There are three real options for a 401(k) at retirement: leave it in the plan, take a full cash distribution, or roll it to an IRA. The first two are frequently misjudged — leaving it can be right if the plan is good and cheap, and taking cash is almost always expensive.
A form arrives shortly after your last day and it makes three options look equally reasonable. They are not.
The right answer depends on the specific plan you are leaving, what it costs, what it holds, and how the rest of your assets are arranged.
Leaving it where it is
This is more often defensible than people assume. Large plans can offer institutional share classes at costs an individual cannot access retail, and some hold a stable value fund with no direct equivalent outside the plan.
The questions to answer are what the plan actually costs you all-in, what the investment menu contains, and what withdrawal flexibility it allows in retirement. Some plans permit only limited distributions per year, which is a genuine constraint when you are trying to manage income by the dollar for tax purposes.
Taking a full cash distribution
This is almost always the expensive answer. The entire pre-tax balance becomes ordinary income in a single year, which can push a household through several brackets at once, and if you are under the relevant age threshold a penalty may apply on top.
The knock-on effects are frequently larger than the tax itself: a spike in that year's income can affect Medicare premium surcharges two years later and the taxation of Social Security. A balance built over thirty years can lose a large share of itself to one form.
Rolling to an IRA
A rollover generally offers the widest investment selection and the most control over the timing and size of withdrawals — which matters a great deal when withdrawals are being used to manage a tax bracket.
The trade-off is cost and complexity. Retail investments can be more expensive than institutional plan options, so it is worth comparing rather than assuming. There are also creditor protection and, depending on age and employment status, early-access rules that differ between a workplace plan and an IRA.
Consolidation, and the mistake that costs real money
For most households, bringing scattered accounts together makes the plan easier to manage and easier to coordinate — one allocation, one withdrawal strategy, one set of beneficiaries to keep current.
The mistake to avoid is mishandling the transfer itself. Pre-tax, Roth, and after-tax balances must land in the correspondingly correct account type. We recently worked with a client whose transfer sent money to the wrong account type and created an avoidable tax consequence. Direct trustee-to-trustee transfers, with the tax character of each dollar confirmed in advance, are designed to prevent this.
There is no universally correct answer, which is why the form should not be filled out quickly. Evaluate the costs on both sides, the investment options on both sides, the withdrawal flexibility you will need, and the tax character of every dollar being moved — then decide.