Availability float is the time between when a check is deposited and when the funds are available to the recipient. The cause of the delay is the time required for the issuing bank to honor the check and transfer funds to the receiving bank. The availability float works in favor of the payer, which retains use of its funds during the float period. This float works against the interests of the payee, which will not have use of the funds until the funds are made available to it by the bank.
As an example of availability float, a business currently has a balance in its bank account of $42,000. The entity receives a check for $3,000 from a customer, deposits the check, and records the cash receipt in its own records, resulting in a cash balance of $45,000. The bank's records will still show a $42,000 balance for several more days, until the check clears. This $3,000 difference is the availability float.