Your buy-back cost is based on factors such as your age, salary and when the service occurred. The cost of the service is its “actuarial value,” or simply put, what your future pension is worth in today's dollars with the added service.
You can use the Retirement Income Estimator on the myOMERS secure member site or call OMERS Member Services to see how buying service will increase your pension. When you know the cost and the increase to your pension, you can decide whether buying service is for you.