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Avalara Help Center

Add a Safe Harbor Override to AFC Viewer

Add a Safe Harbor Override to the Customer Portal AFC Viewer by including a Fed TAM Override on the transaction.


  1. In Customer Portal, go to Tax Determination > AFC Viewer.
  2. Click + Fed TAM Overrides and then click Add Fed TAM Override.
  3. Set the Traffic Study Type.
  4. Enter the new rate in the Federal TAM Override (%) field in decimal format.
    For example: Use 0.35 for 35%.
  5. Click Save to apply the override. 
    Add additional overrides for the remaining Traffic Study Types or click Close to exit the Federal TAM Override form.