The Three-Step Estimate
Federal income tax looks complicated, but a solid estimate for most wage earners comes down to three steps:
- Start with gross income and subtract pre-tax contributions such as a traditional 401(k) or HSA.
- Subtract the standard deduction (or your itemized deductions, if they are larger) to get taxable income.
- Run taxable income through the brackets, one slice at a time, then subtract any credits.
This guide covers federal income tax only. State and local income taxes, and payroll taxes such as Social Security and Medicare (FICA), are separate.
The 2026 Standard Deduction
For tax year 2026 (returns filed in 2027), the IRS set the standard deduction at:
| Filing status | 2026 standard deduction |
|---|---|
| Single or married filing separately | $16,100 |
| Married filing jointly | $32,200 |
| Head of household | $24,150 |
Most households take the standard deduction. Itemizing only helps when deductions such as mortgage interest, state and local taxes and charitable gifts add up to more than these amounts.
The 2026 Federal Tax Brackets
The seven rates are unchanged at 10% to 37%; the income thresholds were adjusted for inflation. These are ranges of taxable income, after the deduction:
| Rate | Single | Married filing jointly |
|---|---|---|
| 10% | Up to $12,400 | Up to $24,800 |
| 12% | Up to $50,400 | Up to $100,800 |
| 22% | Up to $105,700 | Up to $211,400 |
| 24% | Up to $201,775 | Up to $403,550 |
| 32% | Up to $256,225 | Up to $512,450 |
| 35% | Up to $640,600 | Up to $768,700 |
| 37% | Above $640,600 | Above $768,700 |
Heads of household have their own thresholds (10% up to $17,700, 12% up to $67,450, 22% up to $105,700, and so on), listed in IRS Revenue Procedure 2025-32.
Marginal vs. Effective Rate
The bracket table is the source of the most common tax myth: that earning more can "bump you into a higher bracket" and leave you with less. It cannot. Each rate applies only to the dollars inside its band.
- Marginal rate: the rate on your last dollar of taxable income. It tells you what an extra dollar of income, or an extra dollar of pre-tax 401(k) contribution, is worth.
- Effective rate: your total tax divided by your income. It is always lower than the marginal rate because your first dollars are taxed at 10% and 12%.
Worked Example: $85,000 Salary, Single
Gross income: $85,000. Subtract the $16,100 standard deduction and taxable income is $68,900.
- 10% on the first $12,400 = $1,240
- 12% on the next $38,000 ($12,400 to $50,400) = $4,560
- 22% on the remaining $18,500 ($50,400 to $68,900) = $4,070
Federal income tax: $9,870 before credits. The marginal rate is 22%, but the effective rate is $9,870 ÷ $85,000 = 11.6% of gross income. Payroll tax (FICA at 7.65% of wages) adds about $6,503 on top.
If this person put $5,000 into a traditional 401(k), taxable income would fall to $63,900 and the tax would fall by 22% of $5,000, or $1,100. That is the marginal rate at work.
Credits vs. Deductions
A deduction lowers taxable income, so it saves you your marginal rate. A credit, such as the Child Tax Credit, comes straight off the tax bill dollar for dollar. A $1,000 credit is worth $1,000; a $1,000 deduction is worth $220 to someone in the 22% bracket.
Getting Withholding Right: W-4 Tips
Your estimate is most useful for checking that your paycheck withholding is on target, so you do not owe a large bill or give the government an interest-free loan.
- Use the IRS Tax Withholding Estimator at irs.gov once a year and after any life change. It tells you what to enter on a new Form W-4.
- Two jobs or two earners: check the box in Step 2 of the W-4 or use the multiple-jobs worksheet. Each employer otherwise withholds as if its paycheck were your only income, which often leads to under-withholding.
- Dependents: claim them in Step 3 so withholding reflects the credits you expect.
- Side income: add it in Step 4(a), or request extra withholding in Step 4(c), instead of paying a lump sum in April.
- Compare against your pay stub: multiply year-to-date federal withholding out to a full year and compare it with your estimate.
Frequently Asked Questions
What is the 2026 standard deduction?
$16,100 for single filers and married filing separately, $32,200 for married couples filing jointly and $24,150 for heads of household, per the IRS tax year 2026 inflation adjustments.
What are the 2026 federal tax brackets for a single filer?
10% up to $12,400 of taxable income, 12% to $50,400, 22% to $105,700, 24% to $201,775, 32% to $256,225, 35% to $640,600 and 37% above that.
Will a raise push me into a higher bracket and lower my take-home pay?
No. Only the dollars above a bracket threshold are taxed at the higher rate, so a raise always leaves you with more after federal income tax.
What is the difference between marginal and effective tax rate?
Your marginal rate is the rate on your last dollar of taxable income. Your effective rate is your total tax divided by your income, which is lower because the first dollars are taxed at 10% and 12%.
When should I update my W-4?
After any change that affects your tax: a new job, a second job, marriage or divorce, a new child, or a big change in other income. The IRS Tax Withholding Estimator shows what to enter.
Sources
- IRS, "IRS releases tax inflation adjustments for tax year 2026, including amendments from the One, Big, Beautiful Bill" (irs.gov newsroom).
- IRS Revenue Procedure 2025-32, Section 4.01 tax rate tables (irs.gov/pub/irs-drop/rp-25-32.pdf).
- IRS Tax Withholding Estimator and Form W-4 instructions (irs.gov).
This guide is for education and estimates, not tax advice. Check irs.gov or a tax professional for your own situation.