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View serviceSection 121 Exclusion Explained
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How the Section 121 primary residence exclusion works, its dollar limits, and how it interacts with a 1031 exchange on a mixed use property.
Section 121 of the Internal Revenue Code allows a homeowner to exclude a portion of gain from the sale of a primary residence from federal income tax. An individual filer can exclude up to 250,000 dollars of gain, and a married couple filing a joint return can exclude up to 500,000 dollars, provided the owner meets both the ownership test and the use test, having owned and used the property as a primary residence for at least two of the five years preceding the sale.
The exclusion can generally be used only once every two years, and it applies per taxpayer rather than per property, so an owner who sells multiple homes over time can potentially use the exclusion again after the two year waiting period, as long as the ownership and use tests are met for the new property. Partial exclusions are available in certain circumstances, including a job relocation, health condition, or other unforeseen circumstance that forces a sale before the two year use requirement is fully satisfied, calculated on a pro rata basis tied to the portion of the two year period actually met.
Section 121 applies only to the personal use portion of a property. When a home has been used partly as a rental, such as a duplex where the owner occupies one unit and rents the other, or a residence converted to a rental for a period of time, the exclusion applies only to the gain allocable to the personal use portion, while the investment use portion is generally not eligible for the exclusion and may instead be eligible for a 1031 exchange under the technical rules in Revenue Procedure 2005-14. Orange County owners with mixed use property history should have a CPA calculate the allocation before relying on either provision.
What Is Included
- Ownership and use test verification for Section 121 eligibility
- Exclusion amount calculation based on filing status
- Partial exclusion eligibility review for qualifying unforeseen circumstances
- Gain allocation between personal use and investment use for mixed use property
- Coordination with CPA on Revenue Procedure 2005-14 combined treatment where applicable
- Documentation support for ownership and use history
- Two year prior use verification before applying the exclusion again
- Referral coordination for a 1031 exchange on any investment use portion
Common Situations
- Orange County homeowner confirming exclusion eligibility before selling a primary residence
- Owner of a duplex or multi-unit property allocating gain between personal and rental use
- Homeowner facing a forced move before the two year use requirement is fully met
Frequently Asked Questions
How much gain can Section 121 exclude?
An individual can exclude up to 250,000 dollars and a married couple filing jointly can exclude up to 500,000 dollars, subject to the ownership and use tests.
How often can the Section 121 exclusion be used?
Generally once every two years per taxpayer, though the property being sold can change as long as the ownership and use tests are met for each sale.
Is a partial exclusion available if the two year use test is not fully met?
Yes, a partial exclusion calculated on a pro rata basis is available for certain qualifying circumstances such as job relocation or a health related move.
Does Section 121 apply to a property with both personal and rental use?
Only the gain allocable to the personal use portion qualifies for the exclusion. The investment use portion is generally not covered by Section 121.
Can Section 121 and a 1031 exchange both apply to the same property?
In limited cases with documented mixed use history, Revenue Procedure 2005-14 allows the exclusion to apply to the personal use gain while a 1031 exchange applies to the investment use gain.
Does Section 121 apply to investment property?
No, Section 121 is limited to a primary residence. Property held solely for investment or business use is not eligible and instead may qualify for a 1031 exchange.
Example of the type of engagement we can handle
Example Capability
Service type:
Section 121 Eligibility Review
Location:
Orange County, CA
Scope:
Confirm exclusion eligibility and calculate gain allocation for a Tustin owner occupied duplex with one rented unit
Client situation:
Owner of a Tustin duplex living in one unit and renting the other wanted to understand how much gain would qualify for the Section 121 exclusion on a planned sale
Our approach:
Verified ownership and use history against the two of five year test, calculated the gain allocation between the owner occupied unit and the rented unit, coordinated with the owner's CPA on Revenue Procedure 2005-14 treatment for the rental portion
Expected outcome:
Owner confirmed the personal use portion qualified for the exclusion and began evaluating a 1031 exchange for the investment use portion
Contact us to discuss your situation in Orange County, CA. We can share references upon request.
Educational content only. Not tax, legal, or investment advice.
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Identification Letter 7/21/2026 Qualified Intermediary, Please accept this written identification for my pending Section 1031 exchange in Newport Beach, CA. Replacement properties: 1) ____________________ 2) ____________________ 3) ____________________ I confirm these properties meet the like-kind and value requirements as of today. Signature ____________________
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