1. Calculation of the gross capital gain
Gross capital gain = sale price (reduced by the costs and taxes borne by the seller) − acquisition price (increased by costs and works). The acquisition price may be increased on a flat-rate basis (works: 15% of the acquisition price after 5 years of holding, or the actual amount on supporting documents) or by acquisition costs (7.5% flat rate or actual). These increases reduce the taxable base.