Municipal bonds will be excluded from the group of easily sellable assets that banks can use to show they’re able to survive a credit crunch, according to a person familiar with the rule.

Regulators including the Federal Reserve are set to approve a final liquidity rule on Sept. 3. The most recent draft bars debt issued by states and municipalities from being listed as high-quality assets that could help sustain a bank through a 30-day squeeze, said the person, speaking on condition of anonymity because the process isn’t public.