How to Set Up Evergreen (Recurring) Retainer Billing at Your Law Firm in 2026: The 8-Step Workflow That Keeps Trust Funded and Cash Flow Steady

Evergreen retainers — where a client keeps a minimum balance in trust that auto-replenishes as you bill against it — are the cleanest way to stabilize cash flow without chasing invoices. Here's the 8-step setup that keeps your IOLTA compliant, your replenishments automatic, and your realization high.

Published: 2026-06-25T12:53:49.760Z · Category: Legal Accounting · 8 min read

💡 IN SHORT

An evergreen retainer requires the client to maintain a minimum balance in your trust account that automatically tops back up as you bill against it. Done right, it turns lumpy, invoice-chasing cash flow into a steady, predictable stream — while keeping you fully IOLTA-compliant. This guide walks through the 8 steps to set one up: defining the floor, drafting the engagement clause, depositing to trust, billing against it, triggering replenishment, and reconciling.

👥 Who should read this: Managing Partners Billing Managers Bookkeepers Solo Attorneys

💸 Why Evergreen Retainers Beat One-and-Done Retainers

A traditional retainer is a single deposit you bill against until it runs dry — and then you're back to invoicing, waiting, and following up. An evergreen retainer sets a minimum balance the client agrees to maintain. As you earn fees and move them out of trust, the balance dips below the floor, and the client replenishes it back up. The result: you're rarely working unfunded, and your collections become predictable instead of reactive.

📊 Did You Know?

Firms that move steady clients onto evergreen retainers typically see their days-sales-outstanding (DSO) drop sharply, because the cash is already in trust before the work is done. The bill becomes a transfer authorization, not a collection effort.

🪜 The 8-Step Evergreen Retainer Setup

1️⃣ Set the Minimum Balance (the "Floor")

Base the floor on roughly one billing cycle of expected work — often one to two months of average fees for that matter. Too low and you'll be replenishing constantly; too high and the client pushes back. The floor should comfortably cover the work you expect between replenishments.

2️⃣ Draft the Evergreen Clause Into the Engagement Letter

The engagement agreement must state the minimum balance, that funds are held in trust until earned, that you will bill against trust as fees are earned, and that the client agrees to replenish to the floor within a set number of days of notice. Clarity here prevents fee disputes later.

⚠️ Watch Out

Never treat the evergreen deposit as earned income on day one. It is the client's money held in trust until you actually earn it. Booking it as revenue early is one of the fastest ways to land a commingling or misappropriation finding.

3️⃣ Deposit the Initial Retainer Into Your IOLTA Trust Account

The opening balance goes into your client trust (IOLTA) account, recorded against a matter-level trust ledger. Operating cash and trust funds must never touch the same account.

4️⃣ Track Fees Earned in Real Time

As attorneys log billable time or post flat-fee milestones, you accumulate earned fees against the matter. You can only move money out of trust once it's actually earned and the client has been billed.

5️⃣ Bill Against Trust and Transfer Earned Fees

Generate the invoice, then transfer the earned amount from trust to operating. Document the transfer with the invoice number and date so the audit trail is airtight.

6️⃣ Trigger Replenishment When the Balance Dips Below the Floor

The moment the trust balance falls under the minimum, the client gets a replenishment request to top back up to the floor. Automating this trigger is what makes "evergreen" actually evergreen.

7️⃣ Reconcile the Trust Account (Three-Way)

Every month, reconcile the bank balance, the book balance, and the sum of all client ledgers. For evergreen matters with frequent movement, this catches errors before they compound.

8️⃣ Review Floors Quarterly

As a matter's intensity changes, the floor should too. A quarterly review keeps replenishment frequency reasonable for both you and the client.

💡 Pro Tip

The biggest failure point isn't policy — it's manual monitoring. If a human has to remember to check whether each trust balance dropped below its floor, replenishment requests get missed and you end up working unfunded. Automate the trigger.

🛠️ How LawAccounting Runs Evergreen Retainers On Autopilot

LawAccounting was built so the entire evergreen loop — fund, bill, transfer, replenish, reconcile — runs without spreadsheet babysitting.

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Matter-Level Trust Ledgers

Every evergreen retainer has its own trust ledger with real-time balance tracking, so you always know exactly what's funded.

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Automatic Replenishment Alerts

When a balance dips below its floor, the system flags it — no human has to remember to check.

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Clean Trust-to-Operating Transfers

Earned-fee transfers are documented against the invoice with a full audit trail, keeping IOLTA pristine.

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Built-In Three-Way Reconciliation

Bank, book, and client-ledger balances reconcile in one place, catching breaks before a bar auditor would.

✅ Key Takeaways

An evergreen retainer requires the client to maintain a minimum trust balance that auto-replenishes as you bill against it — stabilizing cash flow.
Set the floor at roughly one billing cycle of work and write the replenishment terms clearly into the engagement letter.
Funds stay in trust until earned; only transfer to operating after billing, with a documented audit trail.
Automating the below-floor replenishment trigger is what prevents unfunded work — LawAccounting handles the fund-bill-transfer-replenish-reconcile loop end to end.

Make Your Retainers Truly Evergreen

See how LawAccounting tracks every trust balance in real time, fires replenishment alerts automatically, and keeps your IOLTA reconciled — so you're never working unfunded again.

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