Does every foreign fund require Form 8621?

Not automatically. The entity must first meet the PFIC income or asset test, and filing requirements and exceptions depend on the holding, activity, elections and taxpayer facts. A non-US fund or ETF is a strong reason to perform PFIC analysis, not a definitive classification by itself.

What does this calculator determine?

For supported §1291 inputs, it allocates a disposition gain or excess distribution across the exact holding period, applies the stored statutory top rates to prior-year allocations and calculates interest using stored quarterly IRS underpayment rates with daily compounding.

Why does the result not show one total tax number?

The current-year allocation is ordinary income and its tax depends on the rest of the return. Showing it as though it were automatically taxed at one fixed rate would be misleading. The tool therefore separates that amount from the prior-year deferred tax and interest it can calculate.

What is the difference between a PFIC calculator, a PFIC checker and Form 8621 preparation?

They are three separate steps. The checker screens whether a holding is a PFIC at all. This calculator computes a §1291 allocation once you already know a PFIC was sold or paid an excess distribution. Preparation is where each holding-year gets its own Form 8621 inside a complete return. A calculation is not a classification, and neither is a filed form.

Can this calculator compare §1291 with a QEF election?

Not from gain alone. A QEF calculation requires a valid PFIC Annual Information Statement with ordinary earnings and net capital gain, plus facts about election timing. Atamatax asks for those inputs instead of applying an invented capital-gains percentage.

Are FBAR and Form 8938 separate from Form 8621?

Yes. Form 8621 concerns PFIC reporting. FBAR and Form 8938 concern foreign accounts and specified foreign financial assets under different thresholds and rules. The same investment can be relevant to more than one analysis.

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PFIC calculator for Form 8621

Enter a disposition gain or excess distribution and the exact dates, and this PFIC calculator allocates the §1291 amount by day, applies the stored statutory top rate to each prior year, and adds daily-compounded IRS interest. It reports the current-year ordinary-income amount separately rather than inventing its tax. Start with the Form 8621 filing guide if you have not yet established the reporting obligation, or the PFIC checker if you are not sure the holding is a PFIC at all.

Enter exact dates so Atamatax can allocate the amount by day and apply the stored statutory top rate and quarterly IRS underpayment rates. Nothing is saved.

Educational calculation, not tax advice or a filing determination. The engine uses exact holding-period dates, daily compounding and stored quarterly §6621 rates. Prior distributions, pre-PFIC years, elections, exceptions and the facts on your full return can change the filed result.

How it works

From event to preparation in four steps.

01
Identify the event
Choose a disposition gain or current-year distribution.
02
Enter exact dates
Provide acquisition and event dates so the holding period can be allocated by day.
03
Review the calculated components
Separate current-year ordinary income from prior-year deferred tax and the §1291 interest charge.
04
Continue into preparation
Use the portfolio analyzer or Atamatax filing workflow to add the holding facts and any supported election information.

Calculation boundary

What the engine calculates from this form, and what needs more.

Calculated from supported inputs

Exact day allocation, prior-year statutory top rates, deferred tax, stored quarterly §6621 rates, daily-compounded interest, and the current-year ordinary-income amount.

Requires more facts

PFIC classification, filing exceptions, pre-PFIC years, current-year marginal tax, QEF Annual Information Statement figures, election timing and mark-to-market eligibility.

This result is an educational estimate on the numbers you entered — general information rather than individualised tax advice; which forms your year requires is settled from your full facts. How the figures are produced is documented in the methodology, and the review limits in accuracy and review.

What this tool answers

One question, answered properly.

It answers

How much a §1291 gain or excess distribution allocates to each prior year, the deferred tax on those allocations, and the daily-compounded IRS interest on top.

Answered elsewhere

Whether the fund is a PFIC, whether a filing exception applies, your current-year marginal tax, or how a QEF election would compare — QEF needs the fund's Annual Information Statement, not a gain.

The rest of the PFIC cluster

Each of these answers a different question.

