How Much Cash Should a Law Firm Keep in Reserve?

Jim Field • February 5, 2026

Building a Cash Reserve For Your Law Firm

Running a law firm comes with a lot of financial uncertainty. Unforeseen expenses, client payment delays, and dramatic fluctuations in revenue are extremely common. This is why it’s so important to establish a cash reserve. 


When gaps in a law firm’s cash flow arise, a cash reserve can help you continue managing recurring expenses and keep day-to-day operations running smoothly. Before we explain how to build a cash reserve for your firm, let’s explore why cash reserves are so vital for a law firm’s financial stability in the first place.


Running a law firm comes with a lot of financial uncertainty. Unforeseen expenses, client payment delays, and dramatic fluctuations in revenue are extremely common. This is why it’s so important to establish a cash reserve.

 

When gaps in a law firm’s cash flow arise, a cash reserve can help you continue managing recurring expenses and keep day-to-day operations running smoothly. Before we explain how to build a cash reserve for your firm, let’s explore why cash reserves are so vital for a law firm’s financial stability in the first place.

 

Why Every Law Firm Needs a Cash Reserve

 

Your law firm’s cash reserve isn’t just a “rainy day fund” that’s only intended for serious emergencies. Many firms use their cash reserves to:

 

  • Cover unexpected expenses like technology updates or office repairs
  • Continue meeting payroll when revenue dips temporarily
  • Invest in growth opportunities
  • Attain the peace of mind from focusing exclusively on serving clients without worrying about the firm’s survival

 

How Much Cash Should a Law Firm Keep in Reserve?

 

Generally speaking, it’s recommended for a law firm to have 3 to 6 months’ worth of operating expenses in a cash reserve. To determine the size of your firm’s reserve, add up all of your fixed expenses - rent, utilities, payroll, software subscriptions et cetera. Next, factor in any fluctuating or seasonal expenses, so you can get a clearer picture of your average monthly overhead.

 

Multiply your monthly overhead by a number between 3 and 6, and the answer is your target cash reserve.

 

Firms with contingency-based practices or more volatile or unpredictable revenue might consider a larger reserve to account for periodic dips in revenue based on case volume. Conversely, firms with steady retainer-based income typically have more safety because their cash flow is more stable, and so may opt for a slightly lower number.

 

Building a 13 Week Cashflow Map

 

One recommendation we’ve given clients is to build a 13-week cashflow map of their predicted expenses. The process is pretty simple: on a spreadsheet, built a five row, 14 column data set.

 

The rows are:

  • Dates of the Week
  • Inflows
  • Outflows
  • Ending balance
  • Beginning Balance

 

The columns are the week. Look at your regular monthly expenses and see what date they come out of the firm’s account (you can record them lower on the spreadsheet if you want). Add the expenses and put them as a negative in the outflows row for that week. If your revenue is predictable, put that in the inflows.

 

Every week, update your beginning balance, delete last week’s column, and add a new Week 13 column. This gives you a clear roadmap for the next quarter of the year and makes it easier to manage cash flow (so you can divert funds into your reserve fund).

 

Tips for Law Firm Budgeting to Build a Cash Reserve

 

Building a sufficient cash reserve takes time, but it’s perfectly feasible with the right strategy. Here are a few tips for getting started:

 

1. Consider an Emergency Line of Credit

 

A line of credit should be the last safety net – you want to outline the reasons you would utilize it long before you need it so it isn’t used for convenience, just actual emergencies. But if you are starting out, an emergency line of credit is a way for you to sleep at night as you’re building your reserve fund.

 

2. Start Small

 

Start with small, consistent monthly contributions to begin building your cash reserve. Focus on using a fixed percentage of revenue, something like 10-15%.

 

3. Profit Allocation

 

Partner bonuses should be limited until your cash reserve hits your target. Think of it as an essential expense in your budget until you reach your reserve goal.

 

4. Automate Savings Transfers

 

Once you’ve calculated your monthly contribution, set up an automatic transfer from your operating account to your reserve account each month. It may seem like a small step, but consistency is crucial for building a cash reserve. Automation also eliminates the temptation to skip a contribution in exchange for short-term savings.

 

5. Review and Adjust Periodically

 

Review your reserve strategy on a quarterly basis and adjust your contributions based on your firm’s financial status. Do you have any major expenses coming up in the near future? Have any of your operating costs gone up? If so, you may need to raise your cash reserve target to align with your firm’s growth.

 

A strong cash reserve keeps your firm financially stable, even if you don’t use it very often. By setting realistic targets and making monthly contributions, you’ll be able to navigate the myriad uncertainties of the legal industry with more confidence. Most importantly, it gives you the freedom to focus on doing what you do best: advocating for your clients.

 

If you’re ready to run your firm with more clarity, control, and confidence, the next step is a conversation. In addition to being a lawyer, our founder has decades of experience as a COO and turnaround consultant and a proven track record translating complex financial and operation concepts into practical, understandable guidance, let’s set up a free consultation to see if our knowledge and experience helping law firms would help you. A short strategy call can help you see what’s holding your firm back—and what to do next.






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