IRS Updates to Form 8829 Instructions
Summary
The IRS has updated the instructions for Form 8829, used by taxpayers to calculate the deductible expenses for business use of a home. The updates clarify references on Line 11 and Line 17 of the form, specifically regarding student loan interest deductions and the use of the Line 11 Worksheet.
What changed
The IRS issued post-release updates to the instructions for Form 8829, effective March 5, 2026. These changes are minor clarifications to existing guidance. Specifically, Step 3 of the Iteration instructions for the Line 11 Worksheet was updated to include 'student loan interest deduction (Schedule 1, line 21)' in the list of tax products. Additionally, for taxpayers itemizing deductions on Schedule A, the reference on Line 17 was corrected from 'line 10' to 'line 11' of the Line 11 Worksheet.
These updates are primarily informational and do not introduce new compliance obligations or penalties. Taxpayers who have already filed using the prior instructions should review these changes to ensure accurate reporting if they are still within a period where amendments are feasible. The primary impact is on the clarity of the instructions for calculating home office expenses and their interaction with other deductions.
What to do next
- Review updated instructions for Form 8829 for accuracy in calculating home office expenses.
- Ensure any amended filings reflect the clarified references on Line 11 and Line 17.
Source document (simplified)
Updates to the Instructions for Form 8829
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If you downloaded or printed the 2026 Instructions for Form 8829 prior to March 5, 2026, please note the following two updates.
Line 11
Step 3 of the Iteration instructions for the Line 11 Worksheet was updated to include "student loan interest deduction (Schedule 1, line 21)” in the list of tax products in the second sentence.
Line 17
Taxpayers itemizing deductions on Schedule A was updated to replace the incorrect reference to “line 10” of the Line 11 Worksheet with “line 11.” The text now reads: “If you used the Line 11 Worksheet to figure the amount to include in column (a) of line 11, then include the amount from line 11 of the Line 11 Worksheet in column (a) of line 17; otherwise, do not enter an amount on line 17.”
Page Last Reviewed or Updated: 20-Mar-2026
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