Which of the following uses of Web Pay is not allowed for California taxpayers?

The use of Web Pay by California taxpayers has specific limitations, particularly regarding the types of transactions that can be conducted through this online platform. The ability to make payments for personal income taxes, business income taxes, and estimated tax payments aligns with the functionalities offered by Web Pay. This platform is designed to facilitate these kinds of transactions efficiently.

However, requesting an installment agreement is a process that involves negotiations and agreements between the taxpayer and the California Department of Tax and Fee Administration (CDTFA). This cannot be effectively managed through a payment service like Web Pay, which is geared specifically toward processing payments rather than facilitating discussions or arrangements related to installment agreements. Thus, while taxpayers can pay their owed taxes online, the initiation or request for setting up payment plans must be done through other official means, making it an activity not permissible via Web Pay.

Understanding these limitations is crucial for taxpayers in California to ensure they are using the correct channels for their tax-related needs.