Merck Employee Benefits: The Complete 2026 Guide

About this guide. Align Financial Solutions is not affiliated with, endorsed by, or sponsored by Merck & Co., Inc. Plan provisions described here are drawn from public filings and Merck’s own published materials where a source exists, and were last reviewed on September 25, 2026. Employers change plan terms, and terms frequently differ by hire date, job level, location, and collective bargaining status, so what applies to you may differ from what is described here. Your own plan documents and your employer’s benefits team are the authority. Nothing here is individualized investment, tax, or legal advice.

Written by Hazel Secco, CFP®, CDFA®. Estimated reading time: 12 minutes.

Merck is headquartered in Rahway, New Jersey, and its benefits package has a shape that most large employers gave up years ago: a 401(k) with a match, a defined benefit pension that is still open, restricted stock units for eligible employees, and a written severance plan. That is four moving parts, and the decisions that matter most are the ones where they touch. This guide explains how each piece works, what to confirm on your own benefits portal, and where the timing of a retirement or a separation changes the answer.

Key takeaways

• The Merck U.S. Savings Plan matches a partial amount of each dollar you contribute, up to a set percentage of pay, and the match vests immediately. Union-covered employees have a separate plan with a different match rate.
• Merck still has a pension. Which formula covers you depends on your hire date, and accruals moved to a cash balance formula for everyone at the start of 2020.
• RSUs vest in three equal annual installments. Retirement and involuntary separation each trigger a pro-rata rule rather than forfeiture, but only under specific conditions, and death accelerates vesting in full.
• Severance under the U.S. Separation Benefits Plan is a lump sum set by a band-and-service matrix, and it requires a signed release.
• The plan with “Employee Stock Purchase” in its name is a savings plan for collectively bargained employees, not a discounted stock purchase program.

Merck 401(k): the U.S. Savings Plan

Merck’s main 401(k) is the Merck U.S. Savings Plan. According to the plan’s Form 11-K for the year ended December 31, 2025, regular full-time, part-time, and temporary employees are eligible on or after their date of hire, and participants can contribute up to 25% of eligible compensation through a combination of before-tax and Roth contributions, up to the IRS elective deferral limit. The same filing states that participants may also contribute up to 25% of eligible compensation on an after-tax basis.

How the Merck 401(k) match works

The match is a partial match on a slice of pay, not a dollar-for-dollar match. The 11-K describes it as $0.75 for every $1.00 you contribute, up to 6% of eligible compensation, which caps the company’s contribution at 4.5% of eligible pay. Two features of that shape matter more than the rate itself.

First, the match stops at 6% of pay. Contributing more than that does not earn more company money, so the 6% line is the floor for anyone who wants the full match, and anything above it is a separate decision about tax treatment and retirement savings rate. Second, the filing states that participants are immediately vested in their own contributions and in all company matching contributions. There is no vesting cliff to plan around if you leave.

The filing says the match is calculated per pay period, and it matches catch-up contributions too. It does not mention a year-end true-up, so if you front-load contributions and reach the deferral limit early in the year, you may forfeit match for the remaining pay periods unless the plan trues it up. The filing also says nothing about in-plan Roth conversion of after-tax money. On both points, ask the plan administrator directly rather than assuming.

2026 contribution limits

The IRS sets the outer limits. For 2026, the employee deferral limit for before-tax and Roth contributions combined is $24,500. Participants age 50 and older can add a catch-up contribution of $8,000, and those ages 60 to 63 can contribute a higher catch-up of $11,250 instead. These are federal figures and apply to every 401(k), not just Merck’s. The after-tax bucket sits above the deferral limit and is governed by the overall annual additions limit and the plan’s own ceilings: 25% of eligible compensation for after-tax contributions, and a combined cap of 50% of eligible compensation across before-tax, Roth, and after-tax contributions together. The filing also notes that once you reach the deferral limit, you can elect to continue contributing on an after-tax basis for the rest of the year.

If you are covered by a collective bargaining agreement

Merck files a separate 11-K for the MSD Employee Stock Purchase and Savings Plan, which covers U.S. employees whose collective bargaining agreement provides for participation. Despite the name, this is a savings plan with a company match, not a discounted stock purchase program. Its 2025 filing describes a match of $0.65 for every $1.00 contributed, up to 6% of base pay, with a 25% combined contribution ceiling and immediate vesting. Puerto Rico employees are covered by the MSD Puerto Rico Savings & Security Plan, which the filings describe with the same $0.75 match structure as the U.S. plan. If you are not sure which plan you are in, your benefits portal will say.

