Overview
IRS Publication 550, Investment Income and Expenses (Including Capital Gains and Losses), is the Internal Revenue Service’s guidance for taxpayers on how to treat investment income and investment-related expenses on their federal income tax returns. It explains what kinds of investment income are taxable, how to calculate gains and losses when you sell investment property, which investment-related expenses are deductible, and where to report these items on your return.
Who should read Publication 550
– Individual investors who receive interest, dividends, or capital gain distributions.
– Owners of mutual fund shares or other regulated investment companies (RICs) and REIT investors.
– Taxpayers who bought or sold investment property during the year.
– Anyone who pays or receives interest on loans, original issue discount (OID), or deals with below‑market loans.
– Investors dealing with foreign investments or foreign sellers of U.S. property (works together with Publication 515).
– Taxpayers who need to determine deductible investment interest (works with Form 4952).
Key topics covered (high level)
– Interest income: bank interest, money market funds, CDs, penalties for early withdrawal, U.S. obligations, foreign interest, OID, interest on tax refunds, U.S. Savings Bonds rules, and special cases (below‑market loans, frozen deposits). (Pub. 550)
– Dividends: ordinary vs. qualified dividends, capital gains distributions by mutual funds and REITs, and how the special lower rates for qualified dividends are applied. (Pub. 550)
– Capital gains and losses: determining gain or loss on disposition of investment property, character (short‑ vs. long‑term), netting rules, and reporting (Form 8949 and Schedule D). (Pub. 550)
– Investment expenses: treatment of investment interest expense (deductible to the extent of net investment income; see Form 4952) and background on other investment expenses (note: many miscellaneous itemized deductions were suspended under tax reform—see current tax law). (Pub. 550; Form 4952)
– Mutual funds and RICs: how distributions are characterized (ordinary dividends, qualified dividends, capital gains distributions) and how to report them. (Pub. 550)
– Withholding and cross‑border issues: withholding obligations when you buy certain U.S. property from foreign persons, and reporting foreign investment income (see Pub. 515 for withholding on nonresident aliens and Pub. 525 for certain employee stock‑option rules). (Pubs. 515, 525)
Practical steps — using Publication 550 to prepare your return
1. Gather documentation
• Collect 1099s and account statements: 1099‑INT (interest), 1099‑DIV (dividends and capital gain distributions), 1099‑B (brokerage sales), year‑end mutual fund statements, and any Forms 1099‑OID.
• For foreign investments, gather applicable statements and any foreign tax paid records (Form 1099‑INT/1099‑DIV equivalents or broker statements).
• Have purchase and sale records (trade confirmations) to determine cost basis and holding periods.
2. Classify each item of investment income
• Use Publication 550’s descriptions to determine whether interest is taxable, whether a dividend is ordinary or qualified, and whether a distribution from a fund is a capital gain distribution. Qualified dividends and net long‑term capital gains get preferential rates. (Pub. 550)
3. Compute interest and special interest items
• Follow Pub. 550 rules for OID, accrued interest, penalties for early withdrawal of CDs, interest on frozen deposits, and below‑market loans to determine taxable amounts and timing. (Pub. 550)
4. Determine capital gain/loss for each sale
• Compute gain or loss = amount realized − adjusted basis. Establish holding period (short‑term vs long‑term). Use broker 1099‑B data and your cost basis records. Reconcile any differences between broker basis reporting and your records. (Pub. 550)
5. Report sales correctly
• Report each sale on Form 8949 (if required) and summarize totals on Schedule D (Form 1040). Use Publication 550 to confirm character and timing for proper reporting. (Pub. 550)
6. Figure investment interest deduction (if applicable)
• Investment interest expense is generally deductible only to the extent of net investment income. Complete Form 4952 to figure the allowable deduction and carryforward rules. Publication 550 explains what counts as net investment income. (Form 4952; Pub. 550)
7. Consider foreign and withholding rules
• If you acquired U.S. real property from a foreign person, review withholding obligations (noted in Pub. 550 and explained in detail in Pub. 515). U.S. citizens must report income from foreign investments even if no Form 1099 was issued. (Pubs. 515, 550)
8. Recordkeeping and supporting documentation
• Keep brokerage statements, trade confirmations, records of reinvested dividends, copies of Forms 1099, and documents that establish basis and holding periods. Pub. 550 emphasizes documentation for accurate reporting and audit support.
9. Use the “where to report” table in Pub. 550
• Publication 550 includes a table that shows where different kinds of investment income and expenses are reported on tax returns. Use it as a quick reference when filling out Form 1040, Form 8949, Schedule D, and Form 4952. (Pub. 550)
10. When to get professional help
• Seek a tax professional if you have complex issues: large portfolio trades, wash sales, partnership or trust investment income, foreign investments with tax treaties, FIRPTA transactions, or if you’re unsure about basis or characterization.
Common examples explained briefly
– Qualified dividends vs ordinary dividends: A dividend is “qualified” if it meets holding‑period and other requirements; qualified dividends are taxed at preferential capital‑gain rates. Use Pub. 550 guidance and your 1099‑DIV box amounts to classify.
– Mutual fund distributions: A distribution from a fund can be ordinary dividend, qualified dividend, or capital gain distribution—often broken out on the fund statement and Form 1099‑DIV. Report each part as instructed. (Pub. 550)
– Original Issue Discount (OID): OID is generally taxable as it accrues; brokers usually report OID on Form 1099‑OID. Pub. 550 describes the rules for accrual and reporting.
– Investment interest vs. investment expenses: Investment interest is the interest paid on money borrowed to purchase taxable investments and may be deductible up to net investment income; many other investment expenses that used to be miscellaneous itemized deductions are suspended under current law—check current IRS guidance.
Where Publication 550 fits with other IRS guidance
– Publication 515: Withholding of Tax on Nonresident Aliens and Foreign Entities — withholding obligations for some purchases from foreign sellers.
– Publication 525: Taxable and Nontaxable Income — addresses employer stock option rules and other forms of income.
– Form 8949 and Schedule D instructions — reporting sales of capital assets.
– Form 4952 — computing deductible investment interest.
(See references below for links to these resources.)
Records to keep (recommended)
– Forms 1099 and 1099‑B, year‑end brokerage statements and mutual fund statements.
– Trade confirmations, purchase and sale receipts, reinvestment records for dividends and capital gains.
– Records of interest income and statements for OID or below‑market loans.
– Documentation of foreign taxes paid and any withholding documentation.
Where to find Publication 550 and related forms
– Publication 550 is available on the IRS website and contains the full guidance, examples, and the “where to report” table. (See links below.)
References and further reading
– IRS, Publication 550, Investment Income and Expenses (Including Capital Gains and Losses). Available: (accessed Oct. 7, 2025).
– IRS, Publication 515, Withholding of Tax on Nonresident Aliens and Foreign Entities. Available: (accessed Oct. 7, 2025).
– IRS, Publication 525, Taxable and Nontaxable Income. Available: (accessed Oct. 7, 2025).
– IRS, About Form 4952, Investment Interest Expense Deduction. Available: (accessed Oct. 7, 2025).
– IRS, Form 8949 and Schedule D instructions (reporting capital gains and losses). Available via (search Form 8949 / Schedule D) (accessed Oct. 7, 2025).
– Walk through a sample return showing how a specific set of 1099s and trades get reported (step‑by‑step).
– Summarize the Publication 550 rules that most affect active traders vs. buy‑and‑hold investors.
– Identify which items in your broker statements you should flag for Form 8949/Schedule D or Form 4952.