In this link https://turbotax.intuit.com/tax-tips/small-business-taxes/the-home-office-deduction/L1RZyYxzv and https://www.irs.gov/publications/p587#en_US_2021_publink1000295, they both indicates how to calculate business percentage of home office:
You can use any reasonable method to determine the business percentage. The following are two commonly used methods for figuring the percentage.
Divide the area (length multiplied by the width) used for business by the total area of your home.
If the rooms in your home are all about the same size, you can divide the number of rooms used for business by the total number of rooms in your home.
But in Turbotax Home business 2021, I only see the first choice by area. How can I find the second choice?
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TurboTax only uses the most common method by calculating the square footage of the office compared to the square footage of the whole home.
TurboTax only uses the most common method by calculating the square footage of the office compared to the square footage of the whole home.
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