New client, his previous accountant is MIA. He closed and needs to file his final return; closed all bank  accounts June 2019 and notified the state. I filed his 940, OH and Fed W-3, W-2 for him to meet the filing deadlines and he was the only employee.  Now asking me to file his final 1120S. I have numbers but no experience doing this type of return.  I figured the sales and salary but not the payroll and IRA. How do I report his payroll taxes and ira contributions?   Any other considerations are also appreciated.