Banks don’t survive just by being profitable — they survive by absorbing losses without disrupting credit. That requires capital, but capital also limits how much they can lend or expand. So regulation isn’t just about safety; it’s about how much friction the system can handle before it starts hurting function. The Fed’s recent easing of capital rules reflects that constant trade-off.

Ahead of March 17, 2026, the Federal Reserve proposed a revised approach to large-bank capital rules, dialing back parts of its more aggressive 2023 plan. The changes included softer treatment within elements of the Basel framework, a more flexible leverage ratio, and greater transparency around stress testing.

Supporters argue that capital requirements had become overly restrictive, limiting banks’ ability to extend credit and support market activity. Critics counter that easing those buffers—especially amid geopolitical uncertainty and credit-market stress — could weaken resilience when it is most needed.

Banks sit at the core of the financial system, turning deposits and funding into loans, liquidity, and market intermediation. That only works if creditors trust the bank can absorb losses — capital is what underwrites that trust.

But higher capital brings a trade-off. With more held in reserve, banks can do less with the same balance sheet. Returns on equity come under pressure, some activities become less viable, lending can tighten, and market-making may shrink. Stronger protection can mean lower throughput.

Capital rules determine where risk sits. Tighter requirements push more of the burden onto shareholders upfront, through lower leverage and efficiency. Looser rules defer that burden, leaving more of it to creditors, depositors, or the broader system if stress hits.

That’s why capital policy is really about risk transfer. More capital trades efficiency for resilience; less supports credit in the short term but increases reliance on stability lasting.

Liquidity still depends on bank balance sheets, even in a system shaped by non-banks. Banks support financing, credit, and core infrastructure.

But tighter capital requirements shift the burden onto shareholders through lower returns and reduced balance-sheet efficiency. Reinvention — whether through regulatory changes or balance-sheet expansion — would ease those constraints, but at the cost of taking on more risk.

That’s the core tension: protecting the system limits returns, while improving flexibility requires accepting more fragility.

What persists: the basic need for banks to intermediate capital and liquidity. That role has not disappeared, even with the rise of non-bank finance.

What can break: the assumption that regulation can fully solve the trade-off between resilience and credit provision. It cannot. It can only move the constraint. If the buffer is too small, the system is vulnerable. If the buffer is too large, the system becomes less responsive. The tension is structural, not temporary.

The real issue in bank capital is not whether safety is good or lending is good. Both are necessary. The issue is that they draw on the same balance sheet. That is why banking systems remain permanently constrained.