You'll want to set up a prepaid asset account for the $2000 credit. Then create a journal entry to categorize the credit into that account. You'll debit the prepaid asset. The credit can either go to an income account like other income or can be used to reduce the same expense account you normally book employer contribution to, which may be a separate expense account or may be included with wages and salaries or other employee benefits.
When you pay employer contributions, you will credit the prepaid asset for the amount used and debit the usual employer contribution expense account.
