Amount of withholding
Regulations: Article 31.2 Law IRNR
The withholding must be an amount equivalent to the tax debt arising from the provisions of the Tax itself or those established in an Agreement.
However, the withholding agent shall not take into account the following expenses or deductions (which are applicable when calculating the tax): deductible expenses, the special tax rate on real estate of non-resident entities and the deduction for donations.