By Maria Halmo
If you're a U.S. taxpayer, chances are you've used a handy online calculator to estimate the dollar impact of the new tax bill on your paycheck. Unfortunately, we haven't been able to find or build the equivalent calculator for MLP investments. Instead, here are the high-level takeaways for MLPs, which importantly maintain their tax advantage over corporations.
Lowered Corporate Tax Rate:
When the first initial drafts of the tax bill lowered the corporate rate below that of the federal personal income tax rate, the MLP community started to get a little anxiety. Yes, paying zero percent in federal taxes is still better than paying any higher percentage, but investors aren't focused only on the rate charged to the company. Smart investors are worried about how much of a company's total net operating income will be taxed by the time that money reaches the end investor. That includes how much dividends or distributions are taxed. Thankfully, the final bill included an amendment that maintains the MLP tax advantage over a corporation.
While the overall tax benefit to using the MLP structure has decreased from 8.4% to 7.2% , the costs of investing in MLPs remain the same: namely, filing schedule K-1s. This creates an additional accounting burden on the end investor and shrinks the pool of investors willing to invest, which hurts the company. Additionally, since partnerships are not included in the S&P 500, there are billions in linked assets that MLPs cannot access.
The tax advantage of organizing as an MLP remains, but the benefit is not quite as big as it used to be. Existing MLPs are unlikely to be tempted to change structures. While it might grant access to a larger pool of investors, it could potentially trigger an enormous tax bill for existing investors (a few of whom are in management positions). However, new companies thinking about becoming public may now have less incentive to use the MLP structure. The number of MLP IPOs may be fewer in the coming years  than in past years.
Under the old model, MLPs (and other companies) could immediately depreciate 50% of the value of property. This will be increased to 100% for property placed into service in the next five years. After the five-year period, the bonus depreciation percentage is gradually phased down for properties placed into service during the years 2023 - 2026. Plus, the company doesn't even have to build the asset itself to take advantage. The bonus depreciation is available even for acquired property, as long as it's the company's first time using it. Notably, this bonus is not available to utilities.
While MLPs are always prolific builders of assets, they only very rarely speculatively build assets, so the likelihood of this change resulting in an overbuild of energy infrastructure is small. More likely, this change will enhance the project viability math, and projects that were previously only modestly profitable (or break even) might get built.
Interest Expense Deduction Limitation
Previously, large businesses, including MLPs, were able to fully deduct interest expense. Beginning in 2018, interest expense deductibility is now capped at 30% of adjusted taxable income . The limitation does not apply to Utilities, which will be able to deduct 100% of interest expense.
If the deduction proves to be more than the 30% limitation, it can be carried forward to future years (essentially lowering the cost basis). If the company is sold in the meantime, the deduction can be added back to the basis, so essentially, you never miss out on it.
Repeal of Technical Termination
These rules were a bit esoteric to start with. If 50% or more of a partnership was sold or exchanged, the publicly traded partnership (aka the MLP) would be treated as newly formed. This produced a very minor risk. After all, MLP units do trade in the open market, so there was always a possibility of triggering this rule.
Mostly, it will just simplify things for MLPs. Less lawyerly language in the SEC filings. Fewer subsidiaries when completing a transformative transaction. Now, MLPs will have more flexibility for their restructurings or reorganizations.
The uncertainty around tax reform and whether MLPs would continue to enjoy a tax advantage over corporations was likely an overhang on MLP units towards the end of last year, particularly in November. The tax reform question has now been settled, and investors are still able to enjoy the tax-deferred return of capital benefit that MLPs provide. Overall, tax reform hasn't dramatically altered the MLP investment decision.
 All numbers are calculated without including the 3.8% Medicare tax. Including Medicare the MLP advantage falls to 7.1% in 2017 and 6.6% in 2018.
 Standard reminder that the reduced individual tax rate and 20% MLP deduction are currently going to sunset after 2025, although the C corporation rate will not. In the past, additional legislation has been passed to extend lower tax rates and it may or may not happen again. A risk remains that after 2025, C corporations will have a lower effective tax rate than MLPs.
 In 2022, interest deductibility becomes more restricted as depreciation, amortization and depletion will be subtracted in the calculation of adjusted taxable income.
Disclosure: © Alerian 2018. All rights reserved. This material is reproduced with the prior consent of Alerian. It is provided as general information only and should not be taken as investment advice. Employees of Alerian are prohibited from owning individual MLPs. For more information on Alerian and to see our full disclaimer, visit http://www.alerian.com/disclaimers.
Maria Halmo is the Director of Research at Alerian, which equips investors to make informed decisions about Master Limited Partnerships (MLPs) and energy infrastructure. Ms. Halmo leads the firm's research efforts, which include examining MLP regulatory filings, monitoring legislative activity, and investigating industry developments. She also oversees Alerian's public communications strategy through investor and media outreach. Ms. Halmo is a former Associate at SteelPath Capital Management LLC, a Dallas-based MLP investment manager, where she conducted valuation analyses of petroleum transportation partnerships and researched macro-level energy issues. Ms. Halmo graduated with a Bachelor of Arts in Astrophysics from Barnard College at Columbia University. She is also a contributing author to Midstream Business, a monthly publication addressing the need for business market intelligence on North American energy infrastructure.