2018 1040 Tax Tables and Federal Tax Rates

Introduction

The Tax Cuts and Jobs Act (TCJA) reshaped U.S. individual income tax for 2018. Rates dropped, the standard deduction nearly doubled, personal exemptions went to $0, and Form 1040 was redesigned.

Two dates trip people up. The 2018 tax year ran to December 31, 2018, but most returns were due April 15, 2019. Anyone checking an old figure, or filing a late return now, needs the 2018 rules and not the current ones.

This guide covers the 2018 brackets, Tax Table lookups, the Form 1040 flow, deductions, credits and cross-border issues for Australian-based taxpayers with U.S. obligations. Verify every figure against the official IRS 2018 instructions before filing.

Key Takeaways

• U.S. income tax is progressive, so each slice of taxable income is taxed at its own rate.
• Your tax comes from filing status plus taxable income, not gross income.
• The 2018 standard deduction was $12,000 (Single) and $24,000 (joint).
• Tax tables exclude state tax, payroll tax and self-employment tax.

2018 Federal Tax Rates and IRS Tax Tables

The 2018 rates were 10%, 12%, 22%, 24%, 32%, 35% and 37%. They apply to taxable income, meaning what remains after adjustments and deductions. The thresholds below come from the 2018 Form 1040 instructions.

2018 rate schedule by filing status

Rate	Single	Married filing jointly	Married filing separately	Head of household
10%	Up to $9,525	Up to $19,050	Up to $9,525	Up to $13,600
12%	to $38,700	to $77,400	to $38,700	to $51,800
22%	to $82,500	to $165,000	to $82,500	to $82,500
24%	to $157,500	to $315,000	to $157,500	to $157,500
32%	to $200,000	to $400,000	to $200,000	to $200,000
35%	to $500,000	to $600,000	to $300,000	to $500,000
37%	Over $500,000	Over $600,000	Over $300,000	Over $500,000

A qualifying widow(er) uses the married filing jointly schedule. Never read from the wrong filing-status column: a joint filer's 12% band runs to $77,400, while a single filer's ends at $38,700.

Tax Tables versus rate schedules

The Tax Table and the rate schedule give the same answer by different routes.

• Tax Table: a lookup for taxable income under $100,000. You find your income row and filing-status column. The Browns, filing jointly with $25,300 taxable income, read $2,658.
• Tax Computation Worksheet: used at $100,000 or more, applying the rate schedule directly.
• Special worksheets: required for qualified dividends, capital gains or foreign earned income.

What changed under the TCJA

The TCJA introduced the new rate structure, a higher standard deduction and a $0 personal exemption. The IRS inflation guidance also notes the law changed how annual inflation adjustments are calculated. Use 2018 figures only, never current-year ones.

How to Use the 2018 Tables with Form 1040

Determine filing status and taxable income

Pick your filing status first. Marital status on December 31, dependents, and household circumstances decide it.

Then follow the income path on the 2018 Form 1040:

1. Lines 1-6: total income.
2. Line 7: adjusted gross income (AGI), after adjustments.
3. Line 8: standard or itemized deduction.
4. Line 9: qualified business income deduction.
5. Line 10: taxable income.

The table applies to line 10, never to salary or total receipts. Excluded income, such as amounts under the foreign earned income exclusion, doesn't enter taxable income.

Read the correct table entry

1. Confirm taxable income is under $100,000.
2. Find the row where income is "at least" and "but less than" your figure.
3. Move across to your filing-status column.
4. Enter the tax shown on line 11.

At $100,000 or more, or where a special worksheet applies, follow the instructions for that calculation instead.

Calculate tax progressively

Take a hypothetical single filer with $50,000 taxable income (illustrative only; actual filers use the official table):

• 10% on the first $9,525 = $952.50
• 12% on $9,525 to $38,700 ($29,175) = $3,501.00
• 22% on $38,700 to $50,000 ($11,300) = $2,486.00

Total: $6,939.50. The marginal rate is 22%, the rate on the last dollar. The effective rate is tax divided by taxable income, about 13.9%. Entering the 22% bracket didn't tax everything at 22%.

Finish the calculation

Line 11 tax is reduced by nonrefundable credits (lines 12-13), then increased by other taxes (line 14) to give total tax on line 15.

Compare that figure with withholding, estimated payments, and refundable credits to see whether you owe or get a refund. Check line numbers against the original 2018 form, since later years differ.

