How To Write A Rollover Check . Just remember that once you add money to your rollover ira, you may not be able to roll the account. The numerical amount of the check goes in the box on the right. Reality check See what happens when we abrogate... from johnschneiderblog.com Say your 401 (k) balance is $50,000. Line 15b of form 1040 asks for the “taxable amount.” Yes, you can make contributions to your ira, subject to the irs annual contribution limits ($6,000 for the 2021 tax year and $6,000 for the 2022 tax year.