Business Aircraft Tax Planning: Avoid Million-Dollar Mistakes

The difference between smart business aircraft tax planning and costly mistakes can be measured in millions.

A potential client called me in a rush—his aircraft purchase was closing in just two weeks, and he wanted to minimize taxes. He already spoke with a tax professional, but not one specializing in aviation. As we discussed his business and intended aircraft use, it became clear our firm could add significant value: not only through tax savings, but also by ensuring compliance and reducing risk. I sent him an engagement letter immediately. He never signed it.

Even without being retained, I analyzed his situation. What I found was alarming: his plan to claim bonus depreciation was not only flawed, but potentially disastrous - setting him up for millions in avoidable taxes, penalties, and interest.

The Bonus Depreciation Mirage

Bonus depreciation allows businesses to deduct up to 100% of a business aircraft’s purchase price in the year the aircraft is placed in service. Bonus depreciation is a powerful tax planning tool and popular, but it does not apply in every situation. The rules surrounding bonus depreciation are a maze and can easily disqualify a taxpayer’s bonus depreciation claim if not navigated carefully.

In this case, the taxpayer’s facts suggested a high risk of IRS audit within three years. The IRS would likely recharacterize the taxpayer’s claimed “profits” as instead being “wages.” Without profits, the “excess business loss” limitation under IRC §461(l) is triggered and caps deductible losses at $512,000 in 2026 for joint filers. Any excess losses—like those generated by bonus depreciation—would be suspended and carried forward. The result? The taxpayer owes income taxes for the year he claimed bonus depreciation, plus penalties and interest. This could be avoided with a more tailored tax strategy.

A Safer Flight Plan

We would have advised a simpler, safer, and more cost-effective approach: skip bonus depreciation and instead depreciate the aircraft over five years using the Modified Accelerated Cost Recovery System (MACRS). This method would avoid the “excess business loss” limitation and still provide the taxpayer with meaningful deductions, but now without significant audit risk, time-consuming compliance headaches and unnecessary costs.

Expertise Matters

The taxpayer’s tax advisor focused solely on bonus depreciation deductions without considering how the taxpayer’s specific facts interacted with the broader tax code. Could the taxpayer avoid an IRS audit? Possibly but unlikely. And when the IRS comes, it will not matter that tax advice came from a well-meaning professional. The taxpayer bears the consequences.

Aircraft tax planning is not the place for shortcuts or generalist advice. The stakes are measured in millions, and the rules are far too complex to gamble with. Bonus depreciation can be a powerful tool, but when misapplied it becomes a liability—triggering audits, penalties, and unnecessary costs. The smarter path is clear: work with an aviation tax professional who can design a strategy that withstands IRS scrutiny and protects your investment. In business aviation, good planning isn’t optional—it’s the difference between flying high with savings or crashing into avoidable losses.

Gary represents private and commercial aircraft owners, operators and lessors in structuring the sale, acquisition, ownership and operation of aircraft, and provides federal tax and state sales and use tax planning services. Gary is a Member of HCH Legal, LLC and can be reached at ghorowitz@hchlegal.com.