IRC §199A provides a 20% deduction on qualified MLP income — made permanent by the OBBBA. But PTPs have no W-2/UBIA safety valve, making the income threshold a hard cliff. Five-MLP worked example, 10-year compounding, and the unresolved §751 question.
By Lucas Andersen — Last updated April 9, 2026
Section 199A provides a 20% deduction on qualified business income from pass-through entities, including PTPs and MLPs. This is a deduction, not a credit: $1,000 of QBI becomes $800 of taxable income. At a 37% marginal rate, the effective rate on QBI drops to 29.6%. Found on K-1 Box 20, codes Z and AE. Made PERMANENT by the OBBBA (signed July 4, 2025).
Most §199A guides online are S-corp focused. They describe the W-2 wage test and UBIA test as safety valves for high-income filers. For PTPs, these safety valves do NOT exist. Under §199A(b)(2)(B), the PTP deduction is simply 20% of your allocable QBI — the W-2 wages the MLP pays its employees and the billions in pipeline assets it owns are irrelevant to your personal deduction.
This asymmetry matters: an S-corp owner above the threshold with $500,000 in W-2 wages can still claim up to $250,000 in §199A deductions. An MLP investor with the same income has no such floor. The income threshold is a hard cliff for PTP investors in a way it is not for S-corp owners.
Before the OBBBA, §199A was scheduled to sunset after 2025. This created a holding period calculus: long-term MLP projections had to model two scenarios. The OBBBA eliminated this uncertainty. The 20% deduction now compounds for the life of the hold — Year 1, Year 10, Year 30. For buy-and-hold MLP investors, this is a permanent structural benefit.
Single: ~$197,300 (phase-out begins) to ~$247,300 (fully phased out). MFJ: ~$394,600 to ~$494,600. Below the lower threshold: full 20% deduction. The threshold is based on taxable income (not AGI) — retirement contributions and itemized deductions reduce your number. Some investors who appear over the limit on gross income are actually below it.
K-1 Box 20, code Z = your QBI. Calculated on Form 8995 or 8995-A. Each PTP is calculated separately — cannot combine QBI from EPD and ET. QBI losses from one PTP carry forward within that PTP only.
MFJ, $300,000 taxable income, $120,000 MLP portfolio. EPD ($30K): $750 QBI. ET ($30K): $550 QBI. MPLX ($25K): $600 QBI. WES ($20K): $400 QBI. PAA ($15K): -$150 QBI (carries forward). Total deductible QBI: $2,300. Deduction: 20% × $2,300 = $460. Tax savings at 24%: $110/year. Over 10 years (now permanent): ~$4,600 in cumulative deductions, ~$1,100 in tax savings. At 37%: ~$1,700 over 10 years.
Yes. The §199A deduction is based on your allocable QBI from the K-1 — it has no connection to your outside basis. Even if your basis has reached zero and distributions are taxable under §731(a), the partnership still allocates QBI to you and you still claim the 20% deduction on that QBI.
Can §199A apply to §751 recapture income on sale? This is actively debated among tax practitioners. The argument for: §751 income is ordinary income from a qualified trade or business. The argument against: recapture income may not be “income earned in the ordinary course.” The IRS has not issued definitive guidance. Consult your tax advisor — do not assume the deduction applies or doesn’t.