9.4 Principal Residence Taxation & the Section 121 Exclusion

9.4 Principal Residence Taxation & the Section 121 Exclusion

Core Principle: Content Area VII, Federal Income Tax Laws (5%), opens with two sub-topics before it reaches investment property: Principal Residence and Sale of Principal Residence. Nearly every residential seller a Florida broker meets asks the same question at the listing appointment — will I owe tax on this? The broker's job is to explain the framework accurately and then send the seller to a tax professional for the answer.

[!IMPORTANT] This is background, not advice. A Florida licensee who computes a client's tax liability or advises on tax positions is practising outside the licence. Explain the structure; refer the calculation.

---

1. Owning a Principal Residence

Florida adds no state income tax layer, so the federal treatment is the whole picture for income tax purposes. Florida's own homeowner tax benefits — the homestead exemption and the Save Our Homes assessment limitation — operate on ad valorem property tax, not on income tax, and the two should never be conflated.

---

2. Computing Gain

   SELLING PRICE
   -  Selling expenses (commission, doc stamps on the deed, title,
                        closing costs paid by the seller)
   = AMOUNT REALIZED

     ORIGINAL COST BASIS (purchase price + acquisition costs)
   +  CAPITAL IMPROVEMENTS
   -  DEPRECIATION allowed or allowable (only for business/rental periods)
   = ADJUSTED BASIS

   AMOUNT REALIZED  -  ADJUSTED BASIS  =  GAIN

Improvement Versus Repair

Only capital improvements increase basis. The distinction matters because it directly reduces taxable gain.

Sellers routinely fail to keep improvement records for a home held twenty years, and the lost basis is real money. Reminding a seller early to gather improvement receipts is a genuine service a listing broker can render without straying into tax advice.

Worked Example

A Florida couple bought their home for $305,000, paid $4,000 in acquisition costs, and added $78,000 in documented capital improvements. They sell for $742,000 with $52,000 of selling expenses.

• Amount realized: $742,000 − $52,000 = $690,000
• Adjusted basis: $305,000 + $4,000 + $78,000 = $387,000
• Gain: $690,000 − $387,000 = $303,000

---

3. The Section 121 Exclusion

IRC Section 121 lets a qualifying taxpayer exclude gain on the sale of a principal residence.

Applying it to the couple above: their $303,000 gain is fully covered by the $500,000 joint exclusion, and no gain is recognized. Had they been a single filer, $250,000 would be excluded and $53,000 would be taxable as long-term capital gain.

The Three Tests

  1. OWNERSHIP TEST   Owned the home for at least 24 months (2 years)
                      during the 5-year period ending on the sale date

  2. USE TEST         Used the home as a principal residence for at least
                      24 months during that same 5-year period

  3. FREQUENCY        Did not exclude gain from the sale of another home
                      during the 2-year period before this sale

The ownership and use periods need not be the same 24 months, and the months need not be consecutive — they simply must both fall inside the 5-year window ending on the date of sale. For a married couple filing jointly to claim the full $500,000, either spouse may satisfy the ownership test, but both must satisfy the use test, and neither may have used the exclusion within the previous two years.

Partial Exclusion

A taxpayer who fails the two-year tests may still qualify for a reduced exclusion, prorated by the fraction of the two-year period satisfied, where the sale is by reason of a change in place of employment, health, or certain unforeseen circumstances defined by the Internal Revenue Service.

Example. A single taxpayer who lived in the home 12 of the required 24 months before relocating for a new job may claim up to 12/24 of $250,000 = $125,000 of exclusion.

Military Suspension

A member of the uniformed services, foreign service, or intelligence community on qualified extended duty may elect to suspend the running of the five-year test period for up to 10 years, so that time away on assignment does not defeat the use test.

---

4. Where Section 121 Does Not Reach

[!NOTE] Section 121 and Section 1031 are different tools for different assets. Section 121 excludes gain permanently on a principal residence. Section 1031 defers gain on real property held for productive use in a trade or business or for investment — and since the 2017 Tax Cuts and Jobs Act, 1031 applies to real property only. A personal residence can never be the subject of a 1031 exchange, and investment property can never claim Section 121.

The Old Rules Are Gone

Before 1997, homeowners used a rollover of gain into a replacement residence and a one-time over-55 exclusion. Both were repealed and replaced by Section 121 as it stands today. There is no requirement to buy another home, no age requirement, and — apart from the two-year frequency rule — no limit on how many times the exclusion may be used across a lifetime.