Recurring invoices for retainers: how to set them up

A recurring invoice is an invoice you set up once to go out on a schedule, usually monthly, so you never re-bill the same client by hand. For a retainer it fixes the most common cause of late payment: the gap between the end of a month and you remembering to send the bill.

Why retainers need recurring billing

A retainer exists to make income predictable. The client pays a set amount each period for ongoing work. That predictability breaks when billing depends on you sending an invoice on the first of every month. Miss it by a week and the payment slips a week, every cycle. A recurring invoice removes the human step so the bill goes out on the same date.

The wider problem is well documented. Intuit QuickBooks' late payments survey found that 56% of small businesses were owed money from unpaid invoices, averaging $17,500 each, and that 47% had some invoices more than 30 days overdue. Xero's guide on late payment reports that US small businesses were paid an average of 9 days late in the first quarter of 2026. A bill that nobody has to remember to send cannot be late for that reason. If you still bill hourly, our case for retainer pricing over hourly explains why the move pays off.

How to set up a recurring invoice

The setup is quick in any decent invoicing tool.

1. Create the invoice once, with the fixed retainer amount and line items.
2. Choose the frequency, usually monthly, then the start date and any end date.
3. Turn on automatic sending, and send it a few days before the due date rather than on it, so the client has notice.
4. Use the same clear payment terms every cycle.
5. Send a receipt when the payment lands, so both sides have a record.

Once it runs, the retainer client is billed with no monthly effort from you. Check the first two invoices yourself before you trust the schedule: look at the date, the number, the amount and the payment link.

Get the client's authorization right

If the charge runs automatically each cycle, the client has to agree to that once, in writing, and you should keep the record. Spell out the amount, the frequency, the start date and how either side can pause or cancel, ideally in the same contract that defines the retainer. Our guide to writing a retainer agreement covers that wording.

For bank debits, the rules are stricter. Law firm summaries of the Nacha rules, such as DLA Piper's overview, describe written or similarly authenticated consent for consumer debits, and recurring entries run at a regular interval without further action by the payer. Terms vary by region and by processor, so confirm what your gateway requires.

A charge the client forgot they authorised is the fastest route to a dispute, and disputes cost money. Chargebacks911's statistics report that merchants recover only a net 10.7% of contested card payments. Clear, documented consent is what keeps an automatic charge from turning into a chargeback.

Build in a light change process as well. Retainers evolve: scope grows and rates rise. Make it easy to adjust the recurring amount with notice instead of cancelling and rebuilding. Give at least one full cycle's notice of any increase, in writing, so a higher invoice is never a surprise.

Choose the cheapest rail for a repeating charge

On a monthly retainer the payment method decides how much you lose to fees across a year. Card fees are an uncapped percentage. A $3,000 monthly retainer at a 2.9% card fee costs about $87 a month, which is over $1,000 a year. Bank transfers are usually capped. Square's fee page lists ACH transfers at 1% with a $10 cap on its paid plans, so the same retainer costs at most $10 a month.

Rates differ by provider and country, and some gateways have no bank option in your market. Check your own gateway's current rates. The principle is stable: for recurring retainers, offer bank transfer where it exists, and keep cards for smaller or one-off charges where convenience is worth the percentage.

Mistakes that make recurring billing go wrong

• No end or review date. A retainer that runs for two years on the original price quietly becomes a discount. Put a review date in your calendar for every renewal.
• Vague line items. "Monthly services" invites questions. Name the scope and the period, for example "Social media management, March, up to 12 posts".
• Tax details missing. If you charge VAT or sales tax, the recurring template needs your registration number and the rate, and it must change when the rules change. Check the details with your accountant.
• Billing in arrears by habit. Billing at the start of the month protects your cash flow and tells the client they are buying reserved time.
• No pause rule. Clients go on holiday and projects pause. Decide in the contract whether a paused month is billed, discounted or skipped, so the schedule never runs against an agreement you forgot.

What to do when a recurring payment fails

A recurring bill is only as reliable as the payment behind it. Cards expire and bank details change, so some invoices will go unpaid even when the client intended to pay.

• Make sure you are alerted to an unpaid invoice, not only the client.
• Follow up inside a few days. A quiet failure can let a whole month slip.
• Keep a short, friendly message ready: "The payment on this month's invoice did not go through. Here is the link to try again."
• Use reminders on a schedule instead of chasing by hand. Our guide to handling late-paying clients has the wording.

Keep the relationship, not just the billing

Automating the invoice does not mean automating the relationship. A retainer client who is billed on time but hears from you only when something breaks will start to question the value. Send a short summary of what you did each month beside the invoice, so the payment always lands next to visible work. The recurring invoice handles the money. A monthly update handles the renewal.

How Delivvo runs the monthly retainer bill

Delivvo is built so the retainer agreement, the invoice and the payment sit in one place.

1. Send the quote and contract from one link. The client signs by typing or drawing a signature, and you get a signing record plus an archived PDF.
2. Set up the monthly fee as a recurring invoice. Each one is numbered in your own format and can carry a Tax Invoice title, your tax details and your branding.
3. The client pays through your own processor, such as Stripe, PayPal or Square. Delivvo takes 0% and is never the merchant of record.
4. If an invoice goes unpaid, automatic reminders go out at 7, 14 and 30 days and stop once it is paid.
5. The client opens a portal with a one-time code and sees invoices, files, approvals and messages in one place, so your monthly update has somewhere to live.
6. If you owe a credit, you can issue a credit note, and a void keeps the numbering clean.

Retainer clients often include a finance team that wants to confirm a document is real. Every invoice and receipt carries a verification code that anyone can check at delivvo.io/verify, which shows the issuer, number, dates, amount and status. Delivvo does not move your money, so the gateway you already use sets the payment method and the fee. You can read more on the recurring invoices page and the invoicing page, or try the free invoice generator.

Read more about how payments work, or start with the CRM and client portal.

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