When a merger, acquisition, or stock distribution leaves you with a fractional share, brokers at Fidelity, Vanguard, Schwab, and E*TRADE often pay cash-in-lieu instead of delivering a fraction. That cash is usually treated as a small taxable sale of the fractional piece—not free money and not automatically a nontaxable dividend. Pair this with Spin-off cost basis basics when the corporate action also allocates basis across tickers.
Where proceeds land at filing: 1099-B basis adjustment basics. Account wrapper: Taxable brokerage account basics. Filing orientation: Filing taxes for beginners.
Cash-in-lieu vs the main corporate action
| Piece | What happens | Typical tax flavor (confirm issuer/IRS) |
|---|---|---|
| Whole shares exchanged in a merger | You receive acquirer shares (and sometimes cash consideration) | May be nontaxable, partially taxable, or fully taxable per deal docs |
| Fractional leftover | Broker sells the fraction into the market / pool and remits cash-in-lieu | Often a taxable sale of that fraction |
| Reverse-split fractional | Same cash-in-lieu pattern after share-count math | Often a small taxable sale (Stock split cost basis) |
| Spin-off fractional | Cash for a fractional spinco share | Same “sale of fraction” pattern; still allocate basis first |
Always read the issuer’s merger FAQ, Form 8937 when basis changes, and the broker’s corporate-action notice. Do not assume “cash from a merger” is all capital gain or all dividend.
How basis usually works on the fraction (educational pattern)
- Start with your pre-deal basis in the lots that produced the fraction (after any required allocation).
- Compute the fractional share’s allocated basis (for example 0.4 share × post-deal per-share basis).
- Cash-in-lieu proceeds minus that fractional basis ≈ gain or loss on the fraction.
- Holding period for the fraction typically tacks to the underlying lot—confirm with the notice and a preparer.
- Whole shares that remain keep their allocated basis for later sales (Tax lot identification).
Brokers may report cash-in-lieu on Form 1099-B with covered-lot basis. Spot-check one line so Schedule D / Form 8949 does not double-count or leave basis at zero.
Worked example: $48 cash-in-lieu on a 0.4 share
Casey held 100 shares of TargetCo with $5,000 total basis ($50/share) in a Schwab taxable account. AcquirerCo merges TargetCo at 1 Acquirer share per Target share, plus cash for fractions. After the exchange Casey is entitled to 100.4 Acquirer shares; Schwab pays $48 cash-in-lieu for the 0.4 share at a $120 post-deal price (illustrative).
Allocated basis on the 0.4 fraction: 0.4 × $50 = $20 (if basis carried dollar-for-dollar into Acquirer under this deal’s rules—confirm Form 8937). Gain on the cash-in-lieu ≈ $28 ($48 − $20). The remaining 100 Acquirer shares keep $4,980 of basis ($49.80/share) for later sales.
If Casey ignored the $20 basis and treated $48 as pure income with zero basis, Form 8949 would overstate gain by about $20. If Casey treated the $48 as nontaxable “merger noise,” the 1099-B line would still need an answer at filing.
Practical habits
- Download the issuer merger / Form 8937 packet the week of closing.
- Find the cash-in-lieu line on the broker’s corporate-action report and on Form 1099-B.
- Allocate basis to the fraction before computing gain—do not leave basis at $0 by default.
- Keep pre-deal confirms; they still prove acquisition date for holding-period tacking.
- Separate cash merger consideration on whole shares (deal-specific) from fractional cash-in-lieu.
- Index-fund holders: the fund’s capital-gain distribution inside the wrapper still dominates day-to-day taxes (Investing basics for beginners).
Checklist
- Confirm whether the issuer describes the deal as nontaxable, partially taxable, or taxable.
- Locate cash-in-lieu proceeds and the fractional share count.
- Allocate basis to the fraction; compute gain/loss vs proceeds.
- Reconcile broker 1099-B to your lot spreadsheet before year-end.
- Do not skip a small cash-in-lieu line because the dollar amount looks trivial.
- At filing, match Form 8949 / Schedule D to both the main exchange (if any) and the fraction sale (1099-B basis adjustments).
Corporate tender offers with cash vs stock consideration on Form 1099-B: Tender offer tax basics.
Educational only. Not tax, legal, or investment advice. Merger tax treatment and cash-in-lieu reporting are deal-specific; verify with current IRS publications, the issuer’s Form 8937, Form 8949 / Schedule D instructions, and a qualified tax professional.