AI Bookkeeping for Law Firms and Solo Attorneys
IOLTA three way reconciliation done right. Retainers held as liability, advanced client costs as asset, fees recognized only when earned. Clio, MyCase, and CosmoLex billing parsed line by line. $79 flat, unlimited matters and trust accounts.
Zera Books is the AI bookkeeping platform for law firms because it runs the IOLTA three way reconciliation every state bar requires, holds retainers as a per-client liability, books advanced client costs as an asset (not an expense), and posts every Clio or MyCase billing line to the right matter. 99.6% accuracy across 3.2M+ documents. $79 flat per month for unlimited matters and trust accounts.
By Damin Mutti, founder of Zera Books. Last reviewed 2026-05-20.
Why law firm books break generic accounting software
The ABA Model Rule 1.15 on safekeeping property and every state bar version of it demand that client trust funds be segregated, reconciled per client, and never commingled with firm operating money. QuickBooks and Xero were built for one business with one revenue stream. A law firm has two banks (operating and IOLTA), two ledgers (firm books and per-client trust ledger), and a regulator that audits the seam between them.
The fracture is the retainer. A $10,000 retainer is firm cash in the bank but it is the client's money on the ledger. Earn $2,400 of fees this month, you transfer $2,400 from IOLTA to operating, post $2,400 of revenue, and the client still has $7,600 sitting in trust owed back. Generic accounting tools have no native concept of this. Most solo and small firms either run two separate QuickBooks files (a headache the bar still does not love) or hand-keep a parallel spreadsheet that breaks on the first contingency settlement.
Five law firm bookkeeping problems no generic tool solves
Every firm past their second active matter hits all five. Three of them are bar discipline risks. The other two are tax return risks.
IOLTA trust accounting is non negotiable and easy to break
Every state bar requires a three-way reconciliation of the trust account: bank balance, book balance, and the sum of client ledger balances must agree every month. A $5 fee debited from IOLTA to operating is a bar violation. Generic accounting software has no concept of a per-client trust ledger and will let you commingle by accident.
Retainers are not revenue when received
A $10,000 retainer deposited into IOLTA is a liability owed back to the client, not legal fee revenue. Revenue only recognizes when fees are billed against the retainer and earned. Booking the whole retainer as income on deposit overstates revenue, accelerates tax, and gets the firm sideways with the bar on the next examination.
Advanced client costs are an asset, not an expense
Filing fees, expert reports, deposition transcripts, and court reporter invoices the firm pays on behalf of a client are reimbursable. The IRS treats them as a loan to the client (an asset) under Section 162 case law. Books that expense them inflate deductions, then double count revenue when the client pays back, which is the exact pattern auditors target.
Contingency settlement statements have 8 to 15 splits
A personal injury settlement check lands in IOLTA. Distribution splits: client share, medical liens, subrogation, advanced cost reimbursement, contingency fee per the engagement letter, co-counsel referral. Each line has a different bookkeeping treatment and the wrong split shows up on the firm 1099 to the client or breaks the trust ledger.
Practice area and matter profitability is invisible
A 4-attorney firm running family, estate, PI, and business litigation needs to know which practice area earns its keep. QuickBooks Online Plus caps classes at 5 and ignores time-by-matter entirely. Clio tracks time but not the cost of malpractice premium allocation, paralegal salary loading, or office rent per attorney. The real net per matter never gets calculated.
How Zera Books handles each one for law firms
IOLTA three way reconciliation, every month
Every trust deposit posts to Trust Liability tagged to the client and matter. The IOLTA bank statement reconciles to the book balance and to the client ledger sum, automatically. If the three sides do not match to the penny, Zera blocks the close until the variance is resolved. State bar examinations become a two-click PDF, not a two-week project.
Clio, MyCase, and CosmoLex billing export parsing
Drop the monthly Clio billing export, MyCase trust ledger, or PracticePanther matter report. Zera reads fee invoices, retainer deposits, retainer earnings transfers, and advanced cost reimbursements without templates. Each line posts to the correct GL account and the correct client matter. 99.6% extraction accuracy across 3.2M+ documents processed.
Retainer earnings and matter level revenue
When a fee bill is approved, Zera posts the matched journal entry: debit Trust Liability for the client, credit Operating Cash via the trust to operating transfer, credit Legal Fee Revenue tagged to practice area and billing attorney. The trust ledger always shows what is still owed back. The P and L always shows only earned fees.
