On dec 31st company determines that bad debts are expected to total $2000. Need journal entry

You have to try to answer first.:)

Dr bad debt
Cr capital

Ok, I hope you should try harder though... In crediting capital, you are adding to it 2000 which does not make any sense.

dr. Bad Debts Expense 2000
Cr. Allowance for Doubtful Accounts 2000

You credit allowance for doubtful accounts since 2,000 is only an estimate of bad debts, meaning it is still uncertain. It becomes a contra-asset to the Accounts Receivable.