15.3% Comes Out Before You See It. Here's What It Actually Buys.
A worker starting today will pay 2.32 times what the 1933 cohort paid for the same two programmes, inflation-adjusted. The 2026 Trustees Reports, read from the paycheque up.
The defining feature of a W-2 is that the money leaves before it arrives. You never hold it, never decide about it, never feel the transaction. 15.3 percent of every dollar you earn goes to Social Security and Medicare — 7.65 from you, 7.65 from your employer, and economists will tell you the employer half comes out of your wages too. It is the single largest line on most people's tax bill, larger than federal income tax for the majority of American workers, and almost nobody can tell you what it buys.
I just read the 2026 Trustees Reports for both programmes — several hundred pages of actuarial projection — and built the arithmetic out. Here is what your deduction is actually purchasing, and how the deal has changed across generations.
The rate has gone up nearly eightfold
When FICA started in 1937 the combined rate was 2.0 percent. It reached 15.3 percent in 1990 and has not moved since.
That last clause matters more than it looks. The rate has been frozen for 36 years, which means every increase in the real burden since 1990 has come from wage growth rather than legislation. The tax has become steadily more expensive without anyone ever having to vote for it — which is a very W-2 kind of problem. Nobody sends you a notice.
What it costs, in money that means something
Rate history alone understates it, because real wages grew too. Measured at the national average wage and converted into today's purchasing power:
| Year | Annual payroll tax, both halves, in 2026 dollars |
|---|---|
| 1951 | $1,048 |
| 1970 | $4,933 |
| 1990 | $8,076 |
| 2010 | $9,649 |
| 2026 | $11,329 |
| 2050 (projected) | $13,664 |
Eleven thousand dollars a year, in real terms, before income tax, before state tax, before you have bought anything.
The generational ledger
Take a hypothetical worker who earns exactly the national average wage for a 45-year career and change nothing but the birth year. Everything below is in constant 2026 dollars, so these are real comparisons, not the illusion of a bigger number:
| Cohort | Career | Lifetime payroll tax | vs the 1933 cohort |
|---|---|---|---|
| Born ~1933 | 1955–1999 | $260,195 | 1.00× |
| Born ~1948 | 1970–2014 | $358,223 | 1.38× |
| Born ~1963 | 1985–2029 | $430,611 | 1.65× |
| Born ~1982 | 2004–2048 | $513,759 | 1.97× |
| Born ~2004 | 2026–2070 | $603,665 | 2.32× |
Someone entering the workforce today will pay 2.32 times what their grandparents' cohort paid, in the same money, for the same two programmes. And the later rows are understated, because they assume the rate stays at today's 15.3 percent. Closing both programmes' funding gaps outright would take it to 20.11 percent.
And what does it buy?
This is where it gets uncomfortable, and where I want to be careful, because the honest answer has two halves and most people only ever quote one.
The first half. A career-average earner turning 62 in 2026 has a scheduled Social Security benefit of $2,608 a month — $31,301 a year, inflation-indexed for life. To pay for it they are handing over $9,182 a year in Social Security tax alone. I back-tested the alternative on real market history: every year's contribution into the S&P 500 at that year's actual total return. Depending on the year you retire, the pot lands between 3.1× and 9.0× what you paid in. To fund that same $31,301 income at a 4 percent withdrawal rate you would need roughly $2,935 a year at the S&P's long-run real return — about 37 percent of the retirement slice of your payroll tax.
That is a real gap, and it is the honest reason this argument never dies. If you feel like the deduction is a bad trade, the arithmetic does not entirely disagree with you.
The second half, which I am not going to skip. That comparison quietly leaves out four things, and they are not small:
- The money is not free to divert. Today's payroll taxes pay today's retirees. Redirect yours into a brokerage account and the benefits already promised are still owed — a $29.3 trillion present-value obligation that does not vanish because the funding did. You cannot pay the same dollar to a retiree and to an index fund.
- It is not only a pension. Of the 70 million people Social Security paid in December 2025, about 8 million were disabled workers and their families and 6 million were survivors of workers who died. An index fund pays nothing extra if you are disabled at thirty or die at forty leaving children.
