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You will likely report the sale of each property separately.
All sale transactions are reported on form 4797
Rough estimate will be
200K (selling price) MINUS $175 (adjusted basis 475k - 300k) = so I see a loss of $25,000
That loss is fully deductible against other taxable income reported and will be reported on form 1040 line 14 as negative amount.
However - because you sold on installments - and the sale contract does not have state interest rate - there must be so-called imputed interest. If the installment sales contract does not provide for adequate stated interest, part of the stated principal may be recharacterized as imputed interest or as interest under the original issue discount rules, even if you have a loss.
You must use the applicable federal rate (AFR) to figure the unstated interest on the sale.IRS publishes these rates here
So if you add interest - your loss will be more than that - and you will claim interest income in coming years.
Let me know if you need any help with reporting.