When Does a Roth Conversion Make Sense If Your Income Is About to Change?

A Roth conversion moves money from a traditional retirement account into a Roth account and generally creates taxable income in the year of the conversion. Whether it makes sense depends on the tax cost today, your future income, and how the conversion fits into your broader retirement plan.

So, when does a Roth conversion make sense?

The question isn't whether Roth accounts are good or bad.

The question is whether converting some of your tax-deferred savings makes sense given your tax situation and timeline.

What happens when your income changes?

Let's say you're approaching retirement.

You've been earning $150,000 a year. After retiring, your income may be lower.

That change can affect the tax calculation for a Roth conversion.

But here's the thing: a lower-income year doesn't automatically mean a conversion is beneficial.

A conversion generally adds the taxable portion of the amount converted to your income for that year. The effect depends on your other income, deductions, filing status, and applicable tax rules.

Why does the timing matter?

A Roth conversion is a tax decision tied to a timeline.

When is your income expected to change? How long might that period last? When might Social Security, pension income, or required minimum distributions begin?

For some people, the years between retirement and the start of other income sources may create a different tax picture. For others, the conversion may not provide a meaningful benefit after considering the current tax cost.

The point is to examine the timeline—not assume the gap is automatically an opportunity.

How much should you convert?

Let's use a simplified example.

Suppose you have $500,000 in a traditional IRA and your taxable income is $70,000 before a conversion.

If you convert $20,000, the taxable portion of that conversion is generally added to your taxable income. That does not mean your entire income is taxed at one rate. Different portions of income may be taxed at different rates, and the actual result depends on your full tax return.

A larger conversion could cause more income to fall into higher tax brackets or affect other tax-related calculations.

That's why the amount matters as much as the decision to convert.

What else can affect the tax impact?

A conversion may affect more than your federal income tax. Depending on your circumstances, it can affect state income taxes, the taxation of Social Security benefits, Medicare income-related premiums, or other income-based thresholds.

The tax treatment of a conversion and the rules that apply can change. Future tax rates and future income are also uncertain.

What should you compare before making a decision?

Start with the overall timeline:

Income before and after retirement

Expected Social Security and pension income

Traditional and Roth account balances

Potential required minimum distributions

Different possible conversion amounts

The estimated tax cost and how it would be paid

Other tax or benefit effects that may apply

Then compare the projected tax picture with and without a conversion.

The answer may be to convert some money, convert at a different time, or not convert at all.

The goal isn't to predict the future perfectly. It's to understand the tradeoffs before making a decision.

Always consult with a tax professional.