14 May 2025. Mark it on your calendar. That's the date when OFSI sanctions checks become mandatory for all landlords. Not optional. Not recommended. Mandatory. Mary landlords don't understand what OFSI is, why sanctions check matter, or how to do them. This is a critical gap in compliance knowledge. The penalties for non-compliance are severe: unlimited fines and potential criminal liability. This guide explains what OFSI sanctions check are, why they matter, how to do them,