If your income is below the phase out income level of $197,300 for single filers or $394,600 for married filing joint, it won't matter which entity the income is reported on. That is because there is...
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If your income is below the phase out income level of $197,300 for single filers or $394,600 for married filing joint, it won't matter which entity the income is reported on. That is because there is no limitation on the QBI deduction based on income even if you are a Specified Service Trade or Business (SSTB), if you are below the income threshold. Otherwise, you may face a limit on your deduction based on your income.
It is likely the IRS would see through your attempts to manipulate your deduction by transferring deductions from one entity to another. As a rule, they will deny tax benefits when there is no sound business purpose for structuring things as you suggest, where the main purpose may be to evade taxes. Even if you paid the wages out of our sole-proprietorship to then prop up the income of the S corporation, the IRS would likely consider it's income SSTB like that your sole-proprietorship, since you own both entities and you are involved in an SSTB.