Late payment is often treated as an accounting problem.
For a growing SME, it is really an operating-system problem.
The invoice may sit in Xero, QuickBooks or another finance platform, but the causes of slow payment often start much earlier: unclear scopes, missing purchase-order numbers, weak approval processes, inconsistent invoicing, poorly controlled variations or nobody clearly owning the follow-up.
That matters even more now because the UK is moving towards a tougher approach to late commercial payments.
The Commercial Payments Bill was introduced to Parliament in May 2026. Proposed measures include stronger powers for the Small Business Commissioner, maximum payment terms and stronger consequences for persistent poor payment practices. These are developing proposals rather than measures SMEs should assume are already law.
The direction of travel is nevertheless clear: payment performance is becoming a more visible business issue.
SMEs should welcome stronger protections.
But legislation alone will not fix a weak quote-to-cash process inside your own business.
Cash flow starts before you send the invoice
A common mistake is to begin thinking about payment when an invoice becomes overdue.
By then, many of the problems have already happened.
Imagine a contractor completes a £12,000 project.
The work is finished on Friday, but the invoice is not raised until the following Wednesday.
The customer then rejects it because a purchase-order number is missing.
It goes back into the queue, gets resubmitted and eventually enters the customer's payment process.
The customer may technically pay the corrected invoice on time while the supplier still waits significantly longer than expected to receive the cash.
The better question is therefore not: “How quickly do we chase debt?”
It is: “How quickly and reliably does completed work become collected cash?”
Map your quote-to-cash process
For most SMEs, the first improvement is visibility.
Map the journey from the first customer commitment through to money arriving in the bank.
A simple version might be:
Enquiry → Quote → Acceptance → Purchase order → Delivery → Completion evidence → Invoice → Customer approval → Payment → Reconciliation
Now look for the delays.
- Does work start without written acceptance?
- Are PO requirements checked before delivery?
- Does somebody have to remember to raise invoices manually?
- Are variations agreed before additional work is completed?
- Can the finance team see when a job is genuinely ready to invoice?
- Are overdue accounts reviewed consistently?
Most cash-flow friction hides in the handovers between these stages.
Make invoice readiness part of delivery
Good invoicing should not require somebody to reconstruct the job after it has finished.
By completion, the business should already have the information needed to bill accurately.
Depending on the business, that could include:
- Customer and billing details
- Agreed quotation or contract
- Purchase-order number
- Agreed variations
- Labour or time records
- Materials or expenses
- Delivery notes
- Completion photographs
- Sign-off or other evidence
The exact list will differ by sector, but the principle is the same.
If the evidence needed for invoicing is collected during delivery, invoices can be raised faster and disputed less often.
Give somebody ownership of receivables
“Accounts looks after it” is not a process.
Every business should know who owns each stage once an invoice has been raised.
That does not necessarily require a dedicated credit controller.
In a small company it may be the owner, administrator or finance support.
What matters is clarity.
A basic routine could include:
- Checking invoices due in the next seven days
- Reviewing overdue invoices weekly
- Following up when agreed terms are missed
- Recording disputes and promised payment dates
- Escalating persistent issues
- Reviewing customers with repeated poor payment behaviour
This turns credit control from occasional chasing into a management process.
Current UK law already provides mechanisms for claiming interest and debt-recovery costs on qualifying late commercial payments, while public authorities generally operate on 30-day terms.
Measure the right numbers
Turnover can look healthy while cash flow quietly deteriorates.
That is why SME dashboards should include more than sales.
Useful measures can include:
Debtor days: how long customers are actually taking to pay.
Overdue receivables: how much money is currently past its agreed payment date.
Invoice lag: how long it takes between completing work and raising the invoice.
Disputed invoices: how much cash is held up because something is wrong or unclear.
Cash conversion: how effectively completed work becomes money in the bank.
You do not need a complicated finance department to track these.
A small set of useful numbers reviewed consistently is far more valuable than a large dashboard nobody acts on.
Do not let growth make the problem worse
Late payment becomes especially dangerous when a business is growing.
More sales can mean more wages, materials, subcontractors and overheads need funding before customer cash arrives.
A company can therefore be profitable on paper and still create serious pressure on its bank balance.
Before taking on a large new customer or contract, ask:
- What are the payment terms?
- How quickly can we invoice?
- Are there application-for-payment or approval stages?
- How much working capital will delivery consume?
- What happens if payment arrives 15 or 30 days later than expected?
- Can we afford to fund several jobs for this customer simultaneously?
Commercial decisions should consider cash timing as well as headline revenue and margin.
Better payment discipline works both ways
SMEs should also think about how they pay their own suppliers.
The Fair Payment Code replaced the previous Prompt Payment Code and recognises businesses according to payment performance, while public-sector contracts carry prompt-payment expectations through supply chains.
A business that wants better treatment from customers should build the same discipline into its own supplier relationships.
That means agreeing terms clearly, resolving disputes quickly and avoiding the temptation to use smaller suppliers as an unofficial source of working capital.
Good payment behaviour strengthens supplier relationships and makes your business a better customer to work with.
What should SMEs do now?
Do not wait for new legislation before improving the system.
Start with a simple review of the last ten invoices that were paid late or took longer than expected.
For each one, ask why.
You may find that the customer was genuinely late.
But you may also find recurring internal causes: missing information, slow invoicing, unclear variations, absent POs or inconsistent chasing.
Fix the recurring causes first.
Then establish a weekly receivables review and a small set of cash-flow KPIs.
That combination gives you something far more useful than aggressive debt chasing:
A repeatable system that helps cash move through the business properly.
How Blueprint can help
Blueprint helps SMEs design the systems behind growth.
That includes mapping workflows, clarifying responsibilities, improving management information and turning informal processes into practical operating systems that people can actually follow.
If your business is growing but cash flow, invoicing or operational handovers are becoming harder to control, the answer may not be another spreadsheet or another piece of software.
It may be redesigning the process around them.
Every great business is designed.
Research sources and technical note
This article reflects the legal and policy position reviewed on 4 September 2026. The Commercial Payments Bill remains proposed legislation and may change before becoming law. This article provides general operational guidance, not legal, financial or debt-recovery advice.