A new question every week

Move the slider. See what the decision changes.

Each What-If Lab starts with one retirement question. It shows the rules and gives you a picture that changes with your choices. We add one new lab each week. No signup. No answer that claims to fit everyone.

Available now

What does one more working year really buy you?

Move the retirement date. See how one more year can add savings, add growth, and shorten retirement.

Try the interactive lab →
Available now

How much can $500 less monthly spending change?

Change monthly spending. See how much income and savings the new goal may need.

Try the interactive lab →
Available now

How much rental income is really retirement income?

Subtract empty months, property bills, and repair savings from rent. See what may truly be left to spend.

Try the interactive lab →
Available now

Can part-time work bridge an earlier retirement?

Change monthly pay and the number of work years. See how much less you may need to take from savings.

Try the interactive lab →
Available now

What can a 1% advisory fee cost over time?

Compare a fee based on account size with a lower-cost choice. See the fees and the growth those fees may have earned.

Try the interactive lab →
Available now

What does delaying Social Security actually change?

Compare start ages, monthly checks, and the age when total checks may catch up.

Try the interactive lab →
Available now

What does the health-insurance bridge to Medicare cost?

Add monthly plan costs, other medical bills, years to Medicare, and rising prices.

Try the interactive lab →
Available now

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 the interactive lab →
Scheduled

How much downturn runway can a cash reserve buy?

See how many months your cash could cover the part of spending that normally comes from investments.

Available on the date above
Scheduled

What can inflation do to a retirement spending target?

Change the rise in prices and your retirement date. See what today's monthly spending may cost later.

Available on the date above
Scheduled

What changes if the mortgage is paid off at retirement?

Compare the cash needed to pay off a mortgage with the lower monthly bill and the time needed to earn that cash back.

Available on the date above
Scheduled

How large could a long-term-care funding gap become?

Test care cost, years of care, insurance, and rising prices. See what savings or family may have to cover.

Available on the date above

Need the full explanation before the next lab arrives?

Browse the retirement guides