Abstract: A system for calculating and collecting taxes across different tax jurisdictions. The system receives payment information from an online retailer and uses the information to determine if a sales or use tax is owed. If a tax is owed, the system calculates the amount owed and the proper taxing authority to which the tax must be remitted. Upon determining the appropriate tax to be levied, the system provides a tax invoice to an online purchaser and directs the associated tax payment to the appropriate taxing authority.