I am sorry you lost money on the transaction. You need to go back into 2017 and report the additional expenses as an addition to basis (cost) of the property you sold. That way, your capital gain reported in 2017 will become a loss and you will probably receive a refund of taxes since your income will be reduced.
Unfortunately, the loss is a capital loss, which are limited to $3,000 per year. If you cannot take the full loss in 2017, you can carry it forward to 2018 and to years after that.
You can amend your return in TurboTax by following these instructions:
1. Log into your TurboTax program
2. Find "Your Tax Return & Documents" on your home page
3. Click on the "Show" option
4. Select the year you want to amend
5. You will see an option to "Amend(change)" the return for that year.
6. Just follow the instructions to start the amend process.
If you have a loss carryover to 2018, you will have to amend that return also. You will see an option to enter your previous year carryover loss under "Investment Income" in the "Wages and Income" section and then "Capital Loss Carryover".
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