QSBSCalc

The §1045 rollover — when the 5-year clock isn't done

IRC §1045 lets a QSBS holder defer recognized gain by rolling the proceeds into replacement QSBS within 60 days of the sale. The deferred gain is recognized only when the replacement stock is eventually sold. The original holding period tacks onto the replacement for §1202 testing.

Last verified May 2026

When §1045 matters

A §1045 rollover is the corrective path when you've held QSBS for less than 5 years and don't qualify for the full §1202 exclusion (or, for post-OBBBA stock, when you want to preserve the chance at the 5-year tier instead of settling for a 3-year 50% or 4-year 75% partial). Instead of recognizing the full gain as a non- §1202 capital gain (and losing the chance to ever earn the §1202 exclusion), you roll proceeds into replacement QSBS and defer recognition.

The corrective-path role makes §1045 most valuable in the 6-month-to-5-year hold window. Under 6 months, §1045 is unavailable per §1045(a) (which incorporates the §1202(c)(2)(A) 6-month rule for the original stock). Over 5 years, you already have full §1202 exclusion under §1202(a)(4) so there's nothing to defer. The middle band — sold too early for full §1202, held long enough to use §1045 — is where the rollover converts a near-miss into a recoverable §1202 outcome.

The 60-day window

§1045(a)(1) requires the rollover to occur within 60 days of the original sale. The reinvestment must be into stock that itself qualifies as QSBS at the time of the replacement purchase — same §1202(c) original-issuance test, same §1202(d) gross-asset ceiling ($50M pre-OBBBA / $75M post-OBBBA), same §1202(e) active- business requirement at the replacement issuer.

§7503 weekend/holiday rules apply to the 60-day deadline: if day 60 falls on a Saturday, Sunday, or legal holiday, the deadline rolls to the next business day. Escrow arrangements where the replacement-purchase funds are committed but not yet released to the issuer are a frequent source of practitioner anxiety; the safer read is that the replacement purchase must be CLOSED within 60 days, not merely contracted or escrowed.

How basis works on the replacement

The replacement stock's basis equals the cost of the replacement, less the gain deferred under §1045(b)(3). This pushes the embedded gain into the replacement stock — if the replacement is held to 5+ years and then sold, the entire chain of gain (original deferred + new appreciation) can earn the §1202 exclusion at the replacement's sale.

Numerical example: Original QSBS sold for $5M gain. Roll $5M into replacement at $5M cost. Replacement basis under §1045(b)(3) = $5M cost − $5M deferred gain = $0. Replacement held 1+ year (with tacked 4y from original = 5y+), sold for $8M. Gain on replacement = $8M − $0 basis = $8M. §1202 exclusion at 5+ year tier, in-cap, 100% excluded under §1202(a)(4) (assuming the cap accommodates).

Holding period tacking — §1045(b)(4)

For purposes of §1202's 5-year test, the original stock's holding period tacks onto the replacement under §1045(b)(4) (which routes through §1223 via §1045(b)(5)). So if you held the original 4 years, rolled to replacement, and held the replacement 1 more year, you've satisfied the 5-year hold for the replacement's §1202 exclusion. The tacked period applies only to the §1202 5-year test — for other purposes (§1222 LTCG hold, NIIT, etc.) the replacement starts its own hold at the replacement purchase date.

Chained worked example — pre-OBBBA original, post-OBBBA replacement

Founder F received pre-OBBBA QSBS in Acme Inc. on 2022-09-01 at $0 basis. Acme is acquired for $5M cash on 2026-08-01 (3.92y hold). The acquisition recognizes $5M gain; F doesn't qualify for §1202 (under 5 years) and the pre-OBBBA rule has no tier-50%/75% fallback.

F rolls $4M of the proceeds into Beta Inc. QSBS on 2026-09-15 (45 days later, well within the 60-day window). Beta is a post-OBBBA C-corp at $40M gross assets (within the $75M ceiling). F holds Beta to 2028-09-15 (2.0y on the replacement; tacked holding period = 3.92y original + 2.0y replacement = 5.92y aggregate). Beta is acquired for $12M, of which F realizes $12M.

