Social Security Bridge Calculator
Calculate the portfolio bridge fund needed to delay Social Security from age 62 or full retirement age to age 70 — capturing the maximum 32% delayed retirement credit. See lifetime extra income and break-even age, free and instant.
The 8% Annual Bonus for Delaying Social Security
Per the SSA delayed retirement credit rules, every year you delay claiming Social Security past your full retirement age (FRA) increases your benefit by 8% per year — up to age 70. For someone with FRA of 67, claiming at 70 produces 124% of the FRA benefit (3 years × 8%), or 132% if compared to claiming at age 62 (a 76.7% reduction from FRA). On a $2,800 FRA monthly benefit, claiming at 62 produces about $1,960/month, claiming at 67 produces $2,800/month, and claiming at 70 produces about $3,472/month — a $1,512/month difference between the earliest and latest claim ages, indexed for inflation through annual cost-of-living adjustments. For early-retired FIRE practitioners, this bonus is worth six-figures over a 25-year retirement.
Why a Bridge Fund Beats Claiming Early
The Social Security bridge strategy uses portfolio withdrawals to cover spending needs from your retirement age (often 55-65) until age 70, then switches to the maximized Social Security benefit. The bridge fund acts like a self-funded annuity, letting your Social Security benefit grow by 8% per year guaranteed and inflation-protected. Compare this to commercial annuities that yield 4-6% — Social Security delay is mathematically the cheapest annuity available. Per Boston College Center for Retirement Research, 96% of singles who live to average life expectancy (84 men, 87 women) collect more lifetime income by delaying Social Security to 70 than by claiming early — the break-even age typically falls between 78-82 depending on COLAs and discount rate assumptions.
Bridge Fund Sizing for FIRE Retirees in 2026
Use this calculator to size the bridge fund. Inputs needed: your Primary Insurance Amount (PIA) at FRA from ssa.gov/myaccount, your retirement age (when employment income stops), and your annual spending. The calculator computes the present value of bridge withdrawals from retirement age to 70 at your assumed real (after-inflation) return. Example: a 55-year-old FIRE retiree spending $60,000/year needs a roughly $720,000 bridge fund to delay Social Security to 70, assuming a 3% real return. This is in addition to their main FIRE portfolio that funds spending after age 70 net of Social Security. Last updated May 2026.
When NOT to Use the Bridge Strategy
Three scenarios where claiming earlier than 70 may be better. (1) Severe health problems with shortened life expectancy — if you expect to live to 75 or earlier, claiming at FRA or even 62 produces more lifetime income. (2) Lower-earning spouse — the lower-earning spouse should typically claim at 62 while the higher earner delays to 70 (the survivor inherits the larger benefit). (3) Significant pension income — if you have a pension or significant guaranteed income covering spending, the marginal value of larger Social Security drops. Per the SSA Office of Retirement Policy, single individuals without health concerns who plan to live to average life expectancy should plan to delay to 70. Married couples should run a more nuanced analysis combining both spouses' work histories and health.
Frequently Asked Questions
How much does delaying Social Security to 70 increase the benefit?
Per SSA rules, delaying past your full retirement age earns 8% per year in delayed retirement credits, capped at age 70. For FRA of 67, claiming at 70 produces 124% of the FRA benefit. Claiming at 62 reduces the benefit to about 70% of FRA, so the gap between earliest and latest claiming is roughly 76% more monthly income at 70 vs 62.
What is a Social Security bridge fund?
A bridge fund is a portfolio of bonds, CDs, and conservative investments specifically earmarked to cover living expenses from your retirement date until age 70, allowing your Social Security benefit to grow uninterrupted. Bridge funds are common in FIRE (Financial Independence Retire Early) plans for retirees aged 50-65.
When does the Social Security delay strategy break even?
For most retirees, delaying from age 62 to 70 breaks even around age 80-82. Single individuals without health concerns who expect to live past 80 collect more lifetime income by delaying. The break-even is later (age 84+) when comparing FRA to age 70 due to the smaller percentage gain.
Should both spouses delay Social Security?
Usually no. The standard recommendation: the higher-earning spouse delays to 70 to maximize the survivor benefit, while the lower-earning spouse claims at FRA or earlier to provide income during the bridge years. The surviving spouse inherits the larger of the two benefits.
How big should my Social Security bridge fund be?
For a single retiree starting bridge withdrawals at 60 with $60,000/year spending, the bridge fund typically runs $480,000-$640,000 depending on real-return assumptions. The calculator computes your specific number based on retirement age, spending, and return assumptions.
What is COLA and how does it affect bridge planning?
COLA = Cost-of-Living Adjustment. SSA increases benefits annually based on CPI-W inflation (2.5% average over the last decade). The age 70 benefit grows by both 8% delayed credits AND COLAs during the delay years, so the actual age 70 benefit is much higher than 124% of today's PIA.