Reading a Brokerage Statement
A statement reconciles a period. The sections that get skipped are the ones that reveal costs, corporate actions and errors.
MadStockAlerts Research · Updated August 29, 2026
What to take away
- The value at the top is the least informative number on the document.
- The activity section is where fees, interest and corporate actions appear.
- Cost basis on a statement is a broker's calculation and can be wrong.
- Realised and unrealised gains are different sections and are frequently confused.
- Errors are correctable and the window for raising them is limited.
MAD Academy Training Video · 0:46
Where the Costs Are Actually Written
A statement records what happened, and the sections most people skip are where fees, lending and cost basis are disclosed.
This lesson is part of a Stock Alerts + Tools plan.
The sections, in order of usefulness
| Section | What it answers | Usually read? |
|---|---|---|
| Account value summary | What it is worth now | Always |
| Holdings | What is held, and at what basis | Usually |
| Activity | Every transaction, fee, dividend and adjustment | Rarely |
| Income summary | Dividends and interest, by type | Rarely, and it matters at tax time |
| Realised gains | Closed positions and their results | Rarely |
| Margin and interest detail | What was borrowed and what it cost | Almost never |
The bottom three rows carry nearly all of the information that is not visible on a platform screen. Interest charged, fees deducted and the tax character of income appear here and typically nowhere else.
- Account valueThe least informative number on the document
- HoldingsPositions and the broker's calculation of basis
- ActivityEvery transaction, fee, dividend and corporate action
- Income summaryDividends and interest, by type. This is what tax season needs
- Margin and interest detailWhat was borrowed and what it cost
Cost basis is a calculation, not a fact
Brokers report cost basis to the account holder and, for covered securities, to the tax authority. The figure is calculated by the broker and depends on the accounting method selected on the account.
- The default method is usually first-in first-out, which is a choice with consequences and is rarely made deliberately.
- Basis transferred from another firm can arrive incomplete or wrong, and it remains the account holder's responsibility.
- Corporate actions adjust basis, and complex ones are adjusted incorrectly often enough to be worth checking.
- Wash sale adjustments change basis and are applied by the broker within one account only.
The last point matters more than it appears. A broker applies wash sale rules across the accounts it can see, and a substantially identical security bought in a different account elsewhere is invisible to it while still being covered by the rule.
Realised against unrealised
Unrealised gains are the difference between current value and basis on positions still held. Realised gains are the result of positions closed during the period. Only the second produces a tax consequence, and only the first moves with the market.
The distinction is the reason an account can be down for the year and still generate a taxable gain: the positions that were closed were profitable, and the ones still held are not. The statement shows both, in separate sections, and they are frequently read as one number.
This describes how the reporting works and is not tax advice. The treatment of any particular gain depends on the account type, the holding period and circumstances a professional would need to assess.
Checking it, and the window for errors
- 1Reconcile the activityEvery transaction should be one you recognise. An unfamiliar entry is worth resolving immediately rather than at year end.
- 2Check corporate actionsSplits, spin-offs and mergers are processed by the broker, and complex ones are the most common source of a wrong position or basis.
- 3Check the feesInterest, transfer fees and any advisory fee, against what was agreed.
- 4Raise anything wrong promptlyAccount agreements typically require errors to be reported within a stated period, after which the statement is deemed accepted.
The fourth step is the reason the others are worth doing on receipt rather than annually. The period for disputing an entry is short and it runs from the statement date, not from when the error is noticed.
The year-end documents, and how they differ
Statements arrive monthly or quarterly; tax documents arrive once and are a different construction. Knowing what each covers avoids reconciling two things that were never meant to match.
| Document | Reports |
|---|---|
| 1099-B | Proceeds from sales, with cost basis for covered securities |
| 1099-DIV | Dividends, split between ordinary, qualified and capital gain distributions |
| 1099-INT | Interest, including from Treasuries where held directly |
| 1099-MISC | Substitute payments from lent securities, among other items |
| Consolidated 1099 | The above combined into one document, which most brokers issue |
| Form 5498 | Retirement account contributions, issued later in the year |
Corrected versions are common, particularly where funds reclassify distributions after the fact. A corrected form issued after a return has been filed is a routine occurrence in accounts holding funds.
This describes the documents rather than how to use them, and nothing here is tax advice. The reconciliation between a statement and a tax form is exactly the kind of detail a professional handles routinely.