IRS Streamlined Filing Specialist: PE Pack, Cost & Timeline

A complete Streamlined Foreign Offshore pack for an American private equity professional in London contains three delinquent or amended Form 1040s with every schedule and information return, six FBARs filed electronically, a signed Form 14653 and payment of tax plus interest. Built properly from K-1s, K-3s and UK records, it typically takes eight to fourteen weeks.

That is the short answer. The longer answer, which this guide sets out, is that a private equity profile turns a routine catch-up into a multi-entity reconstruction exercise. Carried interest, co-investment, management fee waivers, UK funds held in ISAs and a UK pension all have to be translated into US reporting for years you did not originally file. Working with an IRS Streamlined Filing Specialist who understands both fund reporting and HMRC records is what separates a submission that closes the matter from one that invites questions.

At Jungle Tax we prepare these packs for founders, partners and senior investment professionals on both sides of the Atlantic. Below is exactly what goes into the pack, how each component is built, what we need from you, and what determines the timeline and cost.

What is the Streamlined Foreign Offshore Procedure?

The Streamlined Filing Compliance Procedures are the IRS route for US taxpayers whose failure to report foreign income, pay tax and file information returns, including FBARs, was non-willful. The IRS defines non-willful conduct as negligence, inadvertence, mistake or a good-faith misunderstanding of the law. The foreign version applies to taxpayers who meet a non-residency test; there is also a domestic version for US residents, which carries a 5% miscellaneous offshore penalty that the foreign version does not.

Under the IRS instructions for US taxpayers residing outside the United States, a qualifying taxpayer who follows the procedures is not subject to failure-to-file, failure-to-pay, accuracy-related, information return or FBAR penalties. You pay the tax due and statutory interest. The procedure is not available if the IRS has already opened a civil examination of any of your returns, or if you are under criminal investigation, so timing matters.

Do you meet the non-residency test?

For a US citizen or green card holder, the test is met if, in any one or more of the most recent three years for which the return due date has passed, you did not have a US abode and were physically outside the United States for at least 330 full days. If you file jointly, both spouses must meet it. Private equity professionals often travel to New York or the West Coast for fundraising, portfolio and investment committee work, so we build a day count from passport stamps, travel bookings and diaries rather than estimates. Only one qualifying year in the three is needed, but it must be provable.

Which years go into the pack?

The look-back is measured from due dates that have passed, including any valid extension. For a submission prepared in late 2026, the pack would typically cover:

• Income tax returns: 2023, 2024 and 2025 (Form 1040 if never filed, Form 1040-X if an original was filed but was wrong or incomplete).
• FBARs: calendar years 2020 through 2025, being the six most recent years whose FBAR due date has passed.

The scope is not a matter of choice. Filing four years of returns, or five FBARs, does not satisfy the procedure, and filing the wrong three years can leave a gap that is no longer covered by the penalty relief. We confirm the window against your actual extension history before any work starts.

The complete pack: component by component

The table below sets out what a full pack contains for a typical London-based US private equity professional, and where each item draws its data from on each side of the Atlantic.

Component	Purpose	Primary US source data	Primary UK source data
Form 1040 / 1040-X (x3)	Report worldwide income for each of the three years	K-1s, K-3s, US brokerage 1099s	P60, P11D, Self Assessment returns, payslips
Form 1116 (per category, per year)	Claim credit for UK tax paid against US tax	K-3 foreign-source detail	HMRC tax calculations and payment records
Form 8938	Disclose specified foreign financial assets	Fund interests where reportable	Bank, broker, ISA and pension balances
Form 8621 (per PFIC, per year)	Report UK and other non-US pooled funds	Not applicable	ISA and platform statements, fund distribution records
Form 5471 / 8865 (if relevant)	Report interests in foreign corporations or partnerships	Entity accounts and ownership records	Companies House filings, UK LLP and company accounts
Form 8833 (if relevant)	Disclose treaty-based return positions	US-UK treaty articles relied upon	UK pension scheme documentation
FinCEN Form 114 (x6)	Report foreign accounts above the aggregate threshold	Not applicable	Highest balance per account per calendar year
Form 14653	Certify eligibility and non-willful conduct with a narrative	Your personal history	Your personal history

The three Form 1040s and their schedules

Each return must stand on its own as a complete, accurate return for the year, not a summary. For a private equity professional that usually means Schedule B (interest, dividends and the foreign account questions in Part III), Schedule D and Form 8949 for capital gains, Schedule E for partnership income from fund K-1s, Form 8960 for net investment income tax, and Form 6251 where alternative minimum tax needs to be tested. Salary paid through a UK payroll is reported on the face of the return in US dollars, using a consistent and documented exchange rate methodology.

