Update a worker's state income tax withholding settings for one or more states in a single request. Only state and exempt are required for each entry. Any other field you omit keeps its current value.

The request is all-or-nothing: each state may appear only once, and every state must be one the worker has settings for, as returned by Get state tax withholding settings. If any entry is invalid, none are updated. See the Guide to the Worker Tax Withholdings API for details.