Hi there, KateM7.

Welcome back to the QuickBooks Community. We aim to deliver customer satisfaction at all times. And, this isn't the kind of customer service I desire you to experience. With this, may I ask if you encountered a specific error message? What happened when creating a paycheck? I appreciate any further details so I can present accurate details about calculating Simple IRA in QuickBooks Online.

Please know that you're always welcome to comment below and add additional information or if you have other concerns or follow-up inquiries about managing your contributions in QBO. I'm just around to help. Take care always.