Form 5472 Filing: Online Service vs CPA (2026 Cost & Time Comparison)

Form 5472 is a strange purchase. The form itself is free, the filing carries a $25,000 penalty if you get it wrong or skip it, and quotes for getting it done range from $0 (do it yourself) to $2,000 or more at a CPA firm. That is a wide spread for what is, in most cases, a single-owner information return.

If you own a foreign-owned US LLC, you have probably felt the whiplash: one forum says “never pay more than $100 for this,” the next says “only a fool files an international form without a CPA.” Both are wrong often enough to be dangerous.

This guide puts real numbers on all three options hiring a CPA, using an online filing service, and DIY including the one number most comparisons skip: what an error costs you. Full disclosure up front: we run Form5472.io, one of the online services compared here. We will flag exactly where a CPA is genuinely the better buy.

Quick Verdict: CPA vs Online Service vs DIY

Here is the whole comparison in one table. The rest of the article explains where each number comes from.

New to the form itself? Start with our complete Form 5472 guide this article assumes you already know you need to file.

What CPAs Actually Charge for Form 5472

There is no official price list, and firms rarely publish fees for international forms. Based on published rates from firms that do list them, and the quotes founders report, the market looks roughly like this treat these as estimates, not guarantees:

• Standalone Form 5472 + pro forma 1120: commonly $500–$1,500 at firms that handle international clients. Some publish flat fees in this range for example, one US CPA firm lists $750 for the standard foreign-owned single-member LLC package, and specialist online CPA services advertise roughly $469–$550.
• As part of a larger engagement: firms that bundle bookkeeping, state filings, and tax advice often land at $1,000–$2,000+ per year. Compliance subscriptions from formation companies that include the 5472 can run from about $899 to $1,999 per year as of mid-2026.
• Add-ons: extensions, rush processing, and catch-up years are usually billed separately $150 or more per item is common.

Two things justify CPA pricing when it is justified. First, judgment: a good international CPA does not just fill the form, they tell you whether your income is US-source, whether you have effectively connected income, and whether a tax treaty changes your answer. Second, liability: a paid preparer signs the return and stands behind it.

The catch: Form 5472 is a niche form. Many excellent domestic CPAs see it once a year or never, and a generalist learning on your dime is the worst of both worlds CPA prices with DIY-level familiarity. If you hire one, ask directly how many foreign-owned disregarded-entity filings they prepare each season.

Three more questions worth asking before you sign an engagement letter: whether the quote covers both Form 5472 and the pro forma 1120 (some quotes are per form), whether submission to the IRS is included or you are mailing it yourself, and what a catch-up year costs if you later discover a missed filing. The answers vary more than the headline prices do and they are where a $600 quote quietly becomes $1,200.

What an Online Filing Service Does for $147

Full disclosure again: Form5472.io is our product, so read this section as the maker explaining it, not a neutral third party. Here is what the $147 Starter filing actually includes:

• A guided interview (about 15 minutes) that asks plain-English questions who owns the LLC, what money moved between you and the company and maps your answers onto the form’s parts.
• AI compliance checks on the answers that commonly trigger rejections: missing reference ID numbers, inconsistent ownership percentages, empty reportable-transaction parts, and mismatched EIN details.
• A complete, IRS-ready Form 5472 + pro forma Form 1120 package as a PDF, with mailing instructions for the IRS Ogden address or, for $7.99, we fax it straight to the IRS and give you the transmission confirmation.
• Optional $39.99 penalty abatement letter (a reasonable-cause statement) if you are filing late years.

Higher tiers cover more filings $197 for two filings (typical for a couple who each own an LLC, or one catch-up year plus the current year) and $297 for five. What a service does not do is give you personalized tax advice. The software handles the standard case extremely well precisely because it refuses to improvise on the non-standard one.

DIY: Free, Legal, and Riskier Than It Looks

You are fully entitled to prepare Form 5472 yourself. The form and instructions are free at irs.gov, and our step-by-step filing guide walks through every field. So why does anyone pay?

