Bookkeeper Invoice Template & Guide: Retainers, Hourly, and Extras

Bookkeeping and accounting are recurring-revenue businesses. Most of your income comes from the same clients every month, on a retainer or fixed fee, with the occasional extra job like a year-end return or a catch-up cleanup. That makes clean, consistent invoicing part of the professionalism clients are paying for. A bookkeeper whose own invoices are clear, itemised, and sent like clockwork signals they will handle the client's books the same way. A messy invoice sends the opposite message.

This guide covers how to invoice as a bookkeeper or accountant: hourly versus monthly retainer versus fixed-fee packages, billing extra work, recurring clients, and a sample bookkeeper invoice you can copy. It works for solo bookkeepers, accountants, and small practices.

What a bookkeeper invoice must include

A bookkeeping invoice needs the standard fields plus a few specific to recurring professional work:

• Your name or practice name, contact, and any professional or tax number
• The client's name and business
• A unique invoice number, issue date, and a clear due date
• The period or service being billed (the month, or the specific job)
• The service: retainer, hours, or fixed-fee package
• Any extra work beyond the retainer, itemised separately
• Subtotal, tax if registered, and the total due

Naming the period and the service keeps a recurring invoice clear, especially for clients who see one from you every month. For the full anatomy of an invoice, see our invoice format and layout guide.

How bookkeepers charge

Bookkeepers and accountants price work three main ways, and the invoice should match what you agreed:

Model	How it works	Best for
Hourly	Bill tracked hours at a set rate	Variable or one-off work
Monthly retainer	Fixed monthly fee for agreed scope	Ongoing bookkeeping clients
Fixed-fee package	Set price per service (return, payroll)	Well-defined deliverables

Monthly retainers are the goal, because they give both sides predictable income and cost. A retainer names the scope ("monthly bookkeeping, bank reconciliation, and quarterly VAT return") so everyone knows what is included. Value-based fixed fees are increasingly common in the profession too, replacing the hourly model for defined jobs. Whatever you use, state it clearly so the client is never surprised, the same discipline covered in our consultant invoice guide.

Sample bookkeeper invoice

Here is a monthly retainer invoice with an extra job billed separately.

Description	Qty	Rate	Amount
Monthly bookkeeping retainer (June)	1	$450.00	$450.00
Bank & credit card reconciliation	1	included	$0.00
Extra: prior-year catch-up (3 months)	6	$55.00	$330.00
Payroll run (5 employees)	1	$75.00	$75.00
Subtotal			$855.00
Tax			$0.00
Total due (Net 14)			$855.00

The retainer, what it includes, and the extra work all sit on their own lines. The client sees exactly what the fixed fee covers and what the extra charges are for, which is what keeps a recurring invoice approved without a query and protects your retainer scope.

Retainers and billing extra work

The key to a healthy bookkeeping practice is a clear line between what the retainer covers and what is extra. Common extras that should be billed on top:

• Year-end accounts and tax returns, often a fixed fee of their own.
• Catch-up or cleanup work when a new client arrives with months of unreconciled books.
• Payroll runs, if not in the base retainer.
• Ad-hoc advisory or extra reporting beyond the agreed scope.

Bill these as separate, clearly labelled lines so the client understands the retainer has not increased, they simply asked for more. It helps to define the retainer scope in a short engagement letter at the start, so that when extra work comes up you can point to what was agreed and bill the rest without friction. Absorbing extra work into the retainer is the fastest way to make a bookkeeping client unprofitable, a common theme in our common invoice mistakes guide.

Recurring clients and getting paid

Because most bookkeeping income is recurring, make the monthly invoice effortless to pay:

• Invoice on the same day each month, so it becomes predictable for the client's own cash flow.
• Invoice the retainer in advance (start of the month), since you are providing an ongoing service.
• Offer direct debit or a saved card where possible, so recurring fees collect automatically and you are not chasing payment.
• Keep terms short (Net 7 or Net 14) for retainers, since the relationship is ongoing and trust is established.

Predictable billing is the whole point of building a practice rather than trading hours. For terms and chasing the occasional late payer, see our payment terms guide, and for the freelance-style client mix our freelance invoice template guide.

Tax for bookkeepers and accountants

You advise clients on tax, so your own invoices should be textbook:

• In the UK, charge VAT (20 percent) once VAT registered, and show your VAT number on every invoice.
• In Australia, register for GST (10 percent) at A$75,000 turnover and quote your ABN on each invoice.
• In the USA, bookkeepers report income themselves; sales tax on services varies by state.

Show tax as a separate line and only charge what you are registered to collect. As a finance professional, a clean compliant invoice is also a quiet advert for your own competence. For clients abroad, see our how to invoice international clients guide.

Common bookkeeper invoice mistakes

• Absorbing extra work into the retainer instead of billing it.
• Vague retainer scope, inviting scope creep.
• Inconsistent invoice dates, so recurring billing slips.
• Not using automatic collection, so you chase your own money.
• Sending editable files. Always send a PDF.

Make a bookkeeper invoice in 60 seconds

You do not need practice software to invoice cleanly. Invoicara's free invoice generator lets you itemise the retainer, add extra jobs on separate lines, apply tax, set Net 14 terms, and export a clean PDF. Save each client's details so their monthly invoice takes under a minute. No sign-up, no watermark, free forever.

For related professional services, see our consultant invoice guide and virtual assistant invoice guide. For the basics, our complete guide on how to make an invoice covers every field. Bill the retainer clearly, itemise extra work, invoice on a schedule, and your bookkeeping practice gets paid on time by every client.