@jeeppadre89 very simple: do you have an appraisal based on the date of death? without that, everyone is just guessing.
When did the death occur?
Suggetion - go out an find an appraiser who can tell you what this land was worth as of the date of death. Without that, the capital gains consequences is unknown.
the tax value has nothing to do with this. It's the market value that matters.
