Distributions to a non-spouse beneficiary, reported on a code 4 Form 1099-R, are not to be included. From the instructions for Form 8880 line 4:
Line 4
Enter the total amount of distributions you, and your spouse if filing jointly, received after 2016 and before the due date of your 2019 return (including extensions) from any of the following types of plans.
• Traditional or Roth IRAs (including myRAs), or ABLE accounts.
• 401(k), 403(b), governmental 457(b), 501(c)(18)(D), SEP, or SIMPLE plans.
• Qualified retirement plans, as defined in section 4974(c) (including the federal Thrift Savings Plan).
Don’t include any of the following.
• Distributions not taxable as the result of a rollover or a trustee-to-trustee transfer.
• Distributions that are taxable as the result of an in-plan rollover to your designated Roth account.
• Distributions from your eligible retirement plan (other than a Roth IRA) rolled over or converted to your Roth IRA.
• Loans from a qualified employer plan treated as a distribution.
• Distributions of excess contributions or deferrals (and income allocable to such contributions or deferrals).
• Distributions of contributions made to an IRA during a tax year and returned (with any income allocable to such contributions) on or before the due date (including extensions) for that tax year.
• Distributions of dividends paid on stock held by an employee stock ownership plan under section 404(k).
• Distributions from a military retirement plan (other than the federal Thrift Savings Plan).
• Distributions from an inherited IRA by a nonspousal beneficiary.
