What happens when my MLP cost basis reaches zero?

Once your MLP cost basis reaches zero, every subsequent cash distribution is immediately taxable as capital gain under IRC §731(a)(1). The tax-deferred treatment ends. You still receive the same cash amount — but you now owe tax on it in the year received.

Are MLP distributions taxable after basis reaches zero?

Yes. When adjusted basis is zero, distributions that exceed basis are recognized as gain under IRC §731(a). This gain is capital gain (long-term if held over one year), not ordinary income. The rate is 0%, 15%, or 20% depending on your taxable income.

Should I sell my MLP when basis hits zero?

Not necessarily. Zero basis changes tax treatment on distributions but doesn't change investment fundamentals. Many investors continue holding, buy more units to restore basis, or plan to hold until death for the stepped-up basis. Run the full sell analysis including §751 recapture before deciding.

Can my MLP basis go below zero?

No. Partnership basis cannot go below zero. When distributions would push basis below zero, the excess is recognized as gain under §731(a). Basis stays at zero; the excess triggers taxable gain.

What is phantom income from an MLP?

Phantom income occurs when your K-1 shows positive taxable income (Box 1) but your basis is already at zero. You owe tax on that allocated income even though it doesn't correspond to additional cash. More common with CQP and fuel distribution MLPs.

Does the stepped-up basis still work if my basis is zero?

Yes. Under IRC §1014, heirs receive a stepped-up basis to fair market value regardless of the decedent's adjusted basis. If your basis is $0 and units are worth $30,000, heirs' basis resets to $30,000.

MLP Basis Hits Zero: What Happens Next (§731)

When your MLP cost basis reaches zero — from years of return-of-capital distributions exceeding income allocations — every distribution after that becomes immediately taxable as capital gain under IRC §731(a). Your tax-deferred ride is over. But reaching zero basis doesn't mean you should sell.

By Lucas Andersen — Last updated March 6, 2026

How Basis Reaches Zero

Your MLP cost basis starts at what you paid. Every year, K-1 adjustments — distributions (Box 19A), ordinary losses (Box 1), and liability decreases (Item K) — reduce it. Income allocations and liability increases add basis back, but for most MLPs the net annual effect is negative. Pipeline MLPs typically reach zero in 7–15 years; royalty MLPs in 3–5 years.

The §731(a) Trigger

IRC §731(a)(1): a partner recognizes gain to the extent cash distributions exceed adjusted basis. Once basis = $0, every dollar of distribution is taxable as capital gain (long-term if held >1 year). This is NOT ordinary income — it’s capital gain at 0/15/20%. Basis cannot go below zero.

What Changes and What Doesn’t

Changes: Distributions become immediately taxable. Your annual tax bill increases significantly. Doesn’t change: You still receive the same cash distribution. Suspended passive losses keep accumulating. §751 recapture exposure continues to build. The stepped-up basis at death still works.

Worked Example: EPD at Zero Basis

500 units purchased at $20 ($10,000) in 2012. After 13 years of distributions and K-1 adjustments, basis reaches $0 in 2025. 2026 distribution: ~$2.10/unit × 500 = $1,050. With zero basis, all $1,050 is LTCG. Tax at 15%: $157.50. Compare to the prior 13 years where $0 was owed annually on ~$13,650 in tax-deferred distributions.

Your Five Options at Zero Basis

A) Buy more units — adds fresh basis, extends tax deferral. B) Keep holding — accept the tax, keep collecting. C) Sell — triggers §751 + capital gain, releases suspended losses. D) Hold until death — stepped-up basis eliminates everything. E) Donate — FMV deduction, zero gain recognition.

The Phantom Income Problem

At zero basis, positive Box 1 income creates “phantom income” — taxable income with no corresponding cash. Combined with §731 gain on distributions, zero-basis holders can face surprisingly large tax bills in strong MLP years. More common with CQP and fuel distribution MLPs (SUN, CAPL).

Stepped-Up Basis at Death — Why zero basis becomes irrelevant for heirs
Section 751 Recapture — The ordinary income surprise when you sell
§199A QBI Deduction — 20% tax break on qualified MLP income
How Distributions Erode Your Basis
EPD K-1 Guide
K-1 Basis Tracker — Track when your basis reaches zero