Greg Becker
President and Chief Executive Officer at SVB Financial Group
Yeah, it's a great question and maybe that should have been awarded. The growth rate of the balance sheet and that's what's driving it. So to your point, if you just have a static sized balance sheet and it doesn't grow in a low rate environment, you're not or a flat rate environment, you're not going to get a lot of lift out of it. But I think the point is, we've seen, and that's what's equated the massive tailwind going into 2022 for net interest income.
It is the acceleration of the growth of the balance sheet that we've seen. So it's really a combination. It's really that -- if the way it should have been awarded. Now, what you didn't ask and but I will answer is this, which is what we're really excited about is at some point, we certainly believe that there will be some rate increases.
And we have a slide in the deck that goes through and talks about how spring-loaded the balance sheet actually is for additional NII if we do see rate increases. In Slide 19, and you can go through that and look at every quarter percent increase in the balance sheet, the way it is right now is $106 million again modeled in on an annualized pretax basis for each 25 basis point increase.
But in addition to that, with the first 25 basis point increase, we also expect somewhere between $195 million and $225 million of increased core fee income generated from the large off-balance sheet funds that we have. So again 125 basis point increase, you could see revenue growth of roughly $311 million to I'm sorry -- yeah, $311 million to roughly $325 million or $330 million. So the normalized after this when the second rate increase happens. But the balance sheet is clearly spring-loaded.
So we're happy that we can continue to grow NII in a low rate environment. But we're even more bullish. We do start to see some rate increases.