In the title compound, C12H16FNO3, the dioxane ring adopts a chair conformation with the methyl groups and amine N atom in equatorial positions. The best plane through the dioxane ring makes a dihedral angle of 43.16 (8)° with the phenyl ring. In the crystal, pairs of C - H⋯O hydrogen bonds link the molecules into centrosymmetric R 2 2(8) dimers, which are linked into [100] chains by further C - H⋯O hydrogen bonds. The N - H group does not participate in hydrogen bonding.