If someone had an LLC business in 2017, filing schedule c, and closed the LLC and business before year end – could they still set up an SEP-IRA for that business before April 17? In other words – did closing the LLC close that door, or is the schedule C income in 2017 the only requirement? The goal would be to roll the SEP-IRA contribution over to the person’s solo 401k for an ongoing business, and shut down the SEP-IRA. They already maxed out their solo 401k contributions.