A Form 10-K is an annual report; a Form 10-Q is an interim report. Both can contain financial statements, management discussion, controls, and risk information, but they do not cover the same time span or carry the same level of audit assurance. The safest comparison begins with each column heading, not the form's nickname.
The 10-K closes a fiscal year; the 10-Q updates it
The annual 10-K gives the fuller account of a completed fiscal year. Its financial statements are audited and accompanied by notes and an auditor's report. The quarterly 10-Q updates the market during the fiscal year with more abbreviated disclosure and unaudited interim financial statements. For registrants using these forms, the current official Form 10-Q instructions specify reports after the first three fiscal quarters and no separate Form 10-Q for the fourth quarter.
“Unaudited” does not mean that no independent accountant is involved. SEC staff guidance states that the interim financial statements in a 10-Q must be reviewed by an independent registered public accountant before filing. A review uses narrower procedures and provides a different level of assurance than an annual audit; it should not be described as equivalent to one. Investor.gov's EDGAR research guide summarizes the 10-K as containing audited annual statements and the 10-Q as containing unaudited quarterly statements.
10-K and 10-Q compared
| Question | Form 10-K | Form 10-Q |
|---|---|---|
| Main period | Completed fiscal year | Current fiscal quarter and/or fiscal year to date, depending on the statement |
| Financial statements | Annual statements with an independent auditor's opinion | Condensed interim statements labeled unaudited; independent accountant review is required before filing |
| Disclosure depth | Fuller annual business, risk, MD&A, notes, controls, and exhibits | More abbreviated update focused on the interim period and material changes |
| Fourth quarter | The completed year includes Q4 | No separate fourth-quarter 10-Q under the current form instructions |
| Best comparison | Fiscal year against a comparable fiscal year | Three months against three months, or YTD against the same YTD span |
Read every period label before using a number
An income statement in a 10-Q may show both the latest three months and the cumulative six or nine months, with comparable prior-year columns. A cash-flow statement is commonly cumulative from the fiscal-year start, so a third-quarter 10-Q may show nine months rather than a standalone third quarter. A balance sheet is different again: it reports financial position as of a date, often the interim period end alongside the prior fiscal year end.
That means “revenue for the quarter,” “cash from operations for nine months,” and “cash at quarter end” answer three different questions. Copy the full heading with the value, including “three months ended,” “nine months ended,” or “as of.” The SEC's public-company overview describes 10-Q information as covering the previous three months and the year to date. The exact columns in the filing remain the controlling source.
A fictional nine-month-minus-six-month example
Suppose a fictional company reports revenue of $600 million for the six months ended June 30 and $960 million for the nine months ended September 30. If both figures use the same accounting basis and fiscal year, the third-quarter increment is $360 million:
Hypothetical Q3 revenue: $960 million nine-month YTD − $600 million six-month YTD = $360 million.
Do not label the $960 million YTD total as third-quarter revenue. Apply the same logic to a cumulative cash-flow value only after checking both filings. For example, $155 million of nine-month operating cash flow minus $90 million of six-month operating cash flow implies $65 million for the third-quarter interval.
Subtraction is a derived estimate, not a newly reported column. Reopen both filings to check for a restatement, discontinued operation, accounting-policy change, acquisition presentation, currency change, or reclassification. If the later filing revises the earlier six-month comparative, use the revised figure and record the version.
The fourth quarter sits inside the full year
Because the current Form 10-Q instructions do not call for a separate fourth-quarter 10-Q, the next scheduled annual filing is the 10-K. You can sometimes derive a rough Q4 income-statement or cash-flow amount by subtracting the comparable nine-month YTD figure from the annual figure. Label that result as derived. It may reflect year-end audit adjustments, reclassifications, or other changes that make it differ from a previously announced quarterly figure.
The annual total is not a fourth-quarter number. It covers the whole fiscal year and brings fuller notes, annual MD&A, and the audit report. Use the 10-K to understand the completed year, then derive Q4 only when the definitions and presentation basis align.
Check the basis before comparing filings
- Fiscal calendar: a fiscal quarter or year may not end with a calendar quarter or December, and a 52- or 53-week year can change the day count.
- Currency and scale: confirm the reporting currency and whether tables use dollars, thousands, or millions.
- Definitions and scope: keep GAAP measures separate from company-defined non-GAAP measures, and check segment or continuing-operations changes.
- Versions: look for 10-K/A or 10-Q/A amendments and for restated or recast prior periods in the latest filing.
- Form family: a foreign private issuer may use Form 20-F for its annual report and Form 6-K for other information instead of following the domestic 10-K/10-Q pattern.
These checks explain why matching a ticker and line-item label is insufficient. A defensible comparison also matches entity, period length, statement type, accounting basis, currency, scale, and filing version.
Use StockDCA's annual charts with the filing timeline
StockDCA's financial charts display supported annual USD facts sourced from 10-K disclosures. The recent filing list may link to a newer 10-Q, but that does not convert the annual chart into a quarterly series. Open the 10-Q for interim results, read its period headings, and keep any quarter or YTD calculation in your own notes. Missing or unsupported fields remain unavailable.
The workspace guide explains how source links, prepared reading questions, and browser-saved notes work. To practice with a public illustration, open AAPL in Research; the ticker is an example, not a stock recommendation.