  • 2026 original sale ($5M gain): $4M rolled → §1045 defers $4M of gain. $1M un-rolled → ordinary LTCG, 20% + 3.8% NIIT = 23.8% = $238k federal.
  • Beta replacement basis: $4M cost − $4M deferred = $0.
  • 2028 Beta sale: gain = $12M − $0 basis = $12M. Tacked hold = 5.92y, satisfies post-OBBBA §1202(a)(4) 5-year tier. Cap = max($15M, 10 × $0 = $0) = $15M. In-cap $12M, 100% excluded. Federal §1202 tax = $0.
  • Total federal tax across the chain: $238k on the un-rolled $1M slice. The $11M+ of additional gain (deferred + new appreciation) flows through tax-free thanks to the §1045 chain.

Note the rule-set switch: original was pre-OBBBA, replacement is post-OBBBA. The replacement's rule set governs the cap, ceiling, and tier — see the pre vs post-OBBBA issuance pillar for the rule-set boundary mechanics. The holding period tacks under §1045(b)(4) for the 5-year test; the rule-set parameters do not tack.

Partial rollover

If you roll only part of the proceeds, the §1045(a)(2) deferral is proportional. The un-rolled portion is recognized as ordinary capital gain at sale; only the rolled slice is deferred. The deferred amount equals the LESSER of (a) the realized gain and (b) the rolled amount. Practitioners use partial rollovers to extract some liquidity while preserving §1202 eligibility on the rest.

Worked partial example: Sale gain $5M; roll $3M into replacement. Deferred gain = min($5M, $3M) = $3M. Recognized in year of sale = $5M − $3M = $2M. Replacement basis = $3M cost − $3M deferred = $0. Treatment of the $2M recognized portion depends on the original hold: under 6 months → short-term LTCG (ordinary rates); 6-month-to-5-year → long-term LTCG (20% + NIIT); post-OBBBA 3y+ → partial §1202 tier may apply if eligible.

Partnership and S-corp pass-through

§1045 applies to QSBS held by individuals (and certain pass-through entities per Treas. Reg. §1.1045-1). Partnerships can pass §1045 treatment through to partners under the regulations, but the mechanics require the partnership-level election + partner-level acceptance, with the deferral allocated to partners pro rata to their interest in the QSBS-realized gain.

Treas. Reg. §1.1045-1(b) governs partnership rollovers where the partnership itself sells QSBS and reinvests in replacement QSBS. Treas. Reg. §1.1045-1(c) governs the partner-level pass-through where the partnership distributes proceeds and the partner re-invests at the partner level. The two regimes have different documentary and election requirements — practitioners should retain copies of the partnership K-1, the §1045 election statement (per Treas. Reg. §1.1045-1, which largely superseded Rev. Proc. 98-48 in 2007), and the partner's personal §1045 election if pass-through is used.

The §1045 election statement

The §1045 election is documented per the §1045 election-statement requirements under Treas. Reg. §1.1045-1 (final regulations published 2007, which largely superseded Rev. Proc. 98-48) — a statement attached to the return for the year of the original sale identifying (1) the original QSBS sold, (2) the date and amount of the sale, (3) the replacement QSBS purchased, (4) the date and amount of the replacement purchase, and (5) the deferred-gain calculation. The election is irrevocable once the statute of limitations on the return year closes.

On Form 8949, the rolled portion is reported on Part II with adjustment code R in column (f) and the deferred amount as a negative adjustment in column (g). See the Form 8949 walkthrough for the line-by-line entries and the interaction with code Q for the §1202-excluded portion of any partial-rollover scenario.

Edge cases — escrows, installments, weekend deadlines

  • Escrow.Funds in escrow pending closing do not count as "invested in replacement QSBS" for §1045 purposes. The replacement purchase must close within the 60-day window.
  • Installment sale. §1045 applies to the gain recognized in the year of sale; installment-method gain recognized in later years cannot retroactively qualify. Practitioners electing out of §453 installment treatment to enable §1045 rollover is a known pattern.
  • Weekend deadline. §7503 rolls a weekend or legal-holiday deadline to the next business day. Day 60 falling on Saturday → deadline is Monday.
  • Replacement issuer disqualification mid-purchase. If between purchase agreement and closing the replacement issuer crosses the $50M / $75M gross-asset ceiling under §1202(d)(1), the replacement is not QSBS and §1045 is unavailable. The ceiling is tested at the replacement purchase date, not the agreement date.

