Ch6. Capital Gains Tax — Complete Guide to Selling Real Estate and Stocks

What Is Capital Gains Tax?

Capital gains tax is the federal tax on profit from selling a capital asset. Put simply: “buy low, sell high — pay tax on the difference.”

Capital Gain = Amount Realized − Adjusted Basis − Selling Costs

Capital Gains Tax = Capital Gain × Tax Rate
                    (after applicable exclusions and deductions)

Capital gains tax is governed by the Internal Revenue Code (primarily §§1001, 1221–1231) and is a federal direct tax. State income taxes also generally apply to capital gains.

Taxable Assets

The main asset categories subject to capital gains tax:

Real Property and Real Property Rights

Land, buildings (including residential homes)
Rights to acquire real property (contracts, options)
Easements and other real property interests

Stocks and Business Interests

Publicly traded stock (all sales — short and long term)
Private company stock and LLC membership interests
Partnership interests

Other Capital Assets

Patents, copyrights, and other intangible assets
Collectibles (antiques, art, coins, gems) — taxed at max 28%
Precious metals (also max 28%)

Capital Gains Tax Calculation for Real Estate

Step 1: Calculate the Gain

Capital Gain = Amount Realized − Adjusted Basis − Selling Expenses

Adjusted Basis = Original purchase price
               + Acquisition costs (title insurance, attorney fees, transfer taxes)
               + Capital improvements (renovation, addition, new roof)
               − Depreciation deductions taken (if rental property)

Selling Expenses: real estate commission (typically 5%–6%), attorney fees,
                  transfer taxes paid by seller, advertising costs

Step 2: Apply the §121 Primary Residence Exclusion

Long-term homeowners receive the most powerful tax break in the tax code.

Filing Status	Maximum Exclusion
Single	$250,000
Married Filing Jointly	$500,000

Requirements: Owned AND used as primary residence for at least 2 of the 5 years immediately preceding the sale. Cannot be used more than once every 2 years.

Step 3: Determine Capital Gains Rates

Long-Term Capital Gains Tax Rates (2025)

Taxable Income (Single)	Taxable Income (MFJ)	LTCG Rate
$0 –$ 48,350	$0 –$ 96,700	0%
$48,351 –$ 533,400	$96,701 –$ 600,050	15%
Over $533,400	Over $600,050	20%

Plus: 3.8% Net Investment Income Tax (NIIT) if MAGI exceeds $200,000 (single) /$ 250,000 (MFJ)

Short-Term Capital Gains (assets held ≤ 1 year): taxed as ordinary income (10%–37%)

Special Rates:

§1250 unrecaptured depreciation (rental real estate): max 25%
Collectibles gain: max 28%

§121 Primary Residence Exclusion — The Biggest Homeowner Tax Break

The most powerful legal tax reduction for individual taxpayers. When requirements are met, gains up to $500,000 (MFJ) are completely excluded from federal income tax.

Basic Requirements

Ownership: owned the home for at least 2 years (of the past 5)
Use: used as principal residence for at least 2 years (of the past 5)
Frequency: not used the exclusion within the past 2 years

Partial Exclusion

If you fail to meet the full 2-year test due to a job change, health reasons, or unforeseen circumstances, you may qualify for a partial exclusion proportional to the time satisfied.

Temporary Absence and Rental

Example: Own home for 5 years, live in it 3 years, rent it for 2 years
  Before renting: 3-year owner/use → 2-year test met
  Can still use §121 exclusion since 2-of-5-year test is met
  BUT: gain attributable to the rental period (depreciation recapture) is NOT excludable

Temporary Rental Rule:
If rented while trying to sell or temporarily relocated, IRS may treat as continued use
Consult a tax professional for mixed-use situations

The “Temporary 2-Home” Rule (Simultaneous Homeownership)

When buying a new home before selling the old one, both can potentially qualify — but only one residence can be the primary residence at any given time. The key is to sell the old home within 3 years of purchasing the new one.

Stock and Investment Capital Gains

When Does the IRS Tax Stock Sales?

