The whole amount counting on the actual rate.
If I traded 31,500 Little Caesar's pizzas for a house of $200,000 and sold it many years later at $400,000? I would have to pay taxes on the house for the $400,000.
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That is not true with United States federal income tax.
You would calculate the fair market value of 31,500 Little Caesar's pizza's and use that as a cost basis. You would subtract that value from the $400,000 and pay the capital gains income tax on the difference.
Depending on how you acquired the 31,500 Little Caesar's pizza's you may or may not have to pay an income tax on the fair market value of 31,500 Little Caesar's pizza's in the year that you acquire the house.