Does a soldier have to pay for leave?

As in pay to receive leave? No, leave is accrued monthly at a rate of 2.5 days per month, if I recall correctly. When used (under the Commander's approval), it is essentially paid vacation.

Christine Candelaria I think we need some more info to assist.
If you mean pay for transportation while on leave the answer is, yes, and no..
If the member is overseas and taking regular leave, the service pays to get them to the stateside point of entrance, and the member pays to the final detestation.
If the member is deployed to a combat area, and is given environmental leave, they will be transported free of charge to the assigned duty station and sometimes a different place they desire to take leave......there are business rules that govern this and they are perishable so Id not want to say what is what today when my info is more than a year old.
So what we need to give specific help is the specific type of leave the member is tacking? Under what conditions? Regular? environmental from a deployed location? emergency?

The only time I can imagine you would be required to pay for leave is if you were granted excess leave (for example, in an emergency) and you separated from service before you had accrued enough leave to make up for the advance. Otherwise, no.