MLP 101

A master limited partnership (MLP) is a limited partnership whose interests (known as “units”) are traded on public exchanges, just like corporate stock. MLPs engage in active businesses, primarily in the energy industry. There are a number of publicly traded partnerships which are not active businesses and are instead investment funds in particular commodity pools; these are not considered MLPs.

A limited partnership has one or more general partners (i.e. individuals, corporations, or other partnerships) who manage the partnership; it also has limited partners, who provide capital to the partnership but have no role in its management. When an investor buys units in an MLP, he or she becomes a limited partner.

MLPs are formed in several ways: (a) nontraded partnership may decide to go public; (b) several nontraded partnerships may “roll up” into a single MLP; (c) a corporation may spin off a group of assets or part of its business into an MLP in which it retains an ownership interest, either to realize the assets’ full value on the marketplace or as an alternative to debt; (d) a corporation may fully convert to an MLP (however, since 1986, the tax consequences have made this an unappealing option for most); or (e) a newly formed company may operate as an MLP from its inception.

MLP Basics are MLPs?

MLPs (master limited partnerships) are publicly traded partnerships: limited partnerships which are traded on stock exchanges. A share in an MLP is called a “unit,” and owning MLP units makes you a limited partner. Sometimes an MLP is technically not a partnership but a publicly traded limited liability company (LLC) which has chosen partnership taxation. There are some differences between the two, but for tax purposes they are the same.

Why should I consider investing in MLPs?

In a time of insecurity in the stock markets, securities paying income can help mitigate the effect of fluctuating stock prices. MLPs are an income-oriented investment: their organizational mandate is to pay out all earnings not needed for current operations and maintenance of capital assets to their unitholders in the form of quarterly cash distributions. Many MLPs are also growth-oriented, striving to increase their distributions as often as is possible and prudent. In addition, MLPs are a tax-advantaged investment. As explained below, investors pay tax only on their proportionate share of the MLP’s income, which is greatly reduced by their share of deductions; distributions are tax-deferred. Finally most MLPs are in essential industries, providing energy and energy infrastructure, for which demand is likely to continue and increase.

What kinds of companies operate as MLPs?

Due to the requirements of the tax code, the great majority of MLPs—about 80 percent by number, representing close to 90 percent of MLP market capital–are in energy-related businesses. The largest number of MLPs is in the midstream sector which gathers, processes, transports, and stores oil, natural gas, and refined petroleum products. There are also MLPs engaged in the production of oil and natural gas, distribution of propane and other refined products, coal leasing and mining, and marine transportation of petroleum products. In addition, there are some publicly traded partnerships in the investment industry and in various other businesses.

How are MLP units different from corporate stock?

The big difference is in how MLPs and their investors are taxed. Unlike corporations, MLPs and other partnerships are not considered as separate entities for tax purposes. Rather, MLPs and other partnerships are “pass-through” entities. No tax is paid at the partnership level; partnership income passes through and is taxed only at one level – that of the individual partner. Since deductions such as depreciation and depletion are also passed through to individual partners, taxable income is often quite low. Most MLPs make quarterly distributions to their partners that will significantly exceed any tax owed.

What does that mean for MLP investors?

Since the MLP itself does not pay tax, it is able to pass along more of its earnings to its investors than a corporation. It does this in the form of quarterly cash distributions. From a tax standpoint these distributions are treated more favorably than corporate dividends. Rather than taxable investment income, the amount of distributrion beyond net income is considered to be a return of capital and reduces the partner’s basis in the partnership units. The partner will not be taxed on these amounts until the MLP units are sold and tax paid on the gain, including distributions, or when the basis reaches zero.

What happen when units are sold?

When the units are sold, the difference between the sales price and the adjusted basis equals the taxable gain (or loss). Some of the tax on the capital gain from selling the interest will be taxed at the capital gains rate. That portion of the gain that results from a downward adjustment of the basis after allocation of depreciation or depletion deductions will be taxed at the ordinary income rate.

What is a K-1? Will it delay my tax filing?

The K-1 form is the document an MLP investor will receive during tax season showing the investor’s share of each item of partnership income, gain, and loss, deductions, and credits. The K-1 provides the information necessary for an investor’s tax return. MLP investors receive this form instead of the 1099. While K-1’s cannot be made available in January as is done with the 1099, MLPs work hard to provide the K-1 on a timely basis. Usually an investor can download the K-1 from a company website in time to meet tax filing deadlines.

Can I hold MLPs in my IRA?

