I'd be glad to provide you the steps to disable the option for tax code when uploading your bank transactions. You can choose the No VAT option on your Account and Settings section.
Here's how:
Click the Gear icon at the upper right corner and choose Account and Settings.
Go to the Advanced tab and click the Accounting area.
Feel free to drop me a reply below if you need more help with importing or anything tax code related to QuickBooks Online. I'll be around to lend you a hand.
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