Form 5472 Deadline Calculator (free 2026 tool)

What this tool does

Calculates the Form 5472 filing deadline for a non-resident-owned single-member Delaware LLC based on the LLC's tax year. Accounts for fiscal-year filers and extension via Form 7004.

Who needs it

Non-resident-owned single-member US LLCs treated as disregarded entities.

How it works

1. Enter your LLC's tax year end (December 31 for calendar-year filers).
2. Tool returns Form 5472 deadline (April 15 for calendar-year, 15th of 4th month after fiscal year end otherwise).
3. Tool shows extension deadline (October 15 with Form 7004).
4. Displays $25,000 penalty for failure to file.

Inputs

• LLC formation date
• Tax year end (default December 31)

Output

Form 5472 deadline date, extension deadline, and penalty amount.

What does the Form 5472 Deadline Calculator actually compute?

This tool takes two facts about your Delaware LLC and turns them into the dates that matter to the Internal Revenue Service. The first input is your formation date, and the second is your tax year end, which defaults to December 31 because most non-resident-owned single-member LLCs run on a calendar year. From those two values the calculator returns three things: the standard Form 5472 filing deadline, the extended deadline you reach by filing Form 7004, and the $25,000 penalty that applies if you fail to file on time. It is not a guess or a rough estimate. The deadline is fixed by statute, so once the tool knows your tax year end it can apply the rule directly and show you the exact calendar date.

The reason this matters is that Form 5472 is paired with a pro forma Form 1120, and the pair is filed together as a single package. A non-resident who owns a US LLC treated as a disregarded entity often assumes there is no filing because the LLC pays no federal income tax. That assumption is wrong. The information return is still required, and the penalty for missing it is steep relative to the cost of compliance. The calculator exists so you can see, in one screen, whether your deadline has already passed, how many days remain, and what the extension buys you. Treat the output as the anchor date around which you schedule your bookkeeping and your filing, not as a soft target you can drift past.

How do I read the two inputs the tool asks for?

The first field is your LLC formation date. This is the date the Delaware Certificate of Formation was accepted, which is the same $110 filing that brought your company into existence. The tool uses this to confirm that your first tax year exists and to frame the deadline for your initial filing. If you formed in, say, September 2025, your first Form 5472 covers the short period from formation through December 31, 2025, and the deadline for that first return still follows the standard rule. Founders frequently forget that the first partial year counts. There is no grace period that lets a brand new LLC skip its opening filing, so the formation date is there to remind you that the clock started the day Delaware stamped your certificate.

The second field is your tax year end, and it defaults to December 31. Most non-resident owners never change this, because a calendar year is the simplest arrangement and matches the default the IRS expects from a disregarded entity. If you have deliberately elected a fiscal year that ends on another month, you change this field and the tool recalculates. Read the field literally: it wants the last day of your tax year, not the first day of the next one. Entering December 31 produces an April 15 deadline, while entering, for example, June 30 produces an October 15 deadline because the rule keys off the fourth month after your year end. Getting this field right is the single most important step, because every output flows from it.

The underlying rule the deadline is based on

The calculator is built on one rule: Form 5472, attached to a pro forma Form 1120, is due on the 15th day of the fourth month after the close of your tax year. For a calendar-year filer whose year ends December 31, the fourth month is April, so the deadline lands on April 15. For a fiscal-year filer the math shifts. A year ending June 30 pushes the deadline to October 15, because October is the fourth month after June. The tool does this counting for you so you never have to work out the arithmetic by hand or second-guess whether the month after your year end is month one or month zero. The rule treats the month containing your year end as the starting point and counts four full months forward.

This rule sits underneath a larger reporting requirement. A single-member LLC owned by a non-resident and treated as a disregarded entity is treated as a corporation for the limited purpose of this filing. That is why the return is a Form 1120 even though your LLC is not a C corporation and pays no corporate tax. The 1120 is filed as a pro forma shell, meaning you complete only the identifying boxes rather than a full income statement, and Form 5472 carries the substance, which is the record of reportable transactions between you and your own company. The deadline the tool shows is the deadline for that whole package, filed by mail or fax to the IRS, not for any separate state filing.

What the extension deadline means and how Form 7004 fits in

The third output is the extended deadline, which for a calendar-year filer is October 15. You do not reach this date automatically. You reach it by filing Form 7004, the application for an automatic extension of time to file certain business income tax returns, on or before your original deadline. File the 7004 by April 15 and your Form 5472 package is then due October 15 instead. The calculator shows both dates side by side so you can decide early whether you need the extra six months. The extension is for filing the return, and because a disregarded LLC with no US tax owed has no payment to make, the extension here is purely about buying time to gather records and complete the forms correctly.

