Domain name transfer: do you lose years left at current registrar?
Your domain is locked with the current expire unless cancelled or extended. During transfer the expire date remains unchanged. In this case its 2015+1=2016 if you extend after transfer.
Some registers charge transfer fees, some enforce renewals, some don't charge or enforce at all.
All registrars work differently. Some charge transfer and renewal fees, while others may not. This can also vary based on the domain extension (.com, .net, etc.). However, generally your existing expiration time will remain the same or be extended by the new registrar.
Depending on your domain extension, Gandi provides the following information as to what will happen with your current registration time.
As you can see, in most cases the expiration date is extended by one year. In some cases (detailed above), the expiration date will remain unchanged or 1 year will be added from the transfer date.
I hope this helps! Good luck with the transfer.