Key takeaways
What this article covers, in order:
- The monthly invoicing chore nobody misses
- Which retainer models are common?
- Setting up a recurring invoice: what to decide
- The prepaid retainer: money in, income later
- The hours bank: same idea, different trigger
- Matching retainer payments in the bank
Recurring invoices are templates that create the same invoice on a schedule, so you stop re-typing monthly bills. A retainer is the agreement behind it: the client pays a set amount each period for ongoing work or access to your time. Setting them up properly saves hours, but prepaid retainers need one extra bookkeeping step, because money received in advance isn't income until you've done the work.
The monthly invoicing chore nobody misses
Marcus runs an IT support business in Darwin. Eleven of his clients pay a flat monthly fee for support and monitoring. For years he created those eleven invoices by hand on the first of each month, usually late on the first, often on the third.
Every month, at least one went out with last month's date, or the wrong amount after a price change, or not at all. One client went three months without being billed because their invoice had been accidentally deleted. Nobody noticed until Marcus did his year-end with his accountant.
Recurring invoices fix this kind of problem. But they're only as good as the setup behind them.
Which retainer models are common?
| Model | How it works | Suits | Bookkeeping note |
|---|---|---|---|
| Fixed monthly fee, billed in arrears | Invoice at the end of each month for that month's service | Ongoing support, maintenance, cleaning | Simple: income recognised when invoiced |
| Fixed monthly fee, billed in advance | Invoice on the 1st for the coming month | Subscriptions, managed services | Income belongs to the month of service |
| Prepaid block (quarter or year upfront) | Client pays several months at once | Clients who want a discount for paying upfront | Hold as income in advance, release monthly |
| Hours bank | Client buys a block of hours, you draw it down | Consultants, designers, developers | Release income as hours are used |
| Minimum plus extras | Base retainer each month, extra work invoiced separately | Agencies, bookkeepers | Recurring invoice for base, one-off invoices for the rest |
Pick the model before you set up the invoice. Changing it halfway through confuses clients and your books.
Setting up a recurring invoice: what to decide
Most recurring invoice tools ask for the same things. Get these right once and the invoices look after themselves.
- [ ] Client and contact: the accounts email, not just the person who signed
- [ ] Start date: the first invoice date
- [ ] Frequency: weekly, fortnightly, monthly, quarterly or yearly
- [ ] End date or number of invoices: if the agreement has a term
- [ ] Payment terms: 7 or 14 days is common for retainers
- [ ] Description: include the period, e.g. "IT support and monitoring, Nov 2026"
- [ ] GST: code it correctly; your BAS agent or accountant handles lodgement
- [ ] Draft or send: whether invoices go straight out or wait for a quick check
If you're unsure, start with draft mode for a couple of months. Once you trust the output, switch to sending.
The prepaid retainer: money in, income later
This is where many small businesses get the books wrong.
In Oct 2026, one of Marcus's clients pays $6,000 upfront for three months of support, covering Oct 2026, Nov 2026 and Dec 2026. (Figures below exclude GST to keep it simple.)
It's tempting to record $6,000 as income in Oct 2026. But Marcus hasn't earned it yet. If the client cancelled on 1 Nov 2026, he'd owe two months back. Until he does the work, that money is a liability: income received in advance.
Here's how it unwinds:
| Month | Opening balance, income in advance | Received | Recognised as income | Closing balance |
|---|---|---|---|---|
| Oct 2026 | $0 | $6,000 | $2,000 | $4,000 |
| Nov 2026 | $4,000 | $0 | $2,000 | $2,000 |
| Dec 2026 | $2,000 | $0 | $2,000 | $0 |
| Total | $6,000 | $6,000 |
Each month, a journal moves $2,000 from the liability account to income. By the end of Dec 2026, all $6,000 is income and the liability is back to zero.
If you keep your books on a cash basis, you might simply record the $6,000 when it arrives. That's simpler, but your monthly profit will jump in Oct 2026 and look thin in the following two months. Talk to your accountant about which approach suits your business.
The hours bank: same idea, different trigger
Another of Marcus's clients buys a 20-hour bank for $3,000 ($150 an hour). Instead of releasing the income evenly, he releases it as he uses the hours.
| Month | Hours used | Income recognised | Hours left | Balance held in advance |
|---|---|---|---|---|
| Oct 2026 | 6 | $900 | 14 | $2,100 |
| Nov 2026 | 9 | $1,350 | 5 | $750 |
| Dec 2026 | 5 | $750 | 0 | $0 |
| Total | 20 | $3,000 |
Keep a simple timesheet against each hours bank and send the client a running total each month. It heads off disputes and usually prompts them to buy the next block before the current one runs out.
Matching retainer payments in the bank
Recurring invoices create a predictable stream of deposits, which should make reconciliation easy. Watch for these:
- Clients who pay a different amount from the invoice, usually after a price rise they didn't update in their own system. Short payments on recurring invoices compound quickly.
- Clients who pay two months at once. Allocate to the oldest invoice first.
- Direct deposits with no reference. With eleven clients on the same fee, a missing reference makes it hard to tell who paid. Ask each client to include the invoice number.
- Cancelled clients still being invoiced. Stop the recurring schedule the day a client gives notice.
Price changes without the mess
When you raise retainer prices, give clients written notice (30 days is courteous), update each recurring invoice template on the same day, and add a line to the first new invoice mentioning the change. Then check the first round of payments. You'll find the clients who didn't update their records.
How HelloBooks helps
Recurring invoices are on HelloBooks Pro (A$30/month), alongside AI auto-categorisation, unlimited bank connections and AI Analysis on every report. Invoices, quotes, unlimited email payment reminders and AR ageing are on the Free plan (A$0, no card, no expiry), so you can start with one-off invoices and move to Pro when the repeat billing becomes a chore.
When retainer payments arrive through your connected bank account or a CSV statement import, the reconcile screen suggests a match for each line with a confidence score and the reason for it. See recurring invoices and pricing.
FAQs
What's the difference between a retainer and a recurring invoice?
A retainer is the agreement with your client. A recurring invoice is the billing tool that charges for it on a schedule. You can have a retainer billed manually, but a recurring invoice saves the effort.
Is a prepaid retainer income when I receive it?
Under accrual bookkeeping, no. It's income received in advance (a liability) until you deliver the service. You release it to income as the work is done. Cash-basis bookkeepers often record it when received; your accountant can confirm which approach suits you.
Should recurring invoices be sent automatically?
Once you trust the setup, yes. For the first couple of cycles, or after any price change, reviewing them as drafts first is a good habit.
How do I handle a client who cancels mid-retainer?
Stop the recurring invoice straight away. If they've prepaid, work out how much is unearned and either refund it or issue a credit note, depending on your agreement.
Can I put a retainer on 14-day terms?
Yes, and many businesses use shorter terms for retainers because the service is ongoing. Some bill in advance on 7-day terms so payment arrives before the month's work starts.
Set it up once, check it monthly, and let the invoices take care of themselves.
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