Updated October 18, 2026. Quick answer: Part III of Form 8582 gives the total passive loss you can use for 2025. Line 10 adds the income on lines 1a and 2a, and line 11 adds line 9 and line 10. The instructions then send you to Parts IV through IX to see which forms get the allowed loss.
What Part III does
The instructions give the purpose: “Use Part III to figure the amount of the losses from all passive activities (as determined in Part I) allowed for 2025.”
You reach it in one of two ways. From line 3, the form says “Line 2d is a loss (and line 1d is zero or more), skip Part II and go to line 10.” And for one filing status, “If your filing status is married filing separately and you lived with your spouse at any time during the year, do not complete Part II. Instead, go to line 10.”
Where the number comes from
Line 10 is straight from Part I: “Add the income, if any, on lines 1a and 2a and enter the total”. The instructions have no separate paragraph for line 10, so the form’s caption is the guide. Lines 1a and 2a are the net income totals from Parts IV and V, covered on the Parts IV and V page.
Line 11 adds the special allowance from Part II to line 10: “Total losses allowed from all passive activities for 2025. Add lines 9 and 10.” If you skipped Part II, line 9 has nothing to carry, so line 11 is built from line 10 alone. Line 9 is explained on the lines 4 to 9 page.
A computed example of the two additions
This is a computed illustration, not an IRS example. Suppose line 1a is $2,000 and line 2a is $1,500. Line 10 is computed as $2,000 + $1,500 = $3,500. If line 9 is $15,000, line 11 is computed as $15,000 + $3,500 = $18,500.
Where it goes next
The form tells you where to look: “See instructions to find out how to report the losses on your tax return”. The line 11 instruction reads “Use Parts IV through IX of Form 8582 and the related instructions to figure the unallowed loss to be carried forward and the allowed loss to report on your forms and schedules for 2025.”
The instructions then split by result. For overall gains: “If you have activities that show overall gain in column (d) of Part(s) IV and/or V, report all the income and losses listed in columns (a), (b), and (c) for those activities on the proper forms and schedules, including Form 8582.”
For overall losses: “If you have activities that show an overall loss in column (e) of Part(s) IV and/or V, you must allocate your allowed loss on Part III, line 11, of Form 8582 to those activities by completing Parts VI, VII, plus VIII and/or IX.” Parts VI to IX are covered on the Form 8582 page. Rental results usually reach the return through Schedule E.
Edition and line numbers
This page reads the 2025 Form 8582, Passive Activity Loss Limitations and its 2025 instructions, the current files irs.gov served on 2026-10-18. They are the files for the tax year 2025 return, filed in 2026. The form’s own header says “Attach to Form 1040, 1040-SR, or 1041.” Check the tax year printed on the form you are filling in and use the line numbers on that year’s form, because a different year’s form can number or word its lines differently. The whole form is walked through on the Form 8582 page.
Common mistakes
- Treating line 11 as the final answer for your return. The instructions say “you must allocate your allowed loss on Part III, line 11, of Form 8582 to those activities by completing Parts VI, VII, plus VIII and/or IX.”
- Filling in Part VI by habit. The instructions say “Complete Part VI only if you entered an amount (other than zero) on Part II, line 9, of Form 8582.”
- Skipping line 10 after bypassing Part II. The form says “Line 2d is a loss (and line 1d is zero or more), skip Part II and go to line 10.”
Related: Schedule E, rental income in retirement, Form 8582, and Schedule 1 lines 3 to 6.
Sources
- Instructions for Form 8582, Passive Activity Loss Limitations (2025): https://www.irs.gov/pub/irs-pdf/i8582.pdf
- Form 8582, Passive Activity Loss Limitations (2025): https://www.irs.gov/pub/irs-pdf/f8582.pdf
Read from the IRS documents linked above on October 18, 2026. General information, not tax advice. Your own facts decide the outcome, and a preparer, the account provider or the IRS is the right place to confirm anything consequential.