What Homeowners in Illinois and Missouri Should Know
Selling a home can be one of the biggest financial transactions of your life. Before you celebrate the profit, it helps to understand what capital gains taxes are, how they work, and whether they apply to you.
This guide walks through the basics in a way that works whether you are brand new to the topic or just want clarity before listing your home.
Quick note: This article is for education only, not tax advice. A CPA or tax pro can help you apply these rules to your exact situation.
What Are Capital Gains?
A capital gain is the profit you make when you sell something for more than you paid for it. In real estate, that profit comes from the difference between what you sell the property for and what you invested in it over time.
Your gain is generally calculated as:
Sale price – selling costs – your adjusted basis = gain (or loss)
Your adjusted basis starts with your original purchase price and increases with qualifying improvements, such as a new roof, a room addition, or a major kitchen renovation. Routine maintenance and basic repairs do not increase your basis.
If the final number is positive, that is your capital gain. If it is negative, you have a capital loss.
Many homeowners selling a primary residence owe little to no federal capital gains tax because of a powerful exclusion. The rules differ when selling an investment or rental property. State taxes in Illinois and Missouri can also affect your final numbers. We’ll touch on that later.
How Federal Capital Gains Taxes Work
Capital gains are taxed differently than regular income, and the biggest factor is how long you owned the property.
If you owned the property for one year or less, the gain is considered short-term and is taxed as ordinary income at your normal tax rate.
If you owned the property for more than one year, it is considered a long-term capital gain. Long-term gains are taxed at special federal rates of 0%, 15%, or 20%, depending on your taxable income.
For 2026, long-term capital gains fall into three brackets:
- 0% rate for lower taxable income ranges
- 15% rate for most middle-income households
- 20% rate for higher-income households
Higher earners may also owe an additional 3.8% Net Investment Income Tax.
However, many homeowners never pay these rates when selling their primary home because of the home sale exclusion.
Selling Your Primary Residence
If the home you are selling is your primary residence, the IRS allows you to exclude:
- Up to $250,000 of gain if you are single
- Up to $500,000 of gain if you are married filing jointly
This exclusion removes that portion of profit from federal taxation entirely. It is not a deduction or a credit. The excluded amount is simply not taxed.
For many homeowners, this means no federal capital gains tax at all.
Who Qualifies for the Home Sale Exclusion?
To qualify, you must meet the ownership and use tests.
- Ownership test: You owned the home for at least two years during the five years before the sale.
- Use test: You lived in the home as your primary residence for at least two of the five years before the sale.
- Timing rule: You generally cannot have claimed this exclusion for another home sale within the last two years.
The two years do not have to be consecutive.
There are also situations where partial exclusions may apply. These can include job relocations, health-related moves, certain unforeseen circumstances, divorce, and military service.
Example: Primary Residence Sale
Imagine you sell your home for $450,000. After subtracting selling costs and your adjusted basis, your gain is $180,000. If you are married filing jointly and meet the requirements, that entire gain may fall under the $500,000 exclusion.
In that case, you could owe zero federal capital gains tax.
Selling an Investment Property or Rental
If the property is a rental, vacation home, flip, or second home, the primary residence exclusion usually does not apply.
That means your gain may be subject to:
- Federal long-term capital gains tax
- Possible 3.8 percent Net Investment Income Tax
- State income tax
If you claimed depreciation while renting the property, part of your gain may also be taxed under depreciation recapture rules. This often surprises property owners and can increase the total tax bill.
Because of these additional factors, selling an investment property often requires more tax planning than selling a primary residence.
Some sellers of investment property consider a 1031 exchange, which can defer capital gains by reinvesting the proceeds into another qualifying investment property.
This is a powerful tool, but it’s rules-heavy and time-sensitive, so it’s one to discuss with a qualified tax pro early in the process.
Federal vs. State Capital Gains Taxes
Federal capital gains taxes follow the 0%, 15%, and 20% structure for long-term gains.
States create their own rules. Some tax capital gains as ordinary income. Some offer deductions. A few states do not tax income at all.
If you live in Illinois or Missouri, here is what you need to know.
Capital Gains Tax in Illinois
Illinois does not have a special capital gains rate.
Instead:
- Capital gains are included as part of your taxable income.
- Illinois applies a flat 4.95% state income tax rate.
If your gain is taxable at the federal level, it generally flows into Illinois taxable income as well. Illinois does not provide a separate reduced capital gains rate.
For Illinois homeowners, this means state tax may still apply even if your federal tax is reduced.
Capital Gains Tax in Missouri
Missouri recently made an important change.
Beginning January 1, 2025, Missouri allows individuals to deduct 100% of capital gains reported for federal income tax purposes when calculating Missouri adjusted gross income.
In practical terms:
- Federal capital gains tax rules still apply.
- Missouri residents may not owe Missouri state income tax on capital gains.
- This applies to individuals rather than all business entities.
For Missouri homeowners and real estate investors, this change can significantly reduce the overall state tax impact of selling a property.
How to Reduce Capital Gains Tax Exposure
Planning ahead makes a difference.
- Keep documentation of major home improvements.
- Make sure you understand whether your home qualifies as a primary residence.
- If possible, hold property longer than one year to qualify for long-term rates.
- If selling an investment property, ask about options such as a 1031 exchange.
- Speak with a tax professional before listing if you expect a large gain.
Final Thoughts
Capital gains taxes do not affect every home seller, but when they do, they can significantly impact your bottom line.
For many primary homeowners, the $250,000 or $500,000 exclusion eliminates federal capital gains taxes entirely. For investment property owners, the rules are more complex, and state laws can make a noticeable difference.
Understanding these rules before selling allows you to plan effectively, estimate your true net proceeds, and move forward with confidence.
