Get Tax Amount On Purchase Order

static void CalculatePurchaseTax(Args _args)
{
    PurchTable     _purchTable = PurchTable::find("000014");
    PurchTotals    purchTotals;

    purchTotals   = PurchTotals::newPurchTable(_purchTable);
    purchTotals.calc();
    purchTotals.tax().sourceSingleLine(true, false);
 
    info(strFmt("Tax : %1", purchTotals.taxTotal()));
}