Yes, they give you a fixed amount, and everyone has no choice in the matter that we all pay into the system. But you can leave money to your spouse or children, so benefits do not stop on the persons death.What irritates me is that they take the funds, pay you an average payment of interest and keep the principle upon your death. I’m not a fan of annuities and IPERS is an annuity.
Looks like after less than 4 years your wife will be over the threshold of what she herself has paid into the system, any payouts after that, come from the employer and the system itself. IPERS works a lot like SS in that manner, the key is living long enough to get everything back and then so, over what you paid into the system.