Similar question (I apologize in advance for hijacking the OP's thread and apologize profusely for all of the math required)...
I have a pretty thorough understanding of borrowing/banking and which points get used first, so I think I have this right, but want to verify before borrowing additional points...
I have an April UY. I made a reservation at my home resort for 5 nights in mid-June, 2024 (1BR) using both 2024 points and some banked from 2023.
The current reservation uses 180 points total and I still have 28 points left in the 2024 UY.
I'm planning on trying to switch to an OKW 2BR for 6 nights at the 7-month mark. That reservation will require 221 points. So I would have to use the remaining 28 points from 2024 and borrow another 13 points from 2025. With me so far?
I'm thinking of adding another night in the 1BR at my home resort now to ensure we have that 6th night reserved (although I'm pretty confident OKW will have availability when I get ready to switch, this would be a safety net). To do that will need another 48 points. So I would be using the remaining 28 points and borrowing an additional 20 points now).
That would put my current reservation at 228 points. When I switch to OKW 2BR, it would be 7 points LESS.
Here's my main question...
Modifying the reservation in mid-November (7-month window) would use banked/borrowed points first and the 7 excess points that get returned would be 2024 UY points that I could still bank into 2025 since my 7-month window for modifying is before my banking deadline of November 30th, correct?
I just want to make sure that when I modify and use 7 fewer points, that I'm not orphaning 7 borrowed points in the 2024 UY. Even if that occurred, we would have all the way until March of 2025 to use them, but I'd rather not shorten shelf life of points unnecessarily.
TLDR: If I borrow 20 points now instead of 13 in November, the extra 7 borrowed points will be the ones used for my modified reservation, freeing up 7 current points from that reservation that could then be banked, right?
Is there any downside to borrowing the excess points now? The upside is that we would have a reservation already secured for the 6th night in case there wasn't 2BR availability elsewhere.