Basel Committee Finalizes Crypto Reserve Rules as Banks Clear Path for Spot Holdings

A closed-door session ended with open doors for balance sheets. On July 10, 2026, the Basel Committee published its final standard on bank exposures to digital assets, setting a 2% Tier 1 capital cap for Group 2 crypto like BTC and ETH, while tokenized deposits and stablecoins meeting reserve rules fall into Group 1a with zero risk weight. The framework takes effect January 2027, but custody pilots can start now.

The nuance is in the buckets. Group 1a covers tokenized cash and Treasuries with daily redemption, putting them on par with reserves. Group 1b includes regulated stablecoins with proven peg stability, capped at 1.5% of liabilities. Group 2 is everything else, from BTC to altcoins, with a strict cap and 1250% risk weight. That means a bank with $100 billion Tier 1 can hold $2 billion in BTC at most, but unlimited tokenized T-bills.

Flow signals arrived fast. Two global custodians confirmed they will launch insured BTC custody for private banks in Q4, citing the clarity. Futures basis on regulated venues tightened 40 bps as desks modeled lower funding costs once banks can hold spot against ETFs. Meanwhile, tokenized bill supply grew $610 million this week, with 78% minted by entities tied to banks testing Group 1a rails.

Risk is not gone. The cap is low, and regulators can still block specific assets. But the rule removes career risk for treasurers. A CIO can now tell a board that BTC has a Basel line item, just like gold. That changes allocator math. Expect family offices to ask banks for spot access instead of futures, and expect spreads to compress as inventory sits closer to end clients.
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