An agency can make sure retainers are paid before payroll by counting back from payday and setting each retainer's due date or collection date early enough for the slowest payment method to land. Direct debit gives you the most control, because you choose the date and the client doesn't have to remember. Leave a few working days of buffer, and more in months with a bank holiday near payday.
In this article
The short version
- Count back from payday, one payment method at a time.
- Bank holidays near month end can take two working days out of the window.
- Direct debit lets you set the collection date, so a client's payment run doesn't decide it.
- A due date around the middle of the month leaves room for reminders.
- Chase a week or two before payroll, not during it.
Work back from payday
Payroll comes with fixed dates of its own. You report pay to HMRC on or before payday, and the PAYE you've deducted is due by the 22nd after each tax month ends (the 19th if you pay by post). You need the retainer money in your account before those dates, so start at payday and count backwards, one payment method at a time.
Say your payday is Wednesday 31 March 2027 and you'd like the retainer money in the bank by Tuesday 30 March, the working day before. Easter falls late that year, with Good Friday on 26 March and Easter Monday on 29 March, so two working days vanish just before payday. Using the payout times for payments taken through Adfin, the latest safe dates are:
- Thursday 18 March: last day for a direct debit client to be notified of the collection, three working days before the latest collection date.
- Tuesday 23 March: last collection date for a direct debit, paid out within three working days.
- Wednesday 24 March: last day for a card payment or bank transfer, both paid out two working days later.
- Tuesday 30 March: last day for pay by bank, which you receive the same working day.
A card payment made on Thursday 25 March looks comfortable with a week to go. With the Easter break it pays out on Wednesday 31 March, payday itself, and leaves you no margin at all. Check the bank holidays each month before you run the same count for your own payday.
Where the days go
The payment system isn't normally the slow part. A Faster Payment sent straight to your business account usually arrives almost immediately, though it can take up to two hours, or longer outside working hours. The wait tends to come before your client presses the button.
Larger clients often pay suppliers on a weekly or monthly payment run, and a retainer invoice that arrives just after one run can sit until the next. Big transfers can also run into the client's own bank limits or an extra security check, so it's worth asking a new client how they usually pay a large monthly sum.
Direct debit works the other way round. Bacs runs a three-day cycle, from the instruction on day one to the money moving on day three. It isn't instant, but you set the date and your client's payment run has no say in it.
Weekends and bank holidays in England and Wales, which set the payment processing days, affect every method. Easter in some years, and the late May and August bank holidays, fall near the end of the month, so you'll want earlier due dates in those months.
Set retainer dates around your payroll
Many agencies invoice retainers on the 1st, and the date that counts for payroll is the due date. It needs to sit early enough that your slowest-paying client still lands before payday, with room for a reminder or two. For a payday at the end of the month, a due date around the middle of the month usually gives you that room.
With Adfin, each direct debit is taken for that month's invoice amount on its due date, so one mandate covers a retainer whose amount changes. Your client hears about each collection at least three working days beforehand. If a collection fails, it's retried free, and you can switch on trying a saved card or sending a payment link. Clients who'd prefer to pay by card can keep one on file instead. It's charged automatically for each new invoice, and they're told one business day before. Direct debits over £2,000 carry an extra charge, which is worth knowing if a retainer runs above that.
When a retainer is late in payroll week
Reminders tend to work better a week or two before payroll than during it. A nudge shortly before the due date, with the amount and a way to pay, gives the client time to fit it into their next payment run. On the Essential plan, reminders by email, SMS and WhatsApp are free under fair use. Enhanced, at 0.3% per paid invoice, adds Adfin's collection agents, which adjust timing, channel and tone within rules you approve.
If a payment still hasn't arrived in payroll week, ask the client for a date and send a payment link they can pay by bank, so the money arrives the same working day.
A reserve helps too. If you can build up enough to cover one payroll, a single late retainer is far less likely to affect whether your team is paid on the day.
Common questions
How many days before payroll should retainer invoices be due? Enough for your slowest payment method to land, plus a buffer for reminders. For a payday at the end of the month, a due date around the middle of the month usually works.
How long does a direct debit take to reach my bank account? Bacs runs a three-day cycle, with the instruction going in on day one and the client debited on day three. Through Adfin, the money is paid out within three working days of the collection date.
Is direct debit or card better for monthly retainers? Direct debit lets you choose the collection date, which makes planning around payroll easier. A card on file also collects automatically, with the client told one business day before each charge.
Why has a client's bank transfer not arrived yet? Faster Payments normally arrive within two hours of being sent, so a missing transfer often hasn't been sent. A client's payment run, an approval step or a bank check on a large payment are common causes.
What should I do if a retainer client pays late in payroll week? Ask for a payment date and send a link they can pay by bank, which arrives the same working day. Then suggest an earlier due date for the following months.
Can I change a retainer client's payment date to suit my payroll? You can ask, and it's easiest to raise at a renewal. Confirm the new date in writing so the next invoice matches it.
Sources
- HM Revenue & Customs - Running payroll: reporting to HMRC (accurate as of October 2026) https://www.gov.uk/running-payroll/reporting-to-hmrc
- Pay.UK - How Faster Payments work (accurate as of October 2026) https://www.wearepay.uk/what-we-do/payment-systems/faster-payment-system/how-faster-payments-work/
- Pay.UK - Faster Payment System (accurate as of October 2026) https://www.wearepay.uk/what-we-do/payment-systems/faster-payment-system/
- Bacs - Direct Debit (accurate as of October 2026) https://www.bacs.co.uk/bacs-schemes/getting-started/direct-debit/
