What Is a Law Firm Cash Reserve and How Big Should It Be?

What Is a Law Firm Cash Reserve and How Big Should It Be?

A law firm cash reserve is money the firm itself sets aside to cover its bills when fees arrive late, slow down or stop for a while. It can be the difference between a bad quarter and a missed payroll. It is also firm money only: the funds held in trust for clients are never part of it.

This is a general explainer, not advice for your firm. The right size depends on how your fees arrive, what your fixed costs are and how much risk you can carry.

Legal Ease, a Fort Worth bookkeeping firm that specializes in law firms, is one firm to ask about the monthly numbers behind a reserve. Legal Ease is a vetted Sam's List member and a paying member of our featured program; payment does not buy the language we use or its reviews.

Why a Law Firm Cash Reserve Matters More Than It Does Elsewhere

Many law firms get paid unevenly. A contingency practice may wait months or years for a case to resolve, then receive a large fee at once. A flat-fee practice collects at the start of a matter and spends the time afterward. Even hourly firms wait on slow-paying clients, and a billed hour is not cash until the client pays.

Meanwhile the costs do not wait. Salaries, rent, software, insurance and bar dues come due on a calendar, whether or not a settlement has arrived. A firm with no cushion may borrow, delay paying staff or, in the worst case, be tempted to dip into the wrong account.

The limitation: a reserve cannot fix a practice that spends more than it earns. It buys time to make changes, and it will not make up for fees that are too low or costs that are too high.

Trust Money Is Not Reserve: The One Account You Cannot Touch

Money held in a trust account belongs to clients, or to third parties, until it is earned or disbursed. It sits at the firm's bank in a separate trust account, not on the firm's side of the ledger. Even when the firm is short, trust money cannot be used to cover payroll or rent, and a temporary borrowing that is later repaid can still be a violation.

So the first rule of sizing a law firm cash reserve is to leave trust funds out of every number. A bank balance that looks comfortable may be mostly client money. Look only at the firm's operating funds and the reserve account when you ask whether the firm is safe.

Many firms check this monthly as part of the trust reconciliation. The reconciliation shows what belongs to clients. What is left, in the operating account, is what the firm can count.

The limitation: trust rules differ by state. Confirm with your state bar what you may do with earned fees left in trust and how quickly they must be moved out.

How to Size a Law Firm Cash Reserve From Monthly Fixed Costs

Start with the fixed costs you owe every month whether or not fees arrive. Add payroll and related taxes, rent, software and subscriptions, insurance, loan payments and a modest amount for the rest. Leave out costs that stop when work stops, such as case costs that a client will repay.

A common rule of thumb is to hold three to six months of those costs. It is a rule of thumb and not a standard, and no bar or regulator sets it. A firm with steady monthly retainers may be comfortable at the low end. A contingency firm with long gaps between fees may want more.

Here is an example with invented and rounded numbers. A small firm owes $28,000 in payroll and payroll taxes, $6,000 in rent, $2,000 in software, $1,500 in insurance and $2,500 in other fixed costs each month.

Item	Monthly amount
Payroll and payroll taxes	$28,000
Rent	$6,000
Software and subscriptions	$2,000
Insurance	$1,500
Other fixed costs	$2,500
Total, one month of operating expenses	$40,000

The arithmetic: $28,000 plus $6,000 plus $2,000 plus $1,500 plus $2,500 is $40,000 a month. Three months is $120,000, and six months is $240,000, so the target range is $120,000 to $240,000.

The limitation: the number describes costs and not risk. A firm that depends on one large case needs to think about what happens if it is lost, which no multiple of monthly costs captures.

Where to Keep a Law Firm Cash Reserve

Keep the reserve in a separate account titled in the firm's name, away from the daily operating account and away from trust. A separate account makes the balance visible, so a partner can see how much has been set aside and the firm is less likely to spend it by accident. Some firms keep it in a savings account or a money market account that is easy to reach.

Never keep it in the trust account, even temporarily. Commingling firm money with client money is a classic way to end up in a disciplinary matter, and it makes the reconciliation harder to read. If your state allows a modest amount of firm money in trust to cover bank charges, that is a narrow exception and not a place to park a reserve.

The reserve should also be separate from money you have set aside for taxes. A quarterly estimated tax payment is a known bill, and counting it twice makes the firm look safer than it is.

The limitation: money that is easy to reach is easy to spend. Write down what the reserve is for, who may approve a withdrawal and how it will be replenished.

Building the Reserve From Fees as They Arrive

Most firms build a reserve in small steps, not in one move. A common method is to move a fixed percentage of each fee deposit, or a fixed dollar amount each month, into the reserve account until it reaches the target. After a withdrawal, the same method refills it.

For a contingency firm, a large fee is the natural moment to fund it. Decide in advance how much of the next big fee goes to the reserve, before the money has been committed to bonuses, equipment or draws.

A bookkeeper can help by reporting the number each month: fixed costs, the reserve balance and the number of months it covers. That turns a vague worry into a figure someone looks at. Treat that number as a prompt for a conversation, not as proof that the firm is healthy.

The limitation: a growing firm's costs also grow, so a reserve that covered four months last year may cover two now. Recalculate whenever payroll or rent changes.

Where Legal Ease Fits

Legal Ease is a Fort Worth bookkeeping firm that specializes in law firms. It was founded in 2016, has 12 employees and serves clients nationwide. Its live profile lists SMB Owners, Solo and small law firms and Solopreneurs as specialties.

Legal Ease has 9 verified client reviews on Sam's List. Each review is submitted by an individual who identifies as a client of the firm and rates it on communication, subject-matter knowledge, and overall satisfaction. Reviews reflect those individual experiences and do not represent an endorsement by Sam's List. Legal Ease is a paying member of our featured program, and payment does not buy its reviews. Ratings and rankings are not indicative of future performance or results.

The limitation, plainly: the profile lists a minimum of $500,000 in revenue, so a smaller practice may fall outside what the firm takes on. It does not mention reserve planning or cash forecasting by name, so ask what reporting is included and whether a monthly cash summary is part of it.

Frequently Asked Questions

What is a law firm cash reserve?

It is money a law firm sets aside, in an account titled in the firm's name, to cover its fixed costs when fees are late or slow. It is firm money and never includes client funds held in trust. Confirm your state's rules on trust accounts with your bar.

How much should a law firm keep in reserve?

A common rule of thumb is three to six months of fixed operating costs, though it is not a standard. Steady retainer firms may need less, and contingency firms with long gaps between fees may need more. Calculate from your own monthly costs.

Can a law firm use trust money as a reserve?

No. Funds in a trust account belong to clients or third parties until earned or disbursed, and borrowing from them, even briefly, can violate your state's rules. Keep the reserve in a separate firm account and confirm your obligations with your state bar.

Where should a law firm keep its cash reserve?

In a separate account in the firm's name, apart from the operating account and the trust account. A savings or money market account is common. Write down who may approve a withdrawal and how the reserve will be refilled.

Before you pick a target, add up your fixed costs for a normal month and look at how many months of them your operating account covers today. You can browse bookkeepers on Sam's List, including the firm above, and ask each one what monthly reporting comes with the work.

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About the author: Kimberly Green is the cofounder of Sam's List, where business owners and high earners find vetted CPAs, financial advisors, and fractional CFOs. She's met one-on-one with 400+ financial professionals and writes from the real data behind thousands of client-advisor matches. Ask her anything about finding an accountant - she's heard it all, including the questions people are afraid to ask.