How to read a 401(k) match and vesting schedule in a job offer

What to take away

What a 401(k) match actually is, in formula terms

A 401(k) match is an employer contribution tied to what you defer from your own pay. The plan document states it as a formula, not a promise.

Common shapes include 100 percent of the first 3 percent of pay, 50 percent of the first 6 percent, or a flat percentage of eligible compensation regardless of what you defer.

The formula has three moving parts: the match rate, the deferral ceiling it applies to, and the compensation definition. A 50 percent match on the first 6 percent of pay tops out at 3 percent of salary. A 100 percent match on the first 5 percent tops out at 5 percent.

Compensation definition matters as much as the rate. Base salary only, base plus bonus, and total cash compensation produce different employer contributions for the same person. When a plan excludes bonus, the employer contribution is calculated on a smaller base.

True-up contributions fix a timing problem. If you front-load your deferrals and hit the annual limit in October, a plan without a true-up stops matching in October. A plan with a true-up reconciles at year end and pays the difference.

What is a typical match, and what do the IRS limits allow?

For a market benchmark, use Vanguard's annual How America Saves report. Recent editions put combined employee and employer contributions at around 12 percent of pay, with employers supplying roughly 4 to 5 percent, and a match of 50 percent of the first 6 percent is often cited as the most common design. Check the latest edition for current figures.

The IRS sets limits each year. For 2026 the elective deferral limit is $24,500, and the catch-up for participants 50 and older is $8,000. A higher catch-up of $11,250 applies at ages 60 to 63. The total of employee and employer contributions is capped by Section 415(c) at $72,000, before catch-ups. The IRS retirement plans page publishes the current limits, catch-up rules and vesting requirements.

Roth and after-tax options change how the money is taxed. Roth 401(k) deferrals count toward the same $24,500 limit as pre-tax deferrals. After-tax contributions, where a plan allows them, fit inside the $72,000 total. Under SECURE 2.0, higher earners must make catch-up contributions as Roth from 2026, so check whether the plan offers a Roth option. Employer matches typically go into the pre-tax account unless the plan allows a Roth match.

How energy and biotech employers differ

Houston and Boston employers use the same formula vocabulary: match rate, deferral ceiling, compensation definition and vesting schedule. The plan document states the terms that apply to each offer, and no city label predicts them.

Houston's large employers are mostly in energy: producers, midstream operators, oilfield services and engineering firms. Some large employers in cyclical industries pair a 401(k) with a pension or cash balance plan, so a recruiter's single percentage may cover only one piece. Ask which plan the percentage belongs to.

Boston's major employers are in life sciences: large commercial drugmakers, clinical-stage companies and contract research organizations. Plan design tends to follow company stage more than sector. A young company may offer a small match or none, and equity can outweigh the match in value while carrying its own vesting and liquidity risk.

Illustrative formulas show how much plans can differ. These are examples, not any named employer's terms:

Texas has no state income tax and Massachusetts does, so take-home pay differs at the same gross salary. That does not change the match formula. Tax on withdrawals depends on the state where you live when you take the money out. Put these differences in your total compensation comparison. The same title carries different pay and benefits in different sectors, as the guide on how HR business partner salaries vary by industry shows.

ERISA plan rules that constrain every match design

ERISA, the Employee Retirement Income Security Act, sets the federal floor for private-sector retirement plans. It does not require an employer to offer a match. It requires that whatever the plan promises is funded, disclosed and administered according to the plan document. The U.S. Department of Labor's Employee Benefits Security Administration enforces its reporting and fiduciary rules.

Four constraints shape match design:

Nondiscrimination testing is the constraint that surprises people. If rank-and-file employees defer at low rates, highly compensated employees can have their contributions limited or refunded the following year. That is why some plans use a safe harbor match. A basic safe harbor match vests immediately, while a qualified automatic contribution arrangement can use a two-year cliff, in exchange for looser testing.

ERISA also governs how you get information. Request the summary plan description from the plan administrator in writing. Most plans file an annual Form 5500 report, which is public through the Department of Labor, and shows plan size and fees. If the administrator will not provide documents, that is a compliance problem, and the Employee Benefits Security Administration takes participant questions.

How vesting schedules affect an offer

Vesting is the schedule that determines how much of the employer's money you keep if you leave. It applies to employer contributions, never to your own deferrals, which are always 100 percent yours.

The practical difference between schedules is how much of the employer contribution you keep at each point in your tenure. Use the table to find the percentage vested when you expect to leave.

The table below shows five vesting structures. Percentages show how much of the employer contribution you own after each year of service.

The table shows how the schedules differ: immediate vesting preserves the full employer contribution from the start; cliff schedules vest all at once; graded schedules increase ownership over time.

Here is a hypothetical example. Two offers, both with a $120,000 base salary. Offer A: 100 percent of the first 6 percent, three-year cliff. Offer B: 100 percent of the first 4 percent, four-year graded. You defer 6 percent at both.

Offer A pays $7,200 a year in match and you own all of it after year three. Offer B pays $4,800 a year and you own 25 percent after year one, 50 percent after year two, 75 percent after year three and all of it after year four.

Leave after two years. Offer A pays you nothing in match. Offer B pays you 50 percent of $9,600, or $4,800. The smaller match wins because the vesting is graded.

That is the comparison that matters, and it is why salaries and advancement advice that ignores vesting misses half the offer. Pay bands and benefit design move together.

How to read match language before you accept an offer

Offer letters rarely spell out the match. Recruiters quote a percentage, and the plan document decides what it means. Read the summary plan description before you negotiate anything else.

Use this checklist on every offer:

Then run the numbers on your own deferral rate. If the formula is 100 percent of the first 6 percent and you defer only 2 percent, you receive a 2 percent match and leave 4 percentage points unclaimed. The employer pays on what you put in, up to the formula ceiling.

Compare the match against the rest of the package. Base salary, bonus target, equity and health premiums all move the total. A lower base with a fast-vesting match can beat a higher base, and the reverse is true when equity is real.

Vesting also sets the clock on your next move. If you leave before the cliff, the forfeited match belongs in the offer math, not in a footnote. If a company will not put the match formula in the offer packet, treat the verbal number as marketing.

Pay data for other fields sits in the management careers salary guide, and the public accounting salaries at US firms compared by city guide shows how one sector writes retirement terms into its offer letters.

Common questions