This method will add a tax rate for a tax that has been setup for the business logged in.
|tax_id||Integer||This is the unique identifier of the tax we are adding a rate to.|
|open_date||Timestamp||This is the start date that this new rate takes affect on.|
|close_date||Timestamp||This is the close date that this new rate ends on.|
|value||Big Decimal||(Optional) This is the value of the new rate we are adding.|
|format||enumeration||(optional) Set this value to "xml" for XML raw formatted output, "xml-clean" for XML tidy formatted output or "json" for JSON formatted output. If not passed, "xml" is used as a default|