---
title: "Retainer Invoice: Meaning, Template and a Worked Example"
description: "A retainer invoice bills a client in advance for work you will do later. See the fields, the accounting entries and a worked example with numbers."
canonical: https://luckpanda.app/blog/retainer-invoice
author: "Dhrumil Barot"
author_bio: "Dhrumil is a small-business operations and compliance expert. Dhrumil built LuckPanda so small businesses can run invoicing, inventory, accounts and compliance in one place."
published: 2026-11-05
updated: 2026-11-05
category: "Invoicing basics"
keywords: "retainer invoice"
language: en
---

# Retainer Invoice: Meaning, Template and a Worked Example

A retainer invoice bills a client in advance for work you will do later. See the fields, the accounting entries and a worked example with numbers.

By [Dhrumil Barot](https://luckpanda.app/about#founder), Founder. Published 5 Nov 2026. Updated 5 Nov 2026. 7 min read.

**TL;DR:** A retainer invoice asks a client to pay in advance for work you will do later. Until you do the work, that money is a liability (an advance you owe back in work or cash), not revenue. You draw it down with a normal invoice each period, and the contract decides what happens to anything unused.

A retainer invoice is a request for advance payment that reserves your time or funds future work for a client, usually a fixed amount each month. It looks like an invoice, but the money it collects is not yet earned: in your books it sits as a client advance until you deliver, and you then raise a regular invoice against it. A design agency that bills a ₹1,00,000 monthly retainer and does ₹80,000 of work that month has earned ₹80,000; the other ₹20,000 rolls over, is refunded or is kept, depending on the retainer agreement. Below: the fields a retainer invoice template needs, the journal entries, a worked example and the tax timing in India, the UK and elsewhere.

## What is a retainer invoice?

A retainer invoice is a document that bills a client before the work, under a retainer agreement. A retainer agreement is a work-for-hire contract where "the client or customer pays in advance for professional work to be specified later" ([Wikipedia, Retainer agreement](https://en.wikipedia.org/wiki/Retainer_agreement)). It can be one advance payment or a recurring monthly one.

Lawyers, agencies, consultants, accountants, developers and freelancers use retainers for the same reason: the client gets guaranteed capacity, and you get cash before you spend the hours.

There are three common kinds, and the invoice wording should say which one you mean ([Cornell LII, Retainer](https://www.law.cornell.edu/wex/retainer)):

| Type | What the client pays for | Is it earned on receipt? |
| --- | --- | --- |
| General (availability) retainer | Reserving your time; work is billed separately | Usually yes, if the contract says it is for availability |
| Security retainer | A fund that pays future invoices, held until earned | No; drawn down as you bill |
| Advance fee retainer | Prepayment for the services themselves | No; earned as the work is done |

For lawyers in the US, a security retainer goes into a trust account and reaches the lawyer only as fees are earned, and some states restrict advance fee retainers altogether ([Cornell LII](https://www.law.cornell.edu/wex/retainer)). Check your bar's rules before using the template for legal work.

## How does it differ from a regular invoice?

A regular invoice bills for work already delivered; a retainer invoice bills for work not yet delivered. That one difference changes the accounting, the tax timing and the wording.

|  | Retainer invoice | Regular (final) invoice |
| --- | --- | --- |
| Bills for | Future work or reserved capacity | Work or goods already delivered |
| In your books | Liability (client advance, unearned revenue) | Revenue and a receivable |
| Line items | Retainer amount for a period | Hours, deliverables or items |
| Typical label | "Retainer invoice", "Advance invoice" | "Invoice", "Tax invoice" |
| Followed by | A final invoice that applies the retainer | Payment, or a credit note if corrected |
| Refundable? | Often, if work is not done (contract decides) | No, it is a debt for delivered work |

A retainer invoice is also not a [proforma invoice](https://luckpanda.app/templates/proforma-invoice-format). A proforma is a quote-like preview of a future invoice and asks for no money in your books; a retainer invoice collects real money.

## Which fields does the template need?

A retainer invoice template needs the usual invoice fields plus four that make the advance traceable:

1. **Title** "Retainer invoice" (or "Advance invoice") so nobody books it as revenue.
2. **Your business and client details**, including tax IDs (GSTIN, VAT number) where they apply.
3. **Number and date**, from a separate series or prefix such as RET-2026-011.
4. **Period covered**, for example 1 to 30 November 2026.
5. **Scope of the retainer**: hours included, services, response times.
6. **Amount, tax and total**, in the client's currency.
7. **How it will be applied**: "Applied against invoices for work in this period".
8. **Unused balance rule**: rolls over, refunded, or non-refundable for availability.
9. **Due date and payment details**: bank details or a payment link, due before the period starts (for example 7 days before the 1st).

