Late payments leave UK businesses owed an estimated £26 billion at any given time, affecting around 1.5 million businesses, or 28% of UK businesses, each year. The wider drag is almost £11 billion annually, with about 14,000 businesses closing each year because of late payments, according to UK late-payment research. That makes the answer to how to improve cash flow less about finding one clever funding product and more about shortening the time between delivering value, collecting money, and paying suppliers.
I've helped more than 200 SMEs untangle working-capital problems, and the pattern is consistent. The businesses that improve cash flow fastest don't start by cutting random costs. They identify the leak, attach it to a metric, fix the process, and then use Odoo ERP workflows to stop the old behaviour returning.
Table of Contents
Diagnose Where Cash Is Actually Leaking
The fastest way to improve cash flow is to stop treating the bank balance as a diagnosis. It's an outcome. The useful question is whether cash is trapped in receivables, inventory, or payment timing.
Set aside 30 minutes for a self-audit. Start with your aged debtors report and split unpaid invoices into 0 to 30, 31 to 60, 61 to 90, and 90+ days. Then read aged creditors using the same buckets. In Odoo Accounting, reconcile the bank feed against the ledger so the report reflects actual receipts and payments rather than stale entries.
Pull the three working-capital numbers
Calculate:
- Debtor days, or DSO: How long customers take to pay after invoicing.
- Creditor days, or DPO: How long your business takes to pay suppliers.
- Inventory days: How long cash remains tied up in stock before sale.
Together, these figures explain the cash conversion cycle:
Cash conversion cycle = debtor days + inventory days - creditor days
If DSO is high, collections are the first lever. If inventory days are rising, purchasing and demand planning need attention. If DPO is unusually short, your team may be paying suppliers before the business has collected from customers.
UK businesses face sector-specific pressure. A government late-payments study found a mean late-payment share of 17%, rising to 21% in goods, 19% in pharmaceuticals, and 18% in construction, while services averaged 16% and insurance 11%. UK SMEs were owed an average of £22,000 in late payments in 2022, as reported in the UK prompt payment and cash-flow review.
Construction retentions, habitual 60 to 90-day terms, and stock purchased against an outdated forecast are common causes. Don't accept a customer's payment pattern as a fixed fact if the contract, milestone, or credit limit can be changed.
Finish the audit on one page:
- Total overdue receivables by ageing bucket.
- The three oldest or largest overdue accounts.
- Current DSO, DPO, inventory days, and cash conversion cycle.
- Supplier payments due before the next expected customer receipts.
- One action owner and deadline for each leak.
For a broader step-by-step cash flow strategy, use the same principle: every recommendation should lead to an owner, a date, and a measurable movement in working capital. Your Odoo reports should become the working document, not a spreadsheet copied from the ledger at month end. The accounts payable and receivable guidance for UK SMEs is useful when you need to map those controls into an ERP process.
Speed Up Receivables and Tighten Credit Control
Receivables usually offer the quickest route to better cash flow because the sale has already happened. The mistake is to apply every tactic at once without knowing which one should move DSO.
Change the commercial terms first
Review customers using 60-day terms and decide whether the relationship genuinely needs them. Moving a default term from 60 days to 30 days changes the expected collection date, although it may affect conversion rates or customer negotiations. For customers who value speed, a 2% prompt payment discount for settlement within seven days can work, but check the VAT treatment with your accountant and refer to UK Practice Note 7/2017 before configuring the discount.
Invoice when goods leave the premises or when a project milestone is reached. Waiting until month end adds avoidable time to DSO. Your PDF invoice should contain the legal entity details, a unique invoice number, the UEN, purchase order reference, payment terms, and clear bank details. A missing purchase order is often an administrative objection disguised as a payment delay.
Build a collection sequence
Use a four-touch cadence:
- Day 3: Confirm the invoice arrived and ask whether anything is missing.
- Day 7: Send a concise payment reminder with the invoice attached.
- Day 14: Contact the accounts-payable team and the commercial owner.
- Day 21: Escalate to a phone call, then apply a stop-order flag where policy allows.
Run a credit check on new B2B customers through Companies House and set a hard credit limit. The trade-off is straightforward. A tighter limit can lose some sales, but an unlimited order book financed by your own bank account isn't growth.
| Action | Effort | Expected DSO Reduction (days) | Cash Released (£k) |
|---|---|---|---|
| Shorten default terms from 60 to 30 days | Medium | Not guaranteed | Depends on receivables |
| Invoice at dispatch or milestone | Low | Not guaranteed | Depends on invoice value |
| Automated reminders on days 3, 7, 14 and 21 | Medium | Not guaranteed | Depends on overdue book |
| Credit checks and customer limits | Medium | Preventative | Prevents further exposure |
A worked example shows why the metric matters. If a business reduces DSO from 52 to 34 days, it removes 18 days from the collection cycle. The cash released equals 18 days of average credit sales, so the finance team should calculate that amount from its own ledger rather than copy a generic estimate.
Odoo can automate the sequence, while specialist guidance on end-to-end invoice automation can help compare process designs. If customers pay by card or direct debit, connect the payment route to the invoice record so the expected receipt and the actual settlement stay together. The Stripe and ERP integration guide covers the integration considerations.
