Don't use OsCommerce now, currently only zencart..
However Google rounding policy applies to both carts
i.e.
Quote:
In the United Kingdom, the default rounding rule is PER_LINE and
the default rounding mode is HALF_UP.
The rounding rule ensures that taxes are calculated separately for each item in an order,
and the rounding mode affects the way that each calculated amount is rounded.
For more information about these rounding policies, please see the
Google Checkout Rounding Policy document.
By default, if a U.K. merchant does not specify valid shipping areas for a shipping method,
any U.K. shipping address will be accepted. For example, the Isle of Man is not
in the United Kingdom and, therefore, is not in the default shipping area.
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Hope this helps.
