What this line means
The sum of lines 1 through 7 and line 9. This is your total additional income — everything beyond wages, interest, dividends, retirement distributions, and Social Security that must be reported. This number flows directly to Form 1040 line 8, where it joins the income reported on the first page of your 1040 to calculate total income.
Does this apply to you?
- You entered any amount on Schedule 1 Part I (lines 1 through 9)
- You have self-employment income, rental income, unemployment, or any other additional income
- You filed Schedule C, Schedule E, or Schedule F
Easy to overlook
Forgetting to attach Schedule 1 to your return If you have any additional income, Schedule 1 must be filed with your Form 1040. 1 Tax software handles this automatically, but paper filers sometimes calculate the total on Schedule 1 and enter it on Form 1040 line 8 without attaching the schedule. The IRS needs Schedule 1 to verify the components of your additional income. General filing pattern — Schedule 1 omitted from return
A negative total reduces your income on Form 1040 If your business losses, farm losses, or NOL deductions exceed your positive additional income items, line 10 is negative. 2 This negative number on Form 1040 line 8 reduces your total income, which reduces your AGI and can increase eligibility for credits and deductions that phase out at higher income levels. IRS Schedule 1 Instructions — Line 10
Watch out for this
Entering the total from Part I on the wrong line of Form 1040. Line 10 of Schedule 1 goes to line 8 of Form 1040, not line 10. Form 1040 line 10 is for adjustments to income (from Schedule 1 Part II). Swapping these two numbers puts additional income where adjustments belong and vice versa, causing your AGI to be wrong.
Footnotes
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IRS Schedule 1 (Form 1040) Instructions, General Information. https://www.irs.gov/pub/irs-pdf/i1040s1.pdf ↩
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IRS Schedule 1 (Form 1040) Instructions, Line 10. https://www.irs.gov/pub/irs-pdf/i1040s1.pdf ↩