Brian Wenzel
Analyst · Jefferies.
Great, great. Thanks for the question, John. So when I think about year-over-year net interest margin, right, it's down 67 basis points. The biggest driver of that if I do net funding costs, so think about your interest-bearing liability costs offset by your income coming off the investment portfolio, that's about 88 points of decline that came off of that. There's another 19 basis points decline of having a higher -- at a higher liquidity portfolio year-over-year. That's been offset by the interest of fee yield, which is plus 40. Again, as we think about how that develops for the year, the asset -- the ALR kind of mix will neutralize back out. We believe we peaked on interest-bearing liability costs from here.
So in theory, as you step through, net interest margin should really improve as you move throughout the year. To your second question around pricing, really, when you think about the various tenors. If you looked at our 12-month CD rate, we're down 50 basis points from the end of the year 4Q '23 down to [ 48 days ]. We followed our people down which is generally flat to the second quarter of 2023. All issuers or all digital banks do have promo rates. So we have one promo rate still over 5%, which is our, I believe, are 15-month and that's really to manage at the end of the day, our retention on CDs and be competitive with other people, which have kind of off tenor.
I would expect, as we see people who are trying to manage their balancing, their liquidity down, we'll follow the market down here. We generally lag the brick-and-mortar banks, but we will follow the digital banks down as we move throughout the year. The final piece I'd say, John, is we still have 3 rate cuts in, but we didn't really have them coming into September, so there's no real impact unless something was more significant and moved sooner in the year from the Fed.