The first attending paycheck: a complete decoder

Your first attending paycheck on a $300,000 salary will be roughly $7,400 — not the $12,500 your contract implies per semimonthly period, and nowhere near the number you imagined in your last year of residency. About $5,100 of every check disappears before it reaches your account, and most new attendings cannot say where more than half of it went.

That gap is not a payroll error, and it is not a reason to panic. It is the predictable output of the 2026 federal brackets, FICA, state tax, and your own benefit elections — every line of which you can decode in about ten minutes. This article walks through each line of a realistic first attending paycheck, explains the withholding quirks that make the first check uniquely confusing, and ends with a full gross-to-net table you can check your own stub against.

The example throughout: a single physician starting an employed position at $300,000 base salary, paid semimonthly (24 checks of $12,500), contributing the full $24,500 401(k)/403(b) elective deferral for 2026, working in Pennsylvania (3.07% flat state tax). Your numbers will differ; the structure will not.

Start with the only number that is actually yours: gross pay

A $300,000 salary paid semimonthly produces a gross of $12,500 per check. Confirm this first, because every other line is calculated from it. Common reasons the gross itself looks wrong:

• A partial first period. If you started mid-cycle, the first check is prorated. A start date five working days into a ten-day period produces roughly half a check.
• Biweekly vs. semimonthly confusion. Biweekly (26 checks) gives $11,538 per check, not $12,500. Two months a year you get a third check.
• A signing bonus folded into check one. Bonuses are usually withheld at the IRS flat supplemental rate of 22% (37% on supplemental wages above $1 million), which is lower than your top marginal rate. The check looks bigger than expected now; the difference is settled on your tax return.

Pre-tax deductions: the lines that lower your taxable income

These come out before income tax is calculated, which means each dollar here saves you your marginal rate — 32 to 35 cents on the dollar for this physician.

• 401(k)/403(b) elective deferral: $24,500 for 2026 ÷ 24 checks = $1,021 per check. At a 32% marginal rate, that $1,021 only reduces your take-home by about $694.
• Health, dental, vision premiums: typically pre-tax under a Section 125 plan. We will use $250 per check for employee-only coverage — yours may be far higher with a family.
• HSA contributions (if you chose a high-deductible plan): up to $4,400 individual / $8,750 family in 2026, and uniquely, HSA payroll contributions also avoid FICA.

Federal income tax withholding: the biggest line, decoded

Federal withholding is not a flat percentage of your salary. Payroll software annualizes your per-check wages, runs them through the 2026 brackets using your W-4 entries, and divides back down. For our physician, taxable income for the year is approximately:

Spread over 24 checks, that is roughly $2,398 per check of federal withholding. If your stub shows something materially different, the cause is almost always your W-4: claiming dependents you do not have, a second-job checkbox, or extra withholding you forgot you requested.

Note the distinction that confuses almost everyone — and the bracket detail in this example. On salary alone, $300,000 would put you in the 35% bracket. After the 401(k) deferral and pre-tax premiums, taxable income of $253,400 lands in the 32% bracket: your pre-tax deductions dropped you a full bracket. And either way, your average federal rate is about 19% — you pay the top rate only on the last dollars, not on everything.

FICA: Social Security and Medicare, including the lines residents never hit

FICA appears as two (sometimes three) lines, and 2026 has specific numbers:

• Social Security (OASDI): 6.2% of wages up to the $184,500 wage base. Per check: $775. Once your year-to-date wages cross $184,500, this line drops to zero for the rest of the calendar year. At $12,500 per check starting in January, that happens partway through check 15 — your take-home jumps by roughly $775 per check for the remainder of the year. It is not a raise. It resets every January 1.
• Medicare: 1.45% of all wages, no cap. Per check: $181.
• Additional Medicare Tax: 0.9% on wages above $200,000 in the calendar year. Your employer must begin withholding it once your YTD wages pass $200,000 — for our physician, at check 16. That adds $113 per check for the rest of the year.