![A retainer runs in four steps: bill in advance, record a liability, invoice the work, settle the balance](https://cdn.sanity.io/images/pcmcvz9y/production/44e1d1eb64f7a859457629acba6120fc2f35b1ad-1344x326.png?w=1200&auto=format&fit=max)

*Revenue appears only at the third step.*

## How do you account for a retainer payment?

You account for a retainer payment as a liability when it arrives and move it to revenue as you deliver. Zoho's own help puts it plainly: an advance "will not be an income but a liability to the company. The revenue is earned only when the product is delivered or the service is completed" ([Zoho Books help](https://www.zoho.com/us/books/help/retainer-invoice/)). Under [IFRS 15](https://www.ifrs.org/issued-standards/list-of-standards/ifrs-15-revenue-from-contracts-with-customers/) (and Ind AS 115 in India), revenue is recognised when a performance obligation is satisfied, and for services that is usually over time as the work happens. The liability is called deferred income, unearned revenue or a contract liability ([Wikipedia, Deferred income](https://en.wikipedia.org/wiki/Deferred_income)).

The entries, without tax:

| When | Debit | Credit |
| --- | --- | --- |
| Client pays the retainer | Bank | Client advance (liability) |
| You invoice the month's work | Client advance | Revenue |
| You refund the unused part | Client advance | Bank |
| Unused part is non-refundable per contract | Client advance | Revenue |

The exception is a true availability retainer: if the contract says the fee buys your availability and is non-refundable, it is earned for that period as the period passes, not on delivery of specific work.

## Worked example: a monthly retainer with numbers

A Mumbai design studio signs a client on a ₹1,00,000 monthly retainer covering up to 40 hours at ₹2,500 an hour, plus 18% GST. Unused hours roll over one month, then lapse.

**1 November: retainer invoice and payment.** The studio issues retainer invoice RET-2026-011 for ₹1,00,000 + ₹18,000 GST = ₹1,18,000. The client pays on 3 November. GST on an advance for services is due when the payment is received (see the tax section below), so the studio books:

- Bank ₹1,18,000 debit
- Client advance ₹1,00,000 credit
- Output GST ₹18,000 credit

**30 November: final invoice.** The team logged 32 hours, so the work is 32 × ₹2,500 = ₹80,000. The studio raises tax invoice INV-2026-118 for ₹80,000 and applies ₹80,000 of the retainer, so the invoice shows ₹0 due. The GST on that ₹80,000 (₹14,400) was already paid on the advance, so it is adjusted, not charged twice.

- Client advance ₹80,000 debit
- Revenue ₹80,000 credit

**The unused ₹20,000** (8 hours, 20% of the fee) rolls into December. If December also ends unused, the contract says it lapses: the studio moves ₹20,000 from client advance to revenue. If the contract had said "refundable", the studio would instead issue a refund voucher and repay ₹20,000 plus the ₹3,600 GST on it, and reverse that tax.

![November retainer: ₹1,00,000 billed in advance, ₹80,000 earned, ₹20,000 carried to December](https://cdn.sanity.io/images/pcmcvz9y/production/eaaf49abb9f75a2d5159c4e5ff9ae8043984e63c-1344x410.png?w=1200&auto=format&fit=max)

*Only the ₹80,000 of work done is revenue in November.*

## What happens to unused retainer funds?

Unused retainer funds follow the retainer agreement, so write the rule on both the contract and the invoice. The usual options:

- **Roll over:** the balance carries into the next period, often with a cap (30 days, or up to 20% of the fee).
- **Refund:** you return the balance at the end of the period or the engagement. Without an agreement saying otherwise, a retainer is generally refundable if the work is not done ([Wikipedia, Retainer agreement](https://en.wikipedia.org/wiki/Retainer_agreement)).
- **Use it or lose it:** the client pays for capacity, and unused hours lapse. Defensible for availability retainers; spell it out.
- **Replenish (evergreen):** common for legal security retainers. You bill against the fund and the client tops it back up to the agreed level.

In the books, a refund reduces the liability and the bank; a lapse moves the liability to revenue.

## When is GST or VAT due on an advance?

Tax on a retainer often falls due when the advance is paid, not when the work is done, so price the retainer with tax included.

- **India (GST):** for services, the time of supply is the earlier of the invoice date or the date of receipt of payment ([CGST Act, section 13(2)](https://cbic-gst.gov.in/hindi/CGST-bill-e.html)). GST on a service advance is due in the month you receive it. Section 31(3)(d) requires a receipt voucher when you receive an advance, and section 31(3)(e) a refund voucher if the supply does not happen. Advances for goods are treated differently. An amount up to ₹1,000 received in excess of the invoice value can be taxed at the invoice date instead, at the supplier's option.
- **UK (VAT):** a payment received in advance creates a tax point for the amount received ([HMRC VATTOS3600](https://www.gov.uk/hmrc-internal-manuals/vat-time-of-supply/vattos3600)), and VAT is due on deposits that are part payment for a supply ([VAT Notice 700](https://www.gov.uk/guidance/vat-guide-notice-700)).
- **US:** most services are not subject to sales tax; income tax timing for advance payments has its own rules, so ask your accountant.

