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user17754281485 · ‎April 5, 2026

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PatriciaV · ‎April 12, 2026

The adjustment of Mortgage Interest for the portion allocated to the Home Office appears on the Tax and Interest Worksheet (Tax & Int Wks) under Line 5. The amount shown on line 5(c) is calculated from Form 8829 Line 14.

To reproduce the adjustment amount, do the following calculation:

Form 8829 Line 10 / Line 12 = %age of mortgage interest.
Multiply that percentage by the amount on Line 14.
This is the adjustment for Home Office mortgage interest, which appears on the Tax & Int Wks Line 5(c).

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