FAQ

PFIC calculator questions

Does every foreign fund require Form 8621?: Not automatically. The entity must first meet the PFIC income or asset test, and filing requirements and exceptions depend on the holding, activity, elections and taxpayer facts. A non-US fund or ETF is a strong reason to perform PFIC analysis, not a definitive classification by itself.
What does this calculator determine?: For supported §1291 inputs, it allocates a disposition gain or excess distribution across the exact holding period, applies the stored statutory top rates to prior-year allocations and calculates interest using stored quarterly IRS underpayment rates with daily compounding.
Why does the result not show one total tax number?: The current-year allocation is ordinary income and its tax depends on the rest of the return. Showing it as though it were automatically taxed at one fixed rate would be misleading. The tool therefore separates that amount from the prior-year deferred tax and interest it can calculate.
What is the difference between a PFIC calculator, a PFIC checker and Form 8621 preparation?: They are three separate steps. The checker screens whether a holding is a PFIC at all. This calculator computes a §1291 allocation once you already know a PFIC was sold or paid an excess distribution. Preparation is where each holding-year gets its own Form 8621 inside a complete return. A calculation is not a classification, and neither is a filed form.
Can this calculator compare §1291 with a QEF election?: Not from gain alone. A QEF calculation requires a valid PFIC Annual Information Statement with ordinary earnings and net capital gain, plus facts about election timing. Atamatax asks for those inputs instead of applying an invented capital-gains percentage.
Are FBAR and Form 8938 separate from Form 8621?: Yes. Form 8621 concerns PFIC reporting. FBAR and Form 8938 concern foreign accounts and specified foreign financial assets under different thresholds and rules. The same investment can be relevant to more than one analysis.

Before you rely on this result

What would settle it, and what covers it

Documents or facts needed

• The fund's legal name and ISIN (from the broker statement or the KID)
• Purchase dates and cost for each lot, and any sale date and proceeds
• Every distribution received in the year
• Any QEF or mark-to-market election already made in a prior year

Where this leads

PFIC Portfolio · $499 — computes the §1291 allocation and drafts the supported Form 8621 for each PFIC.

Also possible: CPA Export ($199). The cheapest route that covers your facts is the right one; a package never covers more than one tax year.

How to read a status

Likely:: The facts entered meet the published test; confirm the inputs before acting.
Possible:: Some facts point this way and others are missing; more information decides it.
Needs review:: These inputs leave it open; a person should look before filing.
Not currently indicated:: Nothing entered triggers it this year; a changed fact can change the answer.
Outside supported scope:: This item is routed to a professional for preparation.

Scope. An estimate under the default §1291 rules for one holding; the actual form depends on the election history and the full year's facts. This is a computation on the answers you gave, not individualized tax advice.

What changes the result

This answer changes if…

Whether a fund is treated as a PFIC

…the fund is held inside a pension or retirement arrangement the U.S. recognises for this purpose — a treaty-recognised pension can take the fund out of Form 8621 reporting for the years it stays inside.
…the fund turns out to be U.S.-registered under a European-sounding name — a U.S.-registered fund is not a PFIC at all; the ISIN decides it. Check it
…the instrument is a note or a certificate rather than a fund — an exchange-traded note or a structured certificate is a debt claim on its issuer, analysed differently. Check it
…you hold shares of the fund manager rather than units of one of its funds — an operating company is not a pooled vehicle; the domicile alone never decides it.
…a reviewer has verified the classification — a screen from the fund's identity becomes a determination only when a person checks the fund's own facts.

What a PFIC costs in a given year

…you sold the holding, in full or in part, during the year — a disposition is an excess distribution over the whole holding period, with interest, not a capital gain.
…the fund paid you a distribution that exceeds 125% of the prior three years' average — the excess is thrown back across the holding period and taxed at each year's top rate.
…a qualified electing fund or mark-to-market election was made in a prior year — an election changes the regime for every later year until revoked; the §1291 default no longer applies.
…the fund publishes a PFIC Annual Information Statement — a QEF election becomes available; without the statement it cannot be made or kept.
…the purchase date or the cost is not what the statement assumed — the holding period and the basis drive both the allocation and the interest; a reconstructed date moves both.
…the year-end value is not the one used — under mark-to-market the year's inclusion is the change in value; a different value is a different figure.

Each line names a fact that moves the result; what it moves to depends on the rest of your facts. Nothing here is a determination.

How Atamatax calculations are produced — the tests applied, statutory sources and review cadence — is documented in the methodology, and how the engine is validated in accuracy & review. Calculation fixes are recorded in the changelog.

Authorities cited

IRC §1291 — IRC §1291 — Interest on tax deferral (excess-distribution regime)
IRS Form 8621 — About Form 8621 — Information Return by a Shareholder of a PFIC or QEF
IRC §6601 — IRC §6601 — interest on underpayment, nonpayment, or extensions of time for payment of tax

Primary sources (Cornell Legal Information Institute for the US Code and CFR; IRS.gov for forms, procedures, and treaty documents). This page is general information, not individualized tax or legal advice.