Merck stock inside the 401(k)

Merck common stock is one of the investment options in the plan. For an employee who also receives RSUs and whose paycheck depends on the same company, adding Merck stock inside the 401(k) stacks a third exposure on top of the first two. That is a concentration decision, not a loyalty decision, and it deserves to be made on purpose.

The Merck pension: two formulas, one plan

Merck’s careers site confirms the company offers a defined benefit pension plan in the U.S., and the 2026 proxy statement explains how the Qualified Plan works. Its description is written in terms of U.S.-based salaried employees generally, not only executives; hourly and union employees may be covered by different arrangements. The plan has two benefit formulas, and your hire date decides which one describes your benefit.

The proxy states that the Final Average Pay formula applies only to participants who were actively employed on December 31, 2012. Under that formula, credited service could be earned through December 31, 2019, with a maximum of 35 years. After December 31, 2019, all benefits are calculated under a Cash Balance formula. Participants hired or rehired after December 31, 2012 have a benefit under the Cash Balance formula only.

In plain terms: if you joined Merck before 2013, you were in a transition period from 2013 through 2019 in which the proxy says you received the greater of the Final Average Pay and Cash Balance formulas, and since January 1, 2020 you have accrued under the Cash Balance formula only. If you joined in 2013 or later, you have a cash balance account. Vesting requires three years of service. The cash balance design works like a notional account that receives pay credits and interest credits, and the proxy notes that Cash Balance Service begins on your first day of employment and is used to determine the pay credit level.

The proxy also gives the plan’s unreduced retirement age: the earlier of age 62 with 10 years of credited service, including service under the Cash Balance formula, or age 65 with no service requirement. That line matters most for the legacy Final Average Pay benefit: the proxy says a participant who leaves at 55 or later with 10 years of credited service takes a 3% per year reduction for each year before 62, and a Final Average Pay benefit started earlier than that is actuarially reduced. A cash balance account works differently; the proxy says participants with only a Cash Balance benefit can start payment as soon as they leave. For a pre-2013 hire planning a departure in her late 50s, the unreduced age is the line to plan around. The proxy also describes a non-qualified MSD Supplemental Retirement Plan for benefits above IRS limits, which is an unfunded promise from the company rather than a trust-held asset; whether it applies to you depends on your pay level and plan terms.

Your pension statement is the only document that shows which formula applies to you, what your accrued benefit is, and what the lump sum and annuity options look like at your target date. Request it before you set a retirement date, not after.

The pension’s unreduced age, the RSU pro-rata rules below, and the severance release deadline all interact with a single retirement or separation date, and getting the order right is usually worth more than optimizing any one of them. If you would rather not work that sequence out alone, a 15-minute Align Call is a good place to start. Align is a fee-only fiduciary wealth management firm for high-net-worth women.

Merck RSUs: how vesting works and what changes when you leave

Merck grants restricted stock units to eligible employees under its incentive stock plan, and the 2026 proxy describes the executive long-term incentive program as a mix of performance share units, RSUs, and stock options. For most employees, the RSU is the piece that matters, and the terms are set by the grant agreement for each year’s award. The 2025 annual RSU Grant Terms, filed as an exhibit to Merck’s 10-K in February 2026, are the most recent public version and they describe the following structure. Each year’s terms are filed with the following February’s 10-K, so the 2026 terms are not yet public, and older grants and special retention grants have their own agreements. Check the agreement for each grant you hold.

Vesting schedule

RSUs vest in three equal installments, one-third on each of the first, second, and third anniversaries of the grant date. Dividend equivalents accrue on unvested units during the restricted period and are paid in cash through payroll when the units settle. That means each annual grant creates a three-year ladder, and after three years of grants you have units vesting every year from overlapping awards. The tax bill arrives at each vest whether or not you sell.

Retirement

The grant terms define retirement for U.S. employees as termination of employment after reaching the earliest of age 55 with at least 10 years of service, the age and service that qualifies for subsidized retiree medical coverage, or age 65 regardless of service. On retirement, the award does not vest in full. It vests pro rata: the number of units multiplied by completed months since the grant date divided by 36, less any units already vested, and the pro-rata portion is paid on the next scheduled vesting date after you leave rather than on your retirement date. The remainder is forfeited. Because the formula counts whole months, each additional month you stay adds one thirty-sixth of each open grant, so the retirement date changes how much of your most recent grants you keep, smoothly rather than in cliffs.

