26 C.F.R. § 12.4
Example (1). Taxpayer A filed an election under § 1.167(a)-11 before February 1, 1972. A elected to use the modified half-year convention by treating all assets as placed in service on the first day of the second quarter of the taxable year, excluded section 1250 property (as defined in section 1250(c)) and property used predominantly outside the United States from the election, and included "subsidiary assets" (as defined in § 1.167(a)-11(b)(5)(vii) of the proposed amendments to the regulations) in the election. A's election does not conform with the regulations under § 1.167(a)-11 as proposed to be amended. A should file an amended return and election within 120 days after the publication of the final Class Life Asset Depreciation Range System (ADR) regulations under § 1.167(a)-11 . Such amended return and election must conform to the final amendments to the regulations. In the amended election, A must adopt one of the conventions permitted by the final amendments. Assuming the proposed amendments are finally adopted, A may exclude his subsidiary assets from the election provided the conditions of paragraph (b)(5)(vii) of § 1.167(a)-11 of the regulations, as proposed to be amended, are met, and A must include property used predominantly outside the United States in the election unless paragraph (b)(5)(iii), (v), or (vi) of § 1.167(a)-11 , as proposed to be amended, permit the exclusion of the property. Generally, A must include section 1250 property in the election unless paragraph (b)(5)(vi) of § 1.167(a)-11 , as proposed to be amended, permits the exclusion of the property.
Example (2). Taxpayer B filed an election to compute depreciation under § 1.167(a)-11 before February 1, 1972. B elected to use the half-year convention and has no assets used predominantly outside the United States. B excluded section 1250 property from the election and included his subsidiary assets in the election. Assume that the provisions of paragraph (b)(5)(vi) of § 1.167(a)-11 , as proposed to be amended, apply and permit the exclusion of section 1250 property and that B does not elect to exclude subsidiary assets pursuant to paragraph (b)(5)(vii), as proposed to be amended. B has no assets which were excluded from the election under paragraph (b)(5)(v) of § 1.167(a)-11 , as proposed to be amended. The election which was filed before February 1, 1972, will be treated as a valid election under the Class Life Asset Depreciation Range System (ADR) as contained in the final amendments to the regulations, if it conforms with those amendments. B need not file an amended election provided his election conforms to the final regulations under § 1.167(a)-11 . However, B may file an amended election within 120 days after the final regulations under § 1.167(a)-11 are published in the FEDERAL REGISTER in order to include section 1250 property, or to exclude subsidiary assets, or to make other changes, or to revoke the election.
26 C.F.R. §12.4