Annual FICA total for a $300,000 W-2 salary in 2026: $11,439 Social Security + $4,350 Medicare + $900 Additional Medicare = $16,689. Note that 401(k) deferrals do not reduce FICA wages — only HSA payroll contributions and Section 125 premiums do.

State and local tax: the line that varies 0% to 13.3%

Our Pennsylvania physician pays a flat 3.07%: $384 per check, about $9,210 per year. The same salary in Texas or Florida pays $0. In California, the top marginal state rate reaches 13.3%, and the same gross salary can cost over $20,000 more per year in state tax than in Pennsylvania.

Many states add local layers — Pennsylvania municipalities levy a local earned income tax (commonly around 1%), New York City adds roughly 3–4%, and several Ohio cities and Maryland counties add 2–4%. If you see an unfamiliar acronym near the state line (EIT, LST, OPT), it is local tax, and it is usually correct.

If you are weighing offers in different states, compare after-tax, not gross: a $290,000 offer in Florida can net more than a $300,000 offer in California once state tax is applied — before any cost-of-living difference. State tax is a permanent, every-check line; negotiate with it in view.

The lines that are not taxes: benefits, insurance, and imputed income

A few more lines deserve a glance, because two of them have real planning consequences.

Employer retirement contributions usually do not appear as a deduction — they are employer money — but many stubs show them in a memo section. If your employer matches or contributes to a 403(b) or 401(a), remember the 2026 combined employee-plus-employer limit under §415(c) is $72,000. Your $24,500 deferral plus a typical match leaves substantial room, which matters later if your plan allows after-tax contributions.

Group disability insurance often shows as an employer-paid line or a small deduction. The detail that matters: if the employer pays the premium pre-tax, any benefit you ever collect is taxable income; if you pay the premium with after-tax dollars, the benefit is tax-free. A 60% group benefit that is then taxed can replace closer to 40% of your income. This is one reason an individual own-occupation policy paid personally is the standard for physicians — but that is its own article.

Group term life over $50,000 generates "imputed income" — a small addition to your taxable wages for employer-paid coverage above $50,000. It appears as a line like "GTL" and slightly raises your tax, not your take-home.

Parking, transit, and miscellaneous deductions are usually small and often pre-tax. The one to question is anything you do not recognize at all — wage garnishments, charity elections from a default checkbox, or duplicate premiums after a benefits change.

What you will not see: your employer's share of FICA (they match your 6.2% and 1.45%), and your malpractice premium, which the employer typically pays entirely off-stub.

Why the first check specifically surprises people

Three mechanics make the first attending check feel wrong even when every line is correct.

First: annualized withholding ignores your resident half-year. Payroll withholds as if you will earn $12,500 per check for the entire calendar year — $300,000. But if you started in August, your actual W-2 income for the year is roughly half a resident salary plus five months of attending pay, perhaps $155,000. The withholding tables take no notice. Result: most mid-year graduates are meaningfully over-withheld in year one and receive a large refund the following spring. Pleasant, but it means months of an interest-free loan to the IRS. You can correct it prospectively with the IRS Tax Withholding Estimator at irs.gov and a revised W-4 — or simply accept one year of imprecision.

Second: every deduction starts at full strength simultaneously. Maximum 401(k) deferral, first-ever Additional-Medicare-scale income, new benefit premiums, possibly disability and life insurance elections — all land on one stub at once. A resident's check had perhaps five lines. Yours now has twelve.

Third: benefits often bill in arrears or double-deduct at enrollment. If coverage started before payroll caught up, the first check may take two periods' worth of premiums at once. This self-corrects by the second or third check, but it is the most common reason check one is a few hundred dollars lighter than check three. If the double deduction persists past a month, that is a payroll ticket, not a tax mystery.

The full gross-to-net worked example

Here is the complete decode for our physician — $300,000, single, semimonthly, Pennsylvania, full 401(k) deferral, $250/check health premium. Per-check figures are for a normal early-year check (before the Social Security cap).

(Local earned income tax rates vary by municipality — 1% is typical in Pennsylvania but not universal; confirm yours.)

