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The exact amount will depend on other factors such as her other income, deductions, filing status, etc. However, the basic calculation is sales price minus commissions and other costs, if any, minus basis equals gain and the gain on art (which is considered a collectible) is taxed at a rate of 28% or less.
Assuming that she had no selling costs, her gain would be $455,000 and the maximum tax would be $127,400.