Opportunity Zone Calculator
Model a qualified opportunity fund investment under the post-OBBBA rules — rolling five-year deferral, 10% or 30% rural step-up, and the ten-year exclusion that dwarfs both.
Opportunity Zone Calculator
Results recalculate instantly on every keystroke. Nothing you type is transmitted.
What this result does not account for
- Rules change on 1 January 2027; confirm zone status before committing.
- Federal treatment only — several states do not conform.
- Assumes the gain is eligible and invested within the 180-day window.
In short: You invest only the GAIN, not the proceeds. On a 428,563.83 gain that frees 755,336.24 of basis a 1031 would have trapped — and after ten years the fund's own appreciation is federally tax free.
Formula
tax due = gain × (1 − step-up) × rate
ten-year exclusion = fund appreciation × rate, entirely
[('eligible gain', 'capital gain only — not proceeds'), ('step-up', '10% standard, 30% rural, at five years'), ('deferral', 'rolling five years from the investment date'), ('exclusion', 'post-investment appreciation, tax free at ten years')]
Worked Example
- Roll only the GAIN into the fund — keep your basis.
- Defer the tax for five years from your investment date.
- Take the 10% step-up, or 30% in a qualified rural fund.
- Pay tax on the reduced gain when deferral ends.
- Hold ten years and exclude the fund's own appreciation entirely.
A 428,563.83 gain at a combined 23.8% carries 101,998.19 of tax. A 10% step-up leaves 385,707.45 taxable, so 91,798.37 is due — saving 10,199.82. A rural fund's 30% step-up saves 30,599.46, exactly three times as much. But the real prize is the ten-year exclusion: if the fund grows to 900,000, the 471,436.17 of appreciation escapes federal tax entirely, worth 112,201.81. And because only the gain is invested, 755,336.24 of returned capital stays free — money a 1031 would have required you to reinvest.
Strengths & Limits Of This Model
Where this engine is strong
- Applies the post-OBBBA 10% and 30% step-ups correctly
- Quantifies the capital a 1031 would have trapped
- Declines the ten-year exclusion below a ten-year hold
Where it stops
- Rules in transition
- Federal only
Practical Use Cases
Comparing against a 1031
Weighing freed capital against indefinite deferral.
Timing a 2027 investment
Modelling the rolling deferral under the new rules.
Evaluating a rural fund
Sizing the 30% step-up against a standard fund.
Planning for the deferral bill
Holding liquidity for tax on an illiquid position.
Diversifying out of real property
Deferring a gain without a like-kind constraint.
Methodology & Editorial Standards
Tax on the deferred gain is computed at the combined capital gains and net investment income rate, reduced by the selected basis step-up — ten per cent standard or thirty per cent rural, both at five years, per the post-OBBBA rules. The ten-year exclusion is applied to fund appreciation above the invested gain and only where the hold reaches ten years, otherwise it is declined rather than assumed. The comparison against a 1031 is expressed as the capital freed, which is net proceeds less the gain — the structural distinction between the two regimes.
Computation runs in IEEE-754 double precision at full internal precision; rounding to two decimal places occurs strictly at the display layer, so no cumulative drift enters the result. All monetary outputs use accounting presentation — grouped thousands, two decimals, negatives in parentheses — so figures can be transcribed directly into a model or working paper. Division-by-zero and out-of-domain inputs return an em-dash rather than a misleading number.
This engine was reconciled against an independent reference implementation and hand-verified for the worked example above before release. Our full five-stage review process is published on the About Us page.
Disclaimer. This calculator is provided for informational and modelling purposes only and does not constitute financial, tax, legal, medical, or engineering advice. Verify all figures with a qualified professional before acting on them.
Opportunity Zone Calculator — 10 Expert FAQs
10 analyst-written answers to the questions practitioners actually ask — optimised for voice and answer-engine retrieval.
What is a qualified opportunity fund?
An investment vehicle that holds at least ninety per cent of its assets in qualified opportunity zone property. Rolling an eligible capital gain into one within one hundred and eighty days defers tax on that gain, and a long enough hold makes the fund's own appreciation federally tax free.
How is this different from a 1031 exchange?
Two structural differences. You invest only the GAIN rather than the full net proceeds, so your returned capital stays free — and there is no like-kind requirement, so you are not locked into real property. In exchange, the deferral is finite rather than indefinite.
What changed under the OBBBA?
The programme became permanent, deferral became a rolling five years from the investment date instead of a fixed 2026 deadline, the seven-year fifteen per cent step-up was removed, and a thirty per cent step-up was created for qualified rural funds. New zone designations take effect on 1 January 2027 on a tighter income test.
What is the ten-year exclusion?
Hold the fund interest for at least ten years and you may elect to step your basis to fair market value on disposition, which eliminates federal tax on all appreciation since you invested — including recapture on the fund's own depreciation. It is by far the largest benefit and it dwarfs the step-up.
What is a rural opportunity fund?
A fund investing substantially all of its assets in opportunity zones located entirely within rural areas. It carries a thirty per cent basis step-up rather than ten, and a reduced substantial improvement threshold of fifty per cent instead of one hundred, which makes existing rural buildings far easier to qualify.
When does the deferred tax become payable?
Under the post-2027 rules, at the earlier of five years from your investment or the date you dispose of the fund interest. The practical problem is that the bill arrives while your money is still locked in an illiquid fund, so hold cash for it separately.
Can I invest more than my gain?
You may, but only the gain portion receives the tax benefits. The excess is treated as a separate non-qualifying investment with no deferral, no step-up and no ten-year exclusion, so most investors keep the two in separate vehicles to avoid the bifurcation.
What happens at death?
Unlike a 1031, a fund interest does NOT receive a stepped-up basis for the deferred gain, which is treated as income in respect of a decedent. Your heirs inherit the liability along with the position, though they may still access the ten-year exclusion on appreciation.
How long do I have to invest the gain?
Generally one hundred and eighty days from the date of the sale that produced it, with special timing rules for gains flowing through a partnership. This is the same window length as a 1031 closing deadline, but it applies to making the fund investment rather than to buying property.
Is the tax benefit worth the investment risk?
That is the question the programme most often gets wrong. A tax incentive cannot rescue a bad investment: the ten-year exclusion is worth a great deal on appreciation and nothing at all on a fund that does not appreciate. Underwrite the underlying real estate first, then count the tax benefit.