There are three banking deadlines:
From the start of your use year
through the end of the sixth month, you can bank up to 100% of your points.
From six months to the
end of your ninth month, you can bank a cumulative total of up to 50%. So, if you banked 50% in the first six months, you would not be able to bank anything else. If, you'd banked 40% in the first six months, you could bank an additional 10%.
During your
tenth month, you can bank up to a cumulative total of 25%. There is no banking the last two months of your use year.
When you see a post from Caskbill, click on the link in his signature and download his
DVC Planner software. It's free for personal use, and it contains a world of features, including the ability to enter all of your contracts and then bring up the banking deadlines for each contract. Very well written and useful software.