Introduction
"Gross income from all sources" on Form 1116, especially line 3e, is not your foreign income total, and it is not the foreign tax you paid. It is the denominator used to allocate certain deductions between foreign and non-foreign income.
US taxpayers with Australian ties often struggle with this calculation. Income shows up on payslips, ATO assessments, brokerage statements and US schedules. Those amounts may sit in different Form 1116 categories, and every Australian dollar figure needs converting to US dollars.
This guide walks through the 2025 form: identify all gross income, separate line 3d from line 3e, calculate the ratio, connect it to lines 3f and 3g, and avoid the usual errors.
Key Takeaways
- Worldwide gross income (US and foreign, every category) goes on line 3e.
- Foreign gross income for the category you're filing belongs on line 3d only.
- Divide 3d by 3e for line 3f, round to at least four decimals; that ratio drives line 3g.
- Line 3e is not taxable income (line 18) and doesn't set the final credit.
- Confirm current-year IRS instructions, AUD conversion, and category choices before filing.
How to Calculate Gross Income from All Sources on Form 1116
Step 1: Confirm the taxpayer, tax year and category
Start with the official 2025 Form 1116 and its instructions. Individuals, estates and trusts claiming a foreign tax credit file Form 1116, with a separate form for each applicable category.
The 2025 category boxes are:
- Section 951A category income
- Foreign branch category income
- Passive category income
- General category income (includes employee wages)
- Section 901(j) income
- Certain income re-sourced by treaty
- Lump-sum distributions
Once you select a category, confirm the income is foreign-source under US rules. Don't assume income taxed by Australia is foreign-source for US purposes. Services income is generally sourced where the work is performed, not where the payer sits.
Interest, dividends, rents and property gains each follow their own rules. For US citizens resident in Australia, the treaty's re-sourcing provisions (Article 22(4) and 27(1)(c)) may also matter.
Gather your full Form 1040 with schedules, wage and investment statements, business or rental records and prior-year Form 1116 carryover records before you start.
Step 2: Identify and measure gross income from all sources
The IRS defines line 3e as the total of:
- Gross receipts, reduced by cost of goods sold
- Capital and ordinary gains, before subtracting losses
- All other income, before subtracting deductions
Include US and foreign income across all categories. The same worldwide total repeats in every column of every Form 1116 you file.
Special items to handle correctly:
- Form 2555 excluded income: include it in lines 3d and 3e.
- Qualified dividends and capital gains: include them without the adjustments used elsewhere on the form.
- Partnership or S corporation income: combine your share of Schedule K-3 "Total gross income" with other gross income. Don't use only the net distributive share.
Then reconcile. Match Australian payslips, ATO assessments, brokerage statements and rental records to what you reported on the US return.
Step 3: Calculate line 3d, line 3e and the ratio
Enter foreign gross income for the selected category on line 3d. Calculate worldwide gross income for line 3e on the same tax-year and currency basis.
Then divide: line 3f = line 3d ÷ line 3e, rounded to at least four decimal places and capped at 1. The IRS example: 0.8756782 becomes 0.8757.
Line 3g equals line 3c (itemised or standard deduction plus other deductions) multiplied by line 3f. Line 3e is only the denominator.
Hypothetical example, based on Pub. 514 (2025): A single taxpayer has $75,000 of US gross dividends and a $220,000 gross share of foreign partnership income.
Worldwide gross income is $295,000, and unrelated itemised deductions are $34,000.
- Line 3f: $220,000 ÷ $295,000
- Line 3g: roughly $220,000 ÷ $295,000 × $34,000 = $25,356
The partnership's net loss doesn't shrink the figure. Gross income is what counts. This is an illustration, not a result for any individual.
Step 4: Reconcile with Part I and Part III
Line 3g feeds line 6, and line 7 is foreign-source taxable income after allocated deductions:
- Line 6 = line 2 + line 3g + lines 4a, 4b and 5
- Line 7 = line 1a − line 6
Line 7 moves into Part III. Line 18 is a different measure: roughly taxable income, with prescribed adjustments, used as the limitation denominator (line 19 = line 17 ÷ line 18, capped at 1).
| Measure | Line 3e | Lines 7/17 | Line 18 |
|---|---|---|---|
| Scope | All sources and categories | Foreign-source, by category | Overall limitation denominator |
| Basis | Gross income | After allocated deductions | Taxable-income-based |
Cross-check each category separately and confirm the same line 3e total appears on every form.
When the Calculation Applies and What You Need
When this calculation applies
Line 3e matters whenever you file Form 1116. That usually means foreign-source wages, business, rental or investment income, income from several countries, carryovers or multiple separate limitation categories. Paying foreign tax alone isn't the filing trigger.
You can skip Form 1116 under the IRC 904(j) election only if:
- All foreign-source gross income is qualified passive income
- Income and taxes appear on payee statements such as 1099-DIV or 1099-INT
- Creditable taxes are no more than $300 ($600 jointly)
Estates and trusts can't use it, and the election carries trade-offs for carryovers.
