Massachusetts Pension Calculator
Massachusetts State Employees' Retirement System (MSERS) covers state employees and employees of certain other public entities (teachers use MTRS; cities, towns and counties run their own local retirement systems). This page explains the benefit formula, lump sum options, and how to calculate your estimated pension.
Official system website: mass.gov/msrb
Avg. monthly benefit
$3,590
Vesting period
10 years
Lump sum option
Not available
Massachusetts State Employees' Retirement System: How the pension works
Benefit formula
Age factor x years of creditable service x average salary (highest 3 consecutive years if hired before April 2, 2012; highest 5 if hired after), capped at 80% of that average. The age factor depends on age at retirement, job group and hire date
The formula above reflects the base structure. Actual benefits depend on your membership tier, bargaining unit, hire date, and whether any additional credits apply. Members hired after benefit restructuring (which happened in most states between 2008 and 2014) are often in less generous tiers than longer-tenured employees.
If you're unsure which tier you're in, your annual benefit statement from MSERS will show your projected benefit and current accrued amount. Compare those figures to the formula to back into your effective multiplier.
Covered employees
Massachusetts State Employees' Retirement System covers state employees and employees of certain other public entities (teachers use MTRS; cities, towns and counties run their own local retirement systems). If you're a Massachusetts public employee and aren't sure whether you're in MSERS or a separate retirement system (teachers, police, fire, and judges sometimes have different plans), check your pay stub: if a pension contribution is being deducted and forwarded to MSERS, you're in this system.
Vesting and early separation
You need 10 years of creditable service to vest. Before vesting, leaving public employment generally gets you back only your own employee contributions, if your plan required any. Once vested, you're entitled to a future pension benefit even if you leave before reaching retirement age, though you may need to wait until a specific age to start receiving payments.
Leaving before vesting and taking the contribution refund is usually a mistake unless you have a specific cash need. That money grew tax-deferred, and forfeiting the pension benefit means you gave up the employer-funded portion entirely. If you're close to the vesting date, staying is almost always worth it.
Lump sum option
MSERS pays a monthly retirement allowance, made up of an annuity from the member's own contributions and interest plus a pension, with no lump sum option. Members with fewer than ten years who resign get their contributions back plus 3% interest; members with more than ten years, or who are involuntarily terminated, get their contributions plus regular interest. Members hired before April 2, 2012 in Group 1 can retire at 55 with ten years or at any age with twenty; later hires must be at least 60 with ten years.
Since MSERS doesn't pay a lump sum, the choices that move your numbers are when you retire and which survivor option you pick. The calculator below puts a present value on your estimated monthly benefit, in today's dollars.
What the present value calculation tells you
MSERS won't pay this amount out, but the present value still does three jobs. It lets you compare the pension with alternatives, such as leaving for a private-sector job with a 401(k). It shows what a refund of contributions would cost you once you're vested. And it puts a number on the retirement income you've built, which feeds Social Security timing and IRA drawdown decisions.
The IRS 417(e) formula uses three segment rates to discount future pension payments back to today. At current rates (4.07%, 5.15%, 6.01% for 2026), a $2,500/month pension starting at 65 is worth about $369,000 as a single sum under the IRS 2026 mortality table. Public plans don't have to offer that amount, and most don't offer a lump sum at all.
Coordinating your MSERS pension with Social Security
Social Security coverage depends on the position. Some state and local government jobs are outside Social Security, and those jobs don't earn Social Security benefits. Check your pay stub: if no Social Security (OASDI) tax is withheld, that job probably isn't covered. Medicare tax on its own doesn't mean the job is covered.
If you have private-sector work history where you did pay into Social Security, the Windfall Elimination Provision (WEP) and Government Pension Offset (GPO) previously reduced Social Security benefits for workers with government pensions. Both were repealed by the Social Security Fairness Act of 2023, signed January 5, 2025, effective for benefits payable after December 2023. SSA finished paying the retroactive amounts in 2025. If you think yours is missing, contact SSA.
If your public employment included Social Security contributions, which varies by state and by position, then Social Security timing still matters, and the break-even analysis is worth running separately. The Social Security break-even calculator on this site handles that calculation.
Disclaimer: This page reflects publicly available information about Massachusetts State Employees' Retirement System. Benefit formulas, vesting rules, and lump sum options change periodically through legislation and collective bargaining. Verify all details at mass.gov/msrb or by contacting MSERS directly.
Frequently asked questions
How is an MSERS pension calculated?
Massachusetts State Employees' Retirement System uses this formula: Age factor x years of creditable service x average salary (highest 3 consecutive years if hired before April 2, 2012; highest 5 if hired after), capped at 80% of that average. The age factor depends on age at retirement, job group and hire date. The average MSERS retiree receives about $3,590 per month, though amounts vary widely based on salary and years of service.
How many years do I need to vest in MSERS?
You need 10 years of creditable service to vest in Massachusetts State Employees' Retirement System. Before that point, leaving means you're entitled only to your own contributions back, with no pension benefit.
Does MSERS offer a lump sum?
MSERS pays a monthly retirement allowance, made up of an annuity from the member's own contributions and interest plus a pension, with no lump sum option. Members with fewer than ten years who resign get their contributions back plus 3% interest; members with more than ten years, or who are involuntarily terminated, get their contributions plus regular interest. Members hired before April 2, 2012 in Group 1 can retire at 55 with ten years or at any age with twenty; later hires must be at least 60 with ten years.
Can I withdraw my MSERS contributions if I leave?
Before vesting, you can typically withdraw your employee contributions if you separate from Massachusetts public employment. This forfeits any future pension benefit. After vesting, you can still withdraw contributions in some plans, but doing so usually means giving up the pension rights you've earned.
Where can I find my MSERS benefit estimate?
Log in to the member portal at mass.gov/msrb. Most systems offer online calculators and annual statements showing your current accrued benefit and projections at various retirement ages. You can also call MSERS directly for a personalized benefit estimate.