Proving “Use” Requirement for Full Exclusion of Gain

[Michael Medaglia]

My wife and I are approaching 2 years of ownership and use of our only home as our primary residence in which case we should qualify for full $500 exclusion of capital gains upon sale. The problem is she is not on the title and she is unable to get proof of change of address from USPS when we moved in 2 years ago. Will the IRS require her to furish proof of residence? What proof could she provide?