Banks Can Hold Crypto — But Their Rulebook Thinks It’s a Money Pit

Banks in the US, UK and Europe have finally been given a legal green light to do things like issue stablecoins, custody Bitcoin, and settle tokenized funds. Great news, right? Not so fast. The capital rulebook these banks must follow treats certain crypto exposures like a guaranteed cliff dive for equity — and that makes a lot of otherwise-available crypto business suddenly unaffordable.

How the capital rulebook turns crypto into deadweight capital

Behind the scenes there’s a global framework that tells national regulators how much capital a bank must set aside against each asset. Its crypto chapter buckets tokenized assets and coins into groups depending on how “bank-like” they look. Tokenized versions of traditional stuff and well-behaved stablecoins sit in friendlier lanes. Anything sketchy, illiquid, or hard to hedge gets shoved into the scary lane.

That scary lane has a shocker attached to it: a huge risk weight. Apply the math and a bank could be forced to hold roughly one dollar of capital for every dollar of Bitcoin on its books. Add supervisory buffers and no netting of long/short positions, and a seemingly small trading book quickly becomes a capital black hole. There’s also a quirky exposure cap: if a bank’s holdings in this lane breach a low threshold, the rules can yank hedging recognition away and slam whole portfolios into the worst treatment at once. That cliff is exactly the kind of thing that makes risk managers blanch.

Those heavy-handed numbers were written during the era of exchange meltdowns, opaque stablecoin reserves and dramatic collapses. Back then the cautious approach made sense: regulators wanted to keep risky crypto losses out of insured deposits. But now tokenized deposits, custody services and on-chain settlement are moving onto regulated balance sheets — and many of those activities are not the same beast as speculative token bets. The problem is the rulebook still lumps them together.

Two roads forward — and why banks care so much

What happens next depends on whether the rules loosen up a bit or stay brutally conservative. If the punitive treatment persists, banks will either avoid balance-sheet-heavy crypto work or charge so much that the business stops making sense. That pushes custody, settlement and issuance toward nonbank players — exactly the opposite of the “bring it into the regulated system” goal.

On the other hand, a more risk-sensitive approach would let banks economically offer tokenized deposits, run stablecoin reserve management, and distribute tokenized government securities without their capital evaporating. In that world, more of the settlement and custody plumbing moves back inside regulated institutions — which is where supervisors prefer it.

Why do banks even care? Because most of what they want is fee-based and light on the balance sheet: custody, fund admin, tokenized deposit plumbing, collateral services, and so on. However, some lines — market-making, inventory financing, and certain tokenized products — do need capital. The capital charge is the cold spreadsheet that decides whether those services clear the bank’s internal return bar. If the charge is enormous, the bank politely declines.

There’s already a sign the framework is creaking: major regulators don’t all agree on how to treat these assets, so national rulebooks can end up giving the same token vastly different capital tags in different markets. That means global banks might have to design different digital-asset products for different jurisdictions — delightful for product teams, disastrous for efficiency.

In short: the legal door is open, but the capital tab still decides who walks through. Until the global rulebook gets rewritten to reflect the spectrum of real risk — from tokenized Treasuries to fully reserved payment tokens to speculative coins — banks will keep leaning in from the edge, testing what they can offer without turning their balance sheets into decorative paperweights.

So keep an eye on the regulators’ review processes. They’re the ones holding the scissors that can snip or stitch together a path for banks to make crypto a normal, boring part of doing business — or leave it more exciting, risky, and decidedly nonbank.