The Payment Term Nobody Enforces: Fixing Your Debtor Days
Long payment terms and loose follow-up quietly fund your clients' cash flow instead of yours. Here's how to tighten the gap between finished work and money in the bank.
Most accounting firms can tell you their fees to the dollar. Far fewer can tell you how long they wait to actually collect them. The number sits in a corner of your accounting software, rarely discussed: average debtor days. And for a lot of practices, it's quietly creeping past 45, 60, even 75 days — which means you're funding your clients' working capital out of your own bank account.
The uncomfortable part is that most of this isn't a client problem. It's a process problem. Slow collections are usually the result of terms you never enforce, invoices you send late, and follow-ups that depend on someone remembering to chase. Fixing it doesn't require harder conversations. It requires a tighter system.
Why debtor days matter more than your fee list
A firm turning over $1.2M a year with 60 debtor days has roughly $200,000 tied up in unpaid invoices at any given moment. That's money you've earned, work you've delivered, and cash you can't use — to hire, to invest, or simply to smooth out a quiet month.
Debtor days also compound. The longer an invoice sits, the harder it becomes to collect. Fresh invoices get paid. Aged ones get queried, forgotten, or disputed. Every week you let an invoice drift, the probability of a clean payment drops and the effort to recover it rises.
So the goal isn't just "send invoices." It's to compress the whole distance between finished work and money received — at every stage.
Where the days actually leak
When firms measure it honestly, the delay rarely lives in one place. It's spread across four gaps:
- Work finished, invoice not raised. The job is done, sitting in the completed column, but nobody's billed it yet. Days pass while it waits for a batch billing run.
- Invoice raised, not sent. It's drafted but stuck behind a partner review, or waiting on a covering email that never gets written.
- Invoice sent, term too long. Your default is 30 days when it could be 7 or 14. You've built the delay into the paperwork.
- Term passed, no follow-up. The invoice is overdue and nobody's chasing, because chasing is manual and awkward and always slips down the list.
Each gap looks small on its own. Stacked together, they're your debtor days.
Bill at the moment work is done, not at month-end
The single biggest lever is closing the gap between completion and invoice. If your billing happens in one monthly run, every job you finished on the 2nd waits nearly a month just to be invoiced — before the client's payment term even starts.
The fix is to tie billing to a trigger, not a calendar. When a job hits "complete" — or when an engagement is signed for fixed-fee work — that should be the moment an invoice is raised. In practice management systems like Finye, you can connect the work item to the invoice directly, so finishing the job prompts the bill rather than deferring it to a batch you run when you get a spare afternoon.
This is where good accounting client management software earns its keep. When your client records, your work items and your invoicing live in the same place, there's no re-keying, no separate spreadsheet of "what to bill," and no job that quietly goes unbilled because it fell off someone's list.
Shorten your default terms — and mean it
Look at your standard payment term. If it's Net 30 out of habit, ask why. For recurring compliance work and smaller fixed fees, 7 or 14 days is entirely reasonable, and clients rarely object when the term is clear from the engagement letter onward.
Better still, remove the wait entirely where you can. Adding a pay-now option to every invoice — via Stripe or Square — turns "I'll get to it" into a two-tap payment. For clients who'd otherwise sit on your invoice until their own bookkeeping day, the friction of a bank transfer is often the real delay, not reluctance. Take that friction away and a meaningful share pay on the spot.
Make the follow-up automatic, not personal
Chasing overdue invoices is the task everyone hates and nobody prioritises. It feels confrontational, it's tedious, and it's easy to defer. So it doesn't happen — and the debtor sits.
The answer is to stop relying on willpower. A reminder that fires automatically at day 3 overdue, then day 10, then day 21, does the awkward work for you and does it consistently. It's not personal, it's not forgotten, and it doesn't depend on anyone's mood. When a real conversation is needed, you'll know — because the automated sequence has run and the invoice is still outstanding, which tells you something a silent debtors ledger never would.
The same principle applies to the client experience side. When invoices and receipts sit in a client portal alongside the rest of their engagement, clients can see what they owe without emailing you, and pay without hunting for a PDF from three weeks ago. Removing that friction is quietly one of the most effective collection tools you have.
Watch the number, not just the invoices
You can't improve what you don't measure. Pick a small set of figures and check them monthly:
- Average debtor days — the headline number. Trend it over time.
- Days from job completion to invoice sent — this is the gap most firms ignore, and often the largest.
- Percentage of invoices paid within terms — tells you whether your terms are realistic and your follow-up is working.
- Value of debtors over 60 days — your genuine risk pile, the invoices most likely to turn into write-offs.
If your client accounting software and your practice system share data through a two-way Xero sync, these numbers are easy to keep in front of you rather than buried in a report you run once a quarter.
The compounding win
None of these changes is dramatic on its own. Bill on completion instead of month-end and you save two or three weeks. Drop terms from 30 days to 14 and you save another two. Add a pay-now button and automated reminders and you catch the slow payers before they drift.
Together, they can pull average debtor days down by half — and that's cash that moves from your clients' accounts back into yours, without a single difficult phone call. The firms that get paid fastest aren't the ones with the toughest credit control. They're the ones who removed the delay from the process so it never had a chance to build.