Guide to Social Security

Why this matters

For most retirees, Social Security is the single biggest piece of guaranteed, inflation-adjusted income they’ll ever have. The lever you control — when you claim — is also the most powerful one in the whole retirement-income toolkit. Claim early at 62 and your benefit shrinks ~30% for life. Wait to 70 and it grows ~24% over your Full Retirement Age amount. That’s a swing of more than 50% on a check that arrives every month for the rest of your life and adjusts upward with inflation.

This guide is the high-level map. Pair it with the Retirement Withdrawal Calculator to see how different claim ages change how long the rest of your portfolio lasts.

How benefits are calculated

Your benefit is based on your 35 highest-earning years, indexed for wage growth. The Social Security Administration averages those 35 years (filling zeros if you didn’t work 35 years), runs that average through a progressive formula, and produces a number called your Primary Insurance Amount (PIA) — the monthly check you’d receive if you claimed exactly at your Full Retirement Age.

You can pull your real number — including a year-by-year projection at every claim age — from your SSA account at ssa.gov/myaccount. Do this even if you’re 30. The estimate gets sharper as your work history fills in, and the act of logging in confirms no one has fraudulently opened an account in your name (a real, common form of identity theft).

Why an extra working year can move your PIA

Because the formula uses your top 35 years, working a 36th year that’s higher than one of your earlier 35 will replace that older year and lift your benefit. People who are mid-career often don’t realize that a few late-career high-earning years can meaningfully increase their lifetime benefit — even beyond delaying.

Full Retirement Age (FRA)

FRA is the age at which you receive 100% of your earned benefit. It depends on your birth year:

• Born 1943–1954: FRA is 66.
• Born 1955–1959: FRA rises in two-month increments — 66 and 2 months for 1955, 66 and 4 months for 1956, and so on.
• Born 1960 or later: FRA is 67.

Three claim windows matter:

• Age 62: the earliest you can claim. Benefits are reduced by roughly 30% versus your FRA amount, permanently.
• Your FRA: 100% of your earned benefit.
• Age 70: the latest you should claim. Each year you delay past FRA earns 8% per year in delayed retirement credits — about 24% more than your FRA amount if you wait the full three years. There’s no benefit to delaying past 70.

In other words: claiming at 62 vs. 70 is a roughly 77% bigger monthly check for life. The check is also COLA-adjusted, so the gap compounds in real terms.

When to claim — the break-even logic

The math behind the claim-age decision is simple in concept: claim early and you collect more checks, each smaller. Claim later and you collect fewer checks, each larger. There’s a break-even age where the cumulative dollars match.

For most people:

• Claiming at 62 vs. 67 breaks even around age 78–80. Live past that and delaying wins; die before and claiming early wins.
• Claiming at 67 vs. 70 breaks even around age 80–82. Same logic.

But cumulative dollars isn’t the only thing that matters. A few other levers:

• Longevity in your family. If both parents lived into their late 80s and you’re healthy, the odds favor delaying. If your family history is shorter, claiming earlier defends against not collecting at all.
• Spousal protection. When one spouse dies, the survivor receives the higher of the two benefits. This means the higher earner delaying acts as longevity insurance for the surviving spouse — often the most overlooked reason to delay.
• Whether you can afford to delay. Delaying SS means drawing more from your portfolio (or working longer) in your 60s. If that’s not feasible, claim and move on.
• Behavioral. Money in hand at 62 sometimes feels safer than the promise of more at 70. That’s a real consideration even if the math points the other way.

Claiming while still working

You can claim before FRA and keep working, but Social Security applies an earnings test: above an annual threshold (~$23k in recent years, indexed upward), they withhold $1 of benefits for every $2 you earn over the limit. The withheld amount isn’t lost forever — it’s recovered as a higher benefit once you reach FRA — but the cash-flow effect is real.

After FRA, the earnings test goes away. You can earn unlimited income without any benefit reduction.

