53 Pa. Stat. § 12720.406
Prior to each authorization of tax anticipation notes, the director of finance of the city shall make an estimate of the moneys to be received during the period when such notes will be outstanding from taxes then levied and assessed, and revenues, including, without limitation, subsidies or reimbursements to be received. Such estimate shall take due account of the past and anticipated collection experience of the city and of current economic conditions. The estimate shall be certified by the director of finance, and the written certificate of the director of finance, dated as of a date not more than 30 days prior to the date of the authorization of the notes, shall be filed with the proceedings authorizing the tax anticipation notes with the fiscal agent, sinking fund depositary, trustee or paying agent for the notes or the authority, as provided in section 408 of this act.
53 P.S. § 12720.406