Portfolio & Risk
401(k) Explained: Match, Vesting, Fees and Rollovers
Four things inside a workplace plan decide most of your result: the match you claim, the vesting clock, the fee on the fund menu, and what you do with the money on your last day.
Your plan document holds the whole answer. Almost nobody opens it. A 401(k) is a retirement account offered through work and funded straight out of your pay before the money reaches your bank, and four decisions inside it shape most of what you end up with: whether you claim the full employer match, how long you stay to keep it, what the funds on the menu charge you every year, and what you do with the balance on your last day. The rest is administration.
Money that leaves before it feels like yours
Payroll deferral is the machinery. You choose a percentage of pay. Your employer withholds that percentage from each paycheck and sends it to the plan’s recordkeeper, and because a pre-tax deferral is subtracted before your wages are reported, the tax saving arrives quietly during the year with no form to fill in and no refund to wait for.
Earn $72,000 and set the deferral at 8 percent. That is 0.08 x 72,000 = $5,760 a year, which
lands as $480 a month across twelve monthly paychecks, and the wages reported on your W-2 fall by
the same $5,760 if you chose the pre-tax box.
The behavioural half does more work than the tax half. Money you never hold does not get spent. People who would struggle to move $480 into an investment account by hand find the same $480 disappears from a payslip without much protest, which is the single strongest argument for using a workplace plan even when its fund menu is mediocre.
The match, priced as a return
Plans state the match as a formula with a rate and a ceiling. Both numbers matter. People usually remember only the ceiling.
Take that $72,000 salary and a plan that matches dollar for dollar on the first 4 percent of pay.
| Your deferral | You contribute | Employer adds | Total going in | Match left on the table |
|---|---|---|---|---|
| 2% | $1,440 | $1,440 | $2,880 | $1,440 |
| 4% | $2,880 | $2,880 | $5,760 | $0 |
| 10% | $7,200 | $2,880 | $10,080 | $0 |
Read the first row twice. Deferring 2 percent means the plan pays you $1,440 and withholds another $1,440 it would happily have paid, and at year end that unclaimed amount is simply never paid. It does not accumulate. Nobody owes it to you later.
Read the third row too. Once your deferral clears the ceiling the employer’s contribution stops growing, so a jump from 4 percent to 10 percent is money you are saving entirely on your own terms, which is a perfectly good decision with none of the immediate return attached to the first four points.
Whose money it is yet
Vesting is the schedule under which employer contributions become permanently yours. Your own deferrals are fully yours from the first paycheck, always, with no clock attached. The employer’s share is the part that can be taken back.
Two shapes are common. A cliff schedule gives you nothing for a set period and then everything at once on a single date. A graded schedule hands you a further slice each year of service until you own all of it.
| Years of service | Three year cliff | Six year graded |
|---|---|---|
| 1 | 0% | 0% |
| 2 | 0% | 20% |
| 3 | 100% | 40% |
| 4 | 100% | 60% |
| 5 | 100% | 80% |
| 6 | 100% | 100% |
Put $9,000 of employer money in the account and leave after two years. Under the cliff schedule
you forfeit all $9,000. Under the graded schedule you keep 0.2 x 9,000 = $1,800 and forfeit the
rest. Same balance on the statement, same job, entirely different outcome, decided by a paragraph
in a document you probably received as a PDF attachment on your first day.
Pre-tax and Roth in the same plan
Most plans now let you split your deferral between two buckets. A pre-tax deferral lowers this year’s taxable wages and is taxed as ordinary income when you eventually withdraw it. A Roth deferral gives you no deduction now, and qualified withdrawals later come out free of federal tax, including everything the money earned on the way.
Defer $10,000 pre-tax while facing an illustrative 22 percent marginal rate and this year’s
federal tax falls by 10,000 x 0.22 = $2,200. The same $10,000 routed to the Roth box saves you
nothing today, and decades of growth on it are never taxed again. Which one wins depends on your
rate now against your rate in retirement. Nobody knows the second number.
One detail catches people out. Employer money has traditionally landed in a pre-tax bucket even when your own deferrals are Roth, so a Roth-only saver can still finish with a taxable slice of the account, and some plans now offer a Roth match as well, which makes it worth reading your own plan summary before assuming either. The wider version of this decision, across every account you hold, sits in tax-efficient investing.
The number you have to look up
There is an annual cap on what you may defer from your own pay, a separate and larger cap on everything landing in the account including the employer’s contributions, and an extra catch-up allowance once you reach a qualifying age. All of these are set by the IRS and adjusted for inflation, which means every figure moves, and any article quoting one is a trap waiting for somebody to plan around it three years later. Check irs.gov, or your plan’s own materials, for the current year.
The mechanism worth knowing is what happens near the cap. Match is usually calculated per pay period. Front-load your contributions and hit the annual deferral cap in, say, the sixteenth of twenty-four pay periods, and you defer nothing in the last eight, so a per-period match pays you nothing in the last eight either. Some plans run a year-end true-up that pays the difference. Many do not.
