How Much Unpaid AR Is Too Much for a Small Business?

There is no dollar limit. The test is proportion and age. If unpaid AR runs more than about one and a half months of revenue, or more than 15 percent of it sits past 60 days, you're carrying too much. Your aging report tells you. The total never does.

What counts as too much unpaid AR?

Those are practitioner observations, not a published benchmark. Ten years of cleanup work in construction, trades, hospitality, and services, and this is where the shape sits. One assumption before anything else: all of this describes accrual books, where the invoice hits your financials the day you send it. On cash basis there is no AR on your balance sheet at all, and most of what follows does not apply to you.

"$180,000 in receivables" means nothing by itself. On a $2.5M business that is a tight book, under a month of sales still in transit, and nobody should lose sleep over it. On a $900K business the same $180,000 is nearly two and a half months of revenue. That one is a fire.

Divide AR by your average monthly revenue. That's months of revenue sitting unpaid. Fastest read there is on a number you've only ever seen as a total, and it costs you one minute and a calculator.

Two things break this ratio. Seasonal revenue, where a roofer running the math in February divides against a dead month and gets a nonsense read, so use a trailing twelve month average instead of last month. And work you've done but never billed: unbilled WIP and retainage a general contractor is sitting on never show up on an aging report at all, and on a project shop that is usually the bigger hole in your cash.

Same math as days sales outstanding, different units. Two months of AR is a DSO somewhere near 60, so if you already track that number every month you can skip this ratio entirely. One catch. DSO runs on credit sales and this ratio runs on all of it, so if you collect a real share at point of service or on a card, back that out of the denominator first or the number flatters you.

The aging shape matters more than the total

Picture two firms holding the same $180,000. One has every invoice under 30 days old. The other has $60,000 past 90 days and a folder of excuses attached to it. Identical totals. One of them is fine.

Age is the signal, not size.

Pull the AR aging report, which buckets every open invoice by how late it is: current, 1-30, 31-60, 61-90, and 90-plus. Rough shape of a healthy book, from the service and trades work I clean up:

• Current and 1-30 days: 80 percent or more. Most of what you are owed should be young.
• 31-60 days: 10 to 15 percent. Normal drift, nothing to chase hard.
• 61-90 days: under 5 percent. Watch this bucket.
• Over 90 days: near zero. Every dollar here needs a name and a date.

When that shape goes wrong, the cause is rarely dramatic. It's one of four things, and you'll know yours immediately. You invoice at month-end instead of the day the work finishes, so a third of the month evaporates before the clock starts. Your terms say net 45 because they said net 45 in 2019. Nobody owns follow-up, so reminders go out when someone happens to remember. Or there's a quiet scope dispute nobody escalated, and the invoice ages while each side waits for the other to bring it up.

Keep two numbers apart here, because they get confused constantly. Healthy is under 5 percent of your AR past 60 days. Fifteen percent is not the target, it's the alarm. Cross it and you are looking at something that broke inside your own operation, most often billing timing or a follow-up queue nobody owns. Not your client list.

How much of my AR is realistically uncollectible?

Less than you fear. More than you have booked, which is probably nothing at all, because the whole balance gets treated as money already earned and therefore money already safe.

A rough decay curve, practitioner observation and nothing more:

Almost nobody under $5M books an allowance for credit losses, the line that says out loud that some of this will never arrive. You may know it as the allowance for doubtful accounts. Same line, older name, and the current standard wants a forward-looking estimate rather than a replay of what went bad last year. Most owners have that backwards in both directions. GAAP does not treat the allowance as optional, so statements you hand a lender or a buyer without one aren't merely optimistic, they're wrong. Tax runs the opposite way and won't let you deduct a reserve at all. There you deduct the specific invoice, in the year you charge it off, and only if you booked the income in the first place. Age alone doesn't get you there either: 180 days is your bookkeeping policy, while the deduction wants facts showing the money is actually gone. On cash basis you never booked it, so the write-off buys you nothing at tax time.

Chase it for the cash, not for the deduction.

Skip the allowance and every report you read runs a little optimistic, permanently. Margins look better than they are. Equity looks better than it is. Then a real decision lands, a hire or a truck or a lease, and you make it against a total that still counts invoices from a client who stopped answering the phone in March.

That last row is where you'll want to argue with me. Fine, keep chasing it. Just stop carrying it as an asset while you do, because a balance sheet stuffed with dead invoices overstates your equity, and clean receivables are one of the things that move the price when you sell the business.

Why does one big client make a clean AR number lie?

Because averages hide concentration. Your AR can read a comfortable 1.2 months while 40 percent of the balance belongs to one client who has been slow since last spring.

Run one more cut. AR by client, largest first, no exceptions for the ones you like. If any single client holds more than roughly a quarter of your open receivables, that is not a receivable. That is exposure to one company's cash habits.

One client, one bad month, and your cash plan is fiction.

The fix is unglamorous: a deposit on new work, tighter terms for that client specifically, and a hard stop on starting anything new while an old invoice ages past 60 days.

What do I do if my AR is already too high?

Biggest lever first.

1. Pull the aging report today. Not the total, the buckets, sorted by client.
2. Call the over-60 list. Not email. Call. A large share of what sits past 60 days is a lost invoice, a wrong PO number, or an approver who left, and those clear inside a week once a human asks. Keep the words boring on purpose: "I'm looking at invoice 1042 from March 3 and want to make sure it reached the right person. Can you check where it sits on your end?" You're calling about a document, not a debt, and that is why it does not cost you the relationship. Still open a week later, ask for a pay date and get it in writing. They miss the date they gave you, stop starting new work until it clears. Document, then date, then leverage.
3. Write off the dead ones. Past 180 days with no contact and no promise, it comes off. You're not surrendering the money. You're surrendering the fiction. One warning if you run a trades or construction shop: your lien and notice rights run on a far shorter clock than 180 days, and it is different in every state. Get your date from your attorney before you let a job invoice quietly age past it.
4. Fix intake, not just the backlog. Bill the day work is done, take a deposit on anything sizable, put a payment link on the invoice itself.
5. Put the aging in front of you monthly. Buckets and your top five clients, one page, same meeting as the rest of your numbers. Not the week cash gets tight and you go looking for what happened.

Steps 1 and 2 usually recover more cash in ten days than a whole quarter of selling harder.

The bottom line

Too much AR is a shape, not a number: more than about a month and a half of revenue outstanding, or more than 15 percent of it past 60 days. Both are practitioner observations, not a rate card.

Here's the part nobody says out loud. A fat AR balance feels like wealth. It sits under "assets," it makes a thin month look survivable, and it lets you tell yourself the business is doing better than the bank account suggests. It isn't wealth until it clears.

Go pull your aging report. If the shape is wrong, what fixes it is a one-time AR cleanup and then a monthly close that keeps it from drifting back. That is the engagement to ask KLYVNT for.