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Tax & Accounting for Professional Service Firms

Professional service firms are specified service trades subject to 199A phase-outs, and owner compensation structuring matters even more than usual. Add trust accounting for law firms, method-of-accounting questions, and partner transitions, and the firm return becomes a planning document rather than a formality.

Katie Gorles
Written by
Katie Gorles
Updated July 6, 2026

199A phase-out planning

Law firms, accounting firms, consulting firms, and most professional services are SSTBs. The 20% QBI deduction fully phases out above the upper income thresholds, making income deferral and retirement plan contributions more valuable. For firm owners near the threshold, a well-timed retirement contribution can preserve a deduction the same dollars would otherwise erase.

Owner draws vs. guaranteed payments

Partnership structures use guaranteed payments (taxable as ordinary income) and regular distributions (capital account reductions). Mismatched compensation agreements create tax inefficiency across the partner group. The label on a payment changes self-employment tax, QBI math, and each partner's capital account, so the agreement should be written with the tax result in mind rather than patched at filing time.

Cash balance plans

High-income partners in small professional firms can contribute substantially to layered 401(k) + profit sharing + cash balance plans. The math often justifies the actuarial administration costs. Because contribution capacity climbs with age, these plans work especially well for senior partners within sight of transition, sheltering peak-earning years at the moment it matters most.

Cash vs accrual and unbilled work

Most professional firms under the gross-receipts threshold stay on the cash method, which keeps unbilled work-in-progress and accounts receivable out of taxable income until collected. Year-end billing decisions therefore move real tax dollars. Firms crossing the threshold need a managed method change rather than a surprise on next year's return.

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Trust accounting for law firms

Client funds in a trust account are not firm income until earned, and the bar rules on IOLTA accounts leave no room for casual bookkeeping:

  • Three-way reconciliation monthly: bank balance, trust ledger, and per-client ledgers
  • Earned fees moved to operating promptly and recognized as income when moved
  • Costs advanced for clients tracked as recoverable, not buried in expenses

Partner transitions and firm operations

Buy-ins, retirements, and lateral admissions each carry tax consequences for both the firm and the individual, from how the purchase price is characterized to how retiring-partner payments are treated. Day to day, Florida firms also budget for sales tax on the office lease and county tangible personal property tax on furnishings and equipment, two lines that out-of-state firms opening a Florida office rarely expect.

Common questions

Is the QBI deduction really lost above the threshold for our firm?
For SSTBs, yes, it fully phases out. Non-SSTB professionals (architects, engineers) keep the deduction with W-2 and UBIA limitations applied.
Can our firm stay on the cash method?
Most firms below the federal gross-receipts threshold can, and it's usually the right answer because unbilled work stays untaxed until collected. Firms growing past the threshold plan the method change in advance.
How are partner buy-ins taxed?
It depends on structure: buying a capital interest, receiving a profits interest, or purchasing from a retiring partner each produce different results for both sides. The characterization is negotiable before the deal and expensive to fix after.
Who handles our trust account reconciliation, you or our bookkeeper?
Either can, but someone must do it monthly and it has to be the three-way version the bar expects. We set up the ledgers and either maintain them or review your staff's reconciliation.

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