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Weekly What-If Lab

How large might a Roth-conversion window be?

Enter this year's taxable income and a limit. See how much room may be left and a rough tax cost.

Try your version

How much income can you intentionally recognize this year?

Move one slider at a time. The numbers and picture update together.

$80,000
0300,000
$120,000
50,000400,000
$50,000
0250,000
24%
1040
Room below chosen ceiling$40,000before the proposed conversion
Conversion within that room$40,000not a tax recommendation
Simplified current tax$12,000one rate applied to the full conversion

This is not a tax return. Real taxes use several rates. A conversion can also change credits, investment taxes, Social Security taxes, health-plan savings, Medicare costs, and state tax.

A conversion is taxable income now

Money moved from a traditional IRA to a Roth IRA is usually added to income for that year. It is not a tax-free name change.

The lab uses one tax rate you choose. A real tax return uses several rates and many rules.

The best size may be partial

Several smaller conversions may use lower-income years without one giant tax bill. Your limit may come from a tax rate, health-plan savings, Medicare costs, or the cash you have for taxes.

Wait until you can estimate the year's income, but leave time to act. Check the choice with a tax professional first.

Verify before you act

These official resources provide background for the concepts in this illustration: