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Distributions and the Return of Capital Mechanism

MLPs do not pay dividends. Instead, they make cash distributions governed by their partnership agreements, which typically mandate the distribution of all available cash flow. Because midstream infrastructure assets incur massive depreciation and amortization expenses, the taxable ordinary income allocated to partners is significantly lower than the physical cash distributed.

The tax characterization of these distributions is split into two components:

Ordinary Income: The portion of the cash distribution that represents your share of the partnership’s net taxable income. This is taxed immediately at your marginal ordinary income rate.
Return of Capital (ROC): The portion of the cash distribution that exceeds the partnership’s taxable income. This component is completely tax-deferred. Instead of being taxed in the year received, ROC distributions reduce your cost basis in the MLP units. Taxes are deferred until you sell the position.

Historically, 80% to 90% of an MLP’s annual cash distribution is shielded as return of capital, making them highly cash-efficient for high-bracket investors. However, if your continuous basis reductions grind your cost basis down to zero, all subsequent distributions are taxed immediately as capital gains.

Deferral is not exemption — and yield is not return. Get this straight before anyone sells you an MLP on its headline distribution, because the entire sales pitch for the asset class rests on blurring it. A distribution that is 80% return of capital is 80% your own money being handed back, reducing your basis dollar for dollar. Write the underlying economics clearly: if you paid $P_{0}$ per unit, collect distributions $D_{t}$ of which a fraction $ρ$ is return of capital, and sell at $P_{T}$ after $T$ years, your adjusted basis is

B_{T} = P_{0} - ρ \sum_{t = 1}^{T} D_{t}

and your taxable gain on sale is $P_{T} - B_{T}$ — which includes every deferred dollar you already spent. A “10% yield” on a unit whose price is flat and whose distribution is mostly ROC is not a 10% return; it is partial liquidation plus a deferred tax bill. The total return is $(P_{T} + \sum D_{t} - P_{0}) ∕ P_{0}$ , and nothing else.

That does not make the deferral worthless — deferral at your cost of capital is genuinely valuable, and the step-up at death below can convert deferral into permanent exemption. It means the yield number on the marketing page is not the return number, and any pitch that presents the two as interchangeable is either careless or counting on you to be.

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