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§121 + §1031 Hybrid (Live-In Then 1031 Exchange)

Combine §121 tax-free exclusion on the residence portion with §1031 deferral on the rental portion — same property.

Overview

For a home used partly as primary and partly as rental (or converted primary), Revenue Procedure 2005-14 permits combining §121 (exclude up to $250K/$500K on primary-use portion) with §1031 (defer gain on rental-use portion into like-kind property). Requires basis allocation and separate use tracking. Powerful for homes with detached rental units, ADUs, or homes converted from primary to rental. Complex — dedicated CPA required.

Best fit
Mixed-use property ownersHome-with-ADU sellersPrimary-to-rental conversions
Estimated impact
$500K §121 exclusion + unlimited §1031 deferral stacked

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