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My apology, I was referring to invoicing where this is also an issue. The manual adjustment of bills may be a handy workaround however the same logic applies - can Xero not simply code the software to not round off each line item, opting rather to display only the first 2 decimal places without removing or rounding any of the lower decimal places? In that way when the total of all the lines is calculated it is factoring in the exact GST for each line item, summing to a total. The total can then be rounded once, in line with IRD's methodology and conventional wisdom.

I agree with many of the comments below: This should not require manual adjusting by users. The software should be coded to provide the accurate calculation of the total GST, the total being rounded only once at the end. Each line item should not be rounded, rather only displaying the 2 decimal places with the rest not displayed but not rounded off. Very embarrassing to have customers reaching out about an "error" in our invoiced GST amount every time.

Agree with all the comments. The ability to adjust GST would be very helpful!

So Xero well done
Lets just round out GST calculations on each line so if multiple lines are used it will mess up the end result, bravo

You need to make sure calculations are not rounded so this does not happen

Not very professional on Xero'"s behalf to ask the customer to "adjust" what is a simple calculation that should be coded correctly in the beginning.

and to know about it yet do nothing to fix it

Yes, very unprofessional to have a customer tells us our invoice is wrong and then not be able to correct the invoice properly. They will not accept any rounding!
It's a basic that should not be an issue.

There should be an option to calculate GST either by line or subtotal.

Issuing an invoice with the incorrect value of GST on it - it's not a very professional look for us or for Xero.

Having customers tell us our GST calculation is wrong is a bit embarassing. it can be tidied up with a couple of adustment lines (one with no GST) but this looks terrible.

This is crucial. If I have more than 10 lines in my invoice I am greater than 10c out in the gst calculation due to rounding which is larger than the suggested rounding reconciliation value?? Looks very unprofessional

Yes please. It's very annoying.

Yes, please. Rounding errors caused by GST calculations are the bane of my billing