Yes, but MLPs may not represent the best investment for a retirement plan. First, an MLP offers significant tax benefits that are better utilized in a taxable account. Secondly, an IRA (or any tax-exempt entity earning income from an outside business) is subject to the “unrelated business income tax” (UBIT) after the first $1,000 of net income from a business that is unrelated to its exempt purpose (unrelated business taxable income, or UBTI). Since an MLP is a pass-through entity, the IRA would be considered to be “earning” the MLP’s business income, which is almost always considered to be unrelated to the IRA’s exempt purpose. If the IRA’s UBTI from all sources is over $1,000, the fund custodian will have to file a return and pay tax on the excess out of the IRA’s funds. Most advisors feel that unless there is reasonable certainty that the net income received from MLPs will be less than $1,000 each year, it is better not to hold them in an IRA. This is equally true of regular and Roth IRAs.

How can I or my retirement plan invest in MLPs without the tax hassle?

There are several closed-end mutual funds and a few open-end funds that concentrate on MLPs. If you invest through one of these funds, they will deal with the tax issues of being a limited partner and pass the income they receive from the MLPs on to you or your retirement account as a dividend, some of which will be treated as return of capital. You will receive a 1099 form instead of a K-1. The downside is that you will not get the full tax benefits of direct investment in an MLP, and some of the income will be retained by the fund for fees and expenses.

This fact sheet is for informational purposes only and should not be construed as offering tax or investment advice. Consult the appropriate advisor regarding your own situation.


Are PTPs the same as MLPs?

Both are publicly traded business entities which have chosen to be treated as a partnership under the tax laws; however, they are not quite the same thing. Not all PTPs are considered MLPs. The term “master limited partnership, ” or MLP is generally used to refer to those PTPs that operate active businesses, generally in energy or natural resources. It refers to a tiered limited partnership structure (i.e., a general partner manages the partnership and limited partners contribute capital) in which operations are conducted by lower-tier partnerships or other subsidiaries held by the publicly traded, “master” limited partnership. Not all MLPs are limited partnerships–some are actually publicly traded limited liability companies (LLCs) that have chosen to be taxed as partnerships. LLCs do not have a general partner, and investors have greater rights vis à vis management than in a limited partnership (see last question below).

Which companies can be MLPs?

Rules added to the tax code in 1987 require any partnership that is publicly traded to receive 90 percent of its income from specified sources. An MLP not meeting this test will be treated as a corporation for tax purposes (see below). Qualifying income for MLPs includes interest, dividends, real estate rents, gain from the sale or disposition of real property, income and gain from commodities or commodity futures, and income and gain from the exploration, development, production, mining, refining (including fertilizers), marketing and transportation (including pipelines), of minerals and natural resources, including oil and gas, depletable minerals, geothermal energy, and timber.

Most MLPs today are in energy-related businesses. For more specific legal references, please see the “MLP Laws and Regulations”page.

In 2008 as part of the Emergency Economic Stabilization Act (EESA) (P.L. 110-343), the qualifying income definition was expanded. MLPs can now earn income and gains from industrial carbon dioxide, and from the transportation and storage of alcohol and biodiesel fuel mixtures; various alternative fuels; neat alcohol not derived from alcohol, gas, or coal or having a proof under 190; and neat biodiesel.

At the time the 1987 rules were enacted, there were some PTPs already trading that did not have the right kind of income. These MLPs (known as the “grandfathered”MLPs) were given a transition period of ten years, until December 31, 1997, before they would have to either meet the test or be taxed as corporations. The Taxpayer Relief Act of 1997 extended this transition rule indefinitely for grandfathered PTPs electing to pay a small (3.5 percent) tax on their gross income from partnership business activities. About a dozen PTPs made this election; however, only two are still trading.

What is the difference between an MLP and a corporation?

A corporation is a distinct legal entity, separate from its shareholders and employees. The corporate entity carries the liability for all the obligations of the corporation; the shareholders contribute capital but have no liability to business creditors, tax authorities, litigants, or any of the numerous other parties, which may have a claim on corporate earnings and assets.

A corporation is treated as a separate entity for tax purposes as well. Like individual taxpayers, it must pay a tax on its income. After taxes are paid, some or all corporate income is retained at the corporate level and used for capital investment and other purposes. Some may be passed through to shareholders in the form of dividends, and the shareholders pay tax on the dividends they receive. For this reason, it is said that corporate income is “double-taxed,” or taxed at two levels.

