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What will be the capital gains tax after we sell a rental home?
This will be a complex issue and you will need to sit down with a professional to work through the issues: When the house was put up for rent the initial year tax forms should have required that the value of the house/property be calculated. This number was then used for depreciation of the house. This was made more complex based on any capital improvements. If the house wasn't the first he owned, then capital gains might have been rolled over from previous houses which adds a layer of complexity.  Any capital improvements while the house was a rental will also have to be resolved because those were also depreciated since they were placed in service. The deprecation will be recaptured and will be a part of the calculation. You have nowhere near enough info to make a calculation at this time.