Trust Accounting Rules Decide Your Law Firm's ERP First

Commingling client trust funds with firm operating funds is a bar-discipline issue in nearly every state, not just an accounting preference. Whatever system you choose has to support separate trust and operating ledgers, with a three-way reconciliation, bank balance, book balance, and client ledger balance, that can be run and reviewed regularly. Neither NetSuite nor Sage Intacct is a dedicated legal trust accounting product out of the box, so this structure has to be deliberately configured, typically alongside a practice management system that handles matter-level trust ledgers and feeds summary totals into the general ledger.

Confirm your specific state bar's trust accounting requirements with your ethics counsel before finalizing any chart-of-accounts design, since reconciliation frequency and reporting format requirements vary by jurisdiction.

Before touching either platform, document every trust account you currently hold, how each one is reconciled today, and where that reconciliation currently breaks down. Most firms find the actual gap isn't the ledger software, it's an inconsistent process for recording retainer draws and cost advances at the matter level. Fix the process on paper first, then design the chart of accounts to enforce it.

Include every attorney who currently touches trust transactions in this mapping exercise, not just the bookkeeper. A retainer drawn down inconsistently by different attorneys, some recording it the day work is performed, others waiting until month-end, is a common source of reconciliation drift that has nothing to do with which system you're running.

Work through the separation on paper in this order:

1. List every trust account the firm holds today, including the bank, the account purpose and who is responsible for it.
2. Document how each account is reconciled now, and note exactly where that reconciliation breaks down or gets skipped.
3. Standardize how retainer draws and cost advances are recorded at the matter level before any system is configured.
4. Design the chart of accounts so trust and operating funds sit in separate ledgers that never touch.
5. Confirm the finished design with ethics counsel against your state bar's reconciliation rules.

A commercial law firm with corporate, litigation, and transactional practice groups needs to see profitability by group, by partner, and by matter type at the same time, since those groups often carry very different margin profiles under the same roof. Sage Intacct's dimensional structure handles that tagging directly and tends to be the faster implementation for a single-office or two-office firm. Realization, the gap between standard hourly rates and what actually gets billed and collected, needs the same multi-dimensional view, since a practice group can look busy on paper while realization quietly erodes underneath.

Firms operating across multiple states sometimes structure separate professional entities for licensing reasons, and that's the clearest trigger for NetSuite's multi-subsidiary consolidation over Sage Intacct's lighter multi-entity handling. A single-entity firm with multiple offices under one bar registration typically doesn't need that depth and can run well on Sage Intacct's dimensional tagging by office instead.

Receivables days are worth their own scrutiny regardless of which platform you choose, since law firms often run longer receivables days than other professional services do, and neither system fixes a collections process nobody owns¹.

Beyond the multi-entity case, NetSuite becomes the stronger fit once a firm has enough scale that procurement, vendor management, and firm-wide budgeting across many cost centers start to matter as much as matter-level billing. That's a genuinely different operational profile than most single-office and two-office practices carry, and paying for that depth before you need it is a real cost with no matching benefit.

Filing fees, expert witness costs, and court reporter charges advanced on a client's behalf need their own tracking separate from firm operating expense, both so you can bill them back accurately and so they don't distort your actual overhead picture. A system that treats every advanced cost as a generic expense line makes it hard to tell how much of your spend is truly the firm's versus money you expect to recover from a client. Both platforms can track this with a dedicated cost-advance account and matter-level tagging, but it has to be set up deliberately rather than left to whatever the default expense categories happen to be.

This matters more than it looks like on paper: a firm that loses track of client cost advances is effectively giving clients an interest-free loan on top of whatever payment terms are already generous, compounding the receivables gap discussed above.

Have each vendor demonstrate a full matter lifecycle using your own billing structure: a retainer draw, a cost advance, a monthly invoice, and a trust-to-operating transfer once fees are earned. Confirm in writing how the demonstrated structure satisfies your specific state bar's trust accounting rules, and get that confirmation from your own ethics counsel independently rather than taking the vendor's word for it.