If your sister paid $205k then your cost basis would be $205k. If you want to verify or are trying to find documentation you can go to your county courthouse recorder of deeds. They have the records of all sales on the house. Since this was a home you lived in you would enter the sale by clicking on the following:
- Federal
- Income
- Show more next to Less Common Income
- Start next to sale of your main home
- Then walk through and enter the amount your portion of the sale and expenses
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