“Capital doesn’t just absorb risk, it shapes where risk goes, and getting the calibration right determines whether activity stays inside the regulated system or moves outside it.”
That powerful line from Federal Reserve Vice Chair for Supervision Michelle W. Bowman’s March 12, 2026 speech (“Capital Rules for the Real Economy”) perfectly frames the sweeping capital proposals the banking agencies released just one week later on March 19.
These three coordinated proposals — the revised Basel III “endgame,” an updated standardized approach for most banks, and G-SIB surcharge revisions — represent a significant pivot from the punitive 2023 version. The goal: better risk sensitivity, fewer overlaps with stress testing, and incentives to keep traditional lending (mortgages, consumer, and business credit) inside the regulated banking system rather than pushing it to nonbanks.
Here’s the full picture from the conversation many of us have been having — with special focus on what it means (or doesn’t mean) for small banks and credit unions by asset size.
1. Yes — This Is the Basel III Endgame (Just the Calmer U.S. Version)
The package finally implements the 2017 Basel III agreement with heavy U.S. tailoring:
- Single risk-based calculation for the largest banks (no more dual approaches).
- More granular risk weights (LTV for mortgages, repayment history for retail, credit quality for corporates).
- Mortgage servicing assets (MSAs) move from full deduction to a 250% risk weight.
- AOCI inclusion for banks ≥ $100B (with a 5-year phase-in).
- Modest G-SIB surcharge reductions.
Net result: modest relief overall, not the capital hikes everyone feared in 2023.
2. CECL and Loss Reserves: Zero Direct Change
These are regulatory capital rules, not accounting rules.
- CECL internal models and lifetime expected loss estimation remain fully required for GAAP reporting.
- No relief from CECL provisioning.
- Allowances for credit losses on loans and leases are unaffected directly.
Any indirect benefit (slightly lower reserves over time) would come only if banks can originate and hold more high-quality loans because capital costs are now better aligned — but that’s a second-order effect at best.
3. Which Capital Ratios See the Biggest Impact?
Primarily the risk-based ratios, especially CET1. Leverage ratios (SLR/eSLR) see smaller indirect effects. The agencies’ own estimates (including stress-test interactions) show:
4. Impact by Bank Asset Size — The Real Story for Small Banks & Credit Unions
Here’s the breakdown everyone is asking about:
Largest Banks (Category I & II — typically >$700B or G-SIBs)
→ CET1 requirements ↓ 4.8% net
(Basel proposal alone +1.4%, offset by G-SIB surcharge cut of 3.8%)
Large Regionals (Category III & IV — generally $100B–$700B)
→ CET1 requirements ↓ 5.2%
(Plus mandatory AOCI inclusion with phase-in)
Smaller Banking Organizations (< $100B assets, non-CBLR)
→ CET1 requirements ↓ 7.8% (the largest percentage relief)
The standardized approach proposal directly updates risk weights for traditional lending — exactly the business model most small banks run. Opt-in to the expanded risk-based approach is also available, with some analyses suggesting up to one-third of these banks could see even bigger reductions.
Community Banks (Qualifying CBLR banks — typically < $10B assets)
→ No direct impact from these proposals.
CBLR-eligible institutions stay on the simple leverage ratio framework. Separate November 2025 CBLR enhancements (still pending) are the only relief path here. These proposals explicitly do not target or change the community bank leverage ratio.
Credit Unions (All asset sizes — regulated by NCUA)
→ Zero direct impact.
These rules come from the federal banking agencies (Fed/FDIC/OCC) and do not apply to credit unions. America’s Credit Unions has already called on the NCUA to modernize its own risk-based capital framework and align treatment of mortgage servicing assets for parity. Until NCUA acts, credit unions operate under a completely separate rulebook.
Bottom Line for Balance Sheet Strategy & Credit Markets
- Small banks (<$100B non-CBLR) get the most proportional breathing room — potentially freeing capital for more lending without migrating risk outside the system.
- True community banks on CBLR and all credit unions are largely untouched — a reminder that size thresholds still matter enormously in U.S. regulation.
- The overall philosophy (per Bowman) is working: better calibration keeps productive risk inside regulated balance sheets.
Comments on the proposals are due June 18, 2026. This is one of the biggest capital recalibrations in years — and the final rules could still shift.
What are you seeing on your balance sheet or in credit markets? Will this change how your institution thinks about lending, MSAs, or capital deployment? Especially interested in perspectives from community banks and credit unions — drop a comment below.
Links for reference:
- Bowman Speech: https://www.federalreserve.gov/newsevents/speech/bowman20260312a.htm
- Joint Agency Press Release & Proposals: https://www.federalreserve.gov/newsevents/pressreleases/bcreg20260319a.htm
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