For most senior earners the foreign tax credit is more valuable than the foreign earned income exclusion, because UK rates on high incomes typically exceed US federal rates and excess credits can be carried. We model both, and a choice that was never made in an original return can usually be made in a streamlined return. The choice has consequences for future years, so it is made deliberately, not by default.

Form 1116: matching UK tax to the right US basket

Foreign tax credits are calculated separately for general category income (salary, bonus, and in many cases fee-related income) and passive category income (most investment returns). Carry can straddle both, depending on the character of the underlying gains and income. The fund's Schedule K-3 is the starting point for the foreign-source analysis, because it breaks down the partner's share of income by source and category. Where a fund did not issue a K-3, or issued one with limited detail, we work from the fund's financial statements and allocation reports.

A critical cross-border point: UK tax is paid on a 6 April to 5 April year, while US returns run on the calendar year. UK tax must be matched to the income it relates to and to the correct US year, which means splitting P60 figures and Self Assessment liabilities across two US years. Getting this wrong is the most common reason streamlined returns either overstate tax due or claim credits the IRS later disallows.

Form 8938: specified foreign financial assets

Form 8938 sits alongside the FBAR but is a separate requirement with different thresholds and a different definition of what counts. For taxpayers living abroad, the filing thresholds are higher than for US residents, starting at more than $200,000 at year end or $300,000 at any time in the year for a single filer, and double those figures for joint filers. UK bank and broker accounts, ISAs, UK pension interests and interests in non-US fund vehicles can all be reportable. In a private equity file the asset totals usually exceed the thresholds comfortably, so we assume Form 8938 is needed in all three years unless the numbers prove otherwise.

Form 8621: UK funds, ISAs and PFICs

UK unit trusts, OEICs, investment trusts and most Irish or Luxembourg-domiciled ETFs are generally treated as passive foreign investment companies for US purposes. The ISA wrapper is invisible to the IRS, and UK reporting fund status is not the same as a US qualified electing fund election. Without a valid election, gains and excess distributions are taxed under the default regime, which applies the highest ordinary rate plus an interest charge. As the IRS guidance on Form 8621 sets out, the form is filed separately for each fund.

For someone who has invested a full ISA allowance for a decade, that can mean dozens of Form 8621s across three years, each needing purchase history going back to the original acquisition. In practice, PFIC reconstruction is frequently the single largest component of the pack by preparation hours. Where a mark-to-market election is available for exchange-traded funds, we consider whether making it now improves the position for the future.

Form 5471 and other entity returns

Form 5471 applies where a US person is an officer, director or at least 10% shareholder of a foreign corporation in specified circumstances. In a private equity context this most often arises from a personal holding company, a co-invest vehicle structured as a corporation, or a UK management company in which you hold a significant stake. Form 8865 is the partnership equivalent and can apply to interests in UK LLPs or limited partnerships above the relevant ownership thresholds. Most fund-level carry vehicles do not trigger these forms for an individual partner, but each structure must be checked, because the missing entity return is precisely what the streamlined procedure is meant to cure.

The six FBARs

An FBAR is required for any calendar year in which the aggregate maximum value of your foreign financial accounts exceeded $10,000 at any point. Each account is reported at its highest balance in the year, converted at the US Treasury's year-end reporting rate. Accounts with signature authority but no financial interest, such as a firm account you can operate, may also be reportable. The six streamlined FBARs are filed electronically through the FinCEN BSA E-Filing System, selecting "Other" as the reason for late filing and entering "Streamlined Filing Compliance Procedures" in the explanation box. They are not posted with the paper pack.

To understand the exposure the procedure is protecting you from, our FBAR penalty calculator illustrates how quickly unfiled years can compound.

Form 14653: the certification and narrative

Form 14653 is signed under penalties of perjury. It certifies that you meet the non-residency test, that all required FBARs have now been filed, and that your failure to comply was non-willful. It must include a specific factual narrative explaining why you did not file, your financial background, and how you came to learn of the obligation. The original signed form goes in the pack, and a copy is attached to each tax return and information return. A generic or incomplete statement can cause the pack to be processed as ordinary late returns, without the streamlined penalty terms.

For a highly paid finance professional, the narrative carries more weight than for most filers. The IRS will expect a credible account of why a sophisticated person missed the obligation, for example reliance on a UK payroll and a UK adviser who did not address US filing, or a belief that UK withholding satisfied all obligations. It must be accurate and specific. We draft it with you, but the facts are yours.

How carried interest, co-invest and fund data flow into the pack

This is where private equity files differ from every generic streamlined guide. The fund-level data has to be gathered, reconciled and translated before a single return line can be completed.

