How progressive tax actually works
The single most common misunderstanding about income tax is that moving into a higher bracket taxes all your income at that rate. It does not. Only the income inside each bracket is taxed at that bracket's rate.
Earning one dollar more than a bracket threshold means that one dollar is taxed at the higher rate. Everything below it is unaffected. A raise can never leave you with less take-home pay.
Effective versus marginal rate
- Marginal rate is the rate on your next dollar of income — your top bracket.
- Effective rate is total tax divided by total income — always lower.
Someone earning $85,000 in the US sits in the 22% bracket but pays an effective federal rate of about 12.1%. The marginal rate matters for decisions about extra income; the effective rate is what you actually pay.
US federal income tax
| Rate | Single | Married filing jointly |
|---|---|---|
| 10% | $0 – $12,400 | $0 – $24,800 |
| 12% | $12,400 – $50,400 | $24,800 – $100,800 |
| 22% | $50,400 – $105,700 | $100,800 – $211,400 |
| 24% | $105,700 – $201,775 | $211,400 – $403,550 |
| 32% | $201,775 – $256,225 | $403,550 – $512,450 |
| 35% | $256,225 – $640,600 | $512,450 – $768,700 |
| 37% | Above $640,600 | Above $768,700 |
The standard deduction for 2026 is $16,100 for single filers, $32,200 for married filing jointly and $24,150 for head of household. Roughly 90% of filers take it rather than itemising.
FICA — the tax people forget
Separate from income tax, FICA funds Social Security and Medicare. Employees pay 6.2% for Social Security on wages up to $184,500 (2026) and 1.45% for Medicare with no cap, plus an additional 0.9% Medicare surtax above $200,000. Employers match the first two.
Effective federal income tax rate 11.61%, marginal rate 22%. State tax, where applicable, comes on top.
India: new regime versus old
India now runs two parallel systems. The new regime is the default and offers lower rates with almost no deductions. The old regime has higher rates but allows 80C, HRA, home loan interest and much else.
| Income | Rate |
|---|---|
| Up to ₹4,00,000 | Nil |
| ₹4,00,001 – ₹8,00,000 | 5% |
| ₹8,00,001 – ₹12,00,000 | 10% |
| ₹12,00,001 – ₹16,00,000 | 15% |
| ₹16,00,001 – ₹20,00,000 | 20% |
| ₹20,00,001 – ₹24,00,000 | 25% |
| Above ₹24,00,000 | 30% |
A standard deduction of ₹75,000 applies to salaried taxpayers under the new regime. Critically, the Section 87A rebate means income up to ₹12,00,000 attracts no tax at all — with the standard deduction, that extends to about ₹12,75,000 of gross salary.
Health and education cess of 4% is added to the computed tax in both regimes. Surcharge applies above ₹50,00,000.
Legitimate ways to reduce the bill
United States
- Max the 401(k). $24,500 in 2026, plus $8,000 catch-up from age 50. Reduces taxable income directly.
- HSA if eligible. Triple tax advantage — deductible going in, growth untaxed, withdrawals for medical costs untaxed.
- Traditional IRA. Up to $7,500 in 2026, subject to income limits if you have a workplace plan.
- Tax-loss harvesting. Realised losses offset gains, and up to $3,000 of ordinary income a year.
India
- Section 80C — ₹1,50,000 across PPF, ELSS, EPF, life insurance and principal repayment. Old regime only.
- Section 80CCD(1B) — an extra ₹50,000 for NPS, over and above 80C. Old regime only.
- Section 80D — health insurance premiums, ₹25,000 or ₹50,000 for senior citizens.
- Section 24(b) — up to ₹2,00,000 of home loan interest on a self-occupied property.
- Section 80CCD(2) — employer NPS contribution, available under both regimes.
Model the individual instruments with the PPF calculator, the NPS calculator and the HRA calculator.
Frequently asked questions
Will a raise put me in a higher bracket and cost me money?
No. Only the income above the threshold is taxed at the higher rate. Everything below it is taxed exactly as before, so a raise always leaves you with more take-home pay.
The one genuine exception is benefit cliffs — losing a subsidy or credit at a specific income — which is a separate issue from tax brackets.
What is the difference between effective and marginal tax rate?
Marginal is the rate on your next dollar; effective is total tax divided by total income. Effective is always lower under a progressive system.
A US single filer on $85,000 has a 22% marginal rate and roughly an 11.6% effective federal rate.
Should I take the standard deduction or itemise?
Take whichever is larger. With a $16,100 standard deduction for single filers in 2026, itemising only pays off with substantial mortgage interest, state taxes and charitable giving.
About 90% of US filers take the standard deduction since it was roughly doubled in 2018.
Which Indian tax regime should I choose?
It depends on your deductions. The old regime generally wins if your total deductions exceed roughly ₹3,75,000 to ₹4,25,000 — a full 80C, meaningful HRA and home loan interest.
Below that the new regime usually wins, and its ₹12,00,000 rebate threshold makes it very favourable for middle incomes. Run both.
Does this include state or local tax?
Only if you enter a rate in the advanced options, and then only as a flat approximation. Real state tax systems have their own brackets and deductions.
Nine US states levy no income tax: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington and Wyoming.
Is this an official tax calculation?
No. It is a simplified estimate covering the main brackets, standard deduction and payroll tax. It does not model credits, alternative minimum tax, capital gains, self-employment tax or local levies.
Use it for planning, not filing. For anything binding, consult a tax professional or official software.