§ 20.6601-1. Interest on underpayment, nonpayment, or extensions of time for payment, of tax.
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/us/cfr/t26/s§ 20.6601-1·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
For regulations concerning interest on underpayments, etc., see § 301.6601-1 of this chapter (Regulations on Procedure and Administration).