Many Australian businesses with US-connected entities, partnerships, or foreign corporation filings struggle with figuring out which address applies to them. The correct answer depends on your return type, your tax classification, and whether you're filing from overseas.
This article walks through a practical decision process: confirm you're eligible for Form 7004, pick your filing method, verify the current IRS mailing address, hit the original return deadline, and pay any estimated tax owed. Addresses and rules change, so always cross-check against the IRS instructions before you file.
Key Takeaways
- Form 7004 extends your filing deadline, not your payment deadline; tax owed is still due on the original date
- Paper filers must check the IRS's current "Where to File Form 7004" page rather than reuse a prior-year address
- The deadline is the original due date of the return being extended, adjusted for weekends and holidays
- Australian businesses should confirm e-file eligibility and check whether a separate US state extension applies
What Is Form 7004 and Who Can Use It?
Form 7004 is the IRS application for an automatic extension to file certain business income tax, information, and other returns. It doesn't require advance approval. If you file it correctly and on time, the extension is granted automatically.
Commonly eligible filers include:
- Partnerships and multi-member LLCs taxed as partnerships (Form 1065)
- C corporations (Form 1120) and foreign corporations (Form 1120-F)
- S corporations (Form 1120-S)
- Estates and trusts (Forms 1041, 1041-N, 1041-QFT)
- Various other specified returns, including Forms 1042, 1066, and 3520-A
Two exceptions trip up a lot of business owners:
- Individuals use Form 4868, not Form 7004, for their personal extension
- Single-member LLCs treated as disregarded entities generally follow the owner's extension process (individual or corporate) rather than filing Form 7004 independently, unless a specific foreign-owned disregarded entity rule applies, which we'll cover shortly
Each return code on Form 7004 corresponds to a specific return. Common examples include:
- Partnership filing Form 1065: code 09
- C corporation filing Form 1120: code 12
- Foreign corporation filing Form 1120-F: code 15
These codes aren't interchangeable, and the IRS periodically revises the full list. Verify the current codes in the instructions rather than relying on an older list. If your business has more than one eligible return, you'll generally need a separate Form 7004 for each one.
Should You E-File or Mail Form 7004?
Most Form 7004 extensions can be filed electronically through the IRS's Modernized e-File (MeF) system, using an authorised e-file provider. A smaller number of return types are excluded from e-filing in certain tax years, so this isn't a given for every filer.
When E-Filing Works
If your return type is supported, e-filing is typically faster and gives you an immediate acceptance record. To e-file:
- Confirm your return type is eligible for MeF under current IRS guidance
- Select the correct return code and enter accurate taxpayer and tax-year details
- Submit before the original deadline
- Keep the electronic acknowledgement — this is your proof of a timely, accepted filing
Don't treat a submitted transmission as a filed extension. Only an accepted acknowledgement confirms the IRS has your request.
When You Need to Mail It
Some returns and circumstances are specifically excluded from e-filing, including a handful of less common forms and certain special situations (name changes, reasonable-cause submissions, and a few others). If paper filing applies to you:
- Mail the completed form to the correct address early enough to arrive by the deadline
- Keep a complete copy of the form
- Retain mailing or courier tracking as delivery evidence
For Australian businesses, the complexity usually isn't the form itself. The harder part is figuring out whether your US entity qualifies for e-filing, what your foreign-company status means for the return, and how to estimate tax owed before the full return is complete.
This is where firms like VJM Global come in. Our tax compliance and accounting team works alongside Australian businesses with US filing obligations to coordinate the cross-border accounting and documentation needed to support an accurate extension. We're not positioning ourselves as an IRS e-file provider here. Rather, we help get the numbers and classification right before the form ever reaches the IRS.
Where to Mail Form 7004
If you're paper filing, the only reliable source is the IRS's Where to File page or the current Form 7004 instructions. Don't reuse an address from an old blog post, a prior-year form, or a different tax return. IRS processing centres and addresses change.
What Determines Your Address
Three factors decide which address applies:
- The exact return being extended (and its Form 7004 code)
- Your location or foreign status — domestic entity, foreign corporation, or foreign-owned disregarded entity
- Asset thresholds for certain return types, which can shift routing even within the same form
A Practical Lookup Process
- Identify the exact return you're extending and its matching Form 7004 code
- Confirm whether you're filing as a US entity, foreign corporation, partnership, or another eligible filer type
- Open the current IRS "Where to File Form 7004" page and compare it against the form instructions
- Check whether enclosing a payment changes the address or remittance process
- Re-check the address immediately before mailing — don't rely on a lookup from months earlier
Addresses That Commonly Apply to Overseas Filers
| Return Type | Mailing Address |
|---|---|
| 1120-F, 1042, 1120-FSC, 3520-A, 8804 (any location) | Internal Revenue Service, P.O. Box 409101, Ogden, UT 84409 |
| 1065, 1120, 1120-S, 1041, 1066 filed from a foreign country | Internal Revenue Service, P.O. Box 409101, Ogden, UT 84409 |
| Foreign-owned US disregarded entity (pro forma 1120, code 12) | Internal Revenue Service, 1973 Rulon White Blvd, M/S 6112, Attn: PIN Unit, Ogden, UT 84201, or fax 855-887-7737 |
The last row is a genuinely common scenario for Australian-owned entities: a foreign-owned US disregarded entity with a pro forma Form 1120 filing obligation doesn't use the standard address table at all. It uses a dedicated fax or mail destination, and the form must be marked "Foreign-owned U.S. DE" across the top. Using the ordinary table here can send your extension to the wrong place entirely.
