WASHINGTON (Reuters) - The Federal Reserve on Monday finalized a rule requiring big banks to disclose certain liquidity measures for the first time, as part of an effort to make sure they can cover large or rapid withdrawals.

Notably, banks will have to post each quarter the ratio comparing their assets that can quickly be converted to cash to their expected cash outflows during a time of financial stress. They will also have to disclose the consolidated amounts of their high-quality liquid assets and their projected net cash outflow amounts over a 30-day stress period.

Deadlines for banks to comply with the new requirement range from April 2017 through Oct. 18, the Fed said.

(Reporting by Lisa Lambert; Editing by Meredith Mazzilli)