12 CFR §329.10

1. (a)Minimum liquidity coverage ratio requirement. Subject to the transition provisions in subpart F of this part, an FDIC-supervised institution must calculate and maintain a liquidity coverage ratio that is equal to or greater than 1.0 on each business day in accordance with this part. An FDIC-supervised institution must calculate its liquidity coverage ratio as of the same time on each calculation date (the elected calculation time). The FDIC-supervised institution must select this time by written notice to the FDIC prior to December 31, 2019. The FDIC-supervised institution may not thereafter change its elected calculation time without prior written approval from the FDIC.
2. (b)Calculation of the liquidity coverage ratio. A FDIC-supervised institution's liquidity coverage ratio equals:
   1. (1)The FDIC-supervised institution's HQLA amount as of the calculation date, calculated under subpart C of this part; divided by
   2. (2)The FDIC-supervised institution's total net cash outflow amount as of the calculation date, calculated under subpart D of this part.