Start with the calendar. Tax year 2026 belongs to the 2027 filing season, and the ordinary deadline is 15 April 2027. The 2025 return filed in 2026 is a different animal.
This article traces the major Form 1040 milestones, explains the latest changes tied to the One Big Beautiful Bill Act (OBBBA), and flags what U.S. taxpayers in Australia should check. Amounts are in U.S. dollars unless stated.
Key Takeaways
- Form 1040 evolved through consolidation, added schedules, and new taxpayer categories.
- OBBBA mixes permanent rules with deductions that run only for 2025-2028.
- U.S. taxpayers in Australia may owe returns in both countries, plus foreign account reports.
- Final IRS instructions override any summary, including this one.
What Is Form 1040 and How Has Its Structure Evolved?
Form 1040 is the primary U.S. individual income tax return. Taxpayers use it to report income, claim deductions and credits, calculate tax and reconcile payments or refunds.
Most rule changes don't need a brand-new return. They need a new line, a revised schedule or an attachment.
Which forms you file depends on filing status, income sources, age, self-employment, investments and international circumstances:
- Form 1040-SR: optional senior version of the return
- Schedule 1: additional income and adjustments
- Schedule 2: additional taxes
- Schedule 3: additional credits and payments
- Schedules A, B, C, D and SE: itemised deductions, interest, business income, capital gains and self-employment tax
- Information returns: Forms W-2 and the 1099 series from payers
Compare historical changes by purpose: income reporting, deductions, credits, tax calculation and payment reconciliation. Not every annual redesign signals a new tax system. Most are the same system with new line numbers.
Major Form 1040 Changes Over the Years
Before the modern structure
Simpler filers once used Forms 1040A and 1040EZ, while more complex filers used the full Form 1040. Both short forms stopped being available for tax year 2018, when IRS guidance confirmed everyone would file the redesigned Form 1040.
The post-TCJA redesign
The Tax Cuts and Jobs Act changed deductions, exemptions, brackets and credits. The 2018 form responded with six new numbered schedules that moved less-common items off the main return, while the existing lettered schedules continued.
That six-schedule list describes 2018 only. Current schedules should be read from current IRS instructions.
The personal exemption amount fell to zero for 2018-2025. OBBBA removed the sunset, so it stays zero in 2026.
The introduction of Form 1040-SR
Form 1040-SR first appeared for tax year 2019. Taxpayers aged 65 or older may use it. It offers larger print and a standard-deduction chart, but the lines, checkboxes and calculations mirror Form 1040. It's a presentation choice, not a separate tax system.
Annual adjustments and temporary provisions
Inflation adjustments, expiring provisions and new legislation change instructions without changing the form's job. Revenue Procedure 2025-32, for example, sets 2026 inflation-adjusted amounts and reflects OBBBA.
Some provisions run for a few years only. Four new deductions apply for 2025-2028. Don't carry last year's deduction or credit forward automatically.
The transition to the 2026 forms
Draft versions of the 2026 Form 1040 are marked "DRAFT - DO NOT FILE". Enacted law can be verified independently of a draft, but final line numbers should wait for the final form and instructions.
Major 2026 Income Tax and Form 1040 Updates to Review
Permanent extensions and baseline changes
OBBBA (Public Law 119-21, signed 4 July 2025) removed relevant TCJA sunsets. The 10%, 12%, 22%, 24%, 32%, 35% and 37% rates continue, with inflation-adjusted brackets.
| Provision | 2025 | 2026 |
|---|---|---|
| Standard deduction, single / MFS | $15,750 | $16,100 |
| Standard deduction, married filing jointly | $31,500 | $32,200 |
| Standard deduction, head of household | $23,625 | $24,150 |
| Child Tax Credit per child | $2,200 | $2,200 |
Standard deduction figures exclude age and blindness additions. From 2025, Child Tax Credit claimants also need a valid employment-authorised SSN, with extra rules for joint returns.
Keep three categories separate: deductions reduce taxable income, exclusions remove income, and credits reduce tax directly.
New deductions for specific taxpayer groups
Four temporary deductions apply for 2025-2028:
| Deduction | Maximum | Phaseout begins (non-joint / joint MAGI) |
|---|---|---|
| Qualified tips | $25,000 per return | $150,000 / $300,000 |
| Qualified overtime | $12,500 ($25,000 joint) | $150,000 / $300,000 |
| Vehicle-loan interest | $10,000 | $100,000 / $200,000 |
| Senior deduction | $6,000 per person | $75,000 / $150,000 |
Overtime covers only the premium above regular pay required under the U.S. Fair Labor Standards Act. Vehicle loans must originate after 31 December 2024 and apply to a new personal-use vehicle with U.S. final assembly.
The IRS created Schedule 1-A, Additional Deductions for the 2025 return, consolidating all four. Australian payroll labels alone don't establish eligibility for these U.S. deductions.
Families, charitable giving and itemizers
- Care credit: the Child and Dependent Care Credit's top percentage rises from 35% to 50% from 2026, with a maximum credit of $1,500 for one person or $3,000 for two or more
- Non-itemizer giving: up to $1,000 ($2,000 joint) of qualifying cash gifts from 2026
- Itemizer floor: charitable deductions face a 0.5% floor from 2026
Taking the standard deduction means no Schedule A and lighter records. Itemizing demands receipts for every deduction claimed, so run both numbers before choosing.
