In auditing, a column of numbers is “footed” when the auditor has independently re-added it from top to bottom and confirmed the total matches what the client reported. It’s a basic check on mathematical accuracy, and it falls under a broader audit procedure called recalculation. Both the PCAOB, which oversees auditors of public companies, and the AICPA, which sets standards for auditors of private companies, treat recalculation as a substantive procedure for gathering audit evidence.1PCAOB Public Company Accounting Oversight Board. AS 1105: Audit Evidence
The concept is simple, but the work isn’t trivial. Financial statements carry dozens of columns across trial balances, schedules, and ledger summaries. A single addition error in one place can flow into every total that depends on it, so auditors treat footing as a foundational step rather than a formality.
Footing vs. Cross-Footing
Footing runs vertically, down a column. Cross-footing runs horizontally, across a row. To foot means to add up a column and verify its total; to cross-foot means to verify that the totals across a row agree to a grand total. A typical schedule shows column totals along the bottom and row totals along the right side, and auditors check both directions so the data is internally consistent.
When a schedule is both footed and cross-footed, the sum of all column totals should equal the sum of all row totals. Those two numbers meet at the bottom-right corner, sometimes called the check figure. If both directions produce the same grand total, the table balances. If they don’t, a number was entered in the wrong row, the wrong column, or left out entirely. Checking both directions catches errors that a single-direction check would miss.
Picture a schedule of quarterly revenue for three product lines. Footing means the auditor re-adds each quarterly column to verify the column total. Cross-footing means the auditor re-adds each product line’s row to verify the row total. Total annual revenue in the corner should be the same whether you arrive at it by adding the four column totals or the three row totals.
How You’ll See It Marked in the Working Papers
After verifying a total, the auditor places a small symbol next to it in the working papers. These symbols are called tick marks. The most common convention uses “F” to show a column has been footed and “CF” to show a row has been cross-footed.2World Bank. Fundamentals of Financial Statements Audit Each working paper carries a legend explaining its tick marks, so a senior auditor, a peer reviewer, or a regulator picking up the file can see exactly which procedures were performed on each number.
How Auditors Actually Foot Numbers
The mechanics are straightforward: re-sum the client’s figures independently, then compare the result to the reported total. If they agree, the column is marked as verified. If they don’t, the auditor investigates line by line until the discrepancy surfaces. The tool can be a calculator, a spreadsheet formula, or audit software.
Most audits today rely on computer-assisted audit techniques, sometimes called CAATs or generalized audit software, to recalculate totals and test mathematical accuracy across full data sets. Where a manual approach might involve re-adding a sample of columns, automated tools can verify every column and row in a schedule in seconds. For high-volume clients, that has become the standard approach.
What Happens When a Column Doesn’t Foot
A discrepancy doesn’t automatically mean a problem with the financial statements. The auditor first traces the difference to its source. Common causes are data entry mistakes, rounding, software configuration issues, or items posted to the wrong account. Most footing errors turn out to be clerical and get corrected during the audit.
Whether an error matters for the audit opinion turns on materiality, the threshold at which a misstatement would likely influence the judgment of a reasonable investor. Auditors set an overall materiality level at planning as a dollar figure, and a lower “tolerable misstatement” threshold to keep small uncorrected errors from adding up to something material. A $200 footing difference at a company with millions in revenue is typically noted but not material. The same small error can still matter if it involves a sensitive area like related-party transactions or executive compensation, because qualitative factors can make a numerically small misstatement significant.3PCAOB Public Company Accounting Oversight Board. AS 2105: Consideration of Materiality in Planning and Performing an Audit
If the client corrects the errors, the auditor re-verifies the revised figures and moves on. If material misstatements remain uncorrected, the auditor cannot issue a clean opinion and instead issues a qualified or, in more severe cases, an adverse opinion.4PCAOB Public Company Accounting Oversight Board. AS 3105: Departures from Unqualified Opinions and Other Reporting Circumstances All identified errors, material or not, are communicated to management and, where appropriate, to those charged with governance so the company can tighten its processes.