You will be referring to the current balance when you want to see how much money you still have in your account. The posted balance will refer to the balance that you may have in your account even before the deposits, withdrawals, and all the other pending transactions become available. For example, you have deposited a cheque that will be good in three days.
Your current balance will show the amount of money that you have in your account, including the money that is still pending while your posted balance will not show any indication that there is a pending cheque that will be encashed into your account in a few days.
Posted balance is the amount of balance you see in your bank account and is physically available for use. It is calculated as the outcome of a transaction which was executed in the past.
A posted balance is the real balance posted on the actual balance of the account. Available balance is determined by subtracting the "holds" with today's and future date from the "posted balance." A "hold" is the amount that a bank doesn't allow to be employed by the customer.
It usually occurs from direct deposits, debit card purchases, a notice of returns, check deposits that are not yet cleared and a notice of collection. "Hold" is for a temporary period. Available balance is the amount which is available to be used anytime.