Final answer:
Corey would report $10,000 if they split the income evenly, or the appropriate portion of the $20,000 based on their arrangement and his wife would report the full $15,000 from her separately owned property on their individual tax returns if they file separately.
Step-by-step explanation:
If Corey and his wife are living in Las Vegas Nevada and they file separate tax returns the rental income should be reported separately based on ownership. Corey would report the $20,000 a year in net rental income from the apartment house they own together. Since this is a jointly owned property and they choose to file separately, generally each spouse would report half of the income and expenses on their separate returns, unless a different division is agreed upon and can be substantiated. His wife would report the $15,000 a year in net rental income from the apartment she had purchased before their marriage, as it is her separate property.