The legal products of a tax audit consist mainly of Tax Assessment Letters (Surat Ketetapan Pajak/SKP) as mentioned above and Tax Collection Letters (Surat Tagihan Pajak/STP ), which must be based on the closing conference document. A STP typically serves as a legal instrument to collect administrative tax sanctions not covered in a SKP. In some other situations, it may also be used by the DGT to collect tax due in a particular tax period (month) within the current year and the interest penalty on this.