Timing of Employer Partnership Contributions

[Guest Janiele]

In a standard 401k/Profit Sharing Plan, do the partner's employer contributions have to be made by 4/15, if the Form 1065 (Partnership Return) is not extended. If the partner's put their 1040's on extension, can they fund their by the 1040 extended due date, or is it by the due date of the partnership return (4/15 if not extended). Since the employees' profit sharing contribution goes onto the the 1065, that would need to be deposited by the 1065 due date, correct?