Also, please clarify what you mean by being “$50k ahead”. Hopefully, the extra you have been paying is going towards principal reduction and not towards future payments. These are very different things.
Recast is usually done to reduce the payment for the remainder of the term based on the current balance. If you are going to make the same payment, or don’t need the reduced payment, no benefit in recasting unless you simply want the flexibility of a smaller required payment. Since it’s probably going to cost you some kind of fee, no benefit in your apparent situation. The math will be the same.
They should be able to give you a new amortization table so you can see the exact payment and how much of the new payment will go towards principal and interest, then compare that to your current.
