Higher rate savings vs early closure penalty

no_mun_no_fun

Does anyone know of an easy way to work out if it is worth switching up to higher rate savings accounts when there is a penalty for early closure of the original account i.e. 120 days loss of interest 

Catplan

This is for isa but might work in your case or give an idea

https://www.moneysavingexpert.com/savings/isa-switch-calc/