How Much of Your Gain Could an Opportunity Zone Fund Save? Run the Numbers

Sold a property, a business or a stock position at a big gain? Before you write the check, it is worth seeing what the same gain looks like inside a Qualified Opportunity Fund under the updated program, OZ 2.0, which applies to gains invested after December 31, 2026.

The free Opportunity Zone tax calculator for OZ 2.0 shows what you would owe if you pay the tax now, and what you could keep by investing the gain in an Opportunity Zone fund instead.

The three OZ 2.0 benefits the calculator models

Deferral

Tax on the reinvested gain is due when you sell or five years after you invest, whichever comes first.

Step-up

Hold five years and your basis rises by 10% of the deferred gain, or 30% in a qualified rural opportunity fund (QROF). The calculator has a Rural / Non-rural toggle and starts on Non-rural.

Exclusion

Hold 10 years or more and you can elect a fair-market-value basis, so appreciation on the investment is not taxed. If you hold past 30 years, basis is set at the value on the 30-year date.

How to use it

Enter your capital gain and your state. The calculator applies your state's capital gains rate along with federal tax to show how much of the gain would go to tax this year and how much you would keep. Then it walks through the Opportunity Zone path on the same gain. The page cites IRS Notice 2026-55 as its source.

The site also has a worked example of what the rural 30% step-up is worth on a $500K gain, and an Opportunity Zone tax benefits guide.

Step by step: running your gain

1. Open the OZ 2.0 tax benefits calculator.
2. Enter your capital gain. The default is $500K.
3. Pick your state. The calculator shows the state capital gains rate it is applying.
4. Choose Non-rural (10% step-up) or Rural (30%).
5. Read what you would keep if you pay the tax now, then scroll to the Opportunity Zone path.

Hypothetical example: state matters

Hypothetical example, using the calculator's own defaults. With a $500K gain and California selected, the calculator applies a 13.3% state rate on top of federal tax and shows $185,500 going to tax, 37.1% of the gain, leaving $314,500. Change the state to one with no income tax and the "pay now" figure drops. The Opportunity Zone path changes too. That is why the calculator asks for your state first.

The three benefits, in order

The OZI tax benefits guide describes them as deferral, reduction and elimination:

• Deferral: under OZ 2.0, tax on the reinvested gain is due at the earlier of a sale or five years after investing.
• Reduction: the 10% (or 30% rural) step-up after five years.
• Elimination: after 10 years, an election to use fair market value basis, so appreciation is not taxed.

You do not have to choose; they stack. To qualify, you invest the gain in a QOF within 180 days, and the fund must invest in qualified opportunity zone property or businesses.

Who uses it

Sellers with large gains from a home, an investment property, a business or stock, and the agents and advisers who work with them.

Common mistakes

• Running the numbers without your state. It is a large part of the result.
• Picking Rural without confirming the fund qualifies. The 30% step-up needs a qualified rural opportunity fund.
• Using the result as a promise. It is an estimate based on the rules the page cites, IRS Notice 2026-55.
• Forgetting the 180-day window. Check it with the 180-day calculator.

Questions to bring to your CPA or adviser

The tool gives you a starting point. Before you act, these are worth asking:

• What is my actual combined federal and state rate on this gain?
• Is my gain eligible to be deferred through a QOF?
• When does my 180-day window close, and does it cross January 1, 2027?
• Is the fund rural or non-rural, and how is that confirmed?
• How much cash will I need in year five to pay the tax on the deferred gain?
• What happens if I sell before year ten?

Where this fits for luxury sellers and buyers

State tax makes a big difference. A seller in a high-tax state sees a very different result from one in a no-income-tax state, and luxury markets are concentrated in both kinds of places. Run the calculator with your own state before your closing so your financial plan reflects real figures, not rules of thumb.

More free Opportunity Zone tools

This is one of several free planning tools in the Opportunity Zone tools library on Opportunity Zone Invest. Want to compare it with a 1031 exchange? Use the 1031 vs DST vs Opportunity Zone tool.

FAQ

Not tax advice. Tool outputs are estimates based on the figures you enter and current published rules. Investors get Opportunity Zone tax benefits only by investing through a Qualified Opportunity Fund. Talk to a CPA or tax attorney before you act.