Installment Sale Gain and Opportunity Zones: Timing the 180 Days
Installment sale gain can be deferred into a qualified opportunity fund (QOF) one payment at a time. Under Reg. §1.1400Z2(a)-1(b)(11)(viii), gain you recognize under the installment method is eligible gain, and you may start each 180-day investment window either on the date you receive a payment or on the last day of that tax year. Only the gain portion needs to be invested, not the full payment. For money invested after December 31, 2026, the rebuilt Opportunity Zone rules give a rolling five-year deferral, a 10% basis step-up at five years, and tax-free growth after ten years.
This page walks through the timing, runs a labeled simple example, and explains the 2026 handoff. For how installment gain is measured in the first place, see the installment sale guide.
The rule in the regulation
The key text, from Reg. §1.1400Z2(a)-1(b)(11)(viii)(B):
"For gains reported on the installment method, an eligible taxpayer may treat the date the payment on the installment sale is received or the last day of the taxable year in which the eligible taxpayer would have recognized the gain under the installment method as the beginning of the 180-day period ... if an eligible taxpayer receives one or more payments on an installment sale and treats the date the payment on the installment sale is received as the beginning of the 180-day period, each payment will begin a new 180-day period."
The statute defers "so much of such gain as does not exceed the aggregate amount invested by the taxpayer in a qualified opportunity fund during the 180-day period" (§1400Z-2(a)(1)(A)). So you invest dollars equal to the gain, and your principal recovery stays yours.
| Choice | 180-day window starts | Best when |
|---|---|---|
| Payment-date method | Each payment's receipt date | You want to invest as cash arrives |
| Year-end method | December 31 of the year the gain is recognized | You want to pool a year of payments and invest once |
The regulation also confirms this applies to installment sales that occurred before December 22, 2017, so an old note still throwing off gain can qualify, subject to the 2026 handoff below.
Which part of each payment is eligible
Each principal payment splits into basis recovery and gain at your gross profit percentage. Interest is ordinary income and is not eligible. Recapture is also out:
| Piece of the payment | Eligible for QOF deferral? |
|---|---|
| Interest | No |
| Basis recovery | Not gain, nothing to defer |
| §1245 recapture | No, and it is taxed in the year of sale anyway under §453(i) |
| Ordinary §1250 recapture | No |
| Unrecaptured §1250 gain (25% maximum) | Yes; it keeps its 25% character when later included |
| §1231 gain above recapture | Yes |
| Other long-term capital gain | Yes |
On recapture timing, see installment sale depreciation recapture. When deferred gain is later included, Reg. §1.1400Z2(a)-1(c)(1)(i) says it keeps the attributes it would have had, so a 25% gain comes back as 25% gain.
Old rules vs new rules: the 2026 handoff
| Invested on or before Dec. 31, 2026 | Invested after Dec. 31, 2026 | |
|---|---|---|
| Deferral ends | December 31, 2026 (or earlier sale) | Earlier of sale or 5 years after the investment |
| Basis step-up | Old 10% and 15% steps mostly unreachable now | 10% at 5 years; 30% for a qualified rural fund |
| 10-year exclusion | Yes, under old rules | Yes; fair market value basis on sale, capped at year-30 value |
| Zone map | Current designations | New designations from the July 1, 2026 determination date |
| Source | §1400Z-2(b)(1)(B); Reg. §1.1400Z2(a)-1(b)(40) | §1400Z-2 as amended by P.L. 119-21 §70421 |
Two practical consequences for a seller on a note:
- Installment gain invested in late 2026 buys almost nothing. Under the old rules, remaining deferred gain is taxed on December 31, 2026. The regulation puts it plainly: after that date "an eligible taxpayer's remaining deferred gain is $0."
- Payments in 2027 and later line up with the new program. Amounts invested after 2026 get the rolling five-year clock. Each investment has its own clock, so a note paying every year creates a ladder of five-year inclusion dates.
Transition questions, such as how an installment sale closed before 2027 interacts with investments made after 2026, are addressed in IRS transitional guidance (Notice 2026-40). Confirm your specific timing with your CPA before relying on it.
Simple example: a note feeding a fund
Simple example. Assumptions: you sell land for $1,500,000 with a $300,000 basis on a note. Gross profit percentage: ($1,500,000 minus $300,000) divided by $1,500,000 = 80%. The buyer pays $200,000 of principal each year in 2027 through 2033 plus interest after a $100,000 down payment in December 2026. No depreciation. You use the payment-date method.
| Payment | Principal | Gain (80%) | Invest by | Deferred gain taxed | Taxed amount after 10% step-up if held 5 years |
|---|---|---|---|---|---|
| Dec. 2026 down payment | $100,000 | $80,000 | Old rules: taxed Dec. 31, 2026 | 2026 | No step-up; little point investing |
| Mar. 1, 2027 | $200,000 | $160,000 | Within 180 days | 2032 (5 years after investment) | $144,000 |
| Mar. 1, 2028 | $200,000 | $160,000 | Within 180 days | 2033 | $144,000 |
| Later years | $200,000 each | $160,000 each | Each within 180 days | 5 years after each | $144,000 each |
You invest $160,000 from each $200,000 payment and keep the $40,000 basis recovery. The fund pays you nothing on schedule, so the tax on the $144,000 in year five comes out of your pocket. If you hold a fund interest ten years, growth on it is excluded when you sell (subject to the 30-year cap).
Model the note's cash flow and tax by year in the calculator.
Opportunity zone fund vs just holding the note
| Keep the installment note | Invest note gain in a QOF | |
|---|---|---|
| Cash to you | Interest plus principal on schedule | Only the basis portion of each payment |
| Gain taxed | As each payment arrives | 5 years later, 10% smaller |
| Growth | None; fixed interest | Fund's growth, tax-free after 10 years |
| Risk | Buyer default, secured by the property | Fund and real estate risk; illiquid |
| Suspended passive losses | Meet the gain as it arrives | Have nothing to offset while gain is deferred |
The note is income; the fund is a growth bet. They can be combined, but the fund is a security with its own risks and fees. Hans does not sell QOF interests.
If you are still deciding whether to spread the gain at all, see installment sale vs lump sum. Reporting still runs through Form 6252 for the installment gain, with the deferral election made on Form 8949 and the fund investment tracked on Form 8997.
Bottom line
Installment gain can go into an opportunity fund payment by payment, and each payment can start its own 180-day clock. Invest only the gain, not the recapture or interest. Money invested before 2027 buys almost no deferral; payments received and invested after 2026 fit the new five-year rolling program. Treat it as an investment decision first and a tax decision second.
Questions to ask your CPA
- Should I use the payment-date or the year-end 180-day method for my note?
- How much of each payment is eligible gain after recapture?
- Does Notice 2026-40 affect how my pre-2027 sale's later payments can be invested?
- Can I afford the tax due at five years if the fund has not paid anything?
- Is the fund a qualified rural opportunity fund, and does that change the step-up?
- How will we report the deferral on Form 8949 and track it on Form 8997?
Run your own numbers. Compare a cash sale, seller financing and a structured installment sale side by side, free.
Educational only, not tax, legal or investment advice. Examples are illustrative. Have your CPA or tax attorney review your facts before you act. Hans Goldstein is a licensed insurance agent (CA Insurance License #4273294) and is not a CPA or attorney. He is paid a commission only if a structured installment sale is funded; seller financing pays him nothing. Disclosures.