New retirees might enter a different environment than their predecessors--the economy or market might have changed slightly or dramatically.

Morningstar researchers have investigated and identified their latest starting safe withdrawal rate. Hint: it's slightly lower than last year.

Here to discuss this research is Amy Arnott, a portfolio strategist with Morningstar. The interview has been edited for length and clarity.

A: The goal was to estimate how much you can safely withdraw from your portfolio during retirement.

This is one of the most difficult questions that people will face during their financial lives. When you're saving for retirement, it's pretty straightforward as long as you start early and you're consistent. But when it comes to your retirement portfolio and figuring out how to turn it into a paycheck for yourself, that gets more complicated.

There's the danger of running out of money during retirement, but on the other hand, a lot of people actually end up underspending. So, there's a balance between spending enough that you can enjoy your retirement, but not spending so aggressively that you might have to cut back later in life.

Most retirement withdrawal research is based on looking at historical market data. This started with William Bengen's landmark paper in 1994, which looked at market data going back to 1926 and figured out the highest withdrawal rate you could have made that would've survived. That's the origin of the 4% rule.

But we decided that instead of looking at past data, we would do something more forward-looking, using market estimates for possible future returns.

A: The base case is the foundation of where all our research starts, and it assumes that you want to create a steady paycheck equivalent throughout retirement.

It assumes that you take a certain withdrawal rate, say 4%, and apply that to your starting portfolio balance. That becomes your first-year portfolio withdrawal, and then each year after that, you adjust that dollar amount for inflation. So you're basically keeping a steady spending amount and never changing it.

The reason it's conservative is that we're looking for a very high probability of success. We're also looking for a very long time horizon, assuming a 30-year retirement period.

And finally, we're using conservative estimates for market returns. So we build in a buffer so that we're not assuming the best-case scenario, but also there's a bit of a cushion built into the numbers in case things don't go as well as expected.

A: It comes down to the assumptions that we used for market returns. In both 2023 and 2024, we saw equity market returns of about 25%, so very strong market performance. And the past 15 years were actually the best 15-year period for stocks that we've seen going back to 1970.

So we now have a situation where valuations are relatively high on stocks, which leads to the possibility that maybe future returns could be lower.

So, we reduced our return assumptions for stocks and across different sub asset classes and then also on the bond side. Since we had three rate cuts last year during 2024, bond yields are lower, which again suggests that future returns are probably also going to be a bit lower.

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This article was provided to The Associated Press by Morningstar. For more personal finance content, go to https://www.morningstar.com/personal-finance

Amy Arnott is a portfolio strategist for Morningstar. Ivanna Hampton is lead multimedia editor for Morningstar.