Como Calcular Los Taxes Del 2018 En Usa

Calculating your 2018 US taxes involves understanding federal income tax brackets, state/local taxes, deductions, and credits. This guide explains the process step-by-step, with a built-in calculator to simplify the process.

Federal Income Tax Calculation

The federal income tax is calculated using progressive tax brackets. For 2018, the standard deduction for single filers was $12,000, and for married filing jointly it was $24,000. Here's how the calculation works:

Federal Tax Formula

Taxable Income = Gross Income - Deductions - Standard Deduction

Federal Tax = Taxable Income × Tax Rate

Where Tax Rate is determined by the tax bracket.

For example, if your taxable income falls into the 24% bracket, you'll pay 24% of that income. The 2018 federal tax brackets were:

Taxable Income	Tax Rate
$0 - $9,525	10%
$9,526 - $38,700	12%
$38,701 - $82,500	22%
$82,501 - $157,500	24%
$157,501 - $200,000	32%
$200,001 - $500,000	35%
$500,001+	37%

State and Local Taxes

State and local taxes vary significantly by location. Some states have flat income tax rates, while others use progressive brackets similar to the federal system. Additionally, many states impose sales tax, property tax, and other local taxes.

Note: State tax rates and rules changed frequently. For exact 2018 rates, consult your state's tax agency or use the calculator below.

Common state income tax rates in 2018 ranged from 0% (for example, Washington and Oregon) to over 10% in states like California and New York.

Common Deductions and Credits

Deductions reduce your taxable income, while credits directly reduce your tax owed. Common deductions include:

Standard deduction
Mortgage interest deduction
State and local tax deductions
Retirement contributions
Student loan interest

Common credits include:

Earned Income Tax Credit (EITC)
Child Tax Credit
American Opportunity Credit
Lifetime Learning Credit

Worked Example

Let's calculate taxes for a single filer with $50,000 gross income in a state with a 5% income tax rate.

Subtract the standard deduction: $50,000 - $12,000 = $38,000 taxable income
Determine federal tax bracket: $38,000 falls in the 22% bracket
Calculate federal tax: $38,000 × 22% = $8,360
Calculate state tax: $38,000 × 5% = $1,900
Total tax: $8,360 + $1,900 = $10,260

This is a simplified example. Actual tax calculations may vary based on deductions, credits, and other factors.

Frequently Asked Questions

When were 2018 tax forms due?: Tax forms for 2018 were due by April 17, 2019, with extensions available.
What was the standard deduction for 2018?: The standard deduction was $12,000 for single filers and $24,000 for married filing jointly.
Did 2018 have any major tax law changes?: Yes, the Tax Cuts and Jobs Act of 2017 significantly changed tax rates and deductions for 2018.
How do I estimate my 2018 taxes before filing?: Use the calculator on this page or consult a tax professional for an estimate.
Where can I find my 2018 tax records?: Keep records from your employer, bank, and other financial institutions for at least 3 years.