Although there are many upsides to legal separation, legal separation has its disadvantages. If you go through with legal separation you will not have the opportunity to get married to someone else unless you first get divorced - you are still legally married after getting separated., Another disadvantage is you will have to pay extra costs down the line if you decide to eventually get legally divorced. If you find there are no benefits to being legally separated from your spouse, you might look to get a divorce instead, resulting in more legal fees.