Law school teaches contracts, torts, and procedure. It doesn't teach how to read a balance sheet, manage trust accounts, or understand the difference between cash and accrual accounting. Most attorneys running their own firms figure this out on the job — often after an expensive mistake.
You don't need to be an accountant to run a financially healthy law firm. You need to understand enough to ask the right questions, read the right reports, and recognize when something is wrong. This is that guide.
Cash vs. Accrual Accounting: Which One You're Using and Why It Matters
Most small law firms use cash-basis accounting. Under cash accounting, revenue is recognized when it's received and expenses are recorded when they're paid. If you invoice in December but collect in January, December's P&L doesn't include that revenue — January's does.
Accrual accounting recognizes revenue when it's earned (invoice sent) and expenses when they're incurred (bill received), regardless of when cash moves. This gives a more accurate picture of economic activity but is more complex to maintain.
For most solo and small firm attorneys, cash basis is appropriate and is what most legal accounting software defaults to. The important thing is knowing which method you're using, because it affects how you interpret your financial statements. A cash-basis P&L with a strong month may simply reflect invoices that were delayed — not actual performance improvement.
Your CPA will typically advise you on which method is appropriate and required for your tax filing. The IRS requires accrual accounting for firms above certain revenue thresholds, which is another reason to have a legal-focused CPA reviewing your books annually.
The Chart of Accounts for a Law Firm
Your chart of accounts is the list of all accounts used to categorize financial transactions. Law firms need a few accounts that most businesses don't: operating accounts, trust accounts, client advance accounts, and the accounts that distinguish earned fees from retainer funds not yet applied.
The key distinction for attorneys: client funds held in trust are not law firm revenue. They belong to the client until earned. Retainers received but not applied to work are liabilities, not income. Mixing client funds with operating funds is an IOLTA violation, which is both a bar rules matter and a financial crime in most jurisdictions. See our guide on IOLTA trust accounts for the complete rules and reconciliation process.
The Billing Cycle: From Hours to Collected Revenue
Understanding the billing pipeline is essential to reading your financial statements accurately. The stages are:
Time entry. Attorneys record time as work is performed. This is the foundation of the billing cycle — time not recorded can't be billed. Most billing software timestamps entries, which is useful for auditing realization.
Pre-bill review. Before invoices go out, someone (attorney, paralegal, or billing administrator) reviews time entries for accuracy, duplicates, and appropriate description. This is where working realization rate is set — time gets written down or off at this stage.
Invoice generation and delivery. The invoice goes to the client. Best practice is monthly billing, sent within 5-7 days of month end. The longer the gap between work performed and invoice sent, the lower the collection rate.
Accounts receivable management. Outstanding invoices need systematic follow-up. See our collection rate guide for the escalation framework.
Payment receipt and application. When payment arrives, it's applied to the outstanding invoice and the revenue is recognized (under cash accounting). Trust retainers are applied to earned fees at this stage, moving funds from the trust account to the operating account — with full documentation of the transfer.
The Three Accounts Every Law Firm Must Maintain Separately
Operating account. The firm's day-to-day bank account. Revenue is deposited here. Expenses are paid from here. Attorney draws or salaries come from here.
IOLTA trust account. Client funds held in trust — retainers for work not yet earned, settlement proceeds awaiting disbursement, court filing fees collected from clients. Governed by strict bar rules. Never comingle with operating funds. Requires monthly reconciliation against client ledgers.
Business savings or reserve account. A separate account holding the firm's operating reserve. Target is 3 months of operating expenses. This is the cushion that lets the firm survive a slow billing month without making urgent staffing or overhead decisions.
Some states require a fourth account — a business trust account for nominal client funds where earned interest goes to a state-administered pool. Check your state bar's IOLTA rules for specifics.
What to Delegate and What to Retain
Managing partners at small firms often either do too much themselves (spending 5 hours per week on bookkeeping they should outsource) or delegate too much (losing visibility on firm finances until there's a crisis).
Safe to delegate: day-to-day bookkeeping (data entry, expense categorization, bank reconciliation), payroll processing, tax filing, and accounts payable management. These are time-consuming, rule-based tasks that a legal bookkeeper or accountant handles faster and more accurately than most attorneys.
Retain for yourself: the monthly financial review (30 minutes), any decision involving trust account withdrawals (you sign off, always), major expense commitments, and hiring decisions with compensation attached. Financial oversight is a managing partner responsibility that can't be fully delegated — you need enough visibility to know when something is wrong.
Common Law Firm Accounting Mistakes
The four accounting mistakes that hurt small law firms most often:
First, not reconciling trust accounts monthly. This is both a bar rules requirement and a protection against embezzlement. Monthly reconciliation catches discrepancies within 30 days instead of discovering a problem at year end.
Second, mixing personal and business finances. Paying personal expenses from the firm account creates accounting chaos and tax problems. Maintain a clear separation from day one.
Third, not tracking accounts receivable aging. Outstanding invoices that age past 90 days have a collection rate below 50% in most practices. Monthly AR review catches the problem before the invoice is effectively uncollectable.
Fourth, failing to budget. Operating without a budget means every expense decision is made in isolation. A simple annual budget — revenue target, overhead categories, attorney compensation — gives every month a benchmark to compare against.
The firms that manage their finances well don't necessarily have more accounting knowledge than their peers. They've built the systems and habits that keep the financial picture current. For the operational systems that feed into cleaner financials — automated billing reminders, faster invoice processing, reliable collections follow-up — book a free audit call to see what's possible for your firm.