Answer:
Company did not pay employees $1,800 they were supposed to at the end of January which means they owe the employees.
As per the Accrual principle of Accounting, expenses are to be recorded when incurred not when paid so the salaries will be recorded as a liability (salaries payable) that will be settled when the amount is paid.
Jan, 31
DR Salaries Expense.........................................................$1,800
CR Salaries Payable .......................................................................$1,800