The fee nobody sends you an invoice for
Two costs apply. Each fund on the menu charges an expense ratio, a percentage of your balance taken every year whatever the fund returns, and the plan itself may charge recordkeeping or administrative fees on top. Your annual fee disclosure lists both.
Run a balance of $200,000 forward for 25 years at a 6 percent gross return with no further contributions.
| Annual cost | Net return | Balance after 25 years |
|---|---|---|
| 0.05% | 5.95% | $848,309 |
| 0.85% | 5.15% | $701,878 |
That gap is $146,431 on identical markets and an identical contribution history. The whole difference is a line in a prospectus. Most menus contain at least one broad index fund near the cheap end of that range, and where yours does, the arithmetic above is the argument for using it. Put your own numbers through the expense ratio calculator, and the mechanics of what you are paying for are in expense ratios explained.
A second menu problem is quieter. Plenty of accounts sit in the plan’s default option for years, sometimes a stable value or money market fund that was never chosen deliberately, and a decade in a cash-like fund during a long expansion costs more than any expense ratio ever will. Log in and look at what you actually hold. Then check it against the mix you meant to have, using asset allocation.
Borrowing from it, and taking it out early
Some plans allow loans. You borrow from your own vested balance, repay it through payroll with interest that goes back into your account, and the limits are a percentage of the vested balance up to a dollar ceiling set in the rules. Nothing is taxed while the loan performs. The real cost is that the borrowed money sits outside the market while you repay it, and the harsher term is what happens if you leave the employer, because an outstanding balance generally has to be settled within a short window or the plan treats it as a distribution.
A withdrawal before the retirement age written into the tax code is the expensive door. The distribution is taxed as ordinary income and the code adds a 10 percent additional tax on top, subject to a list of exceptions that Congress edits from time to time, so check the current list before assuming your situation qualifies.
Take $20,000 out early at an illustrative 22 percent marginal rate. Income tax takes
20,000 x 0.22 = $4,400 and the additional tax takes 20,000 x 0.10 = $2,000, leaving $13,600
before any state tax. You also lose every dollar that $20,000 would have earned for the rest of
your working life, and that second loss is usually the larger one. A funded
emergency fund is what keeps this door shut.
Four doors on your last day
| Option | What happens | The catch |
|---|---|---|
| Leave it in the old plan | Stays invested and sheltered | Plans can force out small balances, and you now track two accounts |
| Move it to the new employer’s plan | One account, one menu | You inherit the new plan’s fund choices and fees |
| Roll it into an IRA | Widest investment choice, often the lowest costs | No plan loans, and the choice can overwhelm at first |
| Cash it out | Money in hand now | Income tax plus the additional early-distribution tax, and the compounding stops |
The mechanics of a rollover matter more than the choice between the first three. A direct rollover moves the money from the old custodian to the new one without it ever passing through your hands. An indirect rollover pays the balance to you, mandatory withholding is taken out of a plan distribution before you see it, and you then have a limited window to deposit the full original amount, including the withheld part that is sitting with the Treasury until you file. Ask for the direct version and the problem never arises.
One hour this week covers most of this. Log in, find the match formula and raise your deferral to at least its ceiling, find your vesting schedule and note the dates, then look at the expense ratio of whatever you currently hold. The accounts around this one are covered in retirement portfolio basics.
Frequently asked questions
How does an employer 401(k) match actually work?
Your employer promises to add money when you add money, using a formula with two parts: a rate and a ceiling. A plan matching dollar for dollar on the first 4 percent of pay adds a dollar for every dollar you defer, and stops adding once your deferral passes 4 percent of your salary. Deferring below the ceiling leaves employer money unpaid for that year, and in most plans it does not carry forward.
What is vesting in a 401(k)?
Vesting is the schedule that decides when employer contributions become permanently yours. The money you defer from your own pay is always fully yours from the first day. Employer money can sit under a cliff schedule, where you get none of it until one date and all of it afterwards, or a graded schedule, where a further slice becomes yours each year of service.
How much can I put in a 401(k) each year?
The IRS sets an annual cap on employee deferrals and adjusts it for inflation, so the figure changes and any number you read in an article can be out of date. There is also a separate, larger cap covering everything that lands in the account including employer money, plus an extra catch-up allowance once you reach a qualifying age. Look up the current figures at irs.gov or in your plan's own materials before you plan around them.
What happens to my 401(k) when I leave my job?
You have four options: leave the balance in the old plan if it is large enough to stay, move it into your new employer's plan, roll it into an IRA, or cash it out. The first three keep the money sheltered and compounding. Cashing out before retirement age usually means income tax plus an additional tax on early distributions, which can remove a large share of the balance in one step.
How do I find out what my 401(k) is costing me?
Two layers of cost apply. Each fund on the menu charges an expense ratio, which is a percentage of your balance taken every year, and the plan itself can charge recordkeeping or administrative fees that appear as a separate line. Plans are required to send participants an annual fee disclosure, and the fund menu will list each expense ratio next to the fund name.