Updated October 30, 2026. Quick answer: The Public Employees’ Retirement System of Mississippi (PERS) pays a Tier 4 member 2% of average compensation for each year of creditable service up to 30, plus 2.5% for each year over 30. Computed for 30 years and $60,000 of average compensation, that is $36,000 a year (computed), or $3,000 a month (computed). Tier 4 is the group that joined from July 1, 2011 through February 28, 2026; Tiers 1 to 3 and the Tier 5 hybrid plan have other rules and are not priced here. A Tier 4 member needs 8 years to be vested and can retire unreduced with 30 years at any age. Enter your own numbers below; the figure is the Maximum Retirement Allowance, before any payment option.
Calculate your PERS Tier 4 benefit
This page applies the benefit formula in the PERS Member Handbook to your service, age and average compensation. It runs on this page and sends nothing anywhere. It covers Tier 4, which the handbook (“This book was revised November 8, 2024.”) defines by hire date as “July 1, 2011, or later”. PERS has since made its hybrid plan mandatory for a later group: “Mandatory for those who become members of PERS on or after March 1, 2026”. This page therefore treats Tier 4 as a member who joined PERS from July 1, 2011 through February 28, 2026. Enter your creditable service from your PERS record, whole years and months, the whole age you will have reached on your retirement date, and your average compensation as an annual amount.
For a decision, use PERS itself: its member account prices your exact retirement date and payment option at pers.ms.gov. This page is the published formula, shown so you can see the arithmetic.
The formula, as PERS prints it
The handbook gives the formula in words: “The formula for calculating service retirement benefits is 2 percent of your average compensation multiplied by creditable service years up to 25 or 30 (based on your Retirement Tier). Add to that any additional years multiplied by 2.5 percent of your average compensation.” For Tier 4 the handbook’s tier table gives the limit as 30: “Tier 4 July 1, 2011, or later 8 years 30 years at any age or age 60 and vested”. The table row continues with the same formula, “2 percent per year for up to 30 years, plus 2.5 percent per year for each year over 30”. The result is a yearly amount; this page also shows it as a monthly amount (twelve months).
The handbook’s equation asks for service in years. This page carries your extra months as twelfths of a year, a choice the handbook does not state; enter whole years if you want to match the PERS worksheet exactly.
Worked example, calculated for 30 years and $60,000 of average compensation: 2% x 30 = 60% of $60,000 = $36,000 a year (computed), $3,000 a month (computed). With 35 years: (2% x 30) + (2.5% x 5) = 72.5% of $60,000 = $43,500 a year (computed), $3,625 a month (computed).
What the formula gives at each length of service, at $60,000 of average compensation, for a member who meets a test for an unreduced benefit:
| Years of service | Share of average | Annual benefit | Monthly benefit |
|---|---|---|---|
| 8 | 16% (computed) | $9,600 (computed) | $800 (computed) |
| 10 | 20% (computed) | $12,000 (computed) | $1,000 (computed) |
| 15 | 30% (computed) | $18,000 (computed) | $1,500 (computed) |
| 20 | 40% (computed) | $24,000 (computed) | $2,000 (computed) |
| 25 | 50% (computed) | $30,000 (computed) | $2,500 (computed) |
| 30 | 60% (computed) | $36,000 (computed) | $3,000 (computed) |
| 35 | 72.5% (computed) | $43,500 (computed) | $3,625 (computed) |
| 40 | 85% (computed) | $51,000 (computed) | $4,250 (computed) |
What average compensation is
It is not your final salary. The handbook says: “Average compensation is calculated using your four highest years of salary and payment of up to 240 hours of leave. The years do not have to be consecutive, but they do have to be the equivalent of not more than 48 months of earned compensation.” It also limits a late raise: “Salary increases in excess of 8 percent per year received during the final 24 months before retirement are excluded in computing benefits unless authorized by the Mississippi Legislature or Mississippi State Personnel Board or are a result of a change in the position held or services rendered.” The calculator takes the figure PERS shows for your four highest years, so it does not run either rule.
When you can retire unreduced
The tier table sets the Tier 4 tests: 8 years to be vested, and “30 years at any age or age 60 and vested”. The row then ties the reduction to two shortfalls: “with an actuarial reduction for each year of creditable service below 30 or for each year in age below age 65, whichever is less”. The handbook repeats it as a note: “An actuarial reduction applies under Tier 4 if you retire before age 65 with less than 30 years of creditable service.”.
