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No. You can designate which customers will have Zamp tax calculations and which will persist your own sales tax calculations on transactions posted to Zamp.
The Zamp Tax bundle will not impact performance in a major way. On average, you can expect to see a 2-3% increase in transaction save time. Larger transactions (60+ lines) may see closer to 4%, but small transactions will not experience any noticeable difference.
Under Set Up Taxes, ensure the Per-Line Taxes on Transactions box is checked.
The first day of the following month. Any requests to push transactions to Zamp past the first day of the next month will fail with a 400 .