fyllyoTax Forms
Form 8949
Sales and Other Dispositions of Capital Assets
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Form reference
Before you begin.
Use these notes as a starting point. Check the issuing agency’s current form and instructions for your client’s situation.
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Prepare Your Capital Asset Transaction Data
Gather all information about your capital asset sales: dates of acquisition and sale, property descriptions, proceeds, cost basis, and any adjustments. You can have this in a spreadsheet, document, or even handwritten notes - Fyllyo's AI will understand it.
Details worth checking
Incorrect or Missing Transaction Dates
One of the most common mistakes is entering incorrect dates for acquisition (Column b) or sale (Column c). Wrong dates can misclassify transactions as short-term vs. long-term, affecting your tax rate. Missing dates will cause the IRS to reject your filing.
Incomplete Property Descriptions
Column (a) requires detailed descriptions including the number of shares and stock ticker symbols. Vague descriptions like 'various stocks' or missing ticker symbols make it difficult for the IRS to verify transactions and may trigger audits.
Mismatched Proceeds and Basis Amounts
The proceeds (Column d) must match amounts reported on Form 1099-B, and the cost basis (Column e) must be accurate. Discrepancies between your Form 8949 and broker statements trigger IRS matching programs.
Incorrect Adjustment Codes
Columns (f) and (g) require specific codes to explain adjustments to gain or loss. Using incorrect codes or forgetting to enter necessary adjustments can result in incorrect tax calculations and IRS notices.
Calculation Errors in Gain/Loss
Column (h) requires calculating gain or loss by subtracting cost basis from proceeds and applying adjustments. Manual calculation errors are common, especially with multiple transactions, leading to incorrect tax liability.
Mixing Short-Term and Long-Term Transactions
Short-term transactions (held ≤1 year) must be reported in Part I, while long-term transactions (held >1 year) go in Part II. Mixing these categories affects your tax rate and creates filing errors.
Missing Form 8949 with Schedule D
Form 8949 must be filed whenever Schedule D reports capital gains or losses. Some filers incorrectly think they can use only Schedule D, which results in incomplete returns that the IRS will reject or request correction.
Not Reporting All Transactions Separately
Each capital asset disposition should be reported on a separate row unless specific exceptions apply. Incorrectly summarizing transactions without qualification leads to IRS inquiries and potential penalties.
Incorrectly Reporting QOF Investments
Qualified Opportunity Fund (QOF) investments require special reporting, including the QOF's EIN, investment date, and deferred gain amount. Errors in QOF reporting can disqualify tax benefits and trigger penalties.
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