Spousal benefits

A married worker is entitled to the larger of:

• Their own earned benefit, OR
• Up to 50% of their spouse’s Primary Insurance Amount (the spouse’s FRA amount), assuming the spouse has filed.

This means a lower-earning spouse may get more from claiming on the higher-earning spouse’s record than from their own work history. The percentage is reduced if the lower-earning spouse claims before their own FRA.

Survivor benefit: when one spouse dies, the survivor receives 100% of the deceased’s benefit (or their own, whichever is higher). The two checks don’t combine — the household drops to one. This is the central reason the higher earner delaying matters: a 24% larger benefit at 70 becomes a 24% larger survivor benefit for the spouse who outlives them.

Divorced spouses: if you were married 10+ years and haven’t remarried, you may be entitled to spousal benefits on an ex’s record. This doesn’t reduce the ex’s benefit and doesn’t require their cooperation.

How Social Security gets taxed

Up to 85% of your Social Security benefit can be subject to federal income tax, depending on your provisional income (adjusted gross income

• tax-free interest + half of your SS benefit):

• Single filers, provisional income above ~$25k: up to 50% of benefits are taxable.
• Single, above ~$34k: up to 85% of benefits are taxable.
• Married filing jointly, above ~$32k: up to 50%; above ~$44k, up to 85%.

These thresholds aren’t indexed for inflation — they were set in the 1980s and 1990s — so over time, more retirees fall into the taxable zone just from price drift. Plan as if at least 50% (and likely 85%) of your benefit will be taxable in retirement.

A handful of states tax Social Security too, though most don’t. Check your state’s rules.

How SS interacts with portfolio withdrawals

This is where the Retirement Withdrawal Calculator becomes useful. Every dollar of SS income is one less dollar your portfolio has to produce. The implications:

• Delaying SS = larger portfolio draws in the bridge years (62–70), then smaller draws for life. This often improves portfolio survival because the years past 70 are exactly when sequence-of-returns risk is highest and having a larger guaranteed income floor is most valuable.
• Claiming early = smaller portfolio draws in your 60s, larger draws thereafter. Lower stress in early retirement, but a longer portfolio drawdown horizon at a smaller SS floor.
• Working longer = both more late-career earnings (potentially raising your PIA) and fewer years of retirement drawdown. Often the highest-impact single decision available.

Solvency — the elephant in the room

You’ll see headlines about Social Security “running out of money in 2033” or similar. The honest version:

• The trust fund that backs SS is projected to be exhausted in the early 2030s under current law.
• After that, payroll taxes still flowing in cover roughly 77% of scheduled benefits — meaning, absent a fix, benefits would have to be cut by ~23% unless Congress acts.
• Congress has historically acted (1983 was the last big fix). The political cost of cutting current retirees is high, so most reform proposals affect future retirees and higher earners disproportionately.

For planning, two reasonable approaches:

1. Plan for full benefits, since cuts have always been politically negotiated downward in size and forward in time. This is what the SSA itself uses in your statement.
2. Stress-test with a 20% benefit cut in your 70s+ to see whether your plan still works. If yes, you have margin; if no, you have homework.

The Retirement Withdrawal Calculator lets you adjust the benefit amount, so you can run both scenarios and decide.

What to do today

• Pull your SSA statement at ssa.gov/myaccount. Note your projected benefit at 62, FRA, and 70.
• Save those three numbers somewhere durable. They’re inputs you’ll re-use for the rest of your working life.
• Run the Retirement Withdrawal Calculator with each of the three claim ages. Notice how your “money lasts to age X” answer changes.
• Read the Order of Operations guide if you’re still in accumulation. SS is the income floor; the portfolio is what fills the gap. Building the portfolio is the order-of-operations job.

Sources

• Social Security Administration — Retirement Benefits
• SSA — Full Retirement Age table
• SSA — Delayed Retirement Credits
• IRS Publication 915 — Social Security and Equivalent Railroad Retirement Benefits
• SSA Trustees Report (annual)