The Provision account is an expense account. The Reserve account is a balance sheet account. Example- You want to establish a reserve for bad debts of $5,000.
Your entry is
DR Provision for Bad Debts $5,000
CR Reserve for Bad Debts $5,000
The Reserve for Bad Debts is also known as " The Allowance for Bad Debts"
It is a balance Sheet account shown under the Accounts Receivable Account on the Balance Sheet.
It nets the Accounts Receivable Account down to reflect what you really expect to collect out of the total accounts receivables.