A Statutory Demand is not a court document. However, it is dated at the time of issue and, theoretically, does not expire. However, you will have to give reasons if you wait more than four months to take further action.
Receipt of a Statutory Demand creates a window of 21 days, during which time the recipient must either pay the debt or agree on a payment plan with the creditor. If an individual disputes the debt, they have 18 days to apply to the court to set aside the demand. If a company disputes the debt, it must apply to the court for an injunction before the 21 day period expires.
In reality, Statutory Demands trigger a rapid chain of events whether the debtor responds or not, irrespective of how the debtor counters the Statutory Demand.
Statutory Demands are often used as evidence to the court that a debtor is unable to pay their debts as part of bankruptcy proceedings. A creditor relies on Statutory Demands when issuing a winding up petition or a bankruptcy petition.
Statutory Demands are very powerful as they have a domino effect that can lead quickly to personal bankruptcy or company liquidation.
Statutory Demands remain in force and valid until events overtake them and make it clear that they have outlived their usefulness — for instance, the winding up of a company.