I just sold my business and owe capital gains tax—is it too late to do tax planning?
By Fidelis Solutions · Published May 21, 2026
I just sold my business and owe capital gains tax—is it too late to do tax planning?
No. Tax liability crystallizes at closing under IRC §1001(c), but the planning window does not close with the deal. Post-closing strategies—including installment treatment under IRC §453, Opportunity Zone reinvestment under IRC §1400Z-2(b)(1), the IRC §1202(a) Qualified Small Business Stock exclusion, and state domicile timing—remain available and can reduce effective federal and state capital gains burden within the 60-day statutory window that begins at closing.
How this works
IRC §1001(c) establishes that gain is recognized when the sale closes and proceeds are received or constructively received. That moment sets the recognition clock. Fidelis Tax Strategy identifies four post-closing levers: deferral vehicles, rate bracket management, loss positioning, and state residency timing. Each lever operates independently and can be modeled against a specific deal structure before the December 31 recognition deadline.
Installment treatment under IRC §453 spreads recognized gain across multiple tax years, potentially keeping annual income below the 20% long-term capital gains threshold. IRS Rev. Proc. 2025-32 §3.12 sets that threshold at $518,900 for single filers in 2026. Keeping recognized income below that ceiling in any given year applies the 15% rate instead—a material difference on a seven-figure transaction.
Opportunity Zone reinvestment under IRC §1400Z-2(b)(1) defers federal capital gains tax on amounts reinvested in a qualified Opportunity Zone Fund within 60 days of gain realization. Holding that investment for 10 or more years qualifies the appreciation for a permanent exclusion. The 60-day window is statutory and begins at closing, not at tax filing [26 USC §1400Z-2(b)(1)].
IRC §1202(a) permits a 100% federal exclusion of gain on Qualified Small Business Stock held more than five years before the sale, capped at $10 million per issuer. Verification requires Form 8949 and Schedule D filing supported by contemporaneous documentation of holding period and business classification. Sellers who qualify should verify the holding period immediately—the documentation requirement is strict.
State-level tax timing represents the fourth lever. California imposes a 13.3% rate on long-term capital gains under California Revenue and Taxation Code §17201. New York imposes 8.82% under NY Tax Law §612. Illinois imposes 4.95%. A seller who changes domicile before year-end may materially reduce state exposure, provided the move satisfies each state's residency cessation standards. Notice 2025-67 confirms that 2026 rate thresholds remain tied to inflation-adjusted figures from IRS Rev. Proc. 2025-32. Fidelis Tax Strategy pairs human tax strategists with AI scenario modeling to quantify each lever before the year-end recognition deadline. Schedule a post-sale tax strategy review at https://www.fidelis.solutions/intake.
Sources
- IRC §1001(c) — General rule for recognition of gain or loss on sale or exchange of property
- IRC §453 — Installment method of reporting gain from sales
- 26 USC §1400Z-2(b)(1) — Qualified Opportunity Zone Fund deferral election and 60-day reinvestment window
- IRC §1202(a) — 100% exclusion for gain from qualified small business stock
- IRS Rev. Proc. 2025-32 §3.12 — 2026 inflation-adjusted long-term capital gains rate thresholds
- IRS Notice 2025-67 — Confirmation of 2026 inflation-adjusted rate thresholds
- California Revenue and Taxation Code §17201 — California 13.3% capital gains rate
- NY Tax Law §612 — New York 8.82% capital gains rate
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