How to Create a Law Firm Budget You Will Actually Use

What Makes a Budget Useless Before You Start

Two versions of a law firm budget consistently fail. The first is a budget built with too many line items, designed to capture every cost at a granular level, which becomes too time-consuming to maintain and gets abandoned after the first quarter. The second is a budget built once in January, filed, and never opened again until year-end. Both produce the same outcome: a document that provides no guidance when decisions actually need to be made.

A budget that works is built for a specific purpose: to let you compare what you planned against what happened, every month, in under an hour. That means it needs to be simple enough to update without help, complete enough to cover the decisions you actually face, and reviewed on a fixed schedule regardless of whether the month was good or bad.

Building the Budget From Real Numbers

Start with collected revenue from the last three to six months as your revenue baseline. Do not project from an aspirational number. Use what the firm has actually collected, averaged across recent months, and use that as your expected monthly revenue for the first version of the budget. You can adjust the projection once you have a few months of comparison data, but starting from reality prevents you from building a budget that is already wrong on day one.

Group expenses into a short list of categories rather than tracking every individual vendor. Fixed costs are the ones that do not change with volume: rent, software subscriptions, insurance, and regular staff salaries. Variable costs change with activity: contract help, filing fees, and any spend that scales with caseload. Keeping these two groups separate in the budget lets you see quickly which costs you can control in a slow month and which you cannot.

Core budget line items

• Collected revenue (monthly average from recent actual)
• Fixed costs: rent, software, insurance, base staff salaries
• Variable costs: contract help, filing fees, activity-linked expenses
• Owner working salary
• Estimated tax set-aside
• Reserve contribution

Adding Owner Pay and Taxes as Line Items

Owner pay and taxes are two line items that many small-firm budgets omit, which is precisely why those firms are surprised by cash shortfalls. Owner pay should appear as a fixed cost equal to the market-rate working salary you have decided to take. Budgeting it explicitly forces the question: does the expected collected revenue support this salary after all other costs? If it does not, that is the finding the budget is supposed to surface.

The tax line depends on your entity type, your income level, and the structure of your quarterly estimated payments. Your accountant should give you an estimated annual tax obligation that you can divide into monthly set-asides. The goal is not precision; it is preventing a large quarterly payment from creating a cash crisis because the funds were spent on something else.

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Comparing Plan to Actual Every Month

The comparison step is where the budget pays off. Each month, after the books are reconciled, place the actual figures next to the planned figures in the same document. For every line where actual differs from plan by a meaningful amount, ask one question: is this a timing issue, a new cost, or a signal about the business? Rent being one hundred dollars over budget is a timing issue. Marketing being three times budget without a corresponding increase in signed clients is a signal.

Do not adjust the plan to match the actual. Keep the original plan intact and note the variances each month in a separate column. After three or four months, the pattern of variances tells you more than any single month: which cost categories consistently run over, which revenue months are structurally lower than average, and where the budget itself was unrealistic at the start.

Why the Reserve Contribution Line Is Not Optional

A reserve contribution is a fixed amount you move from the operating account to a separate savings account each month, before you take a profit distribution or make discretionary purchases. Treating the reserve contribution as a budget line, not a year-end leftover, is what actually builds the reserve. If it appears in the budget, it gets funded. If it appears only when cash is strong, the reserve stays thin.

The target reserve size is a firm-specific decision based on your fixed monthly costs and how variable your revenue is. A firm with highly predictable monthly retainer revenue needs less reserve than one dependent on sporadic transaction closings. Set a target, build toward it systematically using the monthly contribution line, and protect it by not making the reserve contribution conditional on the rest of the month going well.

Building Your First Budget This Week

Pull your last three to six months of collected revenue and expenses from your accounting software. Calculate the monthly average for each. Set up a single document with the line items described above: revenue, fixed costs, variable costs, owner salary, tax set-aside, and reserve contribution. Fill in the averages as your starting planned figures. You now have a first draft.

Set a monthly review date, at least forty-five minutes, and book it now. In the first review, place last month's actuals next to the plan, note the variances, and ask what one change would bring the largest variance back toward plan. Do not try to fix everything. Address the largest gap first and let the remaining variances inform the next month's review.

• Pull three to six months of collected revenue and expenses from your accounting software.
• Calculate monthly averages and enter them as the planned figures in each budget line.
• Add owner salary, tax set-aside, and reserve contribution as separate lines.
• Set a fixed monthly review date of at least forty-five minutes and book it.
• In the first review, identify the largest variance and assign one specific action to address it.

Key terms used in this guide

Fixed costs

Expenses that remain roughly the same regardless of the firm's workload, such as rent and software subscriptions.

Variable costs

Expenses that rise and fall with activity levels, such as filing fees or contract support.

Variance

The difference between what you planned and what actually occurred in a given period.

Frequently asked questions

Sources and further reading

• U.S. Small Business Administration: Calculate your startup costs General guidance on identifying and categorizing business costs for planning purposes.
• SCORE: Business budget template A free budgeting template and accompanying explanation from a nonprofit small business mentoring organization.