That depends. If you have been with your most recent employer for the past 18 months or more, it is not necessary to report any previous employment. If your first day worked with your most recent employer was in the past 18 months, it is best to include the names and account numbers of your previous employers. The account numbers can be found on your pay stub or W-2. Providing this information will ensure that the state uses all your earnings to determine your weekly benefit amount. The more you earned, the higher your weekly benefit amount can be.