Question: In what instances, concerning involuntary conversions, must a taxpayer file an amended tax return (Form 1040X)? Multiple Choice When the taxpayer does not buy replacement property within the replacement period. When the replacement property purchased by the taxpayer costs less than the amount realized for the converted property. When the entire amount of the insurance proceeds is used to purchase replacement property. Both when the taxpayer does not buy replacement property within the replacement period and when the replacement property purchased by the taxpayer costs less than the amount realized for the converted property.