program in custodial cleaning or cleaning management provided by an entity that has demonstrated expertise in the field of cleaning, such as a distributor of cleaning products, cleaning product manufacturer, cleaning service provider, accredited training institution, industry-recognized trade association, or other non-profit entity. (4) Certification in cleaning The term certification in cleaning means an industry-recognized certificate in custodial cleaning or cleaning management provided by an entity that has demonstrated expertise in the field of cleaning such as a distributor of cleaning products, cleaning product manufacturer, cleaning service provider, accredited training institution, industry-recognized trade association or other non-profit entity. (5) Related persons (A) In general The taxpayer and all persons related to the taxpayer shall be treated as one person. (B) Relationship test A person is related to the taxpayer if the person bears a relationship to the taxpayer specified in section 267(b) or 707(b)(1), or the person and the taxpayer are engaged in trades or businesses under common control (within the meaning of subsections (a) and (b) of section 52). (d) Denial of double benefit No deduction shall be allowed under this chapter for any amount taken into account in determining the credit under this section. (e) Termination This section shall not apply to expenses paid or incurred after March 31, 2021. . (b) Credit made part of general business credit Subsection (b) of section 38 of such Code is amended by striking plus at the end of paragraph (32), by striking the period at the end of paragraph (33) and inserting , plus , and by adding at the end the following new paragraph: (34) the clean start back to work credit determined under section 45U. . (c) Clerical amendment The table of sections for subpart D of part IV of subchapter A of chapter 1 is amended by adding at the end the following new item: Sec. 45U. Clean Start Back To Work Credit. . (d) Effective date The amendments made by this