There is an error in the office in home form. It pulls he wrong number from schedule C

Forum|Forum|4 months ago
January 26, 2026
2 replies
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I found my issue. I had entered the % of home used for business into the % of time used for business field. This reduced my deduction.

TurboTax Online

LeticiaF1

Level 12

The number that gets pulled into the calculation of the office-in-home Form 8829 line 8 is the tentative profit or loss from line 29 of Schedule C. Sometimes this number needs to be adjusted by:

Adding any capital gains from the business use of your home (from Form 8949 or 4797)
Subtracting any business losses that are related to your business but not related to the physical use of your home

Due to these adjustments, the number that carries in to Form 8829 isn't always the same number as line 29 of Schedule C. For more information, refer to Instructions for Form 8829 (2025).

If you are referring to a different calculation, let us know and we can help with any other questions.

Can I take the home office deduction?

Where do I enter the home office deduction for my business?

dragonswng2

Level 2

The 2025 software is pulling line 28 from Schedule C and putting it where line 29 is supposed to go. To be more detailed your software is malfuctioning. It is taking the total expenses and putting it on form 8829 where Tentative profit should go. Thus causing the math to be wrong. Your software is also not allowing me to put in Indirect expenses. This is a Major problem.

AnnetteB6

Level 15

If you are willing to provide a diagnostic copy of your tax data file, I can take a closer look to see what is going on with your home office expense to determine if there is something that needs to be corrected and reported to the development team. The diagnostic file is a copy of your tax return that has all of your personal information removed. You can send one to us by following the directions below:

In addition to providing the token number in a follow-up thread, please also include which version of TurboTax you are using.

TurboTax Online:

Sign into your online account.
Locate the Tax Tools on the left-hand side of the screen.
A drop-down will appear. Select Tools
On the pop-up screen, click on “Share my file with agent.”
This will generate a message that a diagnostic file gets sanitized and transmitted to us.
Please provide the Token Number that was generated in the response.

TurboTax Desktop/Download Versions:

Open your return.
Click the Online tab in the black bar across the top of TurboTax and select “Send Tax File to Agent” *
This will generate a message that a diagnostic copy will be created. Click on OK and the tax file will be sanitized and transmitted to us.
Please provide the Token Number (including the dash) that was generated in the response.

*(If using a MAC, go to the menu at the top of the screen, select Help, then, “Send Tax File to Agent”)

@dragonswng2

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angierysanek

Level 2

I am having the exact same issue. The instructions on Form 8829 Line 8 clearly say to pull the number Schedule C Line 29 and then make adjustments. Instead TurboTax is inserting Schedule C Line 28 as a negative number. This causes the calculation for Line 15 to be wrong. Since I rent an apartment and do not have any adjustments on lines 9-13, this error results in Line 15 being calculated as zero and completely disallows business use of home. This is not correct. Form 8829 Line 8 should show my profit from Line 29.