Can AI manage my 401(k)?

Plan documents are text: the fund menu, the expense ratios, the match formula, the vesting schedule. A model reads all of that faster than you will.

Live balances depend on whether your recordkeeper exposes them, and many do not connect to anything outside their own portal.

Execution is the hardest wall. Even where balances can be read, changing an investment election generally happens inside the plan portal and nowhere else.

An employer match is a return no market provides. A formula matching half of the first 6% you contribute pays 50% on that money immediately.

Contributing below the match threshold leaves that behind every pay period, and it is the single most common expensive mistake in a 401(k).

Vesting decides whether the match is yours. A schedule requiring several years of service means leaving early forfeits part of it, which matters when you are weighing a job move.

Two funds tracking the same index can charge very different amounts inside a plan, and the difference is deducted quietly rather than billed.

Plan-level administrative costs sit on top of fund costs, and both appear in disclosures participants receive and rarely read.

Over thirty years, a percentage point of annual cost compounds into a difference large enough to be worth an afternoon of reading.

A 401(k) is not a portfolio on its own. Someone holding technology stocks in a taxable account and a total-market fund at work is more concentrated in technology than either account suggests.

Assessing that requires seeing everything at once, which is the analysis job software is genuinely good at.

Asset location follows from the same view. Assets that generate ordinary income tend to belong in a tax-deferred account, and holdings you expect to grow have a case for a Roth.

The employee deferral limit is $24,500. From age 50 a catch-up of $8,000 applies, and at ages 60 to 63 it is $11,250.

Employer contributions sit on top of the employee limit, so a match does not reduce what you can defer yourself.

Both figures are published by the IRS and change most years, so a plan set once and never revisited quietly falls behind the ceiling.

Four options exist and they are not equivalent: leave it in the old plan, roll it into the new employer plan, roll it to an IRA, or cash it out.

Cashing out is the expensive one. Tax applies immediately and a 10% additional tax generally applies before 59.5, and the balance stops compounding.

The comparison worth doing before deciding is fees and fund quality in the old plan against the new one, since a good institutional plan sometimes beats an IRA on cost.

Contribution limits are from the IRS announcement 401(k) limit increases to $24,500 for 2026. Plan types, vesting and participant disclosures are covered by the Department of Labor at Types of Retirement Plans. Walnut is informational and is not an investment adviser. This guide is educational and not personalized investment or tax advice.