An MLP, as a partnership, is not considered to be a separate entity, but rather is an aggregate of all the partners. All partners are liable for the obligations of the partnership; although limited partners enjoy limits on their liability, they are not fully shielded in the way shareholders are. Creditors generally have the right to seek return of capital distributed to a limited partner if the liability for which payment is sought arose before the distribution. This right survives the termination of a partner’s interest. Limited partners may also be liable for substantial tax liabilities that could be determined through the audit process long after they have sold their interest. As a practical matter, however, this is unlikely to happen to an MLP investor.

A partnership is referred to for tax purposes as a “pass-through” entity. No tax is paid at the partnership level. A partnership’s income is considered earned by all the partners; it is allocated among all the partners in proportion to their interests in the partnership, and each partner pays tax on his or her share of the partnership income. All the other items that go into determining taxable income and tax owed are passed through to the partners as well–capital gains and losses, deductions, credits, etc. Partnership income is thus said to be “single-taxed,” or taxed only at one level–that of the individual partner.

What does this mean for MLP investors?

Because the MLP itself does not pay tax, it is able to pass along more of its earnings to its investors than it could if it were in corporate form. It does this in the form of quarterly cash distributions. Although they resemble corporate dividends, MLP distributions are treated differently, and better, for tax purposes. Rather than taxable investment income, they are treated as a return of capital and reduce the partner’s basis in his partnership units. [The investor’s original basis is the price paid for the units. The basis is adjusted downwards with each distribution and allocation of deductions (such as depreciation) and losses, and upwards with each allocation of income.

When the units are sold, the difference between the sales price and the adjusted basis equals taxable gain (or loss). The partner will not be taxed on distributions until 1) he sells his MLP units and pays tax on his gain, which includes the distributions; or 2) his basis reaches zero. Some of the tax on the capital gain from selling the interest will be paid at the capital gains rate. That portion of the gain that results from a downward adjustment of the basis after allocation of depreciation or other deductions will be taxed at the ordinary income rate.

At tax filing season an MLP investor will receive a K-1 form showing his share of each item of partnership income, gain, loss, deductions, and credits. He will use that information to figure his taxable partnership income (PTPs provide their investors with material that walks them through all the steps). If the result is net income, the partner pays tax on it at his individual tax rate. If the result is a net loss, it is considered a “passive loss” under the tax code and may not be used to offset income from other sources, but must be carried forward and offset against future income from the same PTP.

It is important to note that an MLP investor is taxed on his share of partnership income whether or not he actually receives any cash from the partnership. His tax is based not on money he actually receives, but his proportionate share of what the partnership earns. However, most MLPs make it a policy to make quarterly distributions to their partners that will comfortably exceed any tax owed. For more information on investing in MLPs, please see the Investor Relations section of the website.

How does this affect my state taxes?

As a unitholder in an MLP, you will be subject to state income tax on your allocated share of partnership income in each state where the MLP has operations.  In practice, most MLP unitholders will owe little or no tax in any one state.  For more information, go to the State Taxation page.

What about institutional investors?

An important aspect of corporate vs. pass-through taxation is the way tax-exempt investors, such as IRAs and pension funds, are treated. Tax-exempt entities are subject to “unrelated business income tax” (UBIT) on income they earn from business activities unrelated to their exempt purpose. If a tax-exempt entity invests in an MLP, it will, like any partner, be considered to have “earned” its share of the partnership’s business income as if it were directly involved in the business. If that income is not one of the types that are exempted from UBIT (interest, rent, royalties, and dividends) the exempt organization will have to pay tax on its share of theMLP’s net income. This makes it much more difficult for MLPs to attract institutional investors than it is for corporations (note, however, that the first $1,000 of unrelated business income is not taxed, which may make it possible for a small holder such as an IRA to hold MLP units).

In addition, under the tax code, mutual funds must receive 90 percent of their income from qualifying sources such as interest and dividends. Until 2004, distributions and allocated income from a MLP would not have qualified, which discouraged mutual funds from investing in MLPs. In 2004, however, Congress enacted legislation, for which the Association had been working for several years, adding income from an MLP investment to the list of qualifying sources.

What is an LLC, and how can it be a PTP?

A limited liability company, or LLC, is a hybrid between the corporate and the partnership form that has been developed over the past several years. Investors in LLCs enjoy the limited liability associated with corporations, combined with the passthrough tax treatment of partnerships. The Internal Revenue Service and state tax authorities have specifically ruled that properly structured LLCs will be treated as partnerships for tax purposes if they so elect. LLC interests may be (and in some cases are) traded on public exchanges. When that is the case, an LLC which has elected partnership tax treatment is in effect a PTP, and is subject to the PTP rules of the tax code.