社会保障計算機

2024年SSA PIA式を使って、米国社会保障の月次給付を推計します。FRA・62歳（早期）・70歳（繰下げ）での給付を比較。無料SSベネフィット計算機。

社会保障計算機とは？

米国社会保障制度は、給与税で賄われる退職・障害・遺族給付を提供する連邦プログラムです。月次給付は平均指数化月間収益（AIME）と受給開始年齢によって決まります。

計算式

AIME = 平均年収 ÷ 12

PIA = 90% × min(AIME, $1,115) + 32% × min(max(AIME − $1,115, 0), $5,606) + 15% × max(AIME − $6,721, 0)

計算方法

社会保障税の対象となる平均年収を入力してください
生年を入力してください — 計算機が完全退職年齢を自動的に決定します
希望退職年齢を62〜70歳の範囲で入力してください
選択した年齢、FRA、70歳での推定月次給付を確認してください
損益分岐年齢を確認して、遅らせることが有利な時期を理解してください
62〜70歳の各年齢での給付を比較する棒グラフを確認してください

例

1965年生まれで平均年間収入$60,000の労働者のAIMEは$5,000です。PIAは: 90% × $1,115 + 32% × ($5,000 − $1,115) = $1,003.50 + $1,243.20 = $2,247。FRAは67歳です。67歳で請求すると月約$2,247。62歳で請求（60ヶ月早期）すると給付が30%減額され、月約$1,573。70歳で請求すると24%の遅延credit（3年×8%）が加算され、月約$2,786。

主な利点

Instantly compare monthly benefits across all ages 62 to 70
Uses the official 2024 SSA PIA formula with current bend points
Break-even analysis shows exactly when delaying claims pays off
No personal data collected — all calculations run in your browser
Free planning tool for individuals, couples, and financial advisors

避けるべきよくある間違い

Claiming at 62 without considering life expectancy — if you live past ~78, delaying typically yields more total lifetime benefits
Using gross salary instead of earned wages subject to SS payroll tax (capped at $168,600 in 2024)
Ignoring spousal benefits — married couples should coordinate strategies, often having the higher earner delay to 70

プロのヒント

If you have health concerns or a shorter expected lifespan, claiming early at 62 may maximize lifetime benefits
Married couples: the higher earner should usually delay to 70 to maximize survivor benefits for the lower earner
Every year below 35 working years adds a zero to your AIME — work at least 35 years for maximum benefit

重要な用語の説明

AIME: Average Indexed Monthly Earnings — the 35-year average of your inflation-adjusted monthly earnings, the foundation of your SS benefit
PIA: Primary Insurance Amount — your base monthly SS benefit at Full Retirement Age
FRA: Full Retirement Age — age 66 (born 1943–1954) or 67 (born 1960+)
Bend Points: Income thresholds ($1,115 / $6,721 in 2024) where the PIA replacement rate steps down

この計算機を使用するタイミング

When planning your retirement age and SS claiming strategy
When comparing early vs. delayed retirement to find your personal break-even age
When modeling SS income alongside 401(k), pension, and IRA projections

よくある使用例

Comparing the financial impact of claiming Social Security at different ages
Building a retirement income plan that combines Social Security with 401(k)/IRA withdrawals
Estimating spousal or survivor benefits for married couples
Helping employees understand retirement benefit timing in HR financial wellness programs
Modeling Social Security income alongside pension and investment projections