If you sold appreciated stock, a rental property, or your business last year in Missouri, you may be about to keep every dollar of state tax you expected to pay on the gain. In mid-2025, Missouri became the first state in the nation to fully exempt individuals from state-level capital gains tax — a change that quietly rewrites the math on when to sell a business, a building, or a stock portfolio if you live there.
Most tax headlines focus on federal law. This one is different: it's a state-only change, it applies retroactively to gains realized in a prior tax year, and it directly benefits the exact structure most small businesses use — the pass-through entity.
What Missouri's House Bill 594 Actually Does
Governor Mike Kehoe signed HB 594 into law on July 10, 2025. The core provision lets individual filers subtract 100% of their federally reported capital gains from their Missouri taxable income. In plain terms: whatever capital gain shows up on your federal return gets backed out entirely before Missouri calculates what you owe.
The exemption covers:
- Short-term and long-term gains — no holding-period requirement to qualify
- Stocks and brokerage account sales
- Real estate, including investment and rental property
- Cryptocurrency
- Gains passed through from an S corporation or partnership to an individual owner's personal return
It does not cover:
- Capital losses (losses still only offset gains at the federal level; Missouri's subtraction is gains-only)
- Trusts and fiduciary returns
- C corporations, at least for now — corporate filers become eligible for the same deduction only once Missouri's top individual income tax rate falls to 4.5% or below. The rate was 4.7% heading into 2025, so most C-corp sellers are still on the hook at the state level until that trigger is hit.
Missouri residents claim the subtraction on Form MO-A, filed alongside the standard MO-1040. Because this is new, doubly check the current-year MO-A instructions with a Missouri-licensed CPA before you file — effective dates and the first eligible filing year have shifted slightly as the Department of Revenue has issued guidance, and you want to be certain which tax year you can first claim it on.
Why This Matters More for Small Business Owners Than It Sounds
Corporate tax cuts usually help corporations. This one is aimed squarely at individuals — which is exactly how most small and mid-sized businesses are actually taxed.
If your business is an LLC, S corporation, sole proprietorship, or partnership, its income and gains flow through to your personal Form 1040 already. That means when Missouri exempts "individual" capital gains, it's exempting the gain a business owner recognizes when:
- They sell the business itself — whether that's an asset sale or a sale of the LLC membership interest, most of that gain lands on the owner's personal return as a capital gain, and Missouri's subtraction can wipe out the state-level tax on it entirely.
- They sell business real estate — a building the business owned and sold, with the gain passing through to the owner.
- They liquidate an investment account funded by years of retained business profits.
For an owner nearing retirement or a planned exit, this changes the calculus on timing. A sale that would have been split between federal capital gains tax and a state-level bite now only faces the federal side in Missouri. That can be a meaningful percentage-point swing on a transaction that might be the single largest financial event of an owner's career.
It's worth being precise about the limits, though. The subtraction doesn't touch ordinary income — W-2 wages, most 1099 income, or the portion of a business sale allocated to inventory, depreciation recapture, or other ordinary-income items under Section 1245/1250 rules. Those still get taxed by Missouri like any other income. The benefit is specifically on the capital-gain component of a transaction, so a business sale with a mix of ordinary and capital components will still owe Missouri tax on the ordinary-income slice.
What This Means If You're Considering a Sale
If you've been sitting on appreciated assets and considering an exit, this is a reason to revisit the timing conversation with your CPA — not because tax law should ever be the only driver of a sale decision, but because the after-tax number just moved in your favor if you're a Missouri resident selling as an individual or through a pass-through entity.
If you're structured as a C corporation, don't assume this applies to you yet. Watch the trigger: once Missouri's top individual rate drops to 4.5% or lower, the corporate deduction activates. That's a rate to track if you're planning a multi-year exit strategy and have flexibility in your entity structure.
If you're weighing entity structure for a new venture, this is one more data point (among many — liability protection, self-employment tax, ability to raise capital, and more all matter) favoring pass-through treatment for a Missouri-based business you eventually plan to sell.
If you're not in Missouri, watch this space anyway. Missouri's move is explicitly framed as a first-in-the-nation experiment, and several other states have floated similar proposals in recent legislative sessions. A state you operate in adopting a similar exemption could change your own exit math within a year or two.
The Part That Doesn't Change: You Still Need Clean Records
None of this works if you can't substantiate your basis, holding period, and the nature of the gain when you file. A capital gains exemption is only as good as your ability to prove what the gain actually was — original purchase price, improvements, depreciation taken, and the split between capital and ordinary components on a business sale. That's especially true for gains built up over years or decades, where reconstructing basis from memory or lost paperwork becomes its own tax problem.
This is where day-to-day bookkeeping quietly pays for itself. An owner who has tracked asset purchases, capital improvements, and depreciation schedules cleanly for years walks into a sale — and the resulting tax filing — with a defensible number. An owner who hasn't is stuck reconstructing years of transaction history under time pressure, often at a CPA's hourly rate.
Keep Your Financial Records Exit-Ready
Whether or not you're in Missouri, a clean, auditable set of books is what turns a tax law change like this from a headline into real savings. Beancount.io offers plain-text accounting that gives you a complete, version-controlled history of every asset, basis calculation, and transaction — so when it's time to sell, your records are already exit-ready, not a reconstruction project. Get started for free and see why business owners are moving to plain-text accounting for the clarity it brings at the moments that matter most.