It is the portion of rent NOT subject to a subsidy by the UN at the duty station. The rental subsidy calculation is a complex formula using several main contributing factors: your duty station and what is considered to be the highest reasonable rent level you should pay in that location (maximum rent level), the actual amount of rent you pay (lease), your family composition and your income (grade level and step). The individual threshold is calculated as (monthly net salary + post adjustment) x threshold percentage rate. If your rent is less than your individual threshold, there is no rental subsidy. Your individual threshold can change with changes in base salary, post adjustment, or family situation.