Stretch Payables, Free Up Inventory and Review Pricing
Receivables aren't the only side of the cash equation. A business can collect promptly and still run short of cash if it pays suppliers too early, carries slow stock, or sells at a margin that doesn't cover its working-capital burden.
Improve payment timing without damaging trust
Ask suppliers for longer terms as part of a structured proposal, not as a last-minute request. Offering consolidated weekly payment runs, reliable remittance advice, or an early-settlement option can make a move to 45 or 60 days more acceptable. Track the result through DPO, but don't use longer terms to conceal a business that can't meet its obligations.
If VAT is creating the squeeze, investigate an HMRC Time to Pay arrangement before the liability becomes urgent. Agreeing a formal plan is safer than allowing missed payments to accumulate. Odoo's supplier bill approvals and scheduled payment runs can prevent accidental early payment while preserving due-date control.
Release stock deliberately
Run an ABC analysis and separate high-value, fast-moving items from the slow-moving tail. Stop replenishment for stock that has no credible sales plan, renegotiate minimum order quantities, and set safety stock using actual lead-time variation rather than instinct. The relevant measure is inventory days, not the number of units in the warehouse.
The UK SME inventory management guide is a useful reference for translating those decisions into purchasing and fulfilment processes.
Pricing is the third lever. Review the products or services where customers show little resistance, add a materials or fuel surcharge clause where costs move, and request deposits for bespoke work. The metric is gross margin, but the cash benefit also depends on how quickly the additional margin is collected.
Don't confuse a longer DPO with free money, or a lower inventory balance with good service. Each decision has an operational cost. The right target is a shorter cash conversion cycle without creating stockouts, supplier disputes, or margin-destroying discounts.
Build a Rolling Cash Forecast and Run Scenarios
An annual budget is useful for planning profit, but it's too static for day-to-day liquidity. Cash forecasting needs expected dates. A customer paying in the wrong week can create a funding problem even when the annual revenue plan remains intact.
A rolling 13-week forecast uses one row per week:
- Opening balance: Cash available at the start of the week.
- Inflows: Expected debtor collections, recurring revenue, and other receipts.
- Outflows: Supplier payments, payroll, VAT, PAYE, rent, loan repayments, and planned purchases.
- Net movement: Inflows minus outflows.
- Closing balance: Opening balance plus net movement.
Use expected collection dates, not invoice dates. That distinction matters in the UK, where one 2026 dataset reports that small businesses waited an average of 29.3 days from issuing an invoice to receiving full payment, with invoices paid 8.3 days after their due date on average, according to UK payment statistics.
| Week | Opening Balance | Inflows | Outflows | Net Movement | Closing Balance | Scenario |
|---|---|---|---|---|---|---|
| 1 | £48k | £36k | £31k | £5k | £53k | Base |
| 2 | £53k | £34k | £29k | £5k | £58k | Base |
| 3 | £58k | £32k | £38k | -£6k | £52k | Base |
| 4 | £52k | £41k | £35k | £6k | £58k | Base |
| 5 | £58k | £30k | £33k | -£3k | £55k | Base |
| 6 | £55k | £18k | £40k | -£22k | £33k | Two-week debtor slip |
| 7 | £33k | £44k | £32k | £12k | £45k | Recovery |
| 8 | £45k | £37k | £30k | £7k | £52k | Base |
| 9 | £52k | £39k | £34k | £5k | £57k | Base |
| 10 | £57k | £35k | £36k | -£1k | £56k | Base |
| 11 | £56k | £43k | £31k | £12k | £68k | Base |
| 12 | £68k | £38k | £42k | -£4k | £64k | Base |
| 13 | £64k | £45k | £37k | £8k | £72k | Base |
This worked example uses a £150k/month-turnover SME and shows a £22k closing-balance dip in week 6 when receipts slip for two weeks. The table is a planning illustration, not a universal benchmark. Replace the assumptions with your ledger, payroll calendar, VAT obligations, and actual supplier terms.
Run three monthly views: base case, best case with collections 10% faster, and worst case where a key customer delays payment by 30 days. Update every Monday morning, move the 13-week window forward, and compare last week's forecast with actual bank movements. Odoo can combine bank feeds, invoices, bills, and payment status so the forecast reflects operational data rather than a separate finance exercise.
Choose the Right Financing Option for Your Stage
Financing should close a defined timing gap. It shouldn't compensate for invoices nobody owns, stock nobody has reviewed, or pricing that loses money.
An overdraft suits a business with reliable underlying cash generation and occasional lumpy months. It becomes expensive and risky when the limit steadily rises. Invoice finance can advance against a debtor book, while factoring adds sales-ledger administration and customer contact. The confidentiality and control requirements differ, so make sure customers understand who will manage collections.
Supply-chain finance reverses the usual pressure. The finance provider pays suppliers early at a discount, while the buyer receives longer terms that can reach 60 to 90 days under an agreed programme. It may work for a larger SME with meaningful purchasing volume, but it adds programme complexity and supplier-dependency risk.
