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Repeating invoices for HR retainer clients with Xero

Bill monthly HR retainer clients with repeating invoices and automatic reminders in Xero. Grow from £39 a month excluding VAT.

At a glance

  • What it costs£39 a month

  • Worth, in extra profit or time saved in the worked example£88 a month

  • Pays for itselfIn about two weeks

  • Connecting two tools or some setup timeSome setup needed

Figures come from the worked example below, using its stated assumptions. Tool prices checked . How we check prices

The problem

Employer clients on a monthly retainer each need an invoice raised and chased every month. If you have 25 retainer clients and raising and chasing each takes 10 minutes, that's 250 minutes, 4.2 hours a month.

What the AI does

In Xero you set up each retainer as a repeating invoice that is created on its date, with automated invoice reminders for late payers. Ignite is limited to 20 invoices a month, so 25 clients needs Grow at £39 excluding VAT. This is for your office account only. Client money must be handled through your client account and accounting records as the SRA Accounts Rules require.

A worked example

A small employment firm in Bristol has 25 employer clients on a monthly HR advice retainer. The practice manager sets each up as a repeating invoice in Xero and turns on payment reminders.

Before

10 minutes to raise and chase each of 25 retainer invoices: 4.2 hours a month

After

About 3 minutes per client to check amounts and answer queries: 1.3 hours a month

What it's worth

About 2.9 hours a month saved (7 minutes x 25 clients = 175 minutes), worth around £88 if staff time is worth £30 an hour, against £39 for Grow. That pays back by about £49 a month, before VAT and before counting faster payment. It is only worth it if you do not already have an accounting system.

How to set it up

  1. Check with your COFA that retainer income is office money and how it is recorded.
  2. Start a Xero plan. Ignite at £18 covers up to 20 invoices; check that 20-invoice limit applies per month, and for 25 clients take Grow.
  3. Set up each retainer client as a repeating invoice with its amount and day of the month.
  4. Turn on invoice reminders and check the wording before it goes out.
  5. Review the first month's invoices against your engagement letters.

What goes wrong

  • Ignite is limited to 20 invoices and 10 bills a month, so this firm needs Grow. Check the limits before you pick a plan.
  • Xero is not a legal accounting system for client money. Keep that in your SRA-compliant client account system.
  • Prices exclude VAT, and a promotional discount for new customers does not last.
  • A repeating invoice keeps billing after the retainer ends. Cancel it when the engagement does.

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Last updated 17 October 2026.