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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.

Katie Gorles
Written by
Katie Gorles
Updated April 22, 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.

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.

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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.

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.

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