The Math Behind Pay Periods
Converting between pay periods seems simple — divide by 12 for monthly, divide by 52 for weekly. But there's a gotcha with biweekly pay that trips up a lot of people.
A biweekly schedule gives you 26 paychecks per year (52 weeks divided by 2). That means you get two "extra" paychecks compared to a semimonthly schedule (24 per year). So multiplying your biweekly check by 26 gives you more than multiplying your monthly salary by 12. They don't match, and the difference isn't a rounding error — it's real money.
- Annual to monthly: divide by 12
- Annual to biweekly: divide by 26
- Annual to weekly: divide by 52
- Annual to hourly: divide by (hours per week times 52)
So if you make $75,000 a year, that's $6,250/month, $2,884.62 biweekly, $1,442.31 weekly, or roughly $36.06/hour at 40 hours a week.
Gross vs. Net: Why Your Paycheck Shrinks
Your gross pay is the big number on your offer letter. Your net pay — what actually lands in your bank account — is noticeably smaller. The gap comes from a handful of deductions, some of which you control more than you might think:
- Federal income tax (the big one)
- State and local taxes (varies wildly — zero in Texas and Florida, over 13% in California for high earners)
- FICA: Social Security (6.2%) and Medicare (1.45%)
- Health insurance premiums
- Retirement contributions like your 401(k)
A $75,000 salary in, say, Ohio might leave you with around $56,000 after federal taxes and FICA alone. Tack on state tax, health insurance, and a 5% 401(k) contribution, and you could be looking at closer to $48,000 net. That's why knowing your net pay matters more than knowing your gross.
How Tax Brackets Actually Work (No, Not All Your Money Gets Taxed at One Rate)
The US uses a progressive system. Think of it like buckets. Your income fills the first bucket (10% bracket) up to $11,600. Then it spills into the next bucket (12%), and so on. Only the money in each bucket gets taxed at that rate.
This means earning $100,000 doesn't put your entire income in the 24% bracket. The first $11,600 is taxed at 10%, the next $35,550 at 12%, the next $53,375 at 22%, and only the last $47 (the amount over $100,525) at 24%.
| Bracket | Tax Rate | Taxable Income Range |
|---|---|---|
| 1st | 10% | $0 – $11,600 |
| 2nd | 12% | $11,601 – $47,150 |
| 3rd | 22% | $47,151 – $100,525 |
| 4th | 24% | $100,526 – $191,950 |
| 5th | 32% | $191,951 – $243,725 |
| 6th | 35% | $243,726 – $609,350 |
| 7th | 37% | $609,351+ |
Your marginal rate (the rate on your last dollar) will always be higher than your effective rate (total tax divided by total income). On $100,000, your marginal rate is 24% but your effective rate is only about 17.4%.
The FICA Line Item Nobody Explains
FICA stands for Federal Insurance Contributions Act, and it shows up on every paycheck. It has two pieces:
- Social Security tax: 6.2% of your wages, capped at $168,600 in 2024. Anything above that is SS-tax-free.
- Medicare tax: 1.45% with no cap. Earn over $200,000? There's an additional 0.9% surtax on the amount above that threshold.
Your employer matches both of these, so the government collects 15.3% total. If you're self-employed, you pay the whole thing yourself (that's the "self-employment tax" people complain about).
Real-World Salary Breakdowns
Here's what a few common salaries look like after federal taxes and FICA for a single filer taking the standard deduction:
| Gross Salary | Federal Tax | FICA | Est. Net Pay | Effective Rate |
|---|---|---|---|---|
| $50,000 | $4,408 | $3,825 | $41,767 | 16.5% |
| $75,000 | $8,423 | $5,738 | $60,840 | 18.9% |
| $100,000 | $14,768 | $7,650 | $77,582 | 22.4% |
| $150,000 | $27,148 | $10,363 | $112,490 | 25.0% |
These are federal-only numbers. Add your state tax, insurance premiums, and retirement contributions, and net pay drops further.
Common Questions
How close is this take-home estimate to my real paycheck?
It's in the right ballpark for federal tax as a single filer with the standard deduction. But your actual paycheck also has state taxes (anywhere from 0% to over 13%), health insurance, 401(k) contributions, and possibly other deductions. For a more tailored number, try our tax calculator where you can pick your filing status and deductions.
What salary counts as "good" in 2024?
Depends entirely on where you live and what you do. The median US household income sits around $75,000. In San Francisco or New York, $100k can feel tight after rent. In much of the Midwest or South, $75k goes a long way. Cost of living matters more than the raw number.
Why do I get three paychecks in some months?
With biweekly pay (every other Friday), there are 26 pay periods in a year. Since most months don't divide evenly into 2-week chunks, two months out of the year will have three paydays. It's not a bonus — it's just how the calendar works. Budget for 24 paychecks a year and treat the extra two as a windfall.
Related Calculators
- Tax Calculator — Detailed federal income tax estimation
- Retirement Calculator — Plan your retirement savings
- Mortgage Calculator — How much home can you afford?
- Compound Interest Calculator — See how savings grow over time
This calculator provides estimates based on 2024 federal tax brackets for single filers. It does not account for state taxes, deductions, credits, or pre-tax contributions. Consult a tax professional for accurate figures.