My business is a Schedule C sole proprietorship. I'm sure I can find documentation in my files telling myself I was electing to make a deferral contribution as part of my 2016 income tax filing. However, no plan was formally established in calendar 2016.
All else seems to track. Form 4868 mailed 04/11/17. Form 1040 filed electronically 08/23/17. However, no contribution was made so the deduction was not taken. Now the contribution can be made. So I'm trying to assure creating a plan, making a contribution and filing a Form 1040X is a legitimate, allowable procedure to qualify for taking the deduction (assuming an election is in my firm's files).