Per practice area and per attorney P and L
Tag every revenue and expense line by practice area and billing attorney. Run a P and L by practice (PI vs estate vs business) or by lawyer. A solo with two paralegals can see whether the bankruptcy book pays for itself. A 4-attorney firm can see which partner is actually carrying the firm. $79 flat, unlimited tags, unlimited matters.
A law firm chart of accounts that actually fits
Zera ships a starter chart of accounts tuned for solo and small firms, with IOLTA structure built in. Pick it on signup or import your existing QuickBooks chart. Either way you get categories like:
- Trust: IOLTA bank, Trust Liability by client, Three way reconciliation control
- Revenue: Legal fees earned, Flat fee revenue, Contingency fees collected, Consultation fees
- Costs: Advanced client costs (asset), Costs reimbursed (clearing), Unreimbursed costs (expense)
- Personnel: Attorney salary, Paralegal salary, Of counsel, Contract attorney 1099, Benefits
- Research: Westlaw, Lexis Advance, Fastcase, PACER, CourtListener, treatise subscriptions
- Insurance and dues: Malpractice premium, State bar dues, MCLE, professional licenses
- Practice management: Clio, MyCase, PracticePanther, CosmoLex, Smokeball, Rocket Matter
- Office: Rent, utilities, office equipment, postage and certified mail, court filing fees
Pricing for law firms and solo attorneys
- Unlimited matters and clients
- Unlimited IOLTA trust accounts
- Unlimited users (your CPA included)
- 1 week to try, no card required
A solo running QuickBooks Online Plus plus a part-time bookkeeper spends $400 to $900 a month. CosmoLex bundles trust accounting and practice management at $99 to $159 per user per month, so a 4-attorney firm pays $400 to $640 just for the billing layer. PCLaw and Tabs3 carry annual license fees plus per-seat costs. Zera handles the categorization, IOLTA reconciliation, and posting workload at $79 flat with no caps on users or matters.
Annual delta vs CosmoLex for a 4-attorney firm: $3,852 to $6,732. Vs a part-time bookkeeper: $3,852 to $9,852. The trial proves it on your real Clio or MyCase data first.
What it looks like for a real 3 attorney firm
A three-attorney family law firm in Boston was running their books in QuickBooks Online Plus with a part-time bookkeeper at $650 a month. Retainers were getting posted straight to revenue. Advanced client costs (process server fees, expert witness invoices, deposition transcripts) were being expensed instead of capitalized as a client receivable. The IOLTA three way reconciliation was happening twice a year, the night before the bar renewal was due.
They moved to Zera Books on a Tuesday. By the following Monday, twelve months of Clio billing exports, IOLTA bank statements, operating bank statements, and 47 expert witness invoices had been parsed. Retainers of $148,200 that had been mis-booked as income moved into Trust Liability tagged to 31 active matters. Advanced costs of $36,800 moved out of expense and into the client receivable asset. The corrected P and L showed legal fee revenue 22% lower than QuickBooks claimed (because retainers were no longer counted) and net income up because the cost basis was right.
Numbers that mattered: a clean three way IOLTA reconciliation done in 8 minutes every month instead of 4 hours twice a year, a corrected tax return prep that saved $11,400 in overstated income, per-attorney P and L that flagged the litigation partner's book as actually the most profitable (the firm had assumed otherwise), and a bar audit prep window that went from two weeks to two clicks.
“Half my law firm clients had retainers booked as revenue and advanced costs expensed. Zera fixed both on intake and now the IOLTA three way reconciliation closes the same day the bank statement drops. I do not lose a weekend before every bar renewal.”
Law firm AI bookkeeping questions
The questions solo attorneys and small firms actually ask before switching. For the broader picture see the full AI bookkeeping guide or the automated reconciliation deep dive.
- Does Zera Books handle IOLTA trust accounting?
- Yes. Every IOLTA deposit posts to a Trust Liability account tagged to a specific client and matter. The IOLTA bank account is reconciled to the three-way trust reconciliation that state bar rules require: bank balance, book balance, and the sum of client ledger balances must agree to the penny every month. Zera flags any mismatch before you sign off.
