It’s common to consider making your S corporation (versus yourself) a partner in your partnership: it saves you self-employment taxes.
Does this affect your Section 199A deduction? It does.
Guaranteed payments are not qualified business income (QBI) for the Section 199A deduction. The non-QBI guaranteed payment rule applies whether the partner receives the payment as an individual or as pass-through income from an S corporation.
Your only options to claw back your Section 199A deduction with the S corporation as a partner are to reduce or eliminate the partnership’s guaranteed payments and then take the income pro rata based on ownership percentage, or to use a special allocation of partnership tax items.
Keep the S corporation self-employment tax savings in mind when considering your partnership activity. Often the self-employment tax savings can make the S-corporation-as-a-partner strategy well worth it.