The shape of a credit line balance reveals the business behind it

The most useful example of a line of credit is your own. Plot the balance on your facility over the last two years and the shape of the line will tell you more about the health of your business than any case study could.

There are no invented businesses below and no figures. There are five shapes, what each one means, and what to do about it.

What to take away

Draw the line first

You need two series, both from your own statements, month by month for as long as you have them.

Month-end figures alone will mislead you, because a balance cleared for a few days around a statement date hides everything that happened in between. The gap between the two lines is how hard you are using the facility. The path of the lower line is the diagnosis.

The five shapes

Clean sawtooth

Money goes out, money comes back, the balance clears. This is what the product is for, and it is the only pattern where the facility is doing the job it was designed to do.

Two things still matter. Compare the peaks: if they climb year on year while troughs still reach zero, you are growing and the limit may need revisiting before it binds.

Also check the number of separate draws, because on a facility with a per-draw charge, a busy sawtooth can cost far more than the rate suggests. The arithmetic is in the lines of credit calculator.

Rising floor

The balance still moves up and down, but each low point is a little higher than the last. This is the pattern most worth catching early, because it is invisible month to month and obvious across two years.

A rising floor means each cycle is returning slightly less than it consumed. The causes are ordinary: margins slipping, customers paying more slowly than they used to, costs rising ahead of prices, or growth consuming cash faster than it produces it. None of them is a financing problem, and none of them is fixed by a larger limit.

Find which one it is from your own numbers before you ask anyone for more availability. If the answer is that customers have simply become slower, invoice financing addresses that specific cause directly.

The step

The balance jumps once, for something identifiable, and then stays roughly there. A vehicle, a fit-out, a settlement, a bad quarter covered in a hurry.

What has happened is that permanent capital is being carried on a revolving facility, which means paying short-term pricing indefinitely and holding the risk that the facility is reduced or not renewed. It also means your availability is gone, so the next timing gap has nowhere to go.

The remedy is to move the step off the facility. If it bought an asset, that asset may secure its own financing more cheaply, which is what equipment financing exists for. If it covered a loss, a term loan sized to the real amount at least gives it a schedule and an end date.

The flat top

The balance sits near the limit and rarely moves. At this point the facility has quietly converted into a term loan without an amortization schedule, and the revolving feature you are paying for is doing nothing.

This is also the pattern that precedes the worst decisions. A business with no headroom and an unexpected bill goes looking for money quickly, and quick money is expensive money. Recognizing a flat top early is what keeps the next step from being a merchant cash advance taken under time pressure.

Anything that restores headroom is worth more here than a better rate. That usually means addressing what put the balance there, not refinancing it.

The flat zero

The line never moves. You have a facility, you have never drawn on it, and you are paying the standing charges every year regardless.

That is not automatically wrong. Availability has genuine value if the thing it protects against would be catastrophic and sudden. But it is a decision that deserves a number rather than a feeling. Divide what you pay in a year by the borrowing you realistically expect, and see what the option costs per dollar.

Sometimes it is worth it. Sometimes a smaller limit costs less and covers the same risk. The charges that accrue at a zero balance are set out in lines of credit cost.

What the shape does not tell you

It is a description of what happened, not a forecast. A clean sawtooth built on one large customer is fragile in a way the chart cannot show. A rising floor during a deliberate expansion may be exactly what you planned.

Use the shape to decide what question to ask next, then answer it from the underlying numbers rather than from the picture. The structural background to how the two states are priced is in lines of credit.

Where to check anything specific

Your own statements are the source for all of this. For neutral background on business financing generally, the SBA business guide and the FDIC's Money Smart for Small Business sell nothing.

Common questions

Why the minimum balance rather than the month-end balance?

Because a balance cleared briefly around a statement date hides the real position. The lowest point each month is the part that does not lie.

How far back should I plot?

At least two years if you have them, so a seasonal pattern can be told apart from a trend.

My line shows a rising floor. Should I ask for a bigger limit?

Not first. A larger limit lets a structural deficit run longer. Find the cause in your own numbers, then decide what instrument fits it.

What if my facility is new and there is nothing to plot?

Plot it forward. Record the low point each month from the start, and you will have the diagnosis available long before it becomes urgent.