Form 1116 also doesn't replace FBAR or Form 8938 reporting. Both may apply independently. For filers living outside the United States, Form 8938 starts at more than $200,000 at year end for unmarried filers. The FBAR threshold is over $10,000 aggregate in a calendar year.
Documents and tools
Gather:
- Form 1040 and schedules
- Australian payslips, ATO assessments and withholding records
- Brokerage, rental and business records
- Partnership or S corporation schedules (K-3)
- Prior-year carryover schedules
Build a worksheet per income item covering:
- Gross amount, country and separate limitation category
- AUD amount and USD conversion
- Related deductions
- Where the item lands on the return
Verify each levy before treating it as creditable. Foreign tax must be imposed on you, legally and actually paid or accrued, and an income tax or a tax in lieu of income tax.
Social security taxes under a US totalisation agreement are excluded. GST, Medicare levy and superannuation need individual review.
Keep exchange-rate sources, assessments and reconciliations in case the IRS asks.
Key Parameters That Affect the Calculation
Gross versus net income
Entering net or taxable income understates line 3e, skews line 3f and shifts deductions improperly between US and foreign income. Only cost of goods sold reduces business receipts.
Income category
Wages fall in the general category, and most investment income is passive. Foreign branch and section 951A income each have separate rules. Misclassifying income produces the wrong line 3d amount and the wrong limitation, even when total income is right.
Form 2555 exclusions
Excluded earnings (up to $130,000 for 2025) stay in lines 3d and 3e. But IRC 911(d)(6) bars a credit for foreign taxes allocable to excluded income, so those taxes must be removed from the taxes available for credit.
Currency conversion
- Income items: spot rate when received, paid or accrued; a consistently used posted rate is generally accepted.
- Tax paid or withheld: generally the payment-date rate.
- Accrued tax: generally the year's average if paid within 24 months after year-end.
- The IRS yearly average for 2025 is 1.551 AUD per USD, so AUD ÷ 1.551 = USD. It doesn't override payment-date rules.
Deductions
Deductions don't reduce line 3e. They affect line 3g, line 7 and the later limitation.
Common Mistakes and Troubleshooting
Common mistakes
- Entering taxable income, net profit or foreign-source taxable income on line 3e
- Listing only Australian income and omitting US-source or other-category income
- Netting capital losses or expenses against gross income first
- Using last year's rules without checking current instructions
Troubleshooting
- Line 3e won't reconcile: trace each item from Form 1040, schedules and foreign statements. Look for omissions, duplicates, cost-of-goods-sold treatment and gains netted against losses.
- Line 3f or 3g looks off: recalculate 3d and 3e independently, check the four-decimal rounding and confirm deductions were allocated after the ratio.
- Credit doesn't equal foreign tax paid: that's normal. Review category, creditable status, line 7, line 18, the Part III limitation, conversion, carryovers and any Form 2555 reduction.
- Forms disagree: confirm the same line 3e total is on each, and that income isn't duplicated or moved between categories.
Alternatives to Calculating Gross Income on Form 1116
Simplified foreign tax credit election
If you meet every condition, you can claim the credit directly without Form 1116. It suits small amounts of passive income reported on payee statements. The trade-off: no carryovers into or out of the election year, so check current rules first.
Form 2555 and the foreign earned income exclusion
For someone living and working in Australia, the exclusion may outperform the credit depending on your facts. You generally can't claim credit for taxes on excluded income, so model both before filing.
Publication 54 explains the general preference for credits over deductions. It does not compare the foreign tax credit with Form 2555.
Software, professional preparation or cross-border review
Consider professional help when your return involves:
- Multiple countries or AUD source records
- Several income categories, Form 2555 or carryovers
- Foreign businesses or partnerships
Software speeds data entry but still relies on your sourcing and classification. A professional review costs more, yet it reconciles Form 1116 with the full return.
VJM Global's US-compliant tax professionals can review Form 1116 calculations for eligible Australian-based US taxpayers and businesses. Its Foreign Tax Credit Relief service identifies eligible credits and aligns filings with Form 1116, though no particular tax result is guaranteed.
Conclusion
Line 3e demands a full gross-income inventory across US and foreign sources, correct categories and a clear line between 3e, 3d, 3f, 3g and the Part III limitation.
Most errors come from:
- Using net or taxable income instead of gross
- Omitting US-source items
- Double counting income
- Applying outdated rules
- Failing to support currency and deduction allocations
Check the latest IRS Form 1116 instructions before filing.
Frequently Asked Questions
Do I need to file Form 1116 for foreign tax paid?
Not always. It depends on your eligibility, income categories, tax amount, payee statements and whether every condition of the simplified election is met.
When do I need to fill out Form 1116?
When you claim a foreign tax credit and can't use the simplified election, such as with foreign wages, business income, multiple categories or carryovers.
What is Form 1116 on a tax return?
It's the "Foreign Tax Credit (Individual, Estate, or Trust)" form. It calculates the allowable credit for qualifying foreign income taxes and attaches to your US return.
What categories of income are listed on Form 1116?
The 2025 form lists section 951A, foreign branch, passive, general, section 901(j), treaty re-sourced income and lump-sum distributions. Confirm against the current form.