SALT, AMT, energy credits and limits
- SALT cap: $40,000 in 2025 and $40,400 in 2026, phasing down at 30% of MAGI above $500,000 / $505,000, with a $10,000 floor. It returns to $10,000 in 2030
- AMT exemption (2026): $90,100 single, $140,200 joint
- Itemized limit: from 2026, a new reduction caps the benefit of affected deductions for 37%-bracket filers at roughly 35 cents per dollar
Clean-energy credits now end on different triggers. Vehicles acquired after 30 September 2025 get no credit. Section 25C property placed in service after 31 December 2025, and 25D expenditures after that date, get no credit. Refuelling property placed in service after 30 June 2026 is also ineligible. "Acquired," "placed in service" and "expenditures" aren't interchangeable.
Reporting changes and records
Information-return thresholds govern what payers send, not what you owe.
- Form 1099-K: back to more than $20,000 and more than 200 transactions
- Forms 1099-NEC/MISC: the general threshold rises from $600 to $2,000 for payments after 31 December 2025
A missing form doesn't erase income. Keep your own records and reconcile them against IRS data.
What Form 1040 Changes Mean for Taxpayers in Australia
Who may have U.S. filing obligations
U.S. citizens and resident aliens generally use the same filing rules abroad as at home. Living in Australia doesn't end that. Net self-employment earnings of $400 or more can trigger filing by themselves.
Don't assume a blanket answer. Citizenship, residency, income, filing status and treaty position all matter. Check current IRS rules.
Worldwide and foreign income
Australian wages, business income, investments, pensions and rental income may all belong on Form 1040, each with its own treatment.
- Foreign earned income exclusion: up to $132,900 for 2026, claimed on Form 2555
- Foreign tax credit: claimed on Form 1116, with no credit for tax on excluded income
Check eligibility for each rather than claiming both automatically. IRS guidance gives abroad filers an automatic two-month extension to 15 June, though interest still runs from 15 April.
Coordinating U.S. and Australian obligations
A U.S. return doesn't replace an Australian one. Australia's income year runs 1 July to 30 June, while the U.S. year is normally the calendar year. Residency rules, deductions and conventions differ too.
The 1982 U.S.-Australia treaty and 2001 protocol include a saving clause that generally preserves U.S. taxation of citizens. Australia's foreign income tax offset is separate from the U.S. Form 1116 credit.
Superannuation needs particular care. No blanket exemption exists, and contributions, earnings and distributions should each be assessed on their own terms.
Foreign accounts, currency and records
- FBAR: required when foreign accounts exceed $10,000 in aggregate at any time
- Form 8938: for taxpayers abroad, over $200,000 at year-end or $300,000 at any time (non-joint); $400,000 / $600,000 for joint filers
- Managed funds: may trigger Form 8621 reporting if they're PFICs, though not automatically
Currency has no single official IRS rate. The IRS generally uses the transaction-date spot rate and accepts consistently applied posted rates.
Keep this checklist:
- Original-currency amounts
- Conversion method used
- Account balances
- Australian tax assessments
- Withholding records
- Evidence for credits or exclusions
When cross-border support makes sense
Multiple countries, foreign investments, self-employment, business ownership or treaty questions justify coordinated professional review. VJM Global supports cross-border tax compliance and accounting for U.S. taxpayers and businesses with Australia-related operations, subject to engagement scope and current professional advice.
How to Prepare for the Latest Form 1040 Filing
Confirm the tax year and forms
Download the final Form 1040, schedules and instructions for the correct year. Don't reuse a prior-year return or rely on a draft. Keep a change log of new, extended, expired or restricted provisions that apply to your situation.
Gather documents first
- Income statements and 1099s
- Deduction, credit and charitable records
- Retirement and investment statements
- Australian income and tax-paid evidence
- Foreign account details
Business owners should reconcile bookkeeping, expenses and payments before transferring figures to schedules. Under IRS retention rules, keep records:
- 3 years in general
- 6 years if you omitted more than 25% of income
- Indefinitely if no return was filed
Review, retain and coordinate
Check names, taxpayer identification numbers, filing status, dependants, bank details and attachments before submitting. Keep the filed return and source records. If the same income or entity affects the U.S. and Australia, align your U.S. filing with Australian reporting and get professional help.
Frequently Asked Questions
What are the key changes in the new income tax rules for 2026?
Permanent changes include continued rates, a $16,100 single standard deduction and the SALT cap increase. Tips, overtime, vehicle-interest and senior deductions are temporary. Final IRS instructions determine reporting.
What are the main tax changes introduced by the One Big Beautiful Bill?
It removed TCJA sunsets, added four temporary deductions, raised the care credit, changed itemizer rules and the SALT cap, ended several energy credits and changed 1099 thresholds.
What is the new $6,000 tax deduction for seniors?
Taxpayers aged 65+ with a qualifying SSN may claim up to $6,000 each ($12,000 if both joint filers qualify) for 2025-2028. It phases out above $75,000 / $150,000 MAGI and is reported on Schedule 1-A.
How has Form 1040 changed over the years?
Forms 1040A and 1040EZ ended after 2017. The 2018 redesign added numbered schedules, Form 1040-SR arrived for 2019, and lines and instructions update every year.
What is the difference between Form 1040 and Form 1040-SR?
Both calculate tax under the same rules. Form 1040-SR is optional for those 65+, with larger print and a standard-deduction chart.
Do U.S. taxpayers living in Australia need to file Form 1040?
Often yes, depending on citizenship, residency, income and filing status. U.S. duties sit alongside Australian returns and possible FBAR or Form 8938 reporting.
