@estherkinyua Sounds like you're misunderstanding your coverage.
The upper limit of the collision coverage for
your own car is normally whatever the total value of the car is. The $50k you're referring to is probably your
liability limit, which is for damage to
other people's cars/property. Policies like agreed/stated value policies exist that do have a limit for your own car, but those types of policies are almost exclusively for collector cars.
In a total loss you get paid whatever the current market value of the car is.
You'll want to ask how sales taxes work as they are handled differently in each jurisdiction.
If you're in one of the ~26 states with annual
property/excise taxes on vehicles then you can usually get a pro-rated refund on those from the state/city/town (depending on how your jurisdiction collects those taxes).
After your insurer pays you they will seek the money back from Geico. Assuming all they can get back is $25k you'll either get the first $500/$100/whatever your deductible is, or you'll get a pro-rated portion of your deductible. Ask you insurer which way it works. The question to them is: "Am I "made whole" first?"