In Xero (and accounting software in general) it is often necessary to make use of a 'rounding' account to record any variances that occur as a result of the rounding process.
This is especially important when linking two pieces of software, where the rounding methods used in the two may differ slightly (as they do in Xero, MYOB, and printIQ for example).
printIQ attempts to take care of rounding variations for you during export by creating a 'rounding adjustment' line in the invoice when Xero and printIQ disagree on the total by less than 5 cents. To make this work, it is important to let printIQ know what your rounding account code is in Xero.
By default, the Xero Rounding Code is 860, however this is sometimes not the case, and it should be checked. To find your Xero Rounding Code:
Rounding in the search field above the accounts list, and press Search