This guide is written for US citizens, green card holders and dual nationals living in Australia. It covers the 2026 rule changes, line-by-line entries, Australian-dollar conversion, foreign taxes, record-keeping, and where personal and business deductions part ways.
One caution up front: the 2026 Schedule A is still a draft. Tax year 2025 is filed in 2026, and tax year 2026 is filed in 2027, so confirm each figure against the final IRS form before you file.
Key Takeaways
- Use the final 2026 Schedule A and instructions, never a 2025 form or a draft.
- Itemise only when total allowable deductions exceed your standard deduction.
- Australian taxes need a credit-versus-deduction decision before anything goes on Schedule A.
- Convert AUD to USD consistently and keep proof of every rate used.
- Keep receipts, statements and acknowledgements for every figure.
What Schedule A Is and Whether You Need It
What Schedule A does
Schedule A reports itemized deductions that replace the standard deduction on Form 1040. It covers medical expenses, taxes, interest, charitable gifts, casualty losses and a short list of other items.
It is not the same as the neighbouring forms:
- Schedule 1 reports additional income and adjustments to income.
- Schedule 1-A covers qualified tips, overtime, vehicle-loan interest and the enhanced senior deduction. You can claim it with either the standard deduction or itemizing.
- Form 1116 generally calculates the foreign tax credit.
- Schedules C, E and SE handle business, rental and self-employment items.
When to itemize
Compare your total itemized deductions against the standard deduction for your filing status. Rev. Proc. 2025-32 sets these USD amounts:
| Filing status | Tax year 2025 | Tax year 2026 |
|---|---|---|
| Single | $15,750 | $16,100 |
| Married filing separately | $15,750 | $16,100 |
| Married filing jointly / qualifying surviving spouse | $31,500 | $32,200 |
| Head of household | $23,625 | $24,150 |
Age 65+ or blindness adds $1,600 (2025) or $1,650 (2026) per condition for married filers and surviving spouses. For unmarried filers the add-on is $2,000 and $2,050. Those additions do not apply when you itemize.
If you are married filing separately and your spouse itemizes, your standard deduction is zero, so you should itemize too.
Who may need Schedule A
Filers who often benefit from reviewing Schedule A include:
- Homeowners paying mortgage interest
- People with large medical bills
- Regular charitable donors
- Those with qualifying disaster losses
Owning a home or having one deductible expense does not make itemizing worthwhile. Only the total comparison decides.
2026 Schedule A Line-by-Line Instructions
Line references below come from the 2026 draft, so verify them against the final form.
Medical and dental expenses (lines 1-4)
Only unreimbursed expenses above 7.5% of AGI count. Exclude anything:
- reimbursed by insurance,
- paid through a pre-tax FSA,
- paid with tax-free HSA distributions.
Cosmetic surgery and general health club dues are not deductible.
Taxes paid (lines 5-7)
Line 5a takes state and local income taxes or general sales taxes, not both. Line 5b is real estate tax, 5c is personal property tax, and 5e applies the SALT limit.
| Tax year / status | Maximum cap | Phase-down starts (MAGI) | Minimum cap |
|---|---|---|---|
| 2025, except MFS | $40,000 | $500,000 | $10,000 |
| 2025, MFS | $20,000 | $250,000 | $5,000 |
| 2026, except MFS | $40,400 | $505,000 | $10,000 |
| 2026, MFS | $20,200 | $252,500 | $5,000 |
The phase-down rate is 30%.
Foreign real property taxes on a personal home, such as Australian council rates, are not personal Schedule A deductions. Australian GST is not covered by the sales-tax alternative, and line 6 "GST" means generation-skipping tax.
Interest paid (lines 8-10)
- Mortgage interest on acquisition debt is limited to $750,000 ($375,000 MFS). Certain debt from before 16 December 2017 keeps the $1M limit.
- Interest without a Form 1098 goes on line 8b.
- Home-equity interest qualifies only if proceeds bought, built or substantially improved the home.
- For 2026, qualified mortgage insurance premiums return, phasing out above AGI of $100,000 ($50,000 MFS).
- Investment interest is limited to net investment income and generally needs Form 4952.
Charitable contributions (lines 11-15)
Line 11 is cash, 12 is noncash, 13 is the limitation worksheet, 14 is carryover and 15 is the total. Key rules:
- Each gift of $250 or more needs a contemporaneous acknowledgment.
- Noncash gifts over $500 generally need Form 8283. Gifts over $5,000 generally need a qualified appraisal.
- From 2026, itemizers can deduct contributions only above 0.5% of the contribution base.
- Pub. 526 generally excludes foreign charities. Australian registration alone does not make a charity US-qualified.
Casualty, other deductions and total (lines 16-19)
- Line 16 casualty and theft losses use Form 4684. For 2025 they generally require a federally declared disaster. For 2026, certain state-declared disasters are added.
- Line 17a gambling losses are limited to the lesser of 90% of losses or winnings.
- Lines 17b-17k cover items such as estate tax on income in respect of a decedent, claim-of-right repayments and educator expenses.
- Line 18 is the overall limitation for the top bracket.
- The total transfers to line 12e of the 2026 Form 1040 draft.
