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If the property is in Mexico then Mexico has a right to tax on the sale. This is true even if the seller is not a resident of Mexico.
If you are a US citizen or resident alien, you are taxed on worldwide income but the US allows for a tax credit (form 1116) on the amount that is taxable in the US and another country.
To simplify, they both can tax but the US will allow you a credit for the tax you pay Mexico.
Let me see if I can get some specific info about Mexico and potential timeshare problems
Are you dealing with the same company you purchased from?
Any tax in Mexico would be withheld. Do not send any money.