How to Reduce Debtor Days and Get Paid Faster

You did the work. You sent the invoice. And then... nothing.

A week passes. Then two. You chase. You get a reply saying, "it's in the system." Another week goes by. Meanwhile your own supplier bills are due, your payroll is coming up, and that invoice is still sitting unpaid.

If this sounds familiar, you are not alone. Late payment is one of the biggest cash flow problems facing small businesses across the UK. According to Xero's State of Late Payment report, UK small businesses are owed billions in overdue invoices at any given time and the average invoice is paid 8.4 days late.

The good news is that most late payment problems are fixable. Not by chasing harder, but by setting up the right systems before the invoice even goes out.

What Are Debtor Days — and Why Do They Matter?

Debtor days (also called Days Sales Outstanding or DSO) measure how long it takes your business to collect payment after making a sale.

The formula is straightforward:

Debtor Days = (Trade Debtors ÷ Annual Revenue) × 365

So, if your trade debtors on the balance sheet are £40,000 and your annual revenue is £480,000, your debtor days are:
(£40,000 ÷ £480,000) × 365 = 30.4 days

That means on average you are waiting just over 30 days to collect payment. Whether that is good or bad depends on your payment terms but if your terms are 30 days and your debtor days are 45, you have a problem.

High debtor days mean your cash is tied up in unpaid invoices rather than sitting in your bank account. That gap between doing the work and getting paid is what causes cash flow crises even in profitable businesses.

To understand how trade debtors sit on your balance sheet and why they matter for your overall financial position, read our guide: What Are Trade Debtors and Trade Creditors?

What Is a Good Debtor Days Figure?

There is no universal answer, it depends on your industry and your payment terms. But as a general benchmark:

If your terms are 14 days but your debtor days are 50, that is a significant gap, and something needs to change. If your industry standard is 60-day payment terms (common in construction and wholesale), then 60 days may be perfectly normal for you.

The key is to know your number, track it monthly, and understand what is driving it.

8 Practical Ways to Reduce Your Debtor Days

1. Run a Credit Check Before You Extend Credit

The easiest way to avoid a late-paying customer is to know who you are dealing with before you start work.

For new customers, especially larger orders or ongoing contracts run a basic credit check. Services like Creditsafe or Experian Business give you a snapshot of a company's payment history, county court judgements (CCJs), and financial health in minutes.

If a business has a history of paying late or has CCJs registered against it, that is important information before you commit to 60 days of credit exposure.

For lower-risk or smaller customers, a simple Companies House check at find-and-update.company-information.service.gov.uk tells you whether the business exists, who the directors are, and whether they have filed accounts recently.

Practical step: Set a credit limit policy. For example — new customers get £2,000 credit on 14-day terms until they have a payment history with you. Review and increase from there.

2. Set Clear Payment Terms From the Start

Vague payment terms lead to vague payment behaviour. If your invoice just says "payment due upon receipt" or has no due date at all, you have given your customer no clear deadline to work to.

Your payment terms should be agreed in writing before work starts, ideally in a signed contract or at minimum a written quote or order confirmation. They should clearly state:

• The payment due date (e.g. 30 days from invoice date)
• Your accepted payment methods (bank transfer, card, direct debit)
• Your late payment policy — including interest charges if applicable

Under the Late Payment of Commercial Debts (Interest) Act 1998, you have a legal right to charge 8% above the Bank of England base rate on overdue B2B invoices, plus a fixed compensation fee. Most businesses never use this — but having it in your terms gives you leverage.

Practical step: Review your standard terms and conditions today. If you do not have written T&Cs, that is the single most important thing you can fix this week.

3. Invoice Immediately — Not at the End of the Month

Every day you delay sending your invoice is a day added to your debtor days before the clock even starts.

Many small businesses fall into the habit of batching invoices, sending them all at the end of the month regardless of when the work was completed. If you finish a job on the 2nd but do not invoice until the 31st, you have already wasted 29 days.

Invoice the same day the work is completed, or the goods are delivered. If your payment terms are 30 days, that is when your 30-day clock starts, not when you get round to raising the invoice.

Also check your invoices are correct before sending. Wrong PO number, incorrect VAT treatment, wrong address — all of these give a customer a reason to delay payment while the "error" is resolved. Errors on invoices are one of the most common causes of delayed payment in B2B businesses.

Practical step: Set a rule in your business, invoices go out the same day as delivery or completion, without exception.

4. Make Paying as Easy as Possible

The harder it is to pay you, the longer it takes. If your only payment option is a BACS bank transfer that requires your customer to log into their online banking, manually type your sort code and account number, and create a new payee — that is friction.

Remove as much friction as possible:

• Add a "Pay Now" button to your invoices using tools like GoCardless, Stripe, or your accounting software's built-in payment links (Xero and QuickBooks both offer this)
• Accept card payments — even for B2B invoices, some customers prefer to pay by card
• Set up direct debit for repeat customers — GoCardless integrates directly with Xero and QuickBooks and lets customers authorise recurring or variable payments automatically
• Include your bank details on every invoice — obvious, but often missed

For recurring customers on regular contracts, direct debit is the single most effective tool for eliminating late payment. Payment happens automatically on the due date. No chasing. No reminders. No excuses.

