We have an S-Corp (2 employees - both owners) - we are making a profit sharing contribution for 2003...when is it due?

Must the contribution be submitted by 3/15 when the S-Corp tax return is due?

Or can the contribution be submitted by 4/15 when the participants (two owners) individual tax return is due?

Thanks!

3/15, unless the corporate return is put on extension, in which case it is 9/15.

Thanks!