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For rate corrections, source updates, accessibility problems or a broken calculation, contact Ultra Edge Labs, which maintains StateTaxAdd.

Email: [email protected]

Please include the state, an illustrative amount, whether you used typical local or a custom local, and the figure you expected. Do not send private invoices, financial records or identification documents. We cannot give tax advice or tell you what to charge a customer.

For how numbers are compiled, see methodology. For legal limits, see the disclaimer.