48 C.F.R. § 9.406-2
The suspending and debarring official may debar—
(a) A contractor for a conviction of or civil judgment for—
(1) Commission of fraud or a criminal offense in connection with—
(b)
(1) A contractor, based upon a preponderance of the evidence, for any of the following—
(i) Violation of the terms of a Government contract or subcontract so serious as to justify debarment, such as—
(ii) Violations of 41 U.S.C. chapter 81, Drug-Free Workplace, as indicated by—
(v) Delinquent Federal taxes in an amount that exceeds the threshold at 9.104-5(a)(2).
(A) Federal taxes are considered delinquent for purposes of this provision if both of the following criteria apply:
(1) The tax liability is finally determined. The liability is finally determined if it has been assessed. A liability is not finally determined if there is a pending administrative or judicial challenge. In the case of a judicial challenge to the liability, the liability is not finally determined until all judicial appeal rights have been exhausted.
(2) The taxpayer is delinquent in making payment. A taxpayer is delinquent if the taxpayer has failed to pay the tax liability when full payment was due and required. A taxpayer is not delinquent in cases where enforced collection action is precluded.
(B) Examples. (1) The taxpayer has received a statutory notice of deficiency, under I.R.C. § 6212, which entitles the taxpayer to seek Tax Court review of a proposed tax deficiency. This is not a delinquent tax because it is not a final tax liability. Should the taxpayer seek Tax Court review, this will not be a final tax liability until the taxpayer has exercised all judicial appeal rights.
(2) The IRS has filed a notice of Federal tax lien with respect to an assessed tax liability, and the taxpayer has been issued a notice under I.R.C. § 6320 entitling the taxpayer to request a hearing with the IRS Office of Appeals contesting the lien filing, and to further appeal to the Tax Court if the IRS determines to sustain the lien filing. In the course of the hearing, the taxpayer is entitled to contest the underlying tax liability because the taxpayer has had no prior opportunity to contest the liability. This is not a delinquent tax because it is not a final tax liability. Should the taxpayer seek tax court review, this will not be a final tax liability until the taxpayer has exercised all judicial appeal rights.
(3) The taxpayer has entered into an installment agreement pursuant to I.R.C. § 6159. The taxpayer is making timely payments and is in full compliance with the agreement terms. The taxpayer is not delinquent because the taxpayer is not currently required to make full payment.
(4) The taxpayer has filed for bankruptcy protection. The taxpayer is not delinquent because enforced collection action is stayed under 11 U.S.C. 362 (the Bankruptcy Code).
(vi) Knowing failure by a principal, until 3 years after final payment on any Government contract awarded to the contractor, to timely disclose to the Government, in connection with the award, performance, or closeout of the contract or a subcontract thereunder, credible evidence of—
[48 FR 42142, Sept. 19, 1983, as amended at 54 FR 4968, Jan. 31, 1989; 54 FR 19815, May 8, 1989; 55 FR 21707, May 25, 1990; 59 FR 11372, Mar. 10, 1994; 61 FR 2633, Jan. 26, 1996; 61 FR 41473, Aug. 8, 1996; 61 FR 69291, Dec. 31, 1996; 68 FR 28080, May 22, 2003; 69 FR 34230, June 18, 2004; 73 FR 21798, Apr. 22, 2008; 73 FR 67091, Nov. 12, 2008; 79 FR 24199, Apr. 29, 2014; 80 FR 38296, July 2, 2015; 84 FR 19845, May 6, 2019; 85 FR 40067, July 2, 2020; 86 FR 3679, Jan. 14, 2021; 89 FR 30237, Apr. 22, 2024; 90 FR 513, Jan. 3, 2025]