You enter all of your business income and expenses in TurboTax. When you are done entering your tax information and numbers, you will be asked to enter a number that will adjust your income to community income. Since you are splitting your business income with your spouse, you need to allocate half of the QBI deduction with your spouse as well.
You are correct, you should not spilt your self-employment tax with your spouse, since you are getting full credit for that with your retirement account maintained with the Social Security Administration.
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