Pension Calculator

The Pension Formula — Three Numbers Determine Everything

Defined-benefit pensions calculate your annual benefit using a remarkably simple formula: annual pension = years of service × benefit multiplier × final average salary. Knowing each component is what makes the difference between an estimate and a real plan.

Why pensions are disappearing

In 1980, 38% of private-sector workers had a DB pension. By 2024, that figure was just 11%. Most disappearing pensions were replaced with 401(k)s — shifting investment risk and longevity risk from employer to employee. Government workers retain DB pensions at higher rates (60%+ have one). If you have a private-sector DB pension, you're in a shrinking minority — and protecting it is worth real effort.

DB pension prevalence per BLS Employee Benefits Survey 2024. Multiplier and formula data from OPM for federal plans. Private DB plan ranges from PBGC annual report.

Early Retirement Reduction — How Each Year Costs You

Most pension plans have a "Normal Retirement Age" (NRA) — usually 65 — where you get 100% of your earned benefit. Retire earlier and your benefit is reduced, typically 5-7% per year before NRA. The reduction is permanent for life. Understanding the numerical impact is critical.

"Rule of 85" / "Rule of 90" calculation

Many plans (especially public sector) let you retire with full benefit if your age + years of service ≥ a threshold. Rule of 85: age + service ≥ 85. Rule of 90: ≥ 90. Example: enter the workforce at 25, work continuously, you hit Rule of 85 at age 55 (55 + 30 = 85). Some plans use Rule of 80 (more generous), some use 90 (less generous). Read your SPD to find your specific rule.

The "actuarial equivalent" trap

Some plans don't use a flat reduction percentage. They use "actuarial equivalent" calculations based on life expectancy tables. The result is similar (longer payout period = lower monthly check) but the math is opaque. Always request a written benefit calculation from your plan administrator at multiple potential retirement ages before deciding when to retire — you may be giving up more than you think.

FERS reduction formulas per OPM FERS handbook. Rule of 85 details vary by plan — see Summary Plan Description (SPD) provided by HR. Actuarial equivalent calculations governed by IRC §417(e) and plan-specific assumptions.

Spousal Election — Federal Law Protects Your Spouse Whether You Want To Or Not

If you're married, federal law (ERISA / IRC §417) requires DB pension plans to default to a Joint and Survivor Annuity with at least 50% survivor benefit — unless your spouse signs a notarized waiver. The single-life annuity (highest monthly payment) requires explicit spousal consent. Picking single-life without a waiver is illegal.

Federal protections summary

• QPSA (Qualified Pre-Retirement Survivor Annuity): If you die BEFORE retiring with at least 1 year of marriage, your spouse gets a survivor benefit automatically. Plans must offer it.
• QJSA (Qualified Joint and Survivor Annuity): Default form for married participants. At least 50% survivor benefit required.
• Spousal consent rules: Election of any non-QJSA form requires written, notarized spousal consent on plan-provided forms (not generic forms).
• QDRO (Qualified Domestic Relations Order): In divorce, ex-spouse may be entitled to a portion via QDRO. Consult attorney early.

QJSA / QPSA / spousal consent rules per IRC §417 and ERISA §205. Spousal consent must be witnessed by plan rep or notary. Pension Max strategy critically analyzed in Kitces and Mike Piper.

PBGC — What Happens If Your Plan Fails?

The Pension Benefit Guaranty Corporation (PBGC) is a federal agency that insures most private-sector DB pension plans. If your plan terminates without enough money to pay promised benefits, PBGC steps in — but with caps. Federal, military, church, state, and local government plans are NOT covered by PBGC.

Multi-employer plans — different (lower) caps

Multi-employer plans (typically union plans) have a separate, lower PBGC guarantee: ~$12,870 per year for a worker with 30 years of service in 2026. Far below the $87K single-employer cap. This is why distressed multi-employer plan terminations have historically devastated retirees. SECURE 2.0 and the American Rescue Plan provided emergency funding to many distressed multi-employer plans.

How likely is your plan to fail?

• Check your plan's funding ratio in the annual Form 5500 (publicly available at DOL.gov). 80%+ funded = healthy; below 60% = at risk.
• Check the plan sponsor's financial health. A profitable sponsor with a 60%-funded plan is safer than a struggling sponsor with an 80%-funded plan.
• If your plan is well-funded AND sponsor is healthy, PBGC concerns are mostly academic. Worry only if both flags are red.

2026 PBGC maximum guarantee per PBGC.gov 2026 Premium Filings. Multi-employer cap per ERISA §4022A. Plan funding data filed annually on Form 5500 with DOL.

Lump Sum vs Lifetime Income — The Once-In-A-Lifetime Decision

If your plan offers a lump-sum buyout option, you face a once-in-a-lifetime decision: take guaranteed lifetime income, or take the cash and manage it yourself. The right answer depends on your health, investment skill, other income sources, and risk tolerance. This decision cannot be reversed.

Lump sum calculations governed by IRC §417(e) using PBGC-prescribed rates. Recent years have seen rising lump-sum offers as Treasury yields rose. Kitces analysis consistently finds lifetime annuity superior for healthy retirees due to mortality credits absent in lump sum.