Cash in Lieu of Fractional Shares on Your 1099-B — How to Report It

There's a line on your 1099-B for $4.37. The description says "CASH IN LIEU" or "CIL FRACTIONAL SHARE," the cost basis column is blank, and you have no memory of selling anything. You didn't. A company you own did something corporate — a split, a spinoff, a merger — and the math left you with a fraction of a share that nobody wants to issue.

It's four dollars. It's also a reportable securities transaction that the IRS received a copy of, and leaving it off is the kind of trivial omission that generates a very non-trivial notice. This guide covers what cash in lieu is, how to figure the basis of a fractional share, when it's a sale versus a dividend, and how to report it without spending an hour on four dollars.

What Cash in Lieu Is

Companies don't issue fractional shares in corporate actions. When a transaction leaves you with a fraction, the company sells it on the open market and sends you the proceeds. That payment is cash in lieu of fractional shares.

The events that produce it:

• Stock splits with awkward ratios. A 3-for-2 split on 101 shares gives you 151.5 shares. You get 151 shares and cash for the half.
• Reverse splits. A 1-for-10 reverse split on 1,234 shares gives you 123.4 shares — cash for the 0.4.
• Spinoffs. The distribution ratio rarely divides evenly into your position.
• Mergers and acquisitions. Exchange ratios like 0.7 shares of the acquirer per share held almost always produce a fraction.
• DRIP terminations. Reinvestment plans accumulate fractional shares over years; closing the position or transferring the account cashes them out.
• Mutual fund and ETF conversions. Share class changes and fund mergers do the same thing.

The amounts are typically between one and fifty dollars, which is exactly why they get ignored.

It's a Sale, and It's Taxable

Cash in lieu is treated as a sale of the fractional share. You compute gain or loss the normal way — proceeds minus basis — and report it as a capital transaction.

The holding period tacks. The fractional share inherits the holding period of the shares it came from. If you'd held the original position for six years, the fraction is long-term, even though the fraction itself only existed for a day. This is worth getting right when the amounts are larger.

Why it's usually a sale and not a dividend. There's a technical question here. In a reorganization, a cash payment to a shareholder can be treated as a dividend rather than a sale in some circumstances. But the IRS has long held that when cash in lieu is paid solely to avoid the expense and inconvenience of issuing fractional shares — which is the case in essentially every retail situation — it's treated as a redemption of the fraction, giving you sale or exchange treatment.

Practically: report it as a sale. The rare exception is a transaction structured to distribute cash disproportionately, and the company's tax information statement will say so explicitly if it applies.

Figuring the Cost Basis

This is the only genuinely fiddly part, and it's why the basis column is so often blank — your broker frequently doesn't know it.

The principle: allocate a proportional slice of your basis to the fraction.

Case 1 — Stock split. Your total basis doesn't change in a split; it just spreads across more shares.

You own 101 shares with a total basis of $5,050 ($50 per share). A 3-for-2 split gives you 151.5 shares. New per-share basis: $5,050 ÷ 151.5 = $33.33. The 0.5 fractional share carries $16.67 of basis. You receive, say, $17.20 in cash. Gain: $0.53.

Case 2 — Reverse split. Same principle, opposite direction. 1,234 shares with $12,340 total basis, 1-for-10 reverse split, leaves 123.4 shares at $100 per share basis. The 0.4 fraction carries $40 of basis.

Case 3 — Spinoff. Harder, because you first allocate your original basis between the parent and the spun-off entity using the relative fair market values the company publishes in its Form 8937. Only then do you compute the per-share basis of the spinoff shares and apply it to the fraction. See stock spinoff and merger cost basis for the allocation itself.

Case 4 — Merger. Allocate your basis in the old shares across the new shares received per the exchange ratio, then apply the resulting per-share basis to the fraction.

Case 5 — DRIP fractional shares. Each reinvested dividend bought shares at that day's price and created its own tax lot. The fractional remainder's basis depends on which lot it came from under your cost basis method. See DRIP and dividend reinvestment cost basis.

