Every Domain expires at after 1 year (365 adys) or after the number of years you subscribed for. Once the domain expires, you will have thirty (30) days grace period to renew it at the regular amount/price.
After the 30 days, if you do not renewal the domain, it will enter the redemption period which lasts for about 60 days. During the redemption period, the amount to renew the domain become higher.
After the redemption period the domain will be deleted from the system and it will be available for anybody to register and take ownership. The previous own will loose the ownership.
THerefore, we advice you renew your domain on or before the expiration date.