If an amount is paid out of the fund to an individual entitled to benefits under this part or part 727 of this subchapter (see § 725.4(d)) on behalf of an operator or other employer which is or was required to pay or secure the payment of all or a portion of such amount (see § 725.522), the operator or other employer shall be liable to the United States for repayment to the fund of the amount of benefits properly attributable to such operator or other employer.

If an operator or other employer liable to the fund refuses to pay, after demand, the amount of such liability, there shall be a lien in favor of the United States upon all property and rights to property, whether real or personal, belonging to such operator or other employer. The lien arises on the date on which such liability is finally determined, and continues until it is satisfied or becomes unenforceable by reason of lapse of time.

Except as otherwise provided under this section, the priority of the lien shall be determined in the same manner as under section 6323 of the Internal Revenue Code (26 U.S.C.).

In the case of a bankruptcy or insolvency proceeding, the lien imposed under this section shall be treated in the same manner as a lien for taxes due and owing to the United States for purposes of the Bankruptcy Act or section 3466 of the Revised Statutes (31 U.S.C. 191).

For purposes of applying section 6323(a) of the Internal Revenue Code (26 U.S.C.) to determine the priority between the lien imposed under this section and the Federal tax lien, each lien shall be treated as a judgment lien arising as of the time notice of such lien is filed.

For purposes of the section, notice of the lien imposed hereunder shall be filed in the same manner as under section 6323(f) (disregarding paragraph (4) thereof) and (g) of the Internal Revenue Code (26 U.S.C.).

In any case where there has been a refusal or neglect to pay the liability imposed under this section, the Secretary of Labor may bring a civil action in a district court of the United States to enforce the lien of the United States under this section with respect to such liability or to subject any property, of whatever nature, of the operator, or in which it has any right, title, or interest, to the payment of such liability.

The liability imposed by this paragraph may be collected at a proceeding in court if the proceeding is commenced within 6 years after the date upon which the liability was finally determined, or prior to the expiration of any period for collection agreed upon in writing by the operator and the United States before the expiration of such 6-year period. This period of limitation shall be suspended for any period during which the assets of the operator are in the custody or control of any court of the United States, or of any State, or the District of Columbia, and for 6 months thereafter, and for any period during which the operator is outside the United States if such period of absence is for a continuous period of at least 6 months.