Most Service Centers are now open to the public for walk-in traffic on a limited schedule. Appointments are recommended and walk-ins are first come, first serve.
Walk-ins and appointment information
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2018 CD-429B Underpayment of Estimated Tax by C-Corporations
Corporations use Form CD-429B to determine whether the corporation owes interest on the underpayment of estimated tax and if so, the amount of interest.