(1) De minimis exception.
Paragraphs (d)(1) and (d)(2) of this section do not apply to costs of issuance of any bond or to an amount not in excess of the lesser of $100,000 or 5 percent of the proceeds of the issue.
(2) Preliminary expenditures exception.
Paragraphs (d)(1) and (d)(2) of this section do not apply to any preliminary expenditures, up to an amount not in excess of 20 percent of the aggregate issue price of the issue or issues that finance or are reasonably expected by the issuer to finance the project for which the preliminary expenditures were incurred. Preliminary expenditures include architectural, engineering, surveying, soil testing, reimbursement bond issuance, and similar costs that are incurred prior to commencement of acquisition, construction, or rehabilitation of a project, other than land acquisition, site preparation, and similar costs incident to commencement of construction.
1.150-2 (g) Special rules on refundings --
(1) In general -- once financed, not reimbursed.
Except as provided in paragraph (g)(2) of this section, paragraph (d) of this section does not apply to an allocation to pay principal or interest on an obligation or to reimburse an original expenditure paid by another obligation. Instead, such an allocation is analyzed under rules on refunding issues. See section 1.148-9.
(2) Certain proceeds of prior issue used for reimbursement treated as unspent.
In the case of a refunding issue (or series of refunding issues), proceeds of a prior issue purportedly used to reimburse original expenditures are treated as unspent proceeds of the prior issue unless the purported reimbursement was a valid expenditure under applicable law on reimbursement expenditures on the issue date of the prior issue.