What Changes for 2026 and What Australian Filers Should Check
Confirm the right tax year
Label every figure by year. Final 2025 instructions are available. The 2026 Schedule A, Form 1040 and Pub. 936 are drafts. Do not file on drafts, and do not carry 2025 line numbers into 2026.
Annual changes at a glance
- Charity floor: 0.5% of the contribution base applies from 2026.
- Non-itemizer gifts: up to $1,000 ($2,000 married filing jointly) in cash, reported on Form 1040 rather than Schedule A.
- Overall limitation: deductions are reduced by 2/37 of the lesser of allowable itemized deductions or taxable income above the start of the 37% bracket. It is 2/37, not 2/35.
- Educators: 2026 expenses move to line 17k when not reported on Schedule 1.
- Miscellaneous deductions: unreimbursed employee expenses stay disallowed.
Schedule A versus Schedule 1-A
Schedule 1-A does not replace Schedule A. Its deductions can sit alongside either choice, but each has its own eligibility tests and phase-outs.
Australia-specific points
Currency. Report in USD. Use the spot rate when income is received, expenses are paid or amounts accrue.
The IRS publishes yearly average rates, but a full-year 2026 rate is not yet shown. Write down the rate and source for each entry.
Foreign taxes. The annual election generally covers all qualified foreign income taxes. You either deduct them on Schedule A line 6 or claim a credit, usually Form 1116 to Schedule 3.
The credit typically wins, and you can switch each year. Article 22 of the US-Australia treaty provides credit relief, with special coordination for US citizens resident in Australia.
Unsettled items.
- Superannuation treatment is not uniform and sits under treaty Article 18.
- Do not assume the Medicare levy is creditable; no primary IRS ruling confirms it.
- Rental, business and pension income may need other forms.
How to Complete and File Schedule A
Gather records first
- A draft Form 1040 with AGI
- Forms 1098 and property-tax statements
- Medical receipts and reimbursement records
- Charity acknowledgements and valuation papers
- Form 4684 and Form 4952 records
- Foreign tax assessments and AUD-to-USD rate evidence
Complete supporting forms, then Schedule A
Finish Form 4684, Form 4952, Form 8283 and any Form 1116 work before you transfer anything. Then enter each category in order on the final 2026 form. Include only amounts paid or treated as paid in the tax year, and keep notes on unusual entries.
Total, compare, attach
- Add the category totals and apply the limits.
- Compare the result with your standard deduction.
- Itemize only if it lowers taxable income (line 19 lets you elect to itemize below the standard amount if needed).
- Reconcile with Form 1040 and confirm no expense is claimed elsewhere.
- Attach the supporting forms.
Foreign-address returns can be e-filed. Overseas filers get an automatic extension to June 15 if conditions qualify, but interest runs from April 15. Form 4868 extends filing to October 15 without removing interest.
Common Mistakes, Non-Deductible Items, and Records
Wrong year or wrong form
Common filing errors include:
- Applying 2025 limits to 2026 returns
- Filing from a draft instead of the final form
- Confusing Schedule A with Schedule 1-A
- Sending totals to an outdated Form 1040 line
Excluded or already-deducted expenses
- Reimbursed medical costs and HSA/FSA-paid costs
- Mortgage principal, home insurance and repairs
- Nonqualifying home-equity interest
- Business or rental costs, which belong on Schedule C or E
- Foreign income taxes claimed without weighing the credit
- Ordinary unreimbursed employee expenses
Weak substantiation
Keep receipts, payment evidence, lender statements, charity acknowledgements, appraisals, disaster records and foreign tax assessments. Per IRS Topic 305, retention is generally 3 years, or 6 years for a substantial omission.
Keep Australian records in a form that supports your USD figures, with translations if needed.
Final Checklist and Professional Support
- Confirm filing status.
- Obtain the final 2026 IRS form.
- Gather records.
- Complete supporting forms.
- Calculate each category.
- Apply 2026 limits.
- Compare with the standard deduction.
- Reconcile Form 1040.
- Retain evidence.
If you have foreign taxes, multiple currencies, self-employment or rental income, treaty questions or large itemized deductions, VJM Global offers US individual return preparation and review for internationally based taxpayers. The approach is personalised, with transparent pricing quoted by scope.
Frequently Asked Questions
Who needs to file Schedule A?
Taxpayers who choose itemized deductions instead of the standard deduction. The choice depends on eligible expenses, filing status and the final 2026 comparison.
What are itemized deductions on Schedule A?
Deductions for medical expenses, taxes, interest, charitable gifts, casualty losses and other listed items. Each has its own thresholds, limits and documentation rules.
What is not deductible on Schedule A?
Personal expenses, reimbursed costs, expenses claimed elsewhere and ordinary employee expenses. Business, rental and foreign-tax items belong on their own forms.
What is the standard deduction on Schedule A for 2025?
It is not entered on Schedule A. For 2025 it is $15,750 single or MFS, $31,500 MFJ and $23,625 head of household. 2026 amounts are higher.
How do I complete Schedule A for the 2026 tax year?
Gather records, finish supporting forms, enter eligible amounts by category, apply limits and total the form. Compare it with the standard deduction and attach it to Form 1040 if itemizing.
Can I claim foreign taxes on Schedule A if I live in Australia?
Not automatically. You can deduct foreign income taxes on line 6 or claim the credit through Form 1116 and Schedule 3. Compare both, and consider treaty advice.