This is information, not tax advice. Check the rules for your registration and contract.

## Retainer vs deposit vs proforma

These three get mixed up because each comes before the work.

|  | Retainer invoice | Deposit invoice | Proforma invoice |
| --- | --- | --- | --- |
| Purpose | Fund ongoing or future work | Secure one project or order | Preview the final invoice |
| Recurs? | Often monthly | Once per project | Once |
| Money in your books | Liability until earned | Liability until delivery | None |
| Common in | Agencies, law, consulting | Construction, events, custom goods | Exports, approvals |

## Common mistakes to avoid

- **Booking the retainer as revenue.** It inflates the month it arrives and leaves later months looking empty.
- **Billing late.** A retainer sent 15 days into the month is a regular invoice with extra steps; send it 5 to 7 days before the period.
- **No period on the invoice.** "Retainer" with no dates makes it hard to match payments to months.
- **Charging GST twice.** If tax was paid on the advance, the final invoice applies it, it does not add it again.
- **No unused-balance rule.** State the cap in hours (say 8 hours or 20%) and the deadline (30 days or 60 days). Disputes about leftover hours are the most common retainer argument.
- **Same number series as final invoices.** Use a separate prefix so your sales register is clean.

## Tools to make the template

Any invoice tool can produce the document; the difference is whether it tracks the advance. Zoho Books has a dedicated retainer invoice module on its Professional plan and above ([Zoho Books help](https://www.zoho.com/us/books/help/retainer-invoice/)). Spreadsheet templates work for one client but don't track balances. In LuckPanda's Sales module you can set up the monthly retainer as a [recurring invoice](https://luckpanda.app/modules/sales/recurring), record the payment and issue a [receipt](https://luckpanda.app/tools/receipt-generator); drafts and branded PDFs are free, and issuing and sending need the Sales module at ₹249 a month. To try the layout first, use the free [invoice generator](https://luckpanda.app/tools/invoice-generator), title it "Retainer invoice" and add the period and unused-balance rule.

Related: [consulting invoice template](https://luckpanda.app/templates/consulting-invoice-template), [legal invoice template](https://luckpanda.app/templates/legal-invoice-template) and [what an invoice must include](https://luckpanda.app/blog/what-is-an-invoice).

## Questions

### What is a retainer invoice?

A retainer invoice is a bill for advance payment under a retainer agreement. It collects money for work you will do later or for reserving your time, and the money is a liability in your books until you earn it.

### How does it differ from a regular invoice?

A regular invoice bills for work already delivered and creates revenue. A retainer invoice bills before the work and creates a client advance; a later final invoice applies that advance.

### How do you account for a retainer payment?

Record it the day it arrives, not 30 days later: debit bank and credit a client advance (liability) when paid. When you invoice work, debit the client advance and credit revenue. Refunds debit the advance and credit bank.

### What happens to unused retainer funds?

Whatever the retainer agreement says: they roll over, are refunded, lapse as non-refundable, or are topped up in an evergreen retainer. Without a clause, a retainer is generally refundable if the work is not done.

### Is GST charged on a retainer invoice?

Yes, for taxable services in India. GST is due when the advance is received, under section 13(2) of the CGST Act, and you issue a receipt voucher for it. The final invoice adjusts the tax already paid.

### Should a retainer invoice be sent before the month starts?

Usually, yes. Most retainers are payable in advance so the funds are in place before the work begins; set the due date on or before the first day of the period.

## More guides

- [Invoice Layout for Word: How to Make an Invoice in Microsoft Word That Adds Up](https://luckpanda.app/blog/how-to-make-an-invoice-in-word)
- [How to Invoice as a Freelancer: Steps, Terms and Rules](https://luckpanda.app/blog/invoice-as-a-freelancer)
- [Itemized receipt: what it must show, with examples and rules](https://luckpanda.app/blog/itemized-receipt)

## Related tools

- [Invoice generator](https://luckpanda.app/tools/invoice-generator): Bill a client in any currency, with tax worked out as you type.
- [Receipt generator](https://luckpanda.app/tools/receipt-generator): Confirm a payment you received, itemised.

## About the author

**Written by [Dhrumil Barot](https://luckpanda.app/about#founder)**, Founder. Dhrumil is a small-business operations and compliance expert. Dhrumil built LuckPanda so small businesses can run invoicing, inventory, accounts and compliance in one place. [LinkedIn](https://www.linkedin.com/in/bdhrumil) · [X](https://x.com/fyidhrumil)