The assessment statute asks whether the IRS acted in time to record additional tax. It is distinct from section 6502, which generally governs how long an assessed liability may be collected.
What the authority does
Section 6501 establishes a general three-year assessment period and contains many exceptions and special rules, including longer periods for substantial omissions and no ordinary limitation period for a false or fraudulent return with intent to evade tax or for failure to file a return.
Why it matters in a tax controversy
A limitations analysis begins with the return actually filed, the legal filing date, signature and validity, extensions, later amended returns, audit consents, and the type of adjustment. The same tax year can contain issues governed by different special provisions.
What it does not answer by itself
The general three-year shorthand does not answer every case. Partnership, foreign-information, listed-transaction, employment-tax, and other rules may alter the period, and a voluntary extension must be read by its terms.
Research and case checkpoints
- Locate the filed return and reliable evidence of its filing date.
- Determine whether the return was legally valid for starting the limitation period.
- Identify omitted-income, fraud, nonfiling, foreign-information, and special-tax issues.
- Review every consent extending assessment and the issues or periods it covers.
Primary and official sources
Currency note: Check the current text, amendment history, effective date, and the version governing the tax period or agency action before relying on this summary.