Which feature in QuickBooks Online allows users to automate regular income entries?

The feature that allows users to automate regular income entries in QuickBooks Online is Recurring Transactions. This functionality is specifically designed to streamline the process of entering transactions that occur on a regular basis, such as monthly rental income or recurring service fees. By setting up a recurring transaction, users can specify the details of the income entry, including the amount, frequency, and any other relevant information. Once established, QuickBooks will automatically generate these income entries according to the defined schedule, which saves time and reduces the risk of human error when entering routine data.

Other options, while useful in their own ways, do not directly relate to the automation of income entries. Income Tracker is primarily a tool for monitoring income received, rather than automating its entry. Transaction History provides a record of all transactions but does not facilitate the creation of new entries. Vendor Management focuses on managing relationships and transactions with vendors rather than automating income-related entries. Thus, the unique capability of Recurring Transactions to streamline the income entry process makes it the correct choice for this question.