Because the true cost of DIY is not $0. It is your hours plus your error risk. The instructions assume familiarity with US tax concepts disregarded entities, reportable transactions, reference ID numbers and first-timers routinely spend 4–10 hours getting comfortable. The classic DIY failure points:

• E-filing or attaching the 5472 to the wrong return instead of mailing or faxing the paper package to the IRS Ogden center.
• Leaving Part IV or V empty because “the LLC made no money” capital you put in is a reportable transaction.
• Missing the April 15 deadline (for a foreign-owned single-member LLC) because nothing about a disregarded entity feels like it has a tax deadline.
• Forgetting the form entirely in year two or three.

Each of those is a $25,000 exposure under IRC §6038A the penalty applies to late and substantially incomplete filings, not just non-filings. The full mechanics are in our $25,000 penalty guide. For a deeper look at when DIY makes sense, see our CPA vs DIY comparison.

There is also a simple time-value argument. If a first filing takes you six hours to research and prepare, a $147 service costs you about $25 per hour saved before counting the risk reduction. Whether that trade is worth it depends entirely on what your hours are worth and how confident you are in your own carefulness. Owners who DIY successfully tend to share three habits: they read the current-year instructions (the form changes occasionally), they keep a written record of every owner-to-company transaction as it happens, and they calendar the deadline with a reminder in March, not April.

The Cost-of-Error Math

The right way to compare a $0, $147, and $1,000 option is to add what each one costs when something goes wrong. Rough expected costs for one filing year:

Read the table cynically and one thing jumps out: the expensive mistake is the same $25,000 no matter how much you paid to avoid it. What you are really buying at each price point is a lower probability of that outcome. The $147 service and the $1,000 specialist both cut the risk dramatically for a standard LLC; the difference between them is advice, not accuracy.

Which Should You Choose? By Situation

To be blunt about our own incentive: we make money when you choose the service. But the honest advice stands if your situation involves effectively connected income, treaty questions, or a web of related entities, a specialist CPA is genuinely the better buy, and the extra few hundred dollars is cheap for the judgment involved. Software should own the standard case; humans should own the weird ones.

The Bottom Line

For a standard foreign-owned single-member LLC, the market prices are roughly: CPA $500–$2,000+, online service around $147–$550, DIY $0 plus hours and risk all to avoid the same $25,000 penalty. Match the tool to the complexity: simple facts, use a service; complex structures or income questions, hire the specialist; and only DIY if you will genuinely do it carefully and on time. Form5472.io prepares the full package for $147 in about 15 minutes, with fax-to-IRS delivery for $7.99. See how we stack up against every alternative in our honest roundup of Form 5472 filing services.

Frequently Asked Questions

How much does it cost to have a CPA file Form 5472?

Commonly $500–$2,000+ as of mid-2026, depending on the firm and what is bundled. Some specialist firms publish flat fees in the $469–$750 range for a standard foreign-owned single-member LLC package; full-service compliance subscriptions run higher. Always confirm the quote covers both Form 5472 and the pro forma 1120.

Is an online Form 5472 filing service legitimate?

Yes, for standard cases. Form 5472 for a typical foreign-owned LLC is a structured information return exactly the kind of filing software handles well. The service prepares the same paper package a CPA would, and you review and submit it. What a service cannot do is give personalized advice on source-of-income or treaty questions.

Can I file Form 5472 myself for free?

Yes. The form and instructions are free on irs.gov, and self-filing is fully allowed. Budget several hours for a first filing, follow the paper-only submission rules (mail or fax to the IRS Ogden center), and calendar the April 15 deadline the errors that trigger the $25,000 penalty are almost all avoidable with care.

Why do CPA prices for Form 5472 vary so much?

Because the form is niche and pricing is unpublished. Firms that file it weekly can quote a tight flat fee; generalists price in learning time and risk. Bundled engagements (bookkeeping plus federal and state filings) blur the per-form price further. Asking “how many Form 5472 filings did you prepare last year?” is the fastest way to sort quotes.

Which option is safest if I have missed past years?

Any option that files every missed year with a reasonable-cause statement. The filings themselves are standard; the statement is where quality matters. A service with an abatement letter add-on covers most cases Form5472.io charges $39.99 for it while a CPA makes sense if you have already received penalty notices and need representation.