Retainer Invoice Template
A retainer invoice bills a client for an ongoing arrangement rather than a single job: a fixed monthly fee that reserves your time or covers a defined scope, usually paid at the start of each period. Clients approve these invoices quickly when each one answers the same questions: which period the fee covers, what it includes (for example up to 25 hours, or two campaigns), how much of last period's allowance was used, whether unused hours roll over, and what is billed on top, such as overage hours at the agreed rate or expenses at cost. This template keeps the retainer fee on its own line tied to the agreement, and puts overage and expenses on separate lines so the base fee never changes by surprise. It is for consultants, agencies, bookkeepers, designers and other service businesses. Lawyers handle advance fees under trust-account rules, which this invoice does not replace. The download is an editable HTML invoice with invoice number, dates, a line-item table and totals; fill it in your browser and print it or save it as PDF.
Preview this editable document
Download the HTML file to edit its fields, then print or save as PDF. Totals are entered manually.
What This Template Includes
- Retainer agreement reference and start date
- Retainer period this invoice covers
- Retainer type: monthly fee for reserved hours or scope, or prepaid balance drawn down
- What the fee includes: hours or deliverables per period
- Hours or work used in the previous period
- Unused hours: rolled over or expired, per the agreement
- Overage from the previous period, at the agreed rate
- Prepaid balance: opening, applied and remaining, for drawdown retainers
- Expenses billed at cost, outside the retainer
- Billed in advance or in arrears, and the due date
- Notice period for ending or changing the retainer
How to Create Your Retainer Invoice
- 01
Describe your work
Type a plain English description of the services you provided, the client, and the amount.
- 02
AI generates your invoice
InvoiceQuickly's AI drafts the client, line items, dates, and totals for you to review before saving.
- 03
Review, download, and send
Check every detail, download the PDF, or use Pro to email the PDF directly to your client.
Recommended Payment Terms
Most monthly retainers are billed in advance: the invoice is dated the first day of the period and due within a short window, often 7 to 14 days, so the fee is paid before most of the work is done. Overage is billed in arrears on the next invoice, at the rate in the agreement, once you know the hours. Write three things into the agreement and repeat them on every invoice: the allowance (hours or deliverables), what happens to unused hours (rolled over, capped or expired at the end of the period), and the notice needed to end or change the retainer. For a drawdown retainer, where the client pays a lump sum that you bill work against, send a statement with each invoice showing the opening balance, the amount applied and what remains, and agree in advance whether an unused balance is refunded. Late fees apply only where your agreement and local law allow them.
Need help writing payment terms? Read our guide to invoice payment terms for best practices and templates.
Tax Information
A retainer is taxed like the service it pays for; there is no special retainer tax. In the United States, whether your service is subject to sales tax depends on your state and the service, and a business that pays you $2,000 or more for services in 2026 generally reports it on Form 1099-NEC (the threshold was $600 for payments made before 2026), so expect a request for Form W-9. In the United Kingdom, HMRC treats an ongoing service paid regularly as a continuous supply: VAT Notice 700 says there is a tax point each time you issue a VAT invoice or receive a payment, whichever happens first, so a retainer invoice issued on 1 November creates the tax point for that month's fee on that date. InvoiceQuickly applies one tax percentage per invoice and copies saved tax IDs to new invoice PDFs; check the saved IDs and PDF before sending when it must appear. General information, not tax advice.
Industry context (2026)
Two official rules affect retainer invoices beyond the agreement itself. In the UK, HMRC's VAT Notice 700 (section 14.3, page last updated 25 June 2026) says that for services supplied on a continuous basis there is a tax point every time you issue a VAT invoice or receive a payment, whichever happens first, which is why the issue date of an advance retainer invoice decides the VAT period. In the US, the IRS raised the Form 1099-NEC reporting threshold from $600 to $2,000 for payments made after 31 December 2025 (IRS Form 1099-NEC FAQ, last reviewed 16 October 2026), so a $3,000 monthly retainer crosses it with the first payment. For lawyers, ABA Model Rule 1.15 requires legal fees and expenses paid in advance to be deposited in a client trust account and withdrawn only as fees are earned or expenses incurred; each state adopts its own version. No official body publishes retainer rates, so this page gives none. Checked 27 and 28 October 2026; general information, not tax or legal advice.
