Notes
What I learned building a reconciler over every SEC filing — the parts that surprised me, written down while they were still surprising.
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Why SEC XBRL Data Is Wrong 1 Out of 5 Times (And How to Fix It)
JPMorgan reports Total Assets 23 different ways in a single filing. Most SEC filings APIs pick one at random and are wrong roughly one filing in five. Here is why, and how the accounting identity fixes it.
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Why Bank Balance Sheets Are Different
A bank's balance sheet inverts the shape you expect: deposits are liabilities, loans are assets, and equity is a sliver. What that means when you read JPM, BAC or WFC at true proportion.
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Understanding the Accounting Identity
Assets = Liabilities + Equity is not a rule filers follow. It is a consequence of double-entry bookkeeping, which is what makes it usable as a test on data you did not produce.