A few points are worth holding in mind when you use the extended date:

• The 7004 must be submitted by the original deadline. Filing it on April 16 does not work, because the extension only exists if you claim it on time.
• The extension moves the filing date, not the requirement. You still owe a complete Form 5472, and the $25,000 penalty still applies if you miss October 15.
• A short first year still follows the same pattern. If your initial year ended December 31, you can extend that first return to October 15 the same way.
• The extension does not change your tax year end input, so the tool keeps using December 31 (or your fiscal date) to compute both columns.

A worked example for a calendar-year non-resident founder

Imagine you are a founder based outside the United States who formed a single-member Delaware LLC on March 4, 2025, and you kept the default December 31 tax year. You enter March 4, 2025, in the formation field and leave the tax year end on December 31. The tool returns April 15, 2026, as your standard Form 5472 deadline, October 15, 2026, as your extended deadline if you file Form 7004 in time, and $25,000 as the penalty for failure to file. That first return covers the period from March 4 through December 31, 2025, which is a partial year, but the deadline is unchanged. You now know that by April 15, 2026, you must either mail the completed package or have your 7004 extension on file.

Suppose you realize in early April that your bookkeeping is incomplete and you cannot finish the 5472 in time. You file Form 7004 on April 10, 2026, which is before the April 15 deadline, and your filing date moves to October 15, 2026. The calculator already showed you that October date, so you were not surprised by it. Between April and October you reconstruct your records of money moved between you and the LLC, complete the pro forma 1120 cover and the 5472, and file by October 15. No tax is due, because the LLC is a disregarded entity with no US-source income in this scenario, but the information return is filed and the $25,000 exposure is closed. This is the ordinary path most non-resident owners take in their first year.

A worked example for a fiscal-year filer

Now change one input. Say you elected a tax year ending June 30 rather than December 31. You enter your formation date and set the tax year end to June 30. The tool no longer returns April 15. Instead it counts four months from the end of June and returns October 15 as your standard deadline. Your extended deadline then moves further out, because the extension runs six months from the original date. This is exactly the case where founders make mistakes by hand, because they assume every Form 5472 is due April 15. It is not. The deadline follows your tax year, and the calculator is built to catch this so you do not file three and a half months late on a wrong assumption.

Reading the output for a fiscal-year filer takes the same discipline as the calendar case. Confirm that the tax year end you typed is the genuine last day of your accounting year, then trust the standard deadline the tool prints. If you intend to extend, file your Form 7004 before that standard date, not before April 15, because April 15 is irrelevant to a June 30 filer. The penalty figure stays at $25,000 regardless of which tax year you run, since the penalty attaches to the failure to file the form rather than to the calendar. Most non-resident owners have no reason to run a fiscal year, so if you see April 15 in the output and you never elected anything unusual, that is the expected and correct result.

Why the $25,000 penalty figure sits in the output

The penalty box is not decoration. The statute that requires Form 5472 sets a penalty of $25,000 for each failure to file a complete and correct return by the due date, and the same amount can apply for failure to maintain the records the form is based on. The calculator surfaces this number so the cost of missing the date is visible at the moment you are looking at the date. A non-resident who treats the filing as optional because the LLC owes no income tax is exposed to a penalty that dwarfs the cost of compliance. The number is there to convert an abstract deadline into a concrete reason to act before it passes.

It is worth understanding what triggers the penalty so you can avoid it. The penalty applies when the return is not filed, when it is filed late, or when it is filed but materially incomplete or incorrect. Filing something on time that is missing required reportable transactions can be treated the same as not filing at all. This is why the tool pairs the deadline with the penalty rather than showing the date alone. The date tells you when, and the penalty tells you the stakes. If you reach your deadline and your records are not ready, the safer move is to file Form 7004 for the extension rather than to rush an inaccurate return that could still draw the same penalty.

What counts as a reportable transaction for the form behind this date

The deadline this tool computes is meaningless without knowing what the filing reports, so it helps to understand the substance. Form 5472 records reportable transactions between your LLC and its foreign owner, which is you, and between the LLC and other related foreign parties. For a non-resident single-member LLC, the most common entries are the money you contributed to capitalize the company and the money you withdrew from it. Many founders are surprised that simply funding their own LLC and later taking money out creates reportable transactions, but it does, and those movements are the core of what the 5472 captures for a disregarded entity.

Common categories a non-resident founder should track through the year include the following:

• Capital contributions you sent to open and fund the LLC.
• Distributions or withdrawals you took back out of the LLC.
• Loans between you and the company in either direction.
• Payments the LLC made to you or to other related foreign parties for services or other amounts.
• Reimbursements and any other amounts that moved between you and your own entity.

