We derive superconducting mean-field equations for an attractive interactio
n V in the s-wave channel when local Coulomb interactions are taken into ac
count for any value of U. Results show that Coulomb repulsion diminishes th
e critical temperature T-c to the order parameter Delta (T) for values of U
greater than or equal to \V\. Furthermore, the results are also quite sens
ible to band filling. In the presence of local correlations, 2 Delta (O)/T-
c differs from the BCS ratio since Coulomb interactions affect much more su
perconducting critical temperature T-c than superconducting order parameter
Delta (T). Some consequences of our findings for experimental measurements
in narrow band systems are discussed.