It is not necessarily an error since the percent of business use for the home office is only 20%.
Here is how the calculation works:
If the number entered for business use of the home office is less than 100%, then the calculation could take your profit to a negative number when using the simplified home office calculation. If this happens, then the deduction is disallowed.
Here are the details about how the Simplified Home Office deduction works, and what could be causing the situation in your return.
For any home office deduction (actual expenses or simplified), the home office deduction is not allowed to take a Schedule C bottom line from a positive profit to a loss. Therefore, before the home office deduction is calculated, the tentative profit or loss of the business is considered. If the number is a loss, then no simplified home office deduction is allowed. However, even with a loss, an actual expense home office deduction can be calculated and carried over to the next year. Carryover is only possible when using the actual expenses, not the simplified method.
The profit/loss number that is used to decide whether the home office expense is allowed comes from Schedule C line 7 minus Schedule C line 28. If the result is positive, then that is the first step to get the simplified home office deduction.
If the Business Conducted in the Home Office percentage is any number less than 100%, then the amount on Schedule C line 7 is adjusted by that percentage before the expenses are subtracted. So even with what you expect to be a positive profit situation, the percentage of business conducted in the home office can drop the income to a level where the profit is negative instead of positive. This means that the simplified home office method is not allowed. Again, using the actual expense method can work, but the home office expense is carried over to a future year.
@RichLeja1
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