Pension vs 401(k) Calculator: Which Pays More?

Why this question is harder than it looks

The pension vs 401(k) comparison trips people up because the two products don't speak the same language. A pension quotes monthly income. A 401(k) quotes a balance. Comparing $2,400 per month to $580,000 in an account requires a conversion, and that conversion depends on an assumption (the withdrawal rate) that can shift the answer considerably.

At a 4% withdrawal rate, $580,000 generates $1,933 per month. The $2,400 pension wins by $467 per month, or about $5,600 per year. At a 3% withdrawal rate (appropriate for a 35-year retirement), $580,000 generates $1,450 per month and the pension wins by nearly $1,000 per month. At a 5% rate (aggressive, possibly unsustainable), the 401(k) generates $2,417 and essentially ties. The withdrawal rate assumption alone swings the result by hundreds of dollars per month.

The right approach: convert both to the same unit. Use the pension monthly income as the target, then calculate the 401(k) balance required to match it at your chosen withdrawal rate. That required balance is the benchmark. If your projected 401(k) at retirement exceeds it, the 401(k) wins on income. If it falls short, the pension wins.

How to value a defined benefit pension correctly

Most people underestimate pension value because the monthly check looks modest. A $2,400 monthly pension at age 65, paid for 22 years (to age 87), totals $633,600 in nominal dollars. With a 2% COLA over that same 22 years, the total reaches $787,000. That's before accounting for the fact that a pension is guaranteed, requires no investment decisions, and cannot be depleted by a bad market.

The actuarial way to value a pension is to calculate its present value, discounted at a rate that reflects what you could earn by investing the equivalent lump sum. A $2,400 monthly pension for 22 years, discounted at 5%, has a present value of roughly $385,000. At a 4% discount rate, that same payment stream is worth about $430,000. The pension's present value is highly sensitive to the discount rate, which is why actuaries spend careers arguing about it and why the IRS prescribes specific rates for pension funding calculations.

For a practical comparison, the simplest honest method is the one this calculator uses: divide the annual pension benefit by the withdrawal rate to find the equivalent account balance. If your pension pays $28,800 per year and you'd withdraw at 4%, you'd need $720,000 in a 401(k) to match it. That's the benchmark your 401(k) needs to hit.

Sequence of returns risk: the 401(k)'s hidden vulnerability

The average return of a 401(k) over a 30-year accumulation period matters. The sequence of those returns in the first decade of retirement matters much more.

If you retire in 2000 with $1 million in a stock-heavy 401(k) and start withdrawing 4% annually, the 2000-2002 bear market draws down your balance while you're still withdrawing. By the time the market recovers, you have fewer shares to recover with. A Vanguard study found that the difference between retiring in a good market year versus a bad market year can result in a 30-50% difference in terminal portfolio value over a 30-year retirement, even if the average annual returns are identical.

Pensions have no sequence-of-returns exposure. The monthly check arrives regardless of what the S&P 500 did last quarter. That certainty has real economic value that doesn't show up in a simple income comparison, and it's worth more to someone who retires into a downturn than to someone who retires into a bull market.

PBGC protection: what the pension guarantee actually covers

The Pension Benefit Guaranty Corporation insures most private-sector defined benefit plans. If your employer's plan fails or terminates, the PBGC takes over and pays benefits up to a statutory maximum. For 2025, that maximum is about $7,285 per month ($87,420 per year) for a 65-year-old retiree on a single-life annuity. If your pension benefit is below that ceiling, employer insolvency is not a meaningful risk for you.

Pensions above the PBGC cap are partially exposed. If your employer is in a distressed industry or your plan is significantly underfunded (check your annual funding notice), the excess above the cap is at risk in a bankruptcy. Government pensions, including federal FERS and CSRS, military retirement, and most state teacher plans, are not insured by the PBGC but are backed by government taxing authority, which makes insolvency a different kind of risk than a private-sector employer.

A 401(k) carries no employer credit risk. It's held in a trust legally separate from the employer and protected by ERISA. SIPC covers brokerage accounts up to $500,000. Even in employer bankruptcy, the 401(k) balance is yours.

Longevity risk: who benefits from each structure

A pension is longevity insurance. The longer you live past the break-even age, the more valuable it becomes relative to any finite pool of invested assets. A 401(k), withdrawn at 4% per year, is designed to last 30 years with high probability, based on historical data. At 35 or 40 years, the failure rate climbs. At a 3.5% withdrawal rate, the probability of portfolio survival improves meaningfully, but the monthly income shrinks.

If you have strong family longevity (parents and grandparents in their late 80s or 90s) and plan to retire early, the pension's lifetime guarantee becomes harder to replicate from a 401(k). The cost of buying a private annuity to provide equivalent income at age 65 is roughly 20-25 times the annual benefit, a number that puts most pensions well above the 401(k) balances people actually accumulate.

Survivor benefits: how each handles a spouse

A pension with a joint-and-survivor option pays a reduced monthly amount to you while alive, then continues paying a percentage (50%, 75%, or 100%) to your spouse after your death. The cost of that survivor coverage comes out of your monthly benefit, typically 5-11% depending on the survivor percentage and your ages.

A 401(k) balance passes to designated beneficiaries at death. If you die at 70 with $400,000 remaining, your spouse inherits the full account and can roll it to their own IRA. There's no actuarial haircut taken from your withdrawals while you're alive. For a couple where one spouse has a much longer expected lifespan, the 401(k)'s inheritance feature can be more valuable than the pension's survivor annuity.

The pension's survivor provision matters most when the non-pensioned spouse has no independent retirement income and couldn't manage a large investment portfolio alone after the pension holder's death. In that scenario, the automatic continuation of income is genuinely protective in a way that a lump sum inheritance isn't.

What to actually do with this comparison

If you're choosing between two jobs, the pension vs 401(k) question is really about how long you'll stay and how much the employer match improves the 401(k). A 20% employer match turns a 5% employee contribution into a 6% total contribution rate, which matters. A 100% match up to 4% is worth $3,400 per year on an $85,000 salary. Over 20 years at 7% return, that's roughly $160,000 in retirement assets from the match alone.

Pensions are tenure plays. The benefit formula rewards long service aggressively. At a 1.5% multiplier, 10 years of service produces a benefit worth 15% of final salary. 25 years produces 37.5%. The math gets dramatically better as you accumulate service, which is why early departures are so costly. If you plan to leave in 8 years, the pension almost certainly loses to a portable 401(k) with a reasonable match.