Accounts receivable automation for UK businesses
Stop chasing invoices manually and watching DSO drift. We build the AR automation layer that gets you paid on time, every time — and gives finance a live view of the cash you're owed.
Your DSO is drifting and nobody's noticed.
Most UK SMEs send invoices on time. Then nothing happens. The AR team is too busy to chase consistently. Days Sales Outstanding drifts from 32 to 58. Working capital tightens. By the time someone notices, £40k+ of cash is locked up in invoices that should have been paid weeks ago.
- Inconsistent chasing — Some customers get chased at day 7. Some at day 35. Some never. The pattern depends on who in the AR team is in that week — not the company's credit policy.
- Manual payment matching — Bank statement lines arrive without invoice references. Someone in finance plays detective every morning, matching customer payments to open invoices. Mistakes mean false-positive chase emails to customers who've already paid.
- No live AR visibility — The finance director asks "who owes us money?" Someone spends 90 minutes pulling an aged debtors report from Xero, then explaining why three figures don't reconcile. The conversation happens once a week.
Get paid on time, every time, without nagging.
AR automation isn't aggressive collections. It's consistency — every customer gets the same chasing cadence regardless of how busy the AR team is. Done well, customers stop hating your chasing because it's predictable, polite and easy to action.
- Independent — no payment platform commissions — We have no financial relationship with Chaser, Satago, Upflow, GoCardless, Stripe or any of the ledger vendors. The recommendation is whatever fits your stack and customer mix.
- Customer-respecting — Chasing cadences are tuned to your customer relationships — gentler with strategic customers, firmer with serial late-payers. Disputes route to a human before any escalation. No automation triggers on a customer in active dispute.
- Built to be extended — Every cadence, every threshold, every escalation rule sits in a config your finance team can change without calling us. We don't lock you into our build.
Seven workflows we ship in every project.
These are the stages of a complete AR pipeline. Most projects build five or six of them; the rest get scoped for phase two.
A four-phase engagement, priced flat
No hourly billing. No scope creep. You know what you're paying and what you're getting before we start.
We sit with your AR team for a full chasing cycle. We measure DSO, payment-match throughput, dispute volume, customer chase responsiveness. Output: a map of your current AR flow and the cost-saved estimate of automating each stage.
We pick the highest-ROI stages first — usually chasing cadence and payment matching, because those compound on every invoice. You see the build cost and the DSO impact estimate for each before signing off.
We build in Make, n8n or Zapier plus direct ledger and payment-platform API integrations. Your AR lead pair-builds with us. We run shadow processing alongside live AR for at least two weeks before switchover so the team trusts every chase email and every payment match.
Full documentation. Training on adjusting chasing cadences and credit thresholds. A 90-day review measuring DSO and AR team time before and after. After that, fractional CAO retainer or done.
What accounts receivable automation actually means
AR automation for a UK SME means removing manual handling from the customer-invoice lifecycle — from invoice generation through delivery, chasing, payment, matching, reconciliation and reporting. The goal isn't to remove the AR team. It's to remove the parts of AR work that humans are bad at (consistency on a cadence over months) and let the team spend its time on the parts humans are good at (judgement calls, disputes, customer relationships, credit decisions).
The single biggest commercial lever is DSO reduction. Days Sales Outstanding — the average days between issuing an invoice and getting paid — is the cleanest measure of how well your AR function is working. Across the UK SMEs we've worked with, automation typically reduces DSO by 10–25 days within 90 days of go-live. For a £3m-revenue business, that converts roughly £80k–£200k of working capital from "owed" to "in the bank."
Why AR is one of the highest-ROI places to automate
Three characteristics make AR uniquely worth getting right:
- The work is repetitive and predictable. Every overdue invoice needs the same cadence of polite-then-firm follow-up. That's exactly what automation is good at.
- The pay-off is direct cash. Unlike most automation projects where the benefit is labour saving, AR automation moves money into the bank account.
- The AR team always has too many other priorities. Month-end. Customer queries. Disputes. Reporting. Chasing slips. Automation makes chasing the one thing that doesn't slip.
The four stages of the AR pipeline
Stage 1: Invoice generation
Every automation starts here, because if invoicing is late, everything downstream is late. The triggers vary by business model:
- Project / agency businesses. A signed quote or a milestone-completion event in the CRM (HubSpot, Pipedrive) generates the invoice. Time-and-materials engagements pull billable hours from Harvest, Toggl, Float or your PM tool.
- Subscription / SaaS businesses. Recurring contracts in HubSpot, Salesforce or a billing platform generate invoices on the contract anniversary. Usage components pull from your product database.
- Professional services. Engagement letters or signed proposals trigger invoice schedules — fixed-fee, retainer, success-fee or hybrid. Each split has its own trigger.
- Ecommerce / B2B wholesale. Shopify, BigCommerce, Brightpearl or a custom order management system feeds invoices on fulfilment. POs from buyers like Ocado, Sainsbury's or Amazon Vendor get matched at this stage.
The failure mode here is invoices that are technically due but haven't been generated because someone forgot. Automation closes this leak completely.
