The Glass-Steagall Act is one of the most debated pieces of financial legislation in American history — both when it was passed in 1933 and when it was repealed in 1999. Understanding it helps explain how the modern financial system was built, how the 2008 financial crisis happened, and why banking regulation remains politically contentious today.
What the Glass-Steagall Act Did
The Banking Act of 1933 included four provisions known collectively as “Glass-Steagall” (named for Senator Carter Glass and Representative Henry Steagall):
- Separated commercial and investment banking — banks that took deposits could not underwrite or deal in corporate securities; investment banks could not accept deposits
- Created the FDIC — established federal deposit insurance for the first time
- Regulated interest rates on deposits — Regulation Q prohibited interest payments on demand deposits and capped savings account rates (phased out later)
- Required Federal Reserve supervision of bank holding companies
The core provision that made headlines was the wall between commercial and investment banking.
Why It Was Passed: The Great Depression Context
From 1929 to 1933, nearly 10,000 US banks failed. Congressional investigations found that banks had underwritten securities and sold them to depositors at inflated prices, made loans to issuers of securities they were underwriting, and used depositors’ money to speculate in the stock market.
Senator Glass and Representative Steagall believed these conflicts of interest were a primary cause of the banking collapse. Their solution: complete structural separation.
The Gramm-Leach-Bliley Act: The 1999 Repeal
By the 1990s, the separation had already eroded through regulatory interpretation. The Federal Reserve had allowed bank holding companies to derive up to 25% of revenue from securities activities. Citicorp had already merged with Travelers Group (an insurance and investment bank conglomerate) before the law changed — effectively forcing Congress to act to legalize what had already happened.
The Gramm-Leach-Bliley Act of 1999 formally repealed the key provisions, allowing:
- Commercial banks to underwrite securities
- Investment banks to offer banking products
- Financial holding companies to combine banking, securities, and insurance under one roof
Major beneficiaries: Citigroup, JPMorgan Chase, Bank of America/Merrill Lynch, and others.
The 2008 Financial Crisis and the Debate Over Repeal
| Argument | Details |
|---|---|
| Repeal contributed | Banks accumulated mortgage-backed securities on balance sheets; conglomerate failures were systemic |
| Repeal was not primary cause | Lehman, Bear Stearns were standalone investment banks; leverage and regulation failures were larger factors |
| Dodd-Frank partially restored limits | Volcker Rule bans proprietary trading at commercial banks |
The Volcker Rule (Section 619 of Dodd-Frank, 2010) is the closest modern equivalent: it prohibits federally insured banks from engaging in short-term proprietary trading for their own accounts. It does not, however, restore the full Glass-Steagall separation.
What Remains Today
As of 2026, the US financial system operates without a Glass-Steagall-style separation. Large financial conglomerates — JPMorgan, Bank of America, Citigroup, Wells Fargo — combine commercial banking, investment banking, asset management, and consumer finance.
Ongoing regulations provide guardrails:
- Volcker Rule — no proprietary trading at commercial banks
- Basel III capital requirements — higher capital buffers for systemically important banks
- Enhanced prudential standards (Dodd-Frank) — stress tests, living wills, liquidity requirements for banks over $100B
For more on how banks are regulated, see what is a bank holding company and what banks do with your deposits.
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