Final verification checklist

• Confirm filing status matches your circumstances
• Verify taxable income and table range are correct
• Match deductions, credits, and payments to your records
• Ensure signatures are in place

2018 Standard Deduction, Exemptions, Credits and Other Adjustments

Standard deduction and personal exemption

Filing status	2018 standard deduction
Single	$12,000
Married filing jointly	$24,000
Married filing separately	$12,000
Head of household	$18,000
Qualifying widow(er)	$24,000

Taxpayers aged 65 or older, or blind, add $1,300 per condition ($1,600 for Single and Head of household). Itemise only if your itemised deductions exceed the standard amount.

The personal exemption for you, your spouse and dependants was $0 for 2018 under the TCJA.

Credits and income-based relief

A deduction reduces taxable income. A credit reduces tax directly. Per the IRS, the main 2018 credits were:

• Child Tax Credit: up to $2,000 per child, with up to $1,400 refundable. Phase-out begins at $200,000 MAGI ($400,000 joint).
• Credit for Other Dependents: up to $500.
• Earned Income Tax Credit: maximums of $3,461, $5,716 and $6,431 for one, two, and three or more children. Investment income must not exceed $3,500.
• American Opportunity Credit: up to $2,500, 40% refundable.
• Lifetime Learning Credit: up to $2,000, nonrefundable.

Other taxes

The tax tables do not cover every liability. Additional calculations include:

• Alternative Minimum Tax: exemption of $70,300 (Single), $109,400 (joint).
• Net Investment Income Tax: 3.8% above $200,000 (Single) or $250,000 (joint) MAGI.
• Self-employment tax: 15.3% on net earnings, with a Social Security wage base of $128,400.

Filing a 2018 Return from Australia: Records, Cross-Border Issues and Professional Help

The 2018 Form 1040 and supporting schedules

For 2018, Forms 1040A and 1040EZ were discontinued. The redesigned Form 1040 relies on six numbered schedules covering additional income and adjustments, tax, credits, other taxes, other payments and foreign address details.

Gather these records:

• Wage and income statements
• Investment and brokerage records
• Self-employment income and expenses
• Deduction evidence
• Prior-year returns
• Foreign income, tax paid and foreign account details

Cross-border considerations

U.S. citizens and resident aliens generally report worldwide income, even while living abroad. Living in Australia doesn't by itself end that obligation.

Excluded income still counts when testing whether you must file. For 2018, the gross-income thresholds included $12,000 (Single, under 65) and $24,000 (joint, both under 65).

Key points for Australian-based filers:

• Deadline: eligible taxpayers abroad got an automatic extension to 17 June 2019, but tax was still due 15 April 2019.
• Relief: the Foreign Earned Income Exclusion reached $103,900 (Form 2555). The Foreign Tax Credit (Form 1116) is a separate calculation.
• Account reporting: an FBAR is due when foreign accounts exceed $10,000 combined. Form 8938 applies above $200,000 at year-end for unmarried filers abroad ($400,000 joint).
• Treaty: the 1982 U.S.-Australia treaty has dual-residency tie-breaker rules, but its saving clause generally preserves U.S. taxation of citizens.
• Currency: convert Australian dollars using the rate applicable when income was received or accrued, or an appropriate yearly average.

Nonresident aliens with U.S. income file Form 1040-NR instead.

When professional assistance may be appropriate

Get a qualified tax professional involved if you have:

• Residence in more than one country
• Self-employment income
• Foreign investments
• Amended or late historical returns
• Missing records
• Doubt about your filing status

Late filing may bring penalties and interest, and the refund window for 2018 closed in 2022. Streamlined procedures exist for non-willful non-compliance.

VJM Global provides international tax, accounting and compliance support through U.S.-compliant professionals, including Form 1040 and 1040-NR preparation. Scope and pricing depend on your circumstances.

Frequently Asked Questions

What were the federal income tax brackets for 2018?

The rates were 10%, 12%, 22%, 24%, 32%, 35% and 37%. Thresholds depended on filing status and taxable income.

What was the federal standard deduction in 2018?

It was $12,000 for Single and married filing separately, $18,000 for head of household, and $24,000 for joint filers and qualifying widow(er)s. Personal exemptions fell to $0.

What are the IRS tax tables?

They let you look up the tax on taxable income under $100,000 by filing status. The result is a dollar amount, not a rate.

How do I use the 2018 tax tables for Form 1040?

Confirm filing status, take taxable income from line 10, find the matching row, and read across to your column. Follow the original 2018 instructions.

What changed on Form 1040 for the 2018 tax year?

Forms 1040A and 1040EZ were discontinued. The redesigned Form 1040 uses supporting schedules for additional items.