Under 15 staff, credit control sits with the founder or an office administrator, and what breaks is consistency: invoices go out late, chasing depends on who has time, and nobody knows who's allowed to put a client on hold. From about 15 to 50 staff a finance manager takes over, and the problems become volume, larger clients' paperwork and reporting. Past 50, often across several entities after acquisitions, you need one group policy, one view of the ledger and a clean history a buyer or lender can trust.
In this article
The short version
- Most UK MSPs are small, with 65% micro businesses and another 24% small in a 2025 government market study.
- Under 15 staff, fix consistency with written terms, direct debit for managed services and a one-page credit control policy that says who can pause service.
- From 15 to 50 staff, a finance manager faces volume and larger clients' purchase order rules, so segment clients and capture accounts payable details at onboarding.
- Past 50 staff and across several entities, you need one group policy, one payments and collections layer and twelve months of reconciled month-end ledgers.
- At every size the routine work of reminders, follow-ups, retries and statements grows with each client, and the rules come from whoever owns credit control.
Under 15 staff: founder and office administrator
Most UK MSPs are this size. Of those with a recorded size in a 2025 government market study, 65% were micro businesses and another 24% small. The staff bands below are rough markers: a 12-person MSP with three enterprise clients can hit finance-manager problems early.
Up to about five staff, you as founder sell, fix and invoice, and credit control happens when there's a gap in the week. Typical problems:
- The monthly invoice run slips in a busy week, and every day it slips is a day later you get paid.
- You chase when a client's name comes up on a ticket, and you stop chasing the friendly ones altogether.
- You buy laptops on your own account and wait 30 days or more for the client to pay.
Somewhere between five and 15 staff, an office administrator takes it on alongside orders and the phones, with less authority than you had. They can send reminders but don't know if they can say "new work is on hold", so long-standing clients go unchased. A reply saying "we've only got 18 users, not 22" goes to a technician and sits there. When the administrator is on holiday, chasing stops.
Fixes at this size:
- Written terms in your master services agreement: 30 days or direct debit for managed services, payment or a deposit on order for hardware and big projects.
- Direct debit for monthly managed services. The amount can change each month under one mandate, with advance notice, which suits per-seat billing.
- A one-page credit control policy you sign off once: when reminders go out, what happens at 14 and 30 days overdue, who can agree a payment plan, who can pause service, and how disputes are logged.
- A dispute log with an owner and a date on every line.
- Reconciliation that matches payments to invoices in Xero or QuickBooks automatically.
15 to 50 staff: a finance manager takes over
By now you might have 60 to 150 clients and a handful with their own accounts payable teams. Typical problems:
- Volume. Personal chasing that worked for 30 clients falls behind at 120.
- Larger clients' processes. Invoices get rejected for a missing purchase order number, or need uploading to a supplier portal nobody told you about.
- Disputes get chased as if they were simply late, which strains the relationship for nothing.
- Project risk. Sales agrees a £40,000 project before anyone checks how the client pays.
- Reporting. "How's cash?" gets answered with a spreadsheet built by hand each time.
Fixes at this size:
- Segment by value and behaviour: a named contact for top clients, automated reminders only for reliable payers, and earlier contact plus direct debit at renewal for repeat late payers.
- An onboarding checklist that captures the accounts payable contact, purchase order rules, any portal and the payment method before the first invoice.
- A deposit rule for projects over a set value, or for any new client with no payment history.
- One short monthly report: DSO calculated the same way each month, the share of the ledger over 60 days, the largest overdue balances, failed direct debits and open disputes.
- A clear line on statutory interest: apply it by default and waive it deliberately, with a record of who's had it waived.
50+ staff and more than one entity
Past 50 staff you probably have a finance director, and if you've grown by acquisition, several entities, each with its own billing, terms, direct debit provider and habits. Typical problems:
- Consistency. One entity chases at 7 days overdue, another at 30, and clients who buy from both notice.
- A single view. The group aged receivables report means stitching together exports from several systems, so you only see it at month-end.
- Duplicated payment and chasing tools, each with its own fees and reconciliation.
- Scrutiny. Buyers and lenders look hard at receivables, and working capital is often measured as an average over the previous 12 months.
Fixes at this size:
- A group credit control policy, with entity exceptions written down and approved by the FD.
- One payments and collections layer across entities, working alongside each entity's accounting system, so every ledger follows the same rules.
- Consolidated direct debit mandates. With Adfin, 10 or more mandates move across through the Bacs bulk change process without customers signing again, and customers are told in writing before the change date. With fewer, customers sign a new Adfin mandate through a self-serve route.
- A board pack by entity and for the group, and twelve months of consistent, reconciled month-end ledgers.
What stays the same at every size
Whoever owns credit control, the routine work stays the same and grows with every client: reminders on time, follow-ups after the due date, retrying failed direct debits and statements when a client goes quiet. Adfin's Customer Agents can take that part on at any stage, chasing each client over email, SMS or WhatsApp on a timing and channel suited to them, adding late fees, offering instalment plans and passing queries to the right person. The rules come from whoever owns credit control in your business, which changes from you to an administrator, then a finance manager, then an FD.
Common questions
When should an MSP hire a finance manager for credit control? Commonly between 15 and 50 staff, often when you pass 60 clients or start billing larger clients with purchase order rules.
What should an MSP credit control policy include? Payment terms by invoice type, when reminders go out, what happens at set points after the due date, who can agree payment plans or pause service, and how disputes are logged. Under 15 staff, one page is enough.
Should small MSPs put every client on direct debit? For monthly managed services, yes where you can, because payment arrives on a known date. Hardware and projects often suit a deposit or card payment.
How should credit control work across several MSP entities? One group policy with written exceptions and a single consolidated view of receivables, so clients who buy from more than one entity get the same terms and the same chasing.
Can I move direct debit mandates between providers after an acquisition? Yes. With Adfin, 10 or more mandates move through the Bacs bulk change process without customers re-signing; with fewer, customers sign a new Adfin mandate.
What do buyers look at in an MSP's receivables? Receivables trends, customer concentration, working capital and how collectable aged balances are, often over the last 12 months.
Sources
- GOV.UK (DSIT) - Research on managed service providers 2025 (accurate as of September 2026) https://www.gov.uk/government/publications/research-on-managed-service-providers-2025
- ICAEW Corporate Finance Faculty and Grant Thornton - Completion mechanisms: determining the final equity value in transactions (accurate as of September 2026) https://icaew.com/-/media/corporate/files/technical/corporate-finance/guidelines/icaew-completion-mechanisms-v2.ashx
- BDO USA - Net working capital is vital in M&A (accurate as of September 2026) https://www.bdo.com/insights/advisory/importance-of-net-working-capital-nwc-in-m-a
- Adfin Help Center - Bulk-migrate your direct debit mandates to Adfin (10+ mandates) (accurate as of September 2026) https://support.adfin.com/en/articles/12688044-how-to-migrate-direct-debit-mandates-to-adfin
- Adfin - Credit control (accurate as of September 2026) https://www.adfin.com/credit-control
