### Question
How is the "underpayment" defined?


### Answer
The term **underpayment** is defined in *26 U.S.C. § 6242* as follows -

> the excess of any payment required under this section over the amount (if any) paid on or before the date prescribed therefor

#### Citation:
  - *26 U.S.C. § 6242*
  - Heading: **Subtitle F-Procedure and Administration > CHAPTER 63-ASSESSMENT > Subchapter D-Treatment of Electing Large Partnerships > PART I-TREATMENT OF PARTNERSHIP ITEMS AND ADJUSTMENTS**