- Does Zera integrate with Clio, MyCase, PracticePanther, or Smokeball?
- Today Zera ingests the monthly trust ledger, operating ledger, and billing export from Clio, MyCase, PracticePanther, Smokeball, Rocket Matter, and CosmoLex. Drop the PDF or CSV and Zera posts trust deposits, retainer earnings, advanced client costs, and fee revenue to the right ledger by matter. Direct API sync with Clio and MyCase is on the 2026 roadmap.
- How does Zera split a retainer between trust and earned revenue?
- A retainer deposit lands in Trust Liability tagged to the client. As fees are billed and approved, Zera posts a transfer: debit Trust Liability for the client, credit Operating Cash, and credit Legal Fee Revenue. The trust ledger always shows what is owed back to the client and the P and L always shows only earned revenue. No commingling, no surprise audit findings.
- Can I track profitability per practice area or per attorney?
- Yes. Every revenue and expense line can be tagged to a practice area (family, personal injury, estate, business litigation) and to a billing attorney. The P and L runs per practice area, per attorney, or for the whole firm. A 4-attorney firm can finally see whether the PI book is subsidizing the estate book.
- How are advanced client costs handled?
- Filing fees, expert witness fees, deposition transcripts, and court reporters paid by the firm on behalf of a client post to Advanced Client Costs (an asset), not expense. When the client is billed for reimbursement, the asset clears. Booking these as expense overstates deductions and triggers IRS Section 162 problems on audit. Zera enforces the right treatment automatically.
- How does Zera handle contingency fees?
- A settlement deposit lands in IOLTA tagged to the case. On distribution, Zera posts: client share to client, advanced cost reimbursement to the firm asset clearing, attorney fee per the contingency percentage to operating cash and revenue, and lien payments to the relevant medical or subrogation creditors. The settlement statement reconciles to the books down to the penny.
- What about cash basis vs accrual for a small firm?
- Most firms under $26M run cash basis per IRS rules. Zera supports both and switches reports between cash and accrual at a click. Bills you have not collected sit in AR for the accrual view, but cash basis income recognizes only when funds clear. Year-end tax returns and bar dues reports can pull whichever method your accountant needs.
- How does pricing compare for a solo attorney or small firm?
- A solo running QuickBooks Online plus a part-time bookkeeper spends $400 to $900 a month. CosmoLex bundles trust accounting into practice management at $99 to $159 per user per month, so a 4-attorney firm is at $400 to $640 just on billing. Zera is $79 flat with unlimited users, unlimited matters, and unlimited trust accounts, and stays out of your billing workflow.
- Can my CPA review the books and the trust reconciliations?
- Yes. Unlimited users at $79 flat. Your CPA gets the journal entry, the three-way trust reconciliation, the matter-level P and L, and clean exports for the 1099 and K-1 cycle. Books posted by Zera, reviewed by your CPA, ready for bar audits and tax filings.
- Will Zera help with state bar audits or random IOLTA examinations?
- Yes. The three-way reconciliation, client ledger detail, and historical trust transactions export to PDF at any month-end. Most state bars require the firm to retain seven years of trust records; Zera holds them indefinitely so the audit prep is two clicks rather than two weeks.
- What document types can I drop in from a typical law firm?
- Operating bank statements, IOLTA bank statements, credit card statements, vendor invoices, court filing receipts, expert witness invoices, deposition transcripts, and Clio or MyCase billing exports. Zera processes bank statements, financial statements, invoices, and checks with no template training and 99.6% accuracy across 3.2M+ documents.
- How fast can a solo attorney close the month?
- Most solo and small firms close within 4 business days once Zera is running. The first month takes about a week while the trust ledger structure gets verified and matter tagging gets dialed in. After that, recurring vendors (Westlaw, Lexis, malpractice carrier, bar dues, office rent) auto-categorize and you review exceptions only.
IOLTA and trust safekeeping rules referenced from the ABA Model Rule 1.15 and IRS treatment of advanced client costs from IRS Section 162 guidance. Pricing benchmarks from public Intuit data for 2026.
Related guides
Try Zera Books for your law firm
One week to drop in your last 12 months of operating and IOLTA bank statements, Clio or MyCase billing exports, and any expert or court filing invoices. See a real three way trust reconciliation, real retainer liability, and real matter level profit. No card up front. $79 flat after.