Coast FIRE Calculator with Pension & Social Security (Free)
Your pension is a retirement income stream. See how much less you actually need to save.
$329,443→
$42,613
With Pension
Your Information
How Your Pension Reduces Your Target
-$625,000
-$463,316
2-year gap
Age 65 to 65 • Need $50,000 bridge fund
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For Couples
Calculate with dual incomes and joint expenses
UK / Canada / India
Tax rules and currency adjustments for Canada, India, and the UK
How to Calculate
Step-by-step formula with research sources
How Pension Affects Coast FIRE Math
The 4% Rule in Reverse
The 4% rule says you can safely withdraw 4% of your nest egg each year in retirement. Now flip it: if you have $10,000/year in guaranteed pension income, that replaces $250,000 of required savings ($10K ÷ 4% = $250K). A $30K pension eliminates $750K from your savings target. This single insight can move your Coast FIRE date years closer.
Gap Years: The Bridge Strategy
If you retire at 55 but your pension starts at 65, you face 10 "gap years" that need funding. Three proven strategies: (1) Work part-time earning $20-30K/year during the gap — this alone can cover most expenses. (2) Build a dedicated bridge fund of 3-5 years of expenses. (3) Delay full coasting until pension kicks in. Our calculator models these gap years explicitly so you can plan with confidence.
COLA Considerations
Cost-of-Living Adjustments (COLA) make or break a pension's long-term value. Federal pensions (FERS) and Social Security include automatic COLA — treat these at full face value. Many state and corporate pensions lack COLA, meaning $40K today buys only $30K of goods in 10 years at 3% inflation. For non-COLA pensions, reduce your estimate by 2-3% per year until benefits begin.
Key Pension Planning Insights
Critical factors that affect how your pension and Social Security interact with Coast FIRE.
WEP & GPO: The Hidden Pension Tax
If you have both a government pension and Social Security, the Windfall Elimination Provision (WEP) may reduce your SS benefit by up to $587/month (2024 limit). The Government Pension Offset (GPO) can eliminate survivor benefits entirely — reducing your expected SS by two-thirds of your pension amount. These provisions affect teachers, firefighters, police officers, and other public employees in 15 states that don't participate in Social Security.
Pension vs. Annuity: Know the Difference
A pension is an employer-funded defined benefit plan — your employer bears the investment risk. An annuity is a product you purchase from an insurance company. For Coast FIRE calculations, treat both as guaranteed income streams, but with a key difference: pensions often include survivor benefits and sometimes COLA, while annuities rarely do. If converting a lump-sum pension offer to an annuity, the breakeven point is typically 12-15 years of payments.
Optimal Social Security Claiming Age
Every year you delay Social Security past 62 increases your benefit by approximately 6-8%. Claiming at 62 gives you 70% of your full benefit; at 67 (full retirement age for most) you get 100%; at 70, you receive 124%. The breakeven point between claiming early (62) vs. full retirement age (67) is around age 78-80. If you're Coast FIRE'd and have other income sources, delaying to 70 is mathematically optimal for most people.
Common Pension Scenarios
Teacher's Pension + Social Security
Military Pension + TSP
Corporate Pension + 401k
How to Use This Calculator
Add Your Pension Details
Toggle "Include Pension" and enter your expected annual pension amount and the age it begins. Check your most recent pension statement or use your employer's estimate tool for accuracy.
Add Social Security
Toggle "Include Social Security" and enter your expected annual benefit. Use the SSA.gov estimator for your projected amount. Choose when you plan to start claiming (62-70).
Review the Before & After
The impact section shows your Coast FIRE target with and without pension income. See exactly how much less you need to save — most people are surprised by how much pensions reduce their target.
Plan for Gap Years
If your pension starts after your target retirement age, the calculator highlights your "gap years." Review the income timeline to ensure you have coverage during this transition period.
Frequently Asked Questions
Your pension is guaranteed retirement income, which means you need less from investments. For every $10,000/year in pension income, subtract $250,000 from your required nest egg (4% rule reversed: $10K ÷ 4% = $250K). A $25K pension = $625K less to save.
Yes, but conservatively. Most financial planners recommend assuming SS will provide 75-80% of promised benefits for younger workers. Our calculator uses your full estimate—reduce your expected amount if you're under 50 and want extra safety margin.
The calculator shows your "gap years"—the period between when you could Coast FIRE and when pension starts. Options: (1) Part-time work during the gap, (2) Build a small bridge fund, (3) Delay full coasting until pension kicks in. We show the income needed during this gap.
Check if your pension has COLA (Cost-of-Living Adjustment). With COLA: use the full amount. Without COLA: your pension's purchasing power decreases over time. Consider reducing non-COLA pensions by 2-3% per year of delay in your calculations.
The Windfall Elimination Provision (WEP) reduces Social Security benefits for people who also receive a government pension from work not covered by SS. It can reduce your SS benefit by up to $587/month. If you're a teacher, firefighter, or public employee in one of the 15 affected states, reduce your SS estimate by 40-60% when planning your Coast FIRE number.
Compare the lump sum against the present value of annual payments. A $25K/year pension is equivalent to $625K at a 4% withdrawal rate. If the lump sum offer exceeds this, taking it gives you more flexibility. If it's less, the annual payment is typically better. The breakeven for most lump-sum-to-annuity decisions is 12-15 years of payments.
Use our For Couples Calculator and add both partners' pension incomes manually, or calculate separately and combine. Example: Partner 1 pension $20K + Partner 2 SS $18K = $38K/year combined retirement income, reducing your combined target by $950K.
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May you reach the shore soon 🌅