Stage 2: Invoice delivery
Most UK SMEs send by email and consider the job done. For larger customers — especially supermarkets, government, large corporates — that's not enough. Many require submission via supplier portals (Coupa, SAP Ariba, Tradeshift, Basware) or EDI. We automate portal submission where the customer requires it, then track confirmation. "We didn't receive your invoice" stops being an excuse.
For email delivery we use the same domain authentication setup as transactional email: SPF, DKIM, DMARC properly configured. Deliverability of your invoice emails directly affects how often you have to resend them.
Stage 3: Chasing cadence
This is the highest-leverage stage. The pattern we use most often:
- Day 0 (issue): invoice sent with payment terms, payment link (Stripe / GoCardless / Pay by Bank), and customer reference.
- Day -2 (pre-due): gentle reminder. "Just a heads-up your invoice is due Friday."
- Day +1 (overdue): polite first chase with statement attached.
- Day +14: firmer chase, account-owner cc'd.
- Day +28: escalation, credit controller takes over, repayment plan offered.
- Day +45+: final notice, service suspension trigger (where applicable), debt-collection routing decision.
Every step pauses if the customer responds. Disputes pause everything. Strategic customers can have softer cadences. Serial late-payers can have firmer ones. The credit controller only sees exceptions, not every invoice.
Stage 4: Payment matching and reconciliation
The least visible but most error-prone stage. A customer pays. The bank statement line reads "FPO 0987654 ACME LIMITED." The AR team plays detective: which invoice does that belong to? Was it a partial payment? Did they pay multiple invoices in one transfer?
Good AR automation matches incoming payments to invoices automatically using customer name, amount, reference and (where structured) the invoice number itself. Partial payments allocate correctly. Stripe and GoCardless settlements match invoice-by-invoice via webhook. Unmatched receipts route to a small manual queue rather than blocking the whole reconciliation.
The knock-on benefit is that the chasing engine knows which invoices have already been paid — so customers don't get chased for invoices they've already settled. The single fastest way to lose customer trust is chasing them for money they've sent.
UK-specific design considerations
- VAT treatment. Standard 20%, reduced 5%, zero-rated, exempt. International services to EU customers post-Brexit get reverse-charge handling. Cash accounting scheme businesses need different treatment than accrual.
- Payment methods. UK customers expect Faster Payments by default; many will use GoCardless direct debit if offered. Pay by Bank (open banking) is increasingly popular for invoices over £1,000. Stripe is standard for cards. International customers expect Wise, Stripe or PayPal. Cheques still exist for a small number of older customers.
- Credit insurance. If you use Allianz Trade (formerly Euler Hermes), Atradius, Coface or Hokodo, the AR automation should respect insured credit limits. Approaching limits should flag before invoicing, not after.
- Late payment legislation. The Late Payment of Commercial Debts (Interest) Act 1998 lets you charge statutory interest and £40–£100 compensation per overdue invoice. Some clients invoke this in their day-45 chase; others never do. Automations should make it a toggle.
- Sector-specific terms. Government and large-corporate buyers often impose 60–90 day payment terms regardless of your standard. Automations should differentiate cadence by customer terms, not assume 30 days.
Pricing and engagement options
A focused AR automation build — auto-chasing, payment matching and dashboard — is £4k–£8k fixed. A broader engagement that includes quote-to-invoice generation, recurring billing, customer payment portals and credit-limit management runs £8k–£15k fixed.
The £1,500 Discovery Sprint is the right entry point if you want a paid scoping exercise before committing. We measure your current DSO, model the impact of automation on each stage, and give you a costed build plan with an estimated working-capital release. Some clients take the plan in-house; most use it as foot-in-the-door to a full build.
Fractional CAO retainer for ongoing optimisation is £5k–£15k per month, typically 2–3 days a month of senior automation work. No hourly billing. No commissions.
When AR automation is the wrong answer
- Under ~30 invoices a month. The labour saving rarely covers the build cost. Discipline + a basic chasing schedule beats £8k of automation.
- Customers who pay early. If your DSO is already under 25 days, there's no lever to pull.
- Heavily disputed invoicing. If your invoices regularly get disputed because of unclear pricing, scope or delivery, fix the upstream process before automating the chasing. We'll spot this in Discovery and tell you.
- You actually need credit insurance, not automation. Some businesses are bleeding cash because of credit risk, not chasing inefficiency. We'll route you to a credit insurance broker.
How this fits with the wider Watermelon model
This is one of four dedicated finance automation pages. The parent hub is /automations/finance. Siblings: invoice automation, payroll automation, accounting automation. If you're an accountancy practice running AR for clients, see /industries/accounting-firms. If you're a marketing or creative agency where the bottleneck is project-to-billing rather than AR, see /industries/agencies. To estimate ROI before talking to anyone, the automation ROI calculator is the right starting point.
Ready to release the working capital?
If any of the symptoms in the "Where AR teams leak cash" section made you wince, the free 30-minute call is the right next step. Bring your current DSO. We'll tell you what we'd automate first and what we'd expect it to release.
Release the working capital
30 minutes. No deck. Bring your current DSO. We'll tell you what we'd automate first and what we'd expect it to release.