As noted, dues are paid for the calendar year. For an August use year, that would be Jan-July (7 months) of the 2003 use year and 5 months of the 2004 use year (for this year). While it's negotiable on a resale (as is all else), this is the neutral position to take and evaluate who should pay which dues. If you get the line "you get the points this year, so you should pay the dues", you know immediately that this person doesn't truly understand what's involved in a resale with
DVC. That's understandable with some, but not the ones that deal with DVC routinely. If you signed a contract, it's likely that contract included who pays what dues. If it does and you signed it, you should pay what the contract states, even if it's more than you should have paid otherwise. On a resale, it's not when you close but how many points you are getting. AS a general rules, I'd pay no dues on banked points that will expire in less than 6 months.
Example - August use year 200 points. If you are buying now and closing soon, here's my thoughts. IF you are getting all 2002 points banked to the 2003 use year, all 2003 points and all 2004 points; a fairly nuetral position would be for you to pay half of last years dues plus all of this years. If you had the same scenario except no banked points, I'd pay this years only. If you had only the 2004 points but minimal or no 2003, the MAX you should pay is 5 months of dues.
Of course you would need to look at the overall deal to decide what's truly worthwhile for you and if it's worth holding up the deal over. In many situations, I think this is a make or break issue to determine the reasonableness of a given resale deal.