What rate of French tax will be applied to my rental income?

Under the Regime Simplifié any profits after allowable expenditure are taxed at a rate of 37.20%(20% income tax rate and 17.20% social charges tax rate).

Under the Regime Micro-Entreprise 50% of turnover is deemed to be profit, with this being taxed at a rate of 37.20% - example 10.000 Euros turnover @ 50% = 5.000 Euros @ 37.20% = 1.860 Euros tax.