Cash in Lieu: What It Means on Your Tax Return and 1099

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Meta Description: Cash in lieu of fractional shares is taxable when you receive it from mergers or stock splits. Learn how to report cash in lieu on your 2025 tax return.

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      "text": "Cash in lieu (CIL) is money paid instead of issuing fractional shares during corporate actions like mergers, stock splits, or spin-offs. When a company undergoes a merger with a share exchange ratio that would result in fractional shares, brokers sell the fractional portion and pay you cash instead. This cash is taxable and reported on Form 1099-B as proceeds from a sale. You must report the cash in lieu on Schedule D, calculating capital gain or loss based on your original cost basis allocated to the fractional share."
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H1

Cash in Lieu: What It Means on Your Tax Return and 1099

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ANSWER SECTION

Cash in lieu (often abbreviated as CIL or "cash in lieu of fractional shares") is money paid to you instead of issuing fractional shares during corporate transactions like mergers, acquisitions, stock splits, or spin-offs. When a company action results in you being entitled to a partial share—for example, receiving 2.5 shares in a merger—the broker typically sells the fractional share (0.5) and pays you cash for its value. For 2025 tax purposes, this cash is treated as a taxable sale of stock and must be reported on your tax return. Your broker reports cash in lieu on Form 1099-B, and you must calculate the capital gain or loss by allocating a portion of your original cost basis to the fractional share that was sold.

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H2: When Cash in Lieu Occurs

Cash in lieu most commonly happens during these corporate actions:

Mergers and acquisitions:

• Company A acquires Company B
• Exchange ratio: 1.5 shares of A for each share of B
• If you owned 10 shares of B, you receive 15 shares of A—no fractional shares
• But if you owned 11 shares of B, you receive 16.5 shares
• The 0.5 share is sold, and you receive cash in lieu

Stock splits:

• Company announces 3-for-2 stock split
• You own 25 shares
• After split: 37.5 shares
• The 0.5 share becomes cash in lieu

Reverse stock splits:

• Company announces 1-for-10 reverse split
• You own 105 shares
• After split: 10.5 shares
• The 0.5 share becomes cash in lieu

Spin-offs:

• Parent company spins off subsidiary
• Shareholders receive fractional shares of new company
• Fractional shares are sold for cash

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H2: Tax Treatment of Cash in Lieu

Taxable event: Cash in lieu is treated as a sale of the fractional share, creating a taxable capital gain or loss.

Reporting requirements:

• Report on Schedule D (Capital Gains and Losses)
• Transfer to Form 8949 (Sales and Other Dispositions of Capital Assets)
• Reported by broker on Form 1099-B

Character of gain/loss:

• Short-term: If you held the original shares one year or less
• Long-term: If you held the original shares more than one year
• The holding period carries over from your original shares

Calculating gain or loss:

Cash Received (Proceeds)
- Allocated Cost Basis of Fractional Share
= Capital Gain or Loss

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H2: How to Calculate Your Cost Basis

Determining the correct cost basis for the fractional share requires allocation:

Method 1: Pro-rata allocation Allocate your original cost basis proportionally to the fractional share.

Example calculation:

• Original shares owned: 100 shares
• Original total cost basis: $5,000 ($50 per share)
• Merger exchange ratio: 1.5 to 1
• New shares received: 150 shares
• Cash in lieu received for: 0.5 fractional share

Allocation:

• Fractional share portion: 0.5 ÷ 150 = 0.00333 (0.333%)
• Cost basis allocated: $5,000 × 0.00333 = $16.67
• Cash in lieu received: $25.00
• Capital gain: $25.00 - $16.67 = $8.33

Method 2: Fair market value allocation Some brokers allocate based on fair market value at the time of the corporate action.

Documentation needed:

• Keep records of your original purchase
• Save corporate action notifications
• Retain Form 1099-B statements
• Document your basis calculation

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H2: Reporting Cash in Lieu on Your Tax Return

Step 1: Receive Form 1099-B Your broker sends Form 1099-B showing:

• Box 1d: Proceeds (cash received)
• Box 1e: Cost basis (may be $0 or incomplete—verify!)
• Box 2: Short-term or long-term gain/loss indicator

Step 2: Complete Form 8949 Report each cash in lieu transaction:

• Column (a): Description ("XYZ Corp fractional share")
• Column (b) and (c): Date acquired (original purchase date)
• Column (d): Date sold (corporate action date)
• Column (e): Proceeds (cash received)
• Column (f): Cost basis (your calculated amount)
• Column (g): Adjustment code and amount (if needed)
• Column (h): Gain or loss

Step 3: Transfer to Schedule D Carry totals from Form 8949 to Schedule D.

Step 4: Include in Form 1040 Capital gains flow to your main tax return.

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H2: Common Issues and Mistakes

Incorrect basis reporting: Brokers sometimes report $0 basis for cash in lieu, which overstates your gain. You must calculate and report the correct allocated basis.

Missing the transaction: Small cash in lieu amounts ($1-10) are easy to overlook but are still taxable and reportable.

Wrong holding period: The holding period carries from your original shares. Don't use the corporate action date as your acquisition date.

Aggregation errors: Each cash in lieu event is a separate transaction. Don't aggregate multiple events into one line item.

Wash sale complications: If you repurchase shares of the same company within 30 days, wash sale rules may apply (though this is rare with cash in lieu).

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H2: Related Tax Questions

Learn about general interest income reporting in our guide on taxable interest covering Form 1099-INT and reporting requirements.

Understand cancellation of debt income in our guide on 1099-C form explaining when forgiven debt becomes taxable.

Explore backup withholding rules in our guide on backup withholding covering when the IRS requires withholding on investment income.

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