Important for Australian filers: follow the taxpayer instructions for foreign filers on the form itself. Don't mail to a US state address just because your business has US customers or revenue. Location-based routing depends on your entity's actual filing status, not where your customers sit.
Form 7004 Deadline, Tax Payment, and Extension Period
Form 7004 must generally be filed by the original due date of the return being extended, not by whenever you hope to have the actual return finished.
Typical Original Deadlines
| Return | Calendar-Year Deadline | Fiscal-Year Rule |
|---|---|---|
| Form 1065 (partnerships) | 15 March | 15th day of the third month after year-end |
| Form 1120-S (S corporations) | 15 March | 15th day of the third month after year-end |
| Form 1120 (C corporations) | Generally 15 April | Generally 15th day of the fourth month |
When the deadline falls on a weekend or federal holiday, it shifts to the next business day.
Fiscal-year taxpayers, short tax years, and certain foreign corporations without a US office face different original due dates. Confirm your specific date against current IRS guidance rather than assuming the calendar-year rule applies.
The Extension Period Isn't Always Six Months
The standard extension is generally six months, but exceptions exist:
- Estates and trusts filing Form 1041 (other than bankruptcy estates) typically receive 5.5 months
- Certain June 30 fiscal-year C corporations have historically received a longer extension under transitional rules, though this has been narrowing in recent tax years
- Foreign corporations without a US office or place of business have a later original due date to begin with, which isn't the same as receiving a longer extension
Filing Relief Is Not Payment Relief
This is the single most misunderstood part of Form 7004. The extension gives you more time to file; it does not give you more time to pay. You're expected to estimate your balance due and pay it by the original deadline.
Miss that payment, and penalties can apply. According to the IRS's failure-to-file penalty guidance, late-filing penalties for partnership and S corporation returns are charged per partner or shareholder, per month, for up to 12 months, even when no entity-level tax is owed.
Late-payment penalties and interest apply separately, so an accepted extension doesn't protect you from either if the tax itself goes unpaid.
Information Needed Before Filing Form 7004
Before you fill in a single field, gather the basics:
- Legal business name exactly as it appears in IRS records
- Mailing address, including correct foreign-address formatting if filing from Australia
- EIN or other permitted identifying number
- Tax year (calendar or fiscal, including start and end dates for short years)
- The specific return being extended and its matching return code
Getting the return code wrong isn't a minor slip: it can mean the wrong return gets extended, or none at all. There's no separate "wrong code" penalty listed in the instructions, but an unextended return is treated exactly like one filed without any extension request.
You'll also need to estimate your tentative total tax, payments and credits already made, and the resulting balance due. These figures don't need to be perfect, but they do need to be a genuine, reasonable estimate, not a placeholder.
For Australian companies and other foreign entities, confirm:
- Your US tax classification (foreign corporation, disregarded entity, partnership, and so on)
- Whether connected international reporting obligations (such as Form 5472) ride alongside your return
- Whether a separate state extension is required in addition to the federal one
Where ownership structure, treaty positions, effectively connected income, withholding, or US permanent-establishment questions come into play, consult a qualified tax professional before filing rather than guessing at the figures.
Common Mistakes and What Happens After Filing
A handful of errors account for most rejected or ineffective Form 7004 filings:
- Using an outdated IRS mailing address
- Filing after the underlying return's original deadline has already passed
- Selecting the wrong return code
- Omitting or mistyping the EIN
- Skipping the tax estimate entirely
- Assuming the extension also covers payment, or covers state and local filings automatically
Keep this evidence after filing:
- A completed copy of the form
- Your e-file acceptance acknowledgement, if filed electronically
- Mailing receipt or courier tracking, if paper filed
- Payment confirmation for any amount remitted
- The resulting extended deadline for your records
Form 7004 doesn't require advance IRS approval: it's automatic once properly filed. The IRS will only contact you if the request is rejected or found invalid, so monitor correspondence rather than assuming silence means success.
If you've already missed the deadline: assess whether the return, the payment, or both are late. Make any required payment as soon as possible to limit accruing interest.
Document exactly what happened, then get professional advice on penalty relief or corrective filing options before deciding your next step.
Form 7004 is a federal extension only. It doesn't automatically extend every state, local, or international filing obligation tied to your business, so check those separately.
Frequently Asked Questions
Where do I mail Form 7004?
The address depends on your return type and taxpayer status, so there's no single universal answer. Check the current IRS Where to File page and the Form 7004 instructions before mailing.
What is the deadline to file Form 7004?
Generally, it's due by the original due date of the specific business return you're extending. Fiscal-year businesses, holidays, and certain special return types can shift this date, so confirm against current IRS guidance.
How do I file an extension for LLC taxes?
Multi-member LLCs taxed as partnerships commonly use Form 7004. Single-member LLCs treated as disregarded entities typically follow the owner's individual or corporate extension process instead.
Does Form 7004 extend the tax payment deadline?
No. It only extends your filing time. Estimated tax is still generally due by the original deadline, and unpaid amounts can accrue interest and penalties.
Can a foreign company file Form 7004?
Yes, if it has an eligible US business or information return, such as Form 1120-F. Eligibility, the correct return code, identifying number, and filing method should all be verified against current IRS instructions.
How do I know whether to e-file or mail Form 7004?
It depends on whether your specific return type is supported for e-filing in the current tax year. Check current IRS e-file guidance first, and fall back to the correct paper address if it isn't supported.