Common mistakes the calculator helps you avoid

The first mistake is assuming no filing is required. A disregarded LLC pays no federal income tax, and founders read that to mean there is nothing to do. The Form 5472 information return is separate from income tax and is required regardless. The second mistake is using the wrong deadline. People copy April 15 from a tax article without checking their own tax year, and a fiscal-year filer who does that files months late. The third mistake is confusing the federal deadline with the Delaware franchise tax. The franchise tax of $300 is due June 1 to the state and is unrelated to Form 5472. The calculator deals only with the federal filing date, so do not let the June 1 state date crowd out your April 15 federal date.

A further set of errors clusters around the extension and the first year. Some owners file Form 7004 after their deadline has already passed and believe they are covered when they are not. Some skip their first short year because the LLC was only active for a few months, not realizing the partial year still requires a return. Others treat the extension as a delay of any tax payment, when in a disregarded-entity scenario there is usually no payment at all and the extension is only about filing time. The tool guards against the timing errors by showing both the standard and extended dates and by tying them to the tax year end you enter, so you are working from your own facts rather than a generic article.

Edge cases: short years, late formation, and changed year ends

Several situations deserve careful handling. A late-in-the-year formation creates a short first tax year. If you formed on November 20, 2025, with a December 31 year end, your first period is barely six weeks, but the deadline is still April 15, 2026, and the filing is still required. The tool treats this period as a real tax year because the IRS does. Another edge case is the founder who is unsure of the exact formation date. Use the date on your Delaware Certificate of Formation, the acceptance date for the $110 filing, rather than the date you first thought about forming or the date you opened a bank account. Banking with Mercury, Wise, Relay, Lili, or Payoneer does not change your formation date or your filing deadline.

A third edge case is a deliberate change of tax year end, which is uncommon for non-resident single-member LLCs but possible. If you change your year end, you re-enter the new date and the tool recomputes both the standard and the extended deadline from the new fourth-month rule. Do not assume your old April 15 date carries over. One more case worth flagging: the obtaining of an Employer Identification Number, which arrives roughly eight to ten business days after you submit Form SS-4 at no cost, is a prerequisite for filing but does not move the deadline. You need the EIN to file the 5472, so a late EIN request can leave you scrambling, but the due date the calculator shows is unchanged by when your number arrives.

How this filing differs from your other Delaware obligations

Non-resident owners juggle several dates, and it is easy to blur them together. The Form 5472 deadline this tool computes is a federal information filing tied to your tax year. It is distinct from the Delaware franchise tax of $300, which is due to the state on June 1 each year and carries its own late penalty of $200 plus 1.5% interest per month if you miss it. It is also distinct from the one-time $110 Certificate of Formation that created your company. Keeping these separate matters, because the franchise tax and the 5472 have different recipients, different forms, and different consequences. The calculator deliberately covers only the federal 5472 package so that one date is clear and unconfused.

There is one obligation you can cross off the list. Single-member LLCs formed in the United States are exempt from beneficial ownership information reporting under the FinCEN interim final rule issued March 26, 2025, so a US-formed Delaware LLC does not file a BOI report. That removes a deadline many founders worried about, but it does nothing to your Form 5472 obligation, which remains fully in force. Use this tool for the federal information deadline, track June 1 separately for the franchise tax, and remember that the BOI worry no longer applies to your US-formed entity. Three obligations, three different handling rules, and only the 5472 date is what this calculator is built to give you.

What to do with the result the calculator gives you

Once the tool returns your three values, turn them into a short plan. Write the standard deadline at the top of your records folder and set a reminder a full month before it. Use that month to confirm your EIN is in hand, reconstruct the reportable transactions between you and the LLC for the year, and decide whether you can finish the package by the standard date. If you can, complete the pro forma Form 1120 cover and the Form 5472 and submit them together to the IRS by mail or fax. If you cannot, file Form 7004 before the standard date and shift your work to the extended deadline the tool printed. The result is most useful when you act on it weeks ahead rather than on the date itself.

Keep a copy of everything you file and the records that support it, because the same statute that requires the form also requires you to maintain those records, and failing to keep them carries its own exposure. If your situation is unusual, for example you have multiple related foreign parties or large loans moving in both directions, the calculator still gives you the correct date, but you may want a tax professional to prepare the form itself. The tool answers the timing question precisely. The substance of the return, which reportable transactions to list and at what amounts, is the work you do in the weeks the calculator has just shown you that you have. Used this way, the deadline stops being a source of anxiety and becomes a fixed point you plan around.