You only use one. Which one you use depends on whether you have a gain or loss and what the adjusted cost basis was at time of transfer.
To figure out the basis of property you receive as a gift, you must know three amounts:
- The adjusted cost basis to the donor just before the donor made the gift to you.
- The fair market value (FMV) at the time the donor made the gift.
- The amount of any gift tax paid on Form 709, United States Gift (and Generation-Skipping Transfer) Tax Return.
If the FMV of the property at the time of the gift is less than the donor's adjusted basis, your adjusted basis depends on whether you have a gain or loss when you dispose of the property.
- Your basis for figuring a gain is the same as the donor's adjusted basis, plus or minus any required adjustments to basis while you held the property.
- Your basis for figuring a loss is the FMV of the property when you received the gift, plus or minus any required adjustments to basis while you held the property.
Note: If you use the donor's adjusted basis for figuring a gain and get a loss, and then use the FMV for figuring a loss and get a gain, you have neither a gain nor loss on the sale or disposition of the property.
If the FMV is equal to or greater than the donor's adjusted basis, your basis is the donor's adjusted basis at the time you received the gift. If you received a gift after 1976, increase your basis by the part of the gift tax paid on it that is due to the net increase in value of the gift. To figure out the net increase in value or for other information on gifts received before 1977, see Publication 551, Basis of Assets. Also, for figuring gain or loss, you must increase or decrease your basis by any required adjustments to basis while you held the property.
The above information was taken from the IRS link below. Please click the link for more information.
https://www.irs.gov/faqs/capital-gains-losses-and-sale-of-home/property-basis-sale-of-home-etc/prope...