5. Build a Chase Rhythm — Before and After the Due Date

Most businesses only chase invoices after they become overdue. The best-run businesses start the process before the due date.

A simple chase rhythm looks like this:

The pre-due-date reminder alone makes a significant difference. It means your invoice is not buried in a pile when the due date arrives, the customer has already had it flagged.

Automate this where possible. Xero and QuickBooks both have automated payment reminder features that send emails at intervals you set. Once configured, it runs without you lifting a finger.

6. Ask for Deposits or Stage Payments

For larger jobs or longer projects, do not wait until completion to invoice. Ask for a deposit upfront and build in stage payments throughout the project.

This is standard practice in construction, consulting, creative services, and many other sectors and customers expect it. A typical structure might be:

• 30–50% deposit on signing
• 30–40% at a project milestone
• Remaining balance on completion

This approach reduces your debtor days significantly because you are never carrying the full value of a large project as an unpaid debt. It also reduces your risk, if a client disappears halfway through, you have not completed the work without any payment.

Practical step: For any new project over a certain value (say £2,000), make a deposit non-negotiable. Put it in your proposal template.

7. Review Your Top 10 Debtors Every Month

You do not need to monitor every invoice equally. In most businesses, 80% of your outstanding debt sits with 20% of your customers.

Pull your aged debtor report from Xero or QuickBooks at the end of every month and look at your top 10 outstanding balances. Ask:

• Who has been overdue for more than 30 days?
• Is this a one-off or a pattern with this customer?
• Have we had any disputes or queries from this customer?
• Should we put this customer on stop until they pay?

Reviewing your top debtors monthly keeps the problem visible and ensures you are focusing your credit control effort where the money is.

8. Know When to Escalate

Sometimes, despite your best efforts, a customer simply does not pay. At that point you need to escalate.
Options available to UK businesses include:

• Debt collection agency —they chase on your behalf, typically for a percentage of what is recovered
• Statutory demand — a formal legal notice under the Insolvency Act 1986 that can lead to winding-up proceedings if unpaid
• Small Claims Court — for debts under £10,000, you can make a claim through GOV.UK Money Claims online
• County Court Judgement (CCJ) — if your claim is successful and still unpaid, you can apply to have it enforced

Escalation should follow a clear process, not be a reactive decision made in frustration. Know your thresholds in advance: at what point does a debt go to a collection agency? At what point do you issue a statutory demand?

For guidance on late payment legislation and your rights as a creditor, the Federation of Small Businesses (FSB) has practical resources specifically for UK SMEs.

How to Track Your Progress

Reducing debtor days is not a one-time fix, it is an ongoing process. Track these numbers monthly:

• Debtor days — calculate monthly using the formula above
• Aged debt split — what percentage of your debtors are 0–30, 31–60, 61–90, 90+ days?
• Invoices disputed — how many invoices were queried or delayed due to errors?
• Collection rate — what percentage of invoices were paid within your terms?

Most of this data is available directly in Xero or QuickBooks without any manual calculation. Set aside 20 minutes at the end of each month to review it.

FAQs — Reducing Debtor Days

What is a good debtor days ratio for a small business? For most small businesses on 30-day payment terms, debtor days under 35–40 is healthy. If you are consistently above 50 days on 30-day terms, your credit control process needs attention.

Can I charge interest on late payments in the UK? Yes. Under the Late Payment of Commercial Debts (Interest) Act 1998, you can charge 8% above the Bank of England base rate on overdue B2B invoices. You can also charge a fixed compensation fee of £40, £70 or £100 depending on the debt size. See GOV.UK for full details.

Does invoicing software actually help reduce debtor days? Yes, significantly. Automated payment reminders, online payment links, and real-time aged debtor reports all reduce the time between invoicing and payment. Xero and QuickBooks both have strong credit control features built in.

What should I do if a customer refuses to pay? Start with a formal letter before action, then consider the Small Claims Court for debts under £10,000 or a debt collection agency for larger amounts. Keep records of all communication and copies of the original invoice and contract.

How does debtor days affect my cash flow forecast? Your debtor days figure tells you when cash will actually arrive in your bank, not when you raise the invoice. Any cash flow forecast that ignores debtor days will be inaccurate. If your debtor days are 45 but your forecast assumes 30-day collection, you will consistently underestimate your cash position.

Final Word

Reducing debtor days does not require confrontation or awkward conversations. It requires clear systems, set up once, run consistently.

Get your terms in writing. Invoice immediately. Make payment easy. Chase before the due date, not after. Review your aged debtors monthly. Escalate when needed.

Do those six things consistently and your debtor days will come down, your cash flow will improve, and you will spend a lot less time chasing invoices.

If you would like help reviewing your debtor position, setting up credit control processes, or getting your cash flow forecast in order, book a free 30-minute consultation with YRF Accountants. We work with SMEs across Bolton, Manchester, and Greater Manchester.