Involuntary separation

If you are terminated involuntarily on or after the first anniversary of the grant, the terms provide that a pro-rata portion, calculated the same way as retirement, vests on the next scheduled vesting date after your termination. The rest is forfeited. Before the first anniversary, the terms do not provide that protection. This is one of the reasons the timing of a restructuring matters so much to the value of recent grants.

Death and disability

On death, the terms state that the unvested portion of the award vests immediately, along with accrued dividend equivalents. On disability, the award continues to vest on its original schedule. The grant terms also make awards subject to recoupment: for compliance violations, the terms apply to employees in Band 600 and above, and the restatement-based clawback policy applies to Section 16 officers only, so most employees are outside both.

Your own grant agreements control. Older grants may carry different terms, and the definition of retirement in the equity plan is separate from the pension plan’s definition, so qualifying for one does not mean you qualify for the other.

Merck severance: the U.S. Separation Benefits Plan

Merck maintains a written severance plan, the Merck & Co., Inc. U.S. Separation Benefits Plan, restated effective January 1, 2019 and most recently filed with amendments through October 2024 as an exhibit to the 10-K filed in February 2025. Those amendments add and remove participating subsidiaries and do not change the payment schedules; the 2026 proxy describes the plan in the same terms. It covers regular full-time and part-time U.S. employees who are not covered by a collective bargaining agreement, unless that agreement provides for plan coverage, and it excludes anyone with a separate severance agreement. It pays only on a termination the company initiates as part of a workforce restructuring, such as a job elimination or site closing, and not if you decline a qualified alternative position or are terminated for misconduct.

The structure has four parts worth understanding before a restructuring, not after.

• A band-and-service matrix. Separation pay is weekly base salary multiplied by a number of weeks from a schedule that depends on your band level and years of continuous service, with a stated maximum. The filed plan document shows a range from a minimum of 10 weeks at the lowest band and shortest service up to a cap of 78 weeks, but the schedule in effect for you is the one in the current plan document.
• A release of claims. Benefits are paid only if you sign, and do not revoke, a release. The clock on that decision is short, and it is the point at which the equity, pension, and severance questions all have to be answered together.
• A lump sum. The plan pays separation pay as a lump sum, no later than March 15 of the year following the separation, with a six-month delay for employees classified as specified employees under Section 409A. A lump sum paid in a year when you also have RSUs vesting and a final bonus can push a large amount of income into one tax year.
• Benefits continuation. Medical, dental, and basic life insurance continuation runs for a period tied to service, from 26 weeks (under 5 years) up to 78 weeks (20 or more years) in the filed document, at active employee rates.

The plan also reduces severance for amounts you owe the company and ends benefits if you are rehired. None of this is negotiable at the moment it is offered, which is why the useful work happens before the offer exists: knowing your band, your service date, your grant dates, and your pension’s unreduced age.

Time off, parental leave, and health benefits

Merck’s careers site lists 12 company holidays a year plus 4 year-end shutdown days, paid vacation based on years of service or prior work experience for new hires, and paid parental time off of up to 12 weeks. It also lists paid time for sick leave, military duty, bereavement, jury duty, voting, and volunteering. Health, life, disability, and business travel insurance are offered, and most locations have on-site health services and fitness resources. The site describes the programs but not the detailed schedules, so treat it as a table of contents and your benefits portal as the text.

Putting it together: the decisions that interact

Most Merck benefits questions are not hard on their own. The match is a formula, the vesting schedule is a calendar, the pension has a stated unreduced age. The difficulty is that a single date, the day you leave, runs through all of them at once.

• Retiring at 58 versus 62. At 58 you may qualify for the RSU retirement definition (55 and 10 years) and keep a pro-rata share of recent grants, but if you hold a legacy Final Average Pay pension benefit you are still four years short of its unreduced age, at roughly 3% per year. That gap has a cost, and it is knowable in advance.
• The first anniversary of a grant. The RSU retirement formula is smooth, one thirty-sixth per month. The real cliff is involuntary separation: before the first anniversary of a grant the terms provide no pro-rata protection and the award is forfeited, while on or after it a pro-rata share vests. In a restructuring year, the date of your most recent grant matters.
• A severance year. Lump-sum severance, a final bonus, accelerated or pro-rata RSU vesting, and a pension lump sum can all land in the same tax year. Spreading what can be spread, and choosing what cannot, is a tax decision that has to be made before the release is signed.
• New Jersey. Merck’s headquarters is in New Jersey, and the state taxes retirement income with its own exclusion rules and treats capital gains as ordinary income. Our guide to retiring in a high-tax state covers what changes for a New Jersey resident, and Align works with clients across New Jersey from Hoboken.

