---
title: Plansmith Blog | IRR Assumptions
description: IRR Assumptions |
---

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# Plansmith Blog

## [The 4Ds to Guide 2026: Deposits, Data, Decay, and Documentation](https://blog.plansmith.com/the-4ds-to-guide-2026-deposits-data-decay-and-documentation)

 Posted by [Dave Wicklund](https://blog.plansmith.com/author/dave-wicklund) on 5/1/26, 8:15 AM

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[![](https://blog.plansmith.com/hubfs/4Ds%20in%202026.png)](https://blog.plansmith.com/the-4ds-to-guide-2026-deposits-data-decay-and-documentation)

As we navigate 2026, the financial landscape continues to evolve at a breakneck pace. From my time as a Senior Examiner and Capital Markets Specialist, I've seen firsthand what separates institutions that thrive from those that merely survive. In 2026, financial leaders must prioritize what I’ll call the **"4 Ds"**: **Deposits, Data, Decay, and Documentation**. This new order reflects the true hierarchy of risk and strategic necessity. Ignore these at your peril; master them, and you secure a competitive and regulatory advantage.

[Read More](https://blog.plansmith.com/the-4ds-to-guide-2026-deposits-data-decay-and-documentation)

## [Loan Prepayments - Are You Ready?](https://blog.plansmith.com/loan-prepayments-are-you-ready)

 Posted by [Dave Wicklund](https://blog.plansmith.com/author/dave-wicklund) on 3/2/26, 7:00 AM

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[![](https://blog.plansmith.com/hubfs/Loan%20Prepayments.png)](https://blog.plansmith.com/loan-prepayments-are-you-ready)

I’ve always said that deposit pricing (a/k/a “betas”), decay rates, and asset prepayments are “the big three” when it comes to interest rate risk (IRR) model assumptions. Why is that? Well, it’s because those are the ones that most people think have the greatest impact on model results, and, as a result, those are the ones that examiners tend to look at the closest. And while I don’t always agree that prepayments matter all that much (depending on the duration of any given institution’s intermediate- and longer-term assets), the current falling rate environment is certain to again shine the spotlight on them at regulatory examinations. As such, we thought it would be a good time to review a few key concepts and then go through the best practices to be sure you’re exam ready. So first, the key concepts:

[Read More](https://blog.plansmith.com/loan-prepayments-are-you-ready)

## [Dynamic Decay Rates: Worthy Challenge or Futile Pursuit?](https://blog.plansmith.com/dynamic-decay-rates-worthy-challenge-futile-pursuit)

 Posted by [Dave Wicklund](https://blog.plansmith.com/author/dave-wicklund) on 1/2/26, 10:01 AM

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[![](https://blog.plansmith.com/hubfs/data-graphs.png)](https://blog.plansmith.com/dynamic-decay-rates-worthy-challenge-futile-pursuit)

Over the past several years, the banking industry has seen seismic shifts in deposits as trillions of dollars in Government stimulus were released into the economy, followed by a period of dramatic increases in market rates which then resulted in massive amounts of low yielding balances migrating into higher-paying CDs and non-bank investment products. Now, as deposit rates have begun to fall, we're seeing depositors look for higher yields both inside and outside the banking industry.

[Read More](https://blog.plansmith.com/dynamic-decay-rates-worthy-challenge-futile-pursuit)

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