401(k) Spend It or Save It Calculator
There are several ways to manage your 401(k) when you leave an employer. Making the wrong decision can cost you thousands of dollars both in taxes and lost earnings.
How the 401(k) spend it or save it calculator works
It nets your 401(k) against income tax and, if you are under 59½, a 10% early-withdrawal penalty to show the cash in hand, then projects what the balance would become if left invested to retirement.
Worked example: with 401(k) balance of $25,000, your current age of 35 and marginal tax rate of 24.00%, the 401(k) spend it or save it calculator shows value at retirement if you save it of $190,306.
- Cash if you spend it now
- $16,500
- Taxes owed
- $6,000
- Early-withdrawal penalty
- $2,500
- Value if kept to retirement
- $190,306
The formula
Cash now = balance − tax − (under 59½ ? 10% penalty : 0). If saved = balance × (1 + return)^(years to retirement).
Results are estimates for educational purposes and are not financial advice. Confirm exact figures with your lender, plan administrator or advisor.
Questions about the 401(k) spend it or save it calculator
Should I cash out my 401(k) when I change jobs?
Rarely. Cashing out triggers income tax plus a 10% penalty if you are under 59½, and you lose decades of tax-deferred growth — often the most costly money mistake.
What are my alternatives to cashing out?
Leave it with the old employer, roll it into your new employer’s plan, or roll it into an IRA. All keep the money growing tax-deferred and avoid tax and penalty.
How much does cashing out really cost?
Beyond the immediate tax and penalty, the biggest cost is the lost future growth — the calculator shows what the balance could have become by retirement.
Is the 401(k) Spend It or Save It Calculator free to use?
Yes. Every calculator on FinCalculators is completely free, with no sign-up, login or paywall. You can run as many scenarios as you like.