Two cases follow with no judgment. A member with 30 years of service has no year of service below 30, so nothing is reduced at any age. A member who is 65 or older has no year of age below 65, so nothing is reduced with 8 or more years. The calculator prints an unreduced benefit in those two cases (the age 65 case is derived from the handbook’s rule, not a separate sentence of it).
Worked example, calculated for 20 years and $60,000 of average compensation, a member who retires at 65: 2% x 20 = 40% of $60,000 = $24,000 a year (computed), $2,000 a month (computed).
Retiring from 60 with under 30 years: the reduction
A member who is 60 or older and vested but under 65, with fewer than 30 years, retires with an actuarial reduction. The handbook says an actuarial reduction applies and prints no rate or factor table in the pages this calculator reads, so the calculator shows the formula amount before the reduction and says that a reduction applies. Worked example: 25 years, age 62 and $60,000 of average compensation gives $30,000 a year before the reduction (computed); the reduced benefit is not stated here. Ask PERS for that figure.
A member with fewer than 8 years is not vested, and a member under 60 with fewer than 30 years cannot retire on these tests; the calculator says so. A member with 7 years who is 65 is below the 8-year vesting line.
What to do next
1. Get PERS’s own number. The member account prices your exact retirement date, reduction and payment option; this page is the printed formula.
2. The rest of the PERS decisions. Payment options, the Partial Lump Sum Option and the refund are on the Mississippi PERS retirement decisions page, the annual adjustment is on the Mississippi PERS COLA page, and the rules for working after you retire are on the PERS returning to work page.
3. Tax. Mississippi’s treatment of pension income is on the Mississippi pension tax page. Federal tax applies too: “The taxable part of your pension or annuity payments is generally subject to federal income tax withholding.” The withholding form is described on the IRS page for Form W-4P: “so your payer can withhold the correct amount of federal income tax from your periodic pension, annuity”.
Where this calculator stops
It prices one thing: the Maximum Retirement Allowance of a Tier 4 member retiring from service. Tiers 1 to 3 have other limits and tests, and Tier 5 members use a different plan; those are different calculations. It leaves out the payment options and the Partial Lump Sum Option, disability retirement, the cost-of-living adjustment, purchased or repaid service and its cost (the pension buyback calculator covers purchases in general), and the actuarial reduction for a member who retires before 65 with under 30 years. It reads service, age and compensation as you enter them.
How it was checked: a second, independent engine (exact fractions, with the 2%, the 2.5%, the limit of 30 years, the 8-year vesting and the ages read from the archived handbook text) agreed with this page’s engine on 240,000 random combinations of service, age and pay, and the shipped script was driven in a browser on a grid of cases against both. The rules were read from the PERS Member Handbook revised November 8, 2024, and the PERS Tier 5 page.
Common mistakes
- Entering a monthly salary. The handbook’s formula uses average compensation as an annual amount.
- Using your final salary. PERS averages your four highest years of salary, which need not be consecutive.
- Using the limit from an earlier tier. Tier 4 pays 2% only up to 30 years and 2.5% after that.
- Expecting an unreduced benefit at 60 with 8 years. A Tier 4 member who retires before 65 with under 30 years has an actuarial reduction.
Related: Mississippi PERS retirement decisions, public pension decisions by system, single life versus joint and survivor, and Mississippi retirement taxes.
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Answer againSources
- Public Employees’ Retirement System of Mississippi, PERS Member Handbook (revised November 8, 2024): https://www.pers.ms.gov/Content/Handbooks/Member_Handbook.pdf
- Public Employees’ Retirement System of Mississippi, PERS Hybrid Retirement Plan – Tier 5 page: https://www.pers.ms.gov/Tier5
- IRS, Topic no. 410, Pensions and annuities: https://www.irs.gov/taxtopics/tc410
- IRS, About Form W-4P, Withholding Certificate for Pension or Annuity Payments: https://www.irs.gov/forms-pubs/about-form-w-4p
Read from the system publications linked above on October 30, 2026. General information, not legal or tax advice, and not an estimate from the retirement system. Your own facts decide the outcome, and your retirement system, your plan administrator or a benefits advisor is the right place to confirm anything consequential.