Can LeanLaw Automatically Bill a Recurring Flat-Fee Retainer Every Month?

Yes, on a schedule you set, and it’s a different mechanism from evergreen trust replenishment even though both get called “automatic billing.” Recurring flat-fee invoicing issues the same fixed bill on a repeating schedule. Evergreen replenishment tops up a trust balance by whatever amount brings it back to a floor.

What recurring flat-fee billing actually does

A flat-fee arrangement can be flagged as repeating, so the same invoice amount generates at each interval — monthly is the common one — without a person recreating it from scratch every period. The amount stays fixed because the fee itself is fixed; nothing about a recurring flat fee references hours worked, because the whole point of a flat fee is that hours worked isn’t what’s being billed. That holds even on a matter that also tracks hourly time alongside the flat fee for a different scope of work — the recurring piece and the hourly piece are billed on their own separate logic.

Why the two get confused with each other

Evergreen retainer replenishment is a different mechanism aimed at a different problem. Recurring flat-fee billing is a revenue-side action: it produces an invoice for fees the firm has earned on a schedule. Evergreen replenishment is a trust-side action: it restores a client’s trust balance to a set floor whenever draws against already-deposited funds push it below that floor. One creates a bill for work done; the other asks a client to top up money the firm doesn’t yet own.

The two get conflated because both feel automatic from the client’s side, and both can run monthly. But the amounts behave completely differently. Say a firm bills a $2,000 flat retainer every month — that invoice reads $2,000 every time, on schedule, regardless of the trust balance. A firm running evergreen replenishment on a $5,000 trust floor tops up whatever the account fell below that floor: $1,200 one month, $3,400 the next, never the same number twice. Same word, “automatic,” two entirely different numbers driving it, and mixing them up in a client’s mind is usually where a “why did my bill change” conversation starts.

Does a recurring flat fee need an end date?

That depends on what the engagement letter actually says, not on anything the billing schedule assumes by default. Some flat-fee retainers are genuinely open-ended, running until either side ends the relationship. Others are tied to a fixed-term engagement and should stop generating invoices once that matter or that term closes. The billing schedule is downstream of that decision, not the other way around — the engagement letter is where “does this end” actually gets answered.

What this depends on

• Whether the engagement letter defines an open-ended retainer or a fixed-term one tied to a specific matter.
• Whether any portion of the flat fee touches trust before it’s actually earned.
• How your chart of accounts recognizes flat-fee revenue on a schedule versus at completion of the work.
• Applicable trust accounting rules in your jurisdiction, if part of the fee sits in trust before it’s earned.

The question that actually decides the setup

Before setting anything to repeat, the real question is whether you’re billing for fees already earned on a fixed schedule, or replenishing funds you’re holding against fees not yet earned. Those are two different answers to two different problems, even on months when the invoice a client sees looks about the same either way. If the same flat fee shows up on more than one matter, saving it as a reusable template is a separate decision worth making once the schedule question is settled.

Related questions

Can you set up recurring invoices so they go out automatically every month? Yes — a flat-fee arrangement can be set to generate the same invoice on a repeating schedule instead of being recreated by hand each period.

Do recurring flat-fee invoices need an end date? Only if the engagement itself has one; an open-ended retainer can keep billing until the relationship ends, while a fixed-term matter should stop generating invoices once that term or matter closes.