Law 906 of 2004 provides for two families of measures over assets. The first seeks to secure forfeiture: article 83 establishes seizure and occupation as material measures and, as a legal measure, suspension of the power of disposal, which apply when there are well-founded grounds to infer that the assets or resources are the direct or indirect product of an intentional crime, that their value is equivalent to that product, that they were used or intended to be used as a means or instrument of an intentional crime, or that they are its material object. Seizure or occupation must go through a legality review hearing before the pre-trial control judge within the following 36 hours (art. 84); suspension of the power of disposal is requested by the prosecutor at the charging hearing or at a preliminary hearing, the judge orders it if the circumstances of article 83 are verified, and it remains until forfeiture is decided or return is ordered (art. 85). Forfeiture applies to assets that come from the crime or serve to commit it, and may reach assets of equivalent value, without prejudice to the rights of victims and good-faith third parties (art. 82). The second family seeks to protect compensation for damages: the pre-trial control judge may order, over the assets of the person charged or accused, at the request of the prosecutor or the victims, the attachment and sequestration that are necessary (art. 92), limited to what is necessary (art. 93) and not disproportionate to the seriousness of the harm and the probable sentence (art. 94). Whether a tax crime fits any of these scenarios, and who acts as the victim, is reviewed case by case; it is not taken for granted.
A DIAN attachment is something else. In coercive collection, the Administration may order, before or simultaneously with the payment order, the preventive attachment and sequestration of the debtor's assets (Tax Statute, art. 837), and the value of the attached assets may not exceed twice the debt plus interest (art. 838). There the Administration itself decides in order to secure payment of a tax; in the criminal proceeding a judge decides, at the request of the Prosecutor's Office or the victims, on the basis of forfeiture or compensation for damages. They can coexist, and each is challenged on its own front: see DIAN attachment and precautionary measure. The tax crimes are omission of assets or inclusion of non-existent liabilities (Criminal Code, art. 434A: from 1,000 SMMLV) and tax fraud or evasion (art. 434B: from 100 and up to less than 2,500 SMMLV), with the amount defined by an official assessment; their paragraphs condition the criminal action on there being no administrative appeals pending and no reasonable interpretation of the law, and provide that payment of taxes, penalties and interest extinguishes the action up to two times. For those pieces see tax evasion 434B and extinction of the criminal action by payment.