From
FAQ under dvcbyresale
Q. What does the term "Use Year" mean?
A. The use year refers to the twelve month period starting on the first day of the month of your assigned use year. Each year, Disney will add your annual allotment of points on the first day of your use year. Any previously banked points become available as well. Any borrowed points expire during the use year they were borrowed and should be used prior to your use year anniversary month.
For example: A February "use year" begins February 1 20XX and ends January 31 of the following year. A June use year begins June 1, 20XX and ends May 31 of the following year.
Some people have December use years, which means their points don’t physically get put into their account until December, but everyone gets points each and every year and has one full 12 month period to use those points. (Provided no banking or borrowing has been done.)
Q. Is it important to have a specific use year?
A. Some people prefer specific use years, because they travel the same time every year. To understand this concept it is important to understand the banking rules. If you vacation during the same month EVERY year and plan on doing so for the next 35 years or so, then you might pick a use year right before or during the month you travel, for one reason only: If you need to cancel one year, you are still within your initial 100% banking window that Disney designates as the first 8 months of your use year.
If you travel during various times of the year, like most folks, the use year should not be a consideration for you. We recommend you look for the best resale value at the property you want to own and disregard the use year reference.
Q. How does borrowing work?
A. Disney allows you to borrow 100% of your upcoming year’s annual allocation once you are in the previous use year. Once you "borrow" points, you may not "put them back", and they will expire in the current use year if not used.
Q. How does banking work?
A. Effective Januayary 1, 2008, a single banking window for banking Vacation Points goes into effect. This new banking window allows you to bank up to 100% of your available Vacation Points during the entire first eight months of your current use year.