Såfremt et sådant grundlag ikke foreligger eller er ubetydeligt, fastsættes en foreløbig pro rata–sats skønsmæssigt af den afgiftspligtige person under administrationens kontrol.
In the absence of any such transactions to refer to, or where they were insignificant in amount, the deductible proportion shall be estimated provisionally, under the supervision of the tax authorities, by the taxable person on the basis of his own forecasts.