The cost of a purchase will depend on when you choose to make it.
If you make a purchase within six months after the end of your leave, the cost is two times your contributions.
If you wait longer than six months, the cost is the greater of two times your contributions (based on the rates at the time of the purchase) or “actuarial” cost (which means the true cost of adding that amount of service to your pension). Generally, the longer you wait, the more the leave costs.
Keep in mind: If you don't meet the original payment deadlines, the cost that you've been quoted will be recalculated. This is because the combination of your age, earnings and years of membership will increase over time.