-year debt. Funding them from a revolving line means the line never gets back to zero, and a line that never returns to zero has quietly become a term loan with worse terms and no end date.

What the lender is watching

Utilisation and behaviour, not just repayment. A line that sits permanently at its limit reads as distress even if every payment is made on time. A line that moves — drawn in your heavy months, cleared in your strong ones — reads as a business managing itself well, and it makes the next increase easier to get.

Most facilities are also reviewed periodically rather than being permanent. A limit is not a right; it can be reduced or withdrawn if the business deteriorates. That is worth knowing before you build a plan that depends on the line being there forever.

Secured or unsecured

Smaller lines are often unsecured, resting on your cash flow and personal guarantee. Larger ones are typically secured against receivables, inventory or a blanket business lien. Secured facilities are usually larger and cheaper, at the cost of tying up collateral you might want for something else later. Neither is better in the abstract.

The timing rule, which is the whole game

Apply when your business looks strongest, not when you need the money. Lenders weight recent trading heavily, so applying during your trough means asking to be judged on your worst months.

A Ketchum retailer applying in March, after a strong winter, is a different applicant from the same retailer applying in May with two dead months behind them. The business is identical. The answer often is not. Arrange the facility while trading is good, hold it unused, and draw on it when the quiet arrives.

This is the single most valuable and least followed piece of advice in small business finance, and it costs nothing to act on.