Where to find the numbers. The company files Form 8937, "Report of Organizational Actions Affecting Basis of Securities," for any action that changes shareholder basis, and posts it in the investor relations section of its website. It gives the exact allocation percentages. For any corporate action bigger than a routine split, that document is the authoritative source.

When the basis is genuinely $4 and the effort isn't worth it. Reporting $0 basis is always permissible — it overstates your gain and overpays tax, and the IRS will never object. On a $4.37 payment the difference is cents. Do the arithmetic when the amount is meaningful and take the $0 shortcut when it isn't, but report the transaction either way.

How to Report It on Form 8949

Same as any other sale.

• Description — as shown on the 1099-B, typically "CASH IN LIEU [TICKER]" or "FRACTIONAL SHARE [TICKER]"
• Date acquired — when you acquired the original shares. For multiple lots, "Various" is acceptable
• Date sold — the corporate action date from the 1099-B
• Proceeds — the cash amount, matching the 1099-B exactly
• Cost basis — your allocated figure, or zero if you're taking the shortcut
• Holding period — inherited from the original shares, so usually long-term

Which box? Cash in lieu is almost always reported as noncovered, since the broker doesn't have the basis allocation. That means Box B (short-term) or Box E (long-term) on Form 8949 — see Box D vs E vs F.

One practical note: because these are noncovered, they can't use the Schedule D line 1a or 8a shortcut. Even a $4 cash-in-lieu line has to be itemized on Form 8949. Our Schedule D instructions cover why.

If it's not on any 1099-B, which happens with transfer agent payments and some DRIP plans, it's Box C or Box F instead — and it's still reportable. See reporting stock sales with no 1099-B.

Why Bother Over Four Dollars

Because the IRS received the form.

The matching system compares proceeds reported to it against proceeds reported on your return. It doesn't apply a materiality threshold. A $4.37 discrepancy can generate a CP2000 notice that costs you an afternoon to answer — and if you assume the proposed assessment is right rather than reading it, the IRS's zero-basis assumption means you'd be agreeing to tax on the full $4.37.

The asymmetry is the whole argument. Reporting it takes thirty seconds. Not reporting it has a small chance of costing an hour.

Note also that these lines are easy to miss when importing. They often sit in a separate section of the 1099-B, away from your regular trades, and truncated imports drop them first.

FAQ

What does "cash in lieu" mean on a 1099-B?

Cash paid instead of a fractional share, arising when a stock split, spinoff, merger, or similar corporate action leaves you with a fraction. The company sells the fraction and sends you the proceeds.

Is cash in lieu of fractional shares taxable?

Yes. It's treated as a sale of the fractional share, producing capital gain or loss.

Why is the cost basis blank on my cash in lieu?

Because your broker usually can't compute the basis allocation for a fractional share arising from a corporate action. You supply it.

Can I just report $0 basis?

Yes. It overstates your gain slightly and overpays tax by pennies on typical amounts. That's a reasonable trade when the payment is a few dollars.

Is cash in lieu short-term or long-term?

It inherits the holding period of the shares that produced the fraction. If you held the original position more than a year, it's long-term.

Do I have to report a $3 cash in lieu payment?

Yes, if it appears on a 1099-B. The IRS matching system has no minimum threshold.

Where do I find the basis allocation for a spinoff or merger?

Form 8937 on the company's investor relations site. It gives the official allocation percentages for any action affecting shareholder basis.

Is cash in lieu a dividend?

Generally no. When paid solely to avoid issuing fractional shares, it gets sale or exchange treatment. The company's tax statement will say if a transaction is structured otherwise.

Bottom Line

Cash in lieu is a real securities sale for a trivial amount, and the only reason it causes trouble is that people either ignore it or spend an hour computing a basis worth four dollars.

The proportional split of your basis is the correct answer and is worth doing when the amount is meaningful. When it isn't, report zero basis and move on. What you cannot do is leave the line off — the IRS has the form, and matching doesn't care that it's four dollars.

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Cash in lieu lines buried in a 400-page 1099-B? Try it on your 1099-B — upload the PDF and get every transaction extracted, including the small corporate action lines that truncated imports drop first, with dates and proceeds intact.