Hi,

The precision is usually based on the currency settings. Which for GBP is always 2, so there's no real reason to change that.

And again, i'm still confused about your reasons for putting the multiplier in.

If all of your products are set as 'taxable' but no tax rates are set, then you won't charge VAT at output.

If later on, you become vat registered, then you only need to set the tax rate, not change all your product prices.