A Future Insurability Option (also called Guaranteed Insurability Option or GIO) lets you increase your monthly benefit at specified life events without further medical underwriting. Common trigger events include marriage, becoming a parent, taking out or increasing a mortgage, starting a business, or receiving a salary increase above a defined threshold. The size of the increase is usually limited (often a percentage of your existing benefit, capped at a stated maximum) and must be applied for within a defined window after the trigger event (commonly 30-60 days). Some policies also include automatic CPI indexation as a separate feature. The value of GIOs is most apparent if your health later deteriorates — you can still increase cover up to the policy's allowable amount without re-disclosing health changes. Each policy has different rules about how often you can use the option, the maximum total increase, and which events qualify. The premium increases proportionally to the new benefit amount. Read the PDS carefully so you don't miss the application window after a qualifying event.