Debtor days: why your cash flow problem is really a collection problem

Plenty of businesses that run out of cash are making a profit. The sales are booked, the margin is fine, the money is real. It is just sitting in someone else's bank account, as invoices that have not been paid yet.

That gap has a name. Debtor days: the average time it takes your customers to actually pay you. It is one of the most useful numbers a business can watch, and one of the least watched.

What debtor days measure

Debtor days tell you, on average, how many days pass between raising an invoice and the cash landing. Thirty days means customers pay in a month. Sixty means your cash spends two months as someone else's working capital before it finds its way back to you.

Debtor days = (trade debtors ÷ revenue) × 365

Run it across a rolling twelve months and you have a single figure to track. The direction matters more than the number itself: rising debtor days mean cash is getting slower, even when sales look perfectly healthy.

Why it quietly costs you

Every day of debtor days is a day you are financing your customers. You have paid for the stock, the staff and the work. They have the goods or the service. You are the one waiting for the money, and while you wait, you are covering the gap out of your own cash or your overdraft.

Pull debtor days from sixty down to forty and you free up two thirds of a month of revenue in cash, without selling a single extra thing. For most businesses that is the fastest cash they will ever find, and it was theirs all along.

How to bring them down

None of the levers are clever. Most businesses just never quite get around to them.

• Invoice the day the work is done, not at month end. The clock only starts when the invoice goes out, so a week's delay in billing is a week added to every payment.
• Make the terms shorter, and visible. "Due in 14 days" collects faster than "30 days", for the obvious reason. Put them where the customer will actually see them.
• Chase before it is late, not after. A polite nudge a few days ahead of the due date does more than three sharp ones after it.
• Make paying easy. A payment link on the invoice beats bank details buried at the bottom of a PDF.
• Know who is always late, and treat them differently: a deposit, tighter terms, or a quiet word.

Boring, all of it. Also the whole difference between waiting sixty days and waiting forty.

Where Dash AI fits

Dash connects to Xero, QuickBooks or Sage and tracks debtor days as they move, next to the cash flow they feed. You see the number climbing before it becomes a problem, and you see what a change in terms would do to your cash weeks ahead, rather than after the fact. The chasing is still yours to do. Dash just makes sure you are looking at the number while there is still time to act on it.

The honest version

Debtor days will not save a business whose customers genuinely cannot pay, and they will not help if the real problem is that you are not charging enough. This is a working capital lever, not a profit one. But for the very common case, profitable on paper and stretched at the bank, it is usually the first place to look and the cheapest thing to fix.

Common questions

What are debtor days?

The average number of days between issuing an invoice and receiving payment. It measures how quickly a business collects the money it is owed.

What is a good debtor days figure?

It depends on your sector and your terms, and the trend matters most. If you invoice on 30 day terms and your debtor days sit near 30, you are collecting well. If they drift towards 50 or 60, cash is leaking into late payment.

How do you reduce debtor days?

Invoice sooner, set shorter and clearer terms, chase before the due date, make payment easy, and tighten terms for habitually late payers. The biggest single gain is usually invoicing the moment the work is finished.