§1045-vs-3-year-tier decision tree (post-OBBBA only)

Post-OBBBA stock at 3y hold has a choice: claim the §1202 50% tier exclusion at the §1202(a) 28% rate on the unexcluded slice, or sell and §1045-roll into replacement to chase the 5-year full exclusion.

  1. If gain is small and capped: 50% tier on $1M gain = $500k excluded, $500k × 28% = $140k federal. §1045 roll preserves the full $1M for the 5y tier at the cost of holding replacement for 2+ more years.
  2. If gain is large and over-cap: 50% tier captures partial value on the in-cap slice; over-cap slice is ordinary LTCG regardless. §1045 rolls only the rolled portion; over-cap considerations carry to the replacement.
  3. Replacement availability:§1045 is useless without a qualifying replacement. If you can't source replacement QSBS within 60 days, the 3-year tier is the only option.
  4. State conformity differential:§1045 deferral is recognized by most states because it's structured as a basis-reduction rollover rather than an exclusion. California conforms to §1045 despite decoupling from §1202; PA and NJ similarly conform on the §1045 leg.

Common-mistake ladder

  • Mistake 1: missing the 6-month minimum.§1045(a) (incorporating the §1202(c)(2)(A) 6-month rule) requires the original stock to have been held for at least 6 months. Earlier exits don't qualify for §1045.
  • Mistake 2: missing the 60-day window. Hard deadline; no extension mechanism. Track from the closing date, not the agreement date.
  • Mistake 3: rolling into non-qualifying replacement.Replacement must be QSBS at the replacement purchase date — original issuance, C-corp, under the gross-asset ceiling, active business. Secondary-market purchases fail §1202(c)(1) original-issuance and don't qualify as §1045 replacement.
  • Mistake 4: missing the §1045 election statement. Without the attached statement (per the §1045 election-statement requirements under Treas. Reg. §1.1045-1, which largely superseded Rev. Proc. 98-48 in 2007) on the return for the year of original sale, the §1045 election is not properly made and the deferral is at risk on audit.
  • Mistake 5: forgetting that the rule set follows the replacement's issuance date. Roll pre-OBBBA gain into post-OBBBA replacement and the replacement enjoys the post-OBBBA $15M cap, $75M ceiling, and tiered exclusion. See the pre vs post-OBBBA pillar.
  • Mistake 6: treating the §1045 election as revocable. Once made, the election is binding for the year of original sale. Reversing it requires an amended return within the statute of limitations.

State conformity bridge

§1045 is structured as a basis-reduction deferral, not an exclusion. Most states conform to §1045 even when they decouple from §1202:

  • California:conforms to §1045 deferral (Cal. Rev. & Tax. Code §18038 incorporates §1045) despite decoupling from the §1202 exclusion. CA taxes the eventual recognized gain at up to 13.3%, but defers in lockstep with federal.
  • Pennsylvania:partial conformity at 3.07% — verify with PA Schedule D specifically; deferrals generally flow through but exclusions don't.
  • New Jersey: NJ-1040 Schedule B treatment varies; verify with the current NJ Division of Taxation guidance.
  • Texas and other no-tax states: federal §1045 treatment is the entire picture.

The 50-state grid tracks current conformity positions per state.

Documentation to retain

  • Original QSBS sale documentation: stock-purchase / merger agreement, closing statement, proceeds wire confirmation, basis substantiation.
  • Replacement QSBS purchase documentation: subscription agreement, payment confirmation, closing date.
  • §1045 election statement (per the §1045 election-statement requirements under Treas. Reg. §1.1045-1, which largely superseded Rev. Proc. 98-48 in 2007) attached to the return for the year of original sale.
  • Replacement issuer attestation confirming the §1202(d)(1) gross- asset ceiling test at the replacement purchase date.
  • 60-day deadline calendar entry with calculated business-day deadline under §7503.
  • Partnership K-1 and pass-through election documentation if Treas. Reg. §1.1045-1(b) or (c) applies.

See the decoder for the chained-rollover compute, the Form 8949 walkthrough for the filing mechanics, the 5-year holding pillar for the §1202 hold-period interaction, and the cap pillar for the in-cap vs over-cap split that applies to the eventual replacement sale.

Informational, not tax advice. Consult a CPA or Enrolled Agent before acting on a corrective distribution.