All stock sales generate a capital gain or loss:
Short-term (≤1 year): ordinary income rates (10%–37%)
Long-term (>1 year): preferential 0/15/20% rates

Wash-Sale Rule (§1091):
Cannot sell a stock at a loss and repurchase the same or substantially identical
security within 30 days before or after the sale
If triggered: the loss is disallowed (added to basis of replacement shares)

Loss Harvesting:
Capital losses offset capital gains dollar-for-dollar
Net losses up to $3,000/year can offset ordinary income
Unlimited carryforward of excess losses to future tax years

Current US Stock Tax Treatment

Qualified Dividends:
Taxed at preferential 0/15/20% LTCG rates (not ordinary income)
Requirements: US corporation (or qualifying foreign); held >60 days around ex-dividend date

Ordinary Dividends:
Taxed at ordinary income rates (10%–37%)

Municipal Bond Interest:
Federally tax-exempt (generally also state-exempt if issued in your state of residence)

Treasury Bond Interest:
Federally taxable; exempt from state/local income tax

Foreign Stock / Investments:
Report on FBAR (FinCEN 114) if foreign accounts exceed $10,000 threshold
FATCA Form 8938 if specified foreign assets exceed thresholds ($50,000 single / $100,000 MFJ)

Stepped-Up Basis at Death

Critical estate planning concept:
When a person dies holding appreciated assets, heirs inherit at the fair market value
on the date of death ("stepped-up basis") — ALL pre-death appreciation is permanently
excluded from capital gains tax.

Example:
  Parent purchased stock for $10,000 in 1990
  Stock worth $500,000 at parent's death in 2025
  Child inherits → adjusted basis = $500,000 (stepped up)
  If child immediately sells: $0 capital gain, $0 capital gains tax
  Unrealized gain of $490,000 permanently excluded

This is the primary reason wealthy families often prefer to hold appreciated assets
until death rather than gifting them during lifetime.

Filing and Payment Procedures

For Real Estate Sales

Preliminary reporting: escrow company typically files Form 1099-S with the IRS
Schedule D / Form 8949: report the sale on your annual Form 1040 (due April 15)
Installment sales: if seller finances, report gain as payments are received (Form 6252)

For Stock Sales

Broker provides Form 1099-B with proceeds and cost basis information
Report all sales on Form 8949 → totals carry to Schedule D → Form 1040
Wash-sale adjustments may be needed if broker doesn’t account for all wash sales

Practical Tax Minimization Strategies

Strategy 1: Hold Assets for Long-Term Rates

Holding 1 year and 1 day converts short-term (up to 37%) to long-term (max 20%)
For someone in the 22% ordinary income bracket:
Short-term on $100,000 gain = $22,000 tax
Long-term on $100,000 gain = $15,000 tax (or possibly $0 at 0% rate)
Savings: $7,000+ just by waiting past 1 year

Strategy 2: Use the §121 Exclusion Strategically

Build equity in a primary residence and hold for 2+ years before selling. For married couples, up to $500,000 of gain is completely excluded — one of the few truly large capital gains that can be made completely tax-free.

Strategy 3: Tax-Loss Harvesting

Sell underperforming investments to generate capital losses that offset other capital gains. Do not violate the wash-sale rule.

Strategy 4: Gifting Appreciated Assets to Family

Giving appreciated assets to family members in lower tax brackets who then sell can shift the capital gains tax to a lower rate (potentially 0%). The “kiddie tax” rules under §1(g) limit this strategy for children under age 19 (or 24 if full-time students).

Strategy 5: 1031 Like-Kind Exchange (Investment Real Estate Only)

§1031 Exchange:
Defer all capital gains tax by exchanging one investment property for another
Requirements:
  - Both properties must be held for investment or business use (not personal residence)
  - Must identify replacement property within 45 days of sale
  - Must close on replacement property within 180 days
  - Use a qualified intermediary (QI) — proceeds cannot touch your hands

Strategy: chain together 1031 exchanges indefinitely → step up basis at death → zero capital gains tax ever paid

Common Mistakes and Warnings

Mistake 1: Missing the estimated tax deadline for a large real estate sale

Large capital gains can create an underpayment penalty. If you sold a property in Q1, you may owe Q1 estimated taxes by April 15. Don’t wait until April 15 of the following year.

Mistake 2: Not tracking capital improvements

Every dollar of improvements (renovation, addition, new HVAC) adds to your adjusted basis and reduces taxable gain. Keep all contractor receipts for as long as you own the property plus 3 years after sale.

Mistake 3: Missing the 2-year residency requirement for §121

You must actually live in the home — not just own it. Renting the home during the 2-year window can disqualify the exclusion.

Mistake 4: Forgetting about state capital gains tax

Many states tax capital gains at ordinary income rates. California taxes capital gains up to 13.3%. Federal planning alone is not sufficient for high-value sales.

Summary Table

Category	Key Point
Taxable assets	Real estate, stocks, collectibles, business interests
Primary residence exclusion	$250K /$ 500K — 2-of-5-year ownership + use
Tax reduction key	Long-term holding, §121 exclusion, loss harvesting
Filing deadline	Annual Form 1040 (April 15) + estimated payments if large gain
Annual loss deduction	$3,000 net capital loss against ordinary income

Capital gains tax planning is fundamentally about advance planning. Before selling any high-value asset, always run a tax simulation and verify whether any exclusions or deferral strategies apply.

OIYO Editorial