26 USC § 6203
Method of assessment
October 30, 2020
The assessment shall be made by recording the liability of the taxpayer in the office of the Secretary in accordance with rules or regulations prescribed by the Secretary. Upon request of the taxpayer, the Secretary shall furnish the taxpayer a copy of the record of the assessment.
Amendments
1976—Pub. L. 94–455 struck out "or his delegate" after "Secretary" wherever appearing.