When economic substance becomes a litigation surprise

Economic substance has learned to wait.

The economic substance doctrine exists to stop transactions that comply with the Code but defeat its purpose.

Over time, that tool has shifted from a backstop to a latent threat. It now appears less as a predictable filter and more as a device that can surface late, even after careful planning and partial victories.

What happened?

Congress codified the economic substance doctrine in 2010.

§7701(o) requires two things when the doctrine is relevant. The transaction must meaningfully change the taxpayer’s economic position apart from tax effects. The taxpayer must also have a substantial non-tax purpose.

At the same time, Congress created a 20% penalty, increased to 40% in some cases, for transactions lacking economic substance. The penalty is strict liability. Reasonable cause does not apply.

In 2022, the IRS issued internal guidance removing the requirement for executive approval before exam teams could assert the doctrine and the penalty. The stated goal was to increase use where appropria…