Under the FDCPA, no collection agency can take a legal action against you for non-payment of debt once the Statute of Limitation (SOL) period expires. However, if a collection agency tries to collect on a debt and threatens to sue you even after the SOL expires, you should use the Expired SOL Notification Letter to make them aware of your rights in such a case. A sample format of the Expired SOL Notification Letter is given below.