Are You Getting Your Full 401(k) Match? How to Check in 15 Minutes

The short version: your employer match is the highest-return money in your financial life, and three fairly ordinary mistakes cause people to miss part of it. You can check all three yourself in about fifteen minutes using your Summary Plan Description and your most recent pay stub.

Most people assume that if they are contributing to their 401(k), the match takes care of itself. Usually it does. But "usually" is doing a lot of work in that sentence, and the exceptions are expensive.

What is a 401(k) employer match?

An employer match is money your company adds to your 401(k) based on what you contribute. It is compensation you have already earned. You just have to meet the plan's conditions to receive it.

Two formulas cover most plans:

• 100% of the first 3%, then 50% of the next 2%. You contribute 5% of pay, your employer adds 4%.
• 50% of the first 6%. You contribute 6% of pay, your employer adds 3%.

Your exact formula lives in your Summary Plan Description, the document your plan is required to give you. If you cannot find it, your HR team or plan portal can send it.

For context on the ceiling: for 2026, the IRS employee deferral limit is $24,500, with an $8,000 catch-up if you are 50 or older, or $11,250 if you turn 60 through 63 during the year. Total contributions from all sources, including your employer's match, are capped at $72,000 per plan.

Mistake 1: Contributing below the match threshold

This is the most common one, and the easiest to fix.

Say you earn $90,000 and your plan matches 100% of the first 3% plus 50% of the next 2%. If you contribute 5%, or $4,500, your employer adds $3,600. If you contribute 3%, or $2,700, your employer adds $2,700.

That two-percentage-point difference in your contribution costs you $900 a year in employer money. Every year. On top of whatever that $900 would have grown to.

It happens more than you would think, usually because someone enrolled at a default rate years ago and never revisited it, or because they raised their contribution to a round number like 5% without checking whether the formula rewards 5% or 6%.

Mistake 2: Front-loading without a true-up provision

This one catches high earners and disciplined savers, which makes it especially frustrating.

Most plans calculate the match per pay period, not annually. If you contribute nothing in a given paycheck, you receive no match for that paycheck, even if you have already contributed plenty for the year.

Here is what that looks like. You earn $150,000, paid twice a month, and your plan matches up to 4%. You decide to front-load: 30% of every paycheck. You hit the $24,500 annual limit around the end of July, after fourteen paychecks. Your contributions stop automatically for the rest of the year.

You received $250 of match on each of those fourteen paychecks, so $3,500. Had you spread contributions evenly across all twenty-four paychecks, you would have received $6,000. Front-loading cost you $2,500.

Some plans have a true-up provision that reconciles this after year end and deposits whatever match you would have earned. Many do not. This is the single most important thing to look up in your plan document if you contribute aggressively.

Mistake 3: Leaving before you are vested

Every dollar you contribute is yours immediately. Employer contributions usually are not.

Cliff vesting means you own 0% of the match until a specific date, often three years of service, and then 100% at once. Graded vesting phases it in, typically 20% per year over five or six years.

If you are weighing a job change, this is worth ten minutes of your attention. Someone on a three-year cliff who resigns at two years and ten months walks away from the entire employer balance. Two more months of employment could be worth five figures.

How to check your own plan in 15 minutes

1. Pull your Summary Plan Description. Search it for "matching contribution." Write down the exact formula.
2. Search the same document for "true-up." If the term does not appear, assume your plan does not have one and spread your contributions evenly across the year.
3. Search for "vesting." Note the schedule and the date you become fully vested. Put that date in your calendar.
4. Open your most recent pay stub. Divide your 401(k) deduction by your gross pay for that period. That is your actual contribution rate, which is often not the number you think it is.
5. Compare. Is your contribution rate at or above the threshold that earns the full match? If not, raise it to at least that level.

While you are in the plan portal, it is worth glancing at the expense ratios on the funds you hold. Fees are the other quiet drag on a retirement account, and they are usually easier to fix than people expect.

What if you find a gap?

If you are contributing below the match threshold, raise your deferral rate today. It takes about two minutes in most plan portals, and it is the closest thing to a guaranteed return you will find.

If you have been front-loading in a plan without a true-up, recalculate your per-paycheck percentage so your contributions finish in December rather than August.

If you are not yet vested and a job change is on the horizon, at least make the decision with the number in front of you.

The one thing to take away

Your match formula, your true-up status, and your vesting date are three facts, and they all live in one document. Most people have never read that document. Fifteen minutes with it is one of the highest-value uses of your time as a retirement saver.

If you would rather not do it alone, or you want someone to look at the whole account rather than just the match, that is what Max Your 401(k) is for. It is a one-time, flat-fee review of your employer retirement plan: a risk assessment, analysis of your current holdings against your plan's full investment lineup, an expense ratio and fee review, a match optimization check, a live strategy session with an advisor, and a written roadmap you implement yourself. No account minimum, and nothing transfers anywhere.

Learn more about the 401(k) review and optimization service

Related reading

• Roth IRA vs 401(k): What's the Difference and Why Does it Matter?
• 3 Benefits of a Self-Directed 401(k) or 403(b)
• 403(b) for Teachers: Fees, Limits, and 6 Questions to Ask

This article is for educational purposes and is not individualized investment, tax, or legal advice. Contribution and catch-up figures are 2026 IRS limits and change annually. Plan provisions vary, so confirm your own plan's terms with your plan administrator or Summary Plan Description.