Question 1

How is federal income tax calculated?

Accepted Answer

Federal income tax is calculated using a progressive tax system. Your income is taxed at different rates depending on which tax bracket it falls into. The IRS publishes tax brackets annually for each filing status (Single, Married Filing Jointly, Head of Household, etc.).

Question 2

What are the 2025 federal tax brackets?

Accepted Answer

For 2025, the federal tax brackets range from 10% to 37%. The specific income thresholds depend on your filing status. For Single filers, the 10% bracket applies to income up to $11,600, while the 37% bracket applies to income over $609,350.

Question 3

What is the standard deduction for 2025?

Accepted Answer

For 2025, the standard deduction is $14,600 for Single filers and $29,200 for Married Filing Jointly. You can choose between the standard deduction or itemized deductions, whichever is higher.

Question 4

What is the difference between effective tax rate and marginal tax rate?

Accepted Answer

Your effective tax rate is the percentage of your total income that you pay in taxes. Your marginal tax rate is the tax rate applied to your last dollar of income. Because of the progressive tax system, your effective rate is typically lower than your marginal rate.

Question 5

How do pre-tax contributions affect my taxes?

Accepted Answer

Pre-tax contributions such as 401(k), IRA, and HSA reduce your taxable income, which can lower your overall tax bill. For example, contributing $20,000 to a 401(k) reduces your taxable income by $20,000.

税率等級	税率	等級内の収入	税金
$0 - $11,925	10.0%	$11,925.00	$1,192.50
$11,925 - $48,475	12.0%	$36,550.00	$4,386.00
$48,475 - $103,350	22.0%	$10,775.00	$2,370.50

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