The honest summary: a $300,000 salary in this scenario produces about $183,000 of take-home cash — roughly 61 cents per gross dollar — plus $24,500 building in a retirement account and $6,000 of health coverage paid with pre-tax dollars. Counting the 401(k), about 69% of gross is going somewhere that benefits you.

What about bonuses, moonlighting, and RVU payouts?

Three common additions to the base check, briefly:

• Signing and quality bonuses are supplemental wages — withheld at a flat 22% federally (37% above $1M). Since your marginal rate is in the low-to-mid 30s, expect to owe roughly the 10-to-13-point difference at filing. A $30,000 signing bonus withheld at 22% can leave $3,000–$4,000 of federal tax still due in April.
• 1099 moonlighting has no withholding at all. You owe both income tax at your marginal rate and self-employment tax, generally via quarterly estimated payments. A $30,000 1099 side income can carry a combined federal bill in the $12,000–$14,000 range depending on the SE-tax interaction — do not spend it gross.
• wRVU/productivity payouts are usually treated as supplemental wages too. Same 22% withholding gap, same April reconciliation.

Common questions

Why is my withholding higher than my actual tax bill?

Because the W-4 system annualizes each check and assumes a full year at that rate. Mid-year graduates, physicians with large deductions, and anyone whose W-4 still reflects an old job are commonly over-withheld. The fix is a new W-4 informed by the IRS estimator — or treating the spring refund as a forced savings plan, which is suboptimal but not catastrophic.

My take-home went up in October without a raise. What happened?

You crossed the $184,500 Social Security wage base, and the 6.2% OASDI line stopped for the rest of the calendar year. It restarts in January. Treat the temporary surplus as found money for loans or savings, not as a baseline.

What will my monthly take-home actually be on $300,000?

In this worked example, about $15,250 per month after maxing the 401(k), paying $500 per month in health premiums, and Pennsylvania taxes. In a no-income-tax state the figure rises to roughly $16,200; in a high-tax state it can fall under $14,000. The honest planning number for a single $300,000 attending is $14,000–$16,000 per month depending on state and benefit elections.

Should I claim exempt or reduce withholding since I only worked half the year?

You can reduce withholding via the W-4 to reflect a partial year, and the IRS estimator handles this case well. Claiming fully exempt is almost never correct for an attending and risks underpayment penalties if you miscalculate. Precision is optional in year one; by year two your withholding should track your real liability within a few hundred dollars.

Does maxing my 401(k) reduce my Social Security and Medicare taxes?

No. Elective deferrals reduce income tax wages, not FICA wages. HSA contributions made through payroll and Section 125 health premiums reduce both. This is one reason the HSA is arguably the most tax-favored account available to you: pre-tax going in (including FICA via payroll), tax-free growth, tax-free out for medical expenses.

My spouse also works. Anything different?

Yes — two things. The Additional Medicare Tax threshold is based on your joint return ($250,000 MFJ) but each employer only withholds based on that job's wages over $200,000, so dual-income couples are frequently under-withheld for it. And the MFJ brackets are not double the single brackets at the top end; run the combined numbers rather than assuming each paycheck's withholding covers you.

What to do next

1. Pull your first stub and label every line. Anything you cannot identify, ask payroll about within the first month — errors compound quietly.
2. Verify the 401(k) deferral is on and pacing to $24,500. Per-check target: $1,021 semimonthly, $942 biweekly.
3. Run the IRS Withholding Estimator with your actual partial-year numbers and file a corrected W-4 if the gap is large.
4. Check the FICA lines against the 2026 numbers: 6.2% to $184,500, 1.45% throughout, +0.9% after $200,000 YTD.
5. Assign the surplus before it assigns itself. Decide loan, retirement, and savings amounts as fixed monthly transfers in the first 90 days — the window before lifestyle expands is short.

If you want this done against your actual stub rather than a model, the paycheck decoder inside Attending Financial reads your real numbers, flags lines that deviate from the 2026 rules above, and projects your annual take-home — including the month your Social Security line stops.