- A portfolio is not an annuity. Social Security is a guaranteed inflation-indexed income for life with spousal and survivor protection. Four percent is a rule of thumb, not a guarantee.
- The spread is luck, not skill. That 3.1×-to-9.0× range comes from nothing but the year you happen to retire. Your Social Security cheque does not care whether you turned 67 in 2009 or 2021.
None of that makes the deduction feel better. It does mean the honest framing is "this is expensive insurance you cannot opt out of," not "this is a rip-off you could beat by opening a brokerage account." Both readings get quoted; only one survives contact with the numbers.
The part that gets worse after you stop working
Here is the fact I did not expect, and it is the one that matters most if you are planning a retirement number.
The 2026 Social Security cost-of-living adjustment is 2.8 percent. The standard Medicare Part B premium — deducted from that same cheque — went from $185.00 to $202.90, a 9.7 percent rise. Your raise was outrun by roughly seven percentage points, in one year, on a bill you cannot decline.
Project it forward and inflation does not rescue you. Between 2026 and 2035 general prices rise 17.5 percent while the Part B premium rises 77.7 percent — a 51 percent increase after inflation. The premium reaches $360.60 a month, and the annual cost of Part B alone goes from $2,435 to $4,327 in cash, or $3,684 in today's money.
So the retirement number in your spreadsheet has a line in it that grows at three times the rate of your indexed income, forever. That is worth modelling explicitly rather than assuming a flat healthcare cost.
Why this belongs on a book about the W-2 trap
Because it is the same mechanism, one layer down.
The trap was never that a salary is small. It is that a salary is processed — withheld, matched, remitted, reported — before any judgement of yours touches it. Payroll tax is the purest example on the pay stub. You cannot defer it, time it, shelter it in a retirement account, or offset it with a loss. A business owner has some latitude on how income is characterised. A W-2 employee has none, on the largest single deduction they face.
Knowing what it buys does not get you out of it. But it does change what you are optimising. If 15.3 percent is untouchable and the healthcare line grows at three times your COLA, then the leverage is not in trimming the deduction. It is in the share of your income that never enters the W-2 system in the first place — which is what the rest of this book is about.
The full research, free
I built four infographics out of these reports. Each is written twice — once for a person working out what happens to their own cheque, once for someone who has to vote on it — and every figure carries its table and page number. All are free to read and free to download:
- The generational ledger (PDF, 8 pages) — the payroll tax back-test above, in full, plus the sequence-of-returns data
- Social Security 2026 (PDF, 13 pages) — depletion dates, the size of the fix, and the cost of waiting
- Medicare 2026 (PDF, 12 pages) — the two trust funds and what you actually pay
- SSI 2026 (PDF, 7 pages) — the benefit floor and the asset test frozen since 1989
The interactive versions, with the methodology written out, are at jwatte.com.
Sources
- 2026 OASDI Trustees Report — scheduled benefit formula (figure V.C1), the $29.3 trillion unfunded obligation (p. 7), beneficiary counts (p. 4), and the CPI and average-wage series (table VI.G1). ssa.gov/OACT/TR/2026/
- 2026 Medicare Trustees Report — Part B premiums and deductibles (tables III.C2 p. 83 and V.E2 p. 207). cms.gov/oact/tr/2026
- SSA Office of the Chief Actuary — Social Security & Medicare Tax Rates 1937 to present; the national Average Wage Index 1951–2024; SSI payment standards. ssa.gov/oact/
- Inflation — the CPI series underlying the 2026 Trustees Report, spliced to CPI-U (FRED, CPIAUCNS) before 1970.
- Market returns — S&P 500 annual total returns 1928–2025, NYU Stern historical dataset. Real returns are geometric and CPI-deflated.
The hypothetical worker earns the national average wage for 45 unbroken years, which almost nobody does; real careers have gaps and earnings well above or below the average, and the benefit formula treats those very differently. Social Security deliberately replaces a much larger share of a low earner's wage than a high earner's, so an average-wage comparison hides exactly that.
This post is informational, not financial, tax, or investment advice. I am not a licensed adviser, and past index returns are not a promise of future ones. It is a reading of public government documents with page and table numbers attached so you can check any figure yourself.