Don't choose based on the product a bank happens to promote. Match the facility to the forecast gap, the quality of the receivables, the predictability of customer receipts, and the reason cash is trapped. Before borrowing, also review non-debt opportunities such as R&D relief for SMEs where eligible development work may support liquidity planning.
Automate the Gains with Odoo ERP and AI Workflows
Manual cash-flow controls often weaken after the immediate crisis passes. Someone forgets to chase a debtor, a purchase order bypasses approval, or the Friday forecast update gets postponed. Odoo turns those actions into rules attached to invoices, customers, suppliers, and bank transactions.
Start with receivables. Configure dunning emails from invoice ageing, such as reminders on Day 1, Day 7, Day 14, and Day 30, with an escalation to a named account owner. Add a customer risk flag when an account repeatedly passes its due date. The point isn't to send more emails. It's to make the next action visible and consistent.
For payables, use AI-assisted invoice capture to read supplier bills and create draft records from the received document. Require approval for purchase orders above a cash threshold, with managing-director sign-off for exceptions. The threshold should reflect your forecast and delegated authority policy, not an arbitrary setting.
Make the dashboard operational
Odoo Accounting can bring together:
- Bank-feed balances and reconciliation status.
- Open receivables by customer and ageing bucket.
- Supplier bills, due dates, and scheduled payment runs.
- DSO, DPO, inventory days, and cash conversion cycle.
- Forecast receipts and payments for upcoming weeks.
AI forecasting can support cash projections using historical collection behaviour, while natural-language queries can help flag anomalies, such as a customer paying 12 days late on three consecutive invoices. Treat those flags as prompts for review, not automatic credit decisions. Historical behaviour can change when a contract, project, or customer contact changes.
A connected payment stack reduces re-keying. Link bank feeds with Stripe or GoCardless, keep payment status against the original invoice, and maintain HMRC Making Tax Digital compliant submissions from the accounting records.
The AI for Odoo ERP guide covers how predictive insights and workflow triggers can support this type of setup. This video provides a practical view of Odoo accounting workflows:
Configuration still needs ownership. An ERP won't improve DSO if sales teams can override terms without review, or if nobody maintains customer contacts and bank details. Automation sustains a policy that the business has already agreed.
Track KPIs and Roll Out a 90-Day Cash-Flow Roadmap
A cash-flow programme needs a short list of measures. Track debtor days, creditor days, inventory days, current ratio, and cash conversion cycle in Odoo, and review movement rather than admiring a single month's result.
Use directional target bands agreed with your accountant and sector context. A construction company with retentions shouldn't use the same expectation as a subscription business. The useful test is whether debtor days are falling, creditor days reflect agreed terms, inventory days match service requirements, the current ratio is strengthening, and the cash conversion cycle is shortening.
Sprint one, diagnose and act
During the first 30 days:
- Week 1: Reconcile bank feeds, clean customer balances, and publish ageing reports.
- Week 2: Contact the oldest overdue debtors and confirm disputed invoices.
- Week 3: Review terms, credit limits, deposits, and milestone billing.
- Week 4: Stop unnecessary purchasing and identify slow-moving inventory.
Sprint two, forecast and redesign
During days 31 to 60, establish the rolling 13-week forecast, schedule weekly payment runs, map VAT and payroll dates, and agree escalation rules for overdue accounts. Review seasonality rather than relying on a universal emergency overdraft. Hospitality, agriculture, and retail can face predictable peaks and troughs, so stock planning and finance triggers should reflect the trading calendar, as discussed in UK SME cash-flow research.
During days 61 to 90, configure Odoo dunning, purchase approvals, payment integrations, dashboard KPIs, and scenario reporting. Then review whether financing is still needed after the operational changes.
| Symptom | Likely Cause | Corrective Action |
|---|---|---|
| Debtor days rise after month end | Invoices or reminders are delayed | Trigger invoicing at dispatch or milestone and review ageing weekly |
| Forecast variance widens | Expected receipts use invoice dates | Replace them with customer-specific collection dates |
| Inventory days increase | Replenishment follows old assumptions | Freeze slow-moving buys and revise safety stock |
| Creditor days fall | Bills are paid before due date | Introduce scheduled payment runs and approval controls |
| Current ratio weakens | Short-term liabilities rise faster than liquid assets | Rework payment timing and review the forecast before borrowing |
The UK statutory baseline for many UK B2B transactions is a 30-day standard payment term under the Late Payment of Commercial Debts (Interest) Act 1998, although contracts and circumstances matter. Configure Odoo terms and escalation rules against the agreed contract, while flagging repeated drift beyond the baseline using UK late-payment guidance.
Print one checklist: reconcile, age, invoice, chase, forecast, approve, review stock, measure, and escalate. The business intelligence guidance for SMEs can help connect those measures to management reporting, but the discipline remains simple: review the numbers every week and assign an action before the next meeting.
ERP Artists helps UK SMEs configure Odoo accounting, receivables, inventory, purchasing, forecasting, integrations, and AI-assisted workflows around their actual cash cycle. If your business is still relying on disconnected spreadsheets or manual invoice chasing, visit ERP Artists to discuss an operational audit and a practical Odoo roadmap for the next 30 days.
