A Journey Through Subchapter S / A Review of The Not So Obvious & The Many Traps That Exist For The Unwary: Part XIII – What Happens to a Shareholder’s Return When There Is an Error on the S Corporation Return?

Basic Rules

IRC § 6501(a) generally requires the IRS to assess tax within three (3) years after a tax return is filed by the taxpayer. 

There are two (2) notable exceptions to this rule under IRC § 6501(c) and (e), namely:

1. Under IRC § 6501(c), an unlimited assessment period exists in the case of a false or fraudulent return where the taxpayer has the intent to evade tax; and
2. Under IRC § 6501(e), a six (6) year period for assessment exists in the case where the taxpayer understates gross income by more than 25 percent, unless there is adequate disclosure on the taxpayer’s original tax return.

In the case of a shareholder of an S corporation, the analysis is generally conducted at the shareholder level.  In other words, the focus is on the shareholder’s tax return, and the issue is whether there is a problem with that return that would extend the limitation period for assessment.

As we know from the basic rules, absent fraud or an undisclosed substantial understatement of gross income, the limitation period for assessment is three (3) years.  Likewise, absent fraud, an undisclosed substantial understatement of gross income extends the limitation period for assessment to six (6) years.