Merck Employee Benefits FAQ (2026)

How much is Merck’s 401(k) match?

The Merck U.S. Savings Plan’s most recent Form 11-K describes a match of $0.75 for every $1.00 you contribute, up to 6% of eligible compensation, for a maximum company contribution of 4.5% of pay. The match vests immediately. Employees covered by a collective bargaining agreement are in a separate plan with a $0.65 match on the same 6% of base pay. Confirm the current rate on your benefits portal.

Does Merck still have a pension?

Yes. Merck’s careers site lists a defined benefit pension plan in the U.S., and the 2026 proxy statement describes a qualified plan with a Final Average Pay formula for people employed on December 31, 2012, whose service accruals ended December 31, 2019, and a Cash Balance formula for all accruals after that and for anyone hired from 2013 on. The unreduced retirement age is the earlier of 62 with 10 years of service or 65.

How do Merck RSUs vest?

Under the 2025 grant terms, RSUs vest one-third per year on the first, second, and third anniversaries of the grant date, with dividend equivalents accrued and paid in cash at settlement.

What happens to Merck RSUs if I retire or am laid off?

Retirement, defined as at least age 55 with 10 years of service, retiree-medical eligibility, or age 65, triggers pro-rata vesting based on completed months since the grant date out of 36. Involuntary termination on or after the first anniversary of a grant triggers the same pro-rata calculation, paid on the next scheduled vest date. Before the first anniversary, unvested units are forfeited. Death vests the award in full; disability lets it continue on schedule.

Does Merck have an employee stock purchase plan?

Not in the usual sense. The plan Merck files under the name MSD Employee Stock Purchase and Savings Plan is a 401(k)-style savings plan for collectively bargained employees, with a company match and Merck stock as one investment option. Its filing describes no purchase discount. The main way most employees acquire Merck stock is through RSUs and through the stock fund inside the savings plan.

Can I do a mega backdoor Roth at Merck?

The first ingredient is there: the U.S. Savings Plan’s filing says participants may contribute up to 25% of eligible compensation on an after-tax basis. The second ingredient is less clear: the filing confirms that in-service distributions exist under the plan’s provisions, but it does not say whether after-tax balances specifically can be withdrawn while employed, and it says nothing about in-plan Roth conversion. Ask the plan administrator whether in-plan Roth conversion or in-service withdrawal of after-tax contributions is permitted before you count on the strategy.

Sources

• Merck U.S. Savings Plan, Form 11-K for the year ended December 31, 2025 (filed June 24, 2026): eligibility, contribution limits, match formula, vesting, after-tax contributions.
• MSD Employee Stock Purchase and Savings Plan, Form 11-K for 2025: union plan match and eligibility.
• MSD Puerto Rico Savings & Security Plan, Form 11-K for 2025.
• Merck & Co., Inc. 2026 Proxy Statement: Pension Benefits narrative (Final Average Pay and Cash Balance formulas, unreduced retirement age, Supplemental Retirement Plan) and long-term incentive program structure.
• Merck & Co., Inc. 2025 Annual Restricted Stock Unit Grant Terms, Exhibit 10.27 to the Form 10-K filed February 24, 2026: vesting, retirement, involuntary separation, death, disability, dividend equivalents, recoupment.
• Merck & Co., Inc. U.S. Separation Benefits Plan, amended and restated as of January 1, 2019 with amendments through October 2024, Exhibit 10.13 to the Form 10-K filed February 25, 2025.
• IRS Notice 2025-67: 2026 deferral limit ($24,500) and catch-up limits ($8,000; $11,250 for ages 60 to 63).
• Merck Careers: Compensation and Benefits: pension, 401(k), time off, parental leave, health programs.

If you are a Merck employee within a few years of a retirement or separation date and want the pension, RSU, and severance decisions sequenced before the date is set, schedule a 15-minute Align Call to discuss your situation and see whether working together may be a good fit.