Worked example
Worked example (illustrative rates, not market data): a US marketing consultant has a retainer agreement dated 1 August 2026 with a software company: $3,000.00 a month for up to 25 hours, billed in advance on the 1st and due in 7 days; overage at $140.00 an hour, billed in arrears; up to 5 unused hours roll over for one month. In October the consultant worked 29.0 hours. Invoice INV-0108, dated 1 November 2026, due 8 November. Line 1: 'November 2026 retainer, up to 25 hours, per agreement of 1 August 2026', 1 × $3,000.00. Line 2: 'October overage: 29.0 hours used of 25 included', 4 hours × $140.00 = $560.00. Line 3: survey tool subscription for the client's research, October, at cost, receipt 7731, 1 × $49.00. Subtotal $3,609.00, tax 0%, total $3,609.00. Notes: 'October usage 29.0 of 25 hours, time log attached. No unused hours to roll over. November allowance: 25 hours.' Compare a quieter month: had the consultant worked 22.0 hours in October, there would be no overage line, 3 unused hours would roll over and the notes would read 'November allowance: 28 hours (25 + 3 rolled over from October)', for a total of $3,049.00. In both cases the $3,000.00 fee line is identical, so the client can approve it at a glance and look only at what changed.
Common mistakes to avoid
Folding overage into the fee
Raising the retainer line from $3,000 to $3,560 hides the overage and invites a query. Keep the fee constant and bill overage on its own line.
No usage report
An invoice that never mentions hours used leaves the client guessing whether the retainer is worth it. Report usage every period.
Unwritten rollover rules
If the agreement does not say what happens to unused hours, the client will assume they roll over indefinitely. Put the rule in writing and apply it on the invoice.
Treating a drawdown balance as earned
Money paid in advance and drawn down against future work is not all earned on receipt. Track the balance and show what was applied and what remains.
Using a business retainer invoice for legal advance fees
Lawyers' advance fees are governed by trust-account rules. Use the firm's trust procedures, and bill earned fees on a legal invoice.
Invoicing Tips
- 1Name the period in the first line ('November 2026 retainer, up to 25 hours, per agreement of 1 August 2026'). A finance team checks it against the agreement and the previous month.
- 2Report last period's usage on every invoice ('October: 29.0 of 25 hours'), even when there is no overage. It shows the client what the fee is buying.
- 3Bill overage on its own line in arrears at the agreed rate, and attach or offer the time log.
- 4Apply the rollover rule exactly as written. If unused hours expire, say so on the invoice; if they roll over, show the new allowance.
- 5Keep expenses outside the retainer fee and bill them at cost with a receipt reference, unless the agreement includes them.
- 6Review the fee against actual hours every quarter. Months of overage mean the allowance is too small; months of unused hours mean the client will question the value.
Related Resources
- All invoice templates
- Invoicing retainer agreements: prepaid, postpaid and capped retainer models
- Invoicing for consultants
- Invoicing for agencies
Frequently Asked Questions
What is a retainer invoice?
A retainer invoice bills a client for an ongoing arrangement, typically a fixed fee each month that reserves your time or covers a defined scope, rather than for a single finished job. It names the period, what the fee includes and any extras such as overage hours or expenses.
What should a retainer invoice include?
Your details and the client's, the invoice number, issue and due dates, the agreement reference, the period covered, the retainer fee and what it includes, hours used last period and any rollover, overage at the agreed rate, expenses at cost, tax if you charge it, the total and how to pay.
Do you invoice a retainer before or after the work?
Usually before: the fixed fee is invoiced at the start of each period, and anything above the allowance is billed in arrears on the next invoice. Some retainers are billed monthly in arrears instead; either works if the agreement says which.
What is the difference between a retainer, a deposit and an advance payment?
A deposit or advance payment is part of the price of one specific job, billed before it is delivered and deducted from the final invoice. A retainer pays for ongoing access or work each period, and each period's invoice stands on its own.
What happens to unused retainer hours?
Whatever the agreement says. Common options are that unused hours expire at the end of the period, roll over to the next period up to a cap, or are credited against future work. Show the rule and the result on each invoice so the client is not surprised.
Can a lawyer use this retainer invoice?
Not for collecting an advance fee. Under ABA Model Rule 1.15, as adopted in each state's version, fees paid in advance are client money held in trust and withdrawn only as they are earned. Bill earned fees on an invoice paid to the firm's operating account and show any amount applied from trust, as in the legal services invoice template, and follow your state bar's rules.
Can I create a retainer invoice in InvoiceQuickly?
Yes, as an ordinary invoice with the retainer fee, overage and expenses as separate lines. InvoiceQuickly does not track retainer balances or rollover. Pro can log hours with a timer or manual entries, but it does not count them against the allowance, so keep the balance in your own records and put it in the notes. On Pro, a monthly recurring schedule can create the fixed fee as a draft each period for you to review; it creates one line with the saved tax and discount rates and saved payment terms (30 days by default), so add overage, expenses and tax to the draft before sending.