Changes in Methodology
Rule 05g .0501 - Alternative ApportionmentRule 05g .0502 - Original ReturnsRule 05g .0503 - Secretary's Authority to Adjust a Taxpayer's ReturnRule 05g .0504 - Taxpayer Authority to Change a Method of Assignment on a Prospective BasisRule 05g .0505 - Secretary Authority to Change a Method of Assignment on a Prospective Basis