Beware the retirement savings 'time bomb,' tax expert warns

It’s all about the taxes.

That’s the key concept for retirement savers specifically because IRAs and 401(k)s are only tax-deferred — not tax-free.

“These funds have not yet been taxed, so you need a plan to minimize these taxes [so you] can keep more of your hard-earned retirement money,” Ed Slott, a certified public accountant in New York and an expert on IRAs, told Yahoo Finance. “It’s what you keep that counts.”

This planning has always been the core of Slott’s retirement tax planning strategies. “Always pay taxes at the lowest rates,” Slott told Yahoo Finance. “People miss this critical point and often end up paying much more in taxes in retirement — when you’ll need the money the most.”

Slott is the author of the new book "The Retirement Savings Time Bomb Ticks Louder: How to Avoid Unnecessary Tax Landmines, Defuse the Latest Threats to Your Retirement Savings, and Ignite Your Financial Freedom." Here's what he recently told Yahoo Finance about minimizing taxes in retirement, edited for length and clarity:

Read more: 3 ways retirees can save on taxes

Yikes. Scary title to your new book, Ed. What is the retirement savings bomb, why is it ticking louder?

The time bomb is the tax embedded in every traditional IRA and 401(k) account that is tax-deferred. I’m not talking about Roth IRAs and 401(k)s.

The reason I'm saying it's ticking louder — I always felt it was ticking — but now it's really loud is, at some point, taxes are going up to pay the big debt this country is facing. People complain about taxes. But the top federal tax rate from 1946 through 1963 was 91%. In 1964, it went down to only 77%. I was only 10 years old then, but I heard the whole country did a happy dance. Look where we are today. The top rate is 37%.

Provisions in the 2017 Tax Cuts and Jobs Act (TCJA) that lowered individual tax rates are scheduled to expire on Dec. 31, 2025, unless Congress acts to extend them. So you have less than two years left where you can take advantage of today’s rates before they might go back up.

Ed Slott
People often end up paying much more in taxes in retirement — when you’ll need the money the most. according to tax pro and author Ed Slott. (Photo courtesy of Slott) · DEMILIO PHOTOGRAPHY

What’s the foundational principle of all good tax planning?

Always pay taxes at the lowest rates. People don't do it because they don't want to pay tax before they have to. So the idea of converting to a Roth IRA bothers them. The way I see it, you need to use these two years to get money out of those taxable accounts. Start trimming those IRA balances while you can get them out at the lowest rates and move them away from the tax man into what I call tax-free territory in a Roth account.

What is the single greatest threat to retirement dreams?

Future taxes. I am worried about tax rates rising for people in their retirement.