Gross Income vs Net Income: Why the Gap Is Wider Than You Think

Gross income is the number on your offer letter. Net income is the number that hits your checking account. The first is what you can put in your bio. The second is what you can actually spend. People who confuse them tend to feel like the math of their life isn't working, and they're right, but not for the reason they think.

The way I think about it, the gap between gross and net is a tax on doing nothing. You don't see the deductions because they're taken out before the money ever feels like yours. That makes them easier to ignore, which makes them easier to underestimate. A $100,000 salary in California feels like $100,000 right up until your first paycheck shows roughly $5,500 instead of $8,333.

What the $100K Number Actually Buys You

Take a single filer in California earning $100,000 in 2025 who defers 5% into a 401(k). That $5,000 comes off the top and cuts taxable income. On what's left: federal income tax lands around $12,500, California income tax around $4,700 after the exemption credit, plus state disability insurance at 1.2% of wages. FICA is the flat one, 6.2% Social Security on wages up to the $176,100 cap plus 1.45% Medicare, so about $7,650 on a $100K salary.

Add health insurance at $200 a month and the take-home lands around $66,000 a year, or roughly $5,500 a month. The same person in Texas, with no state income tax and no SDI, keeps closer to $72,000. In New York City, where state and city income tax stack, it's closer to $64,000. Same gross. An $8,000 spread on nothing but a zip code.

The Two Common Mistakes

First, people budget against gross. They see $100K and assume they can spend like someone with $100K. The bank doesn't care about your salary. It cares about what clears the deposit line. Budget against net or you'll spend money that was never yours.

Second, people compare offers on gross alone. New York State and New York City tax stack on top of federal, so a $120K offer in NYC nets out to about what a $105K offer in Austin does, and that is before you touch cost of living, which usually decides the rest of it. The offer letter is structured to make this comparison hard. Doing the net math before accepting an offer is one of the highest-paid 30 minutes of work in a normal career.

Where Net Gets Slippery

Net is not just gross minus tax. It's gross minus everything that comes out of payroll, which can include things you actually want (401(k) match, HSA contribution, employer-paid health insurance) and things you don't (high-deductible health plans you'll never use, a parking benefit you don't need).

The trick is to look at the full pay stub, not just the bottom line. A pay stub that shows $5,500 net but is sending $1,000 into a 401(k) match plus an HSA isn't worse than a $6,200 net stub that has neither. The first one is building wealth that doesn't show up in checking. The second one is just bigger numbers in checking. Confusing the two is how people who “make a lot” end up with no savings.

Self-Employed and 1099 Workers

For W-2 employees, the employer covers half of FICA. For self-employed and 1099 workers, you cover both halves. That's the 15.3% self-employment tax, and the Social Security piece of it runs on net earnings up to the same $176,100 cap (2025). On top of federal and state tax, that's why a freelancer who bills $100K can end up with less take-home than an employee earning $100K, even before counting the lack of employer benefits.

The implicit math is that your gross as a 1099 should be roughly 25-35% higher than the equivalent W-2 number to compensate. Rule of thumb that gets violated constantly when contractors price their work.

The Take

Whenever you're evaluating an offer, a raise, or a side gig, do the net math. Use a free paycheck calculator and plug in your actual situation. The first time most people do this they realize the “raise” they got was about half what they thought, because the bracket math ate it. Knowing your real net by month is the most important number in a personal finance spreadsheet, and it's the one most people never look up.