• Carried interest: for US purposes, carry held through a partnership is reported from the K-1 allocations each year, generally as allocated rather than when cash is distributed. Long-term capital gain treatment for applicable partnership interests requires a holding period of more than three years, so gains allocated within that window may be recharacterised as short-term. The K-1 or its supplemental statements should disclose the information needed for this test.
• Co-investment: personal co-invest commitments, often made through feeder vehicles, can generate their own K-1s or, where structured through non-US corporate vehicles, PFIC or Form 5471 considerations.
• Management fee waivers and GP commitments: these can produce allocations that differ in character and timing from salary and carry, and need to be traced to the year in which they were allocated.
• Non-US fund vehicles: funds organised as UK, Jersey, Guernsey or Luxembourg partnerships may not issue a US K-1 by default. We request US tax reporting from the fund administrator, or reconstruct allocations from capital account statements where the administrator cannot help.

The UK applies its own rules to the same carry. Under the regime that has applied since 6 April 2026, carried interest is brought into income tax as trading profits, with an adjustment for qualifying carry, while earlier years fall under the capital gains rules for carried interest. Because the UK broadly taxes on receipt and the US on allocation, the same carry is often taxed in different years in each country. Where UK tax on carry falls in a year after the US tax, the foreign tax credit carryback and carryforward rules, together with timing of UK payments, determine how much double taxation can be relieved within the streamlined window. This is a reconciliation exercise that has to be documented year by year.

Unreported UK pensions and the treaty

Many American professionals in London have workplace pensions, SIPPs or both, and have never reported them to the IRS. The US-UK income tax treaty generally allows growth inside a UK pension scheme to be deferred for US purposes and can exclude employer contributions to a recognised UK scheme from US income, subject to limits. Where those treaty positions are taken, Form 8833 may be required, and the pension balances are generally reportable on the FBAR and Form 8938. We review the scheme documentation and contribution history for each year so that the pension is treated consistently across all three returns. Our US-UK tax accountants handle the pension analysis alongside the main pack.

The UK records the pack is built from

Strong UK records shorten the timeline more than any other factor. For each relevant UK tax year, we typically ask for:

• P60 and P11D, plus final payslips for any year with a bonus, a change of employer or a leaving payment.
• Filed Self Assessment returns, including the capital gains and foreign pages, and HMRC tax calculations (SA302 or the online equivalent).
• Statements showing UK tax payments on account and balancing payments, which are needed to support foreign tax credits.
• Broker and platform statements, including ISA annual statements, contract notes and dividend vouchers.
• Bank statements showing the highest balance in each calendar year for every account, joint accounts included.
• Pension statements, contribution records and scheme rules.
• Carry, co-invest and fund documents: K-1s, K-3s, capital account statements, distribution notices and the relevant LPA terms.

If you no longer have past Self Assessment returns, HMRC's online account usually holds the returns and calculations for recent years. The GOV.UK Self Assessment guidance explains how UK returns and records are managed. If you have not been filing in the UK when you should have, that needs to be resolved in parallel, and our UK tax services team can handle the HMRC side.

How does an IRS Streamlined Filing Specialist build the pack?

A well-run engagement follows a defined sequence. Here is how we approach it for a private equity client.

1. Eligibility and scope (week 1): confirm non-residency using day counts, confirm no IRS examination is open, fix the three return years and six FBAR years, and identify every account, fund and entity.
2. Document collection (weeks 1 to 5): gather UK records and request K-1s, K-3s and statements from fund administrators. Historic fund reporting is usually the slowest item.
3. Reconstruction (weeks 3 to 8): build PFIC histories, reconcile carry allocations, calculate highest balances, and convert sterling using a documented rate policy.
4. Preparation (weeks 5 to 10): prepare the three returns, Forms 1116, 8938, 8621 and any entity returns, then the six FBARs, then the draft Form 14653 narrative.
5. Review (weeks 9 to 12): senior review of every return for internal consistency, including whether the FBAR balances, Form 8938 values and income figures agree with each other.
6. Signing and submission (weeks 11 to 14): you sign the returns and Form 14653, we file the FBARs electronically, and the paper pack, marked "Streamlined Foreign Offshore" at the top of each return and information return, is posted with payment by tracked courier to the IRS streamlined address.

The IRS does not acknowledge receipt of streamlined submissions. That is why we keep a complete copy of the pack, courier tracking, payment evidence and FBAR confirmation numbers in a single closing file for you.

What drives the cost?

Streamlined pricing for a private equity professional is driven by complexity, not by income or net worth. The variables that matter most are:

• Number of fund partnerships: each K-1 and K-3 across three years must be entered, reconciled and tested.
• PFIC count and history: the number of non-US funds, how long they have been held and whether purchase records exist.
• Entity returns: each Form 5471 or 8865 is a substantial return in its own right.
• Foreign tax credit complexity: multiple baskets, carryovers and carry timing mismatches add calculation time.
• Account volume: the number of accounts across six FBAR years.
• Record quality: missing statements require reconstruction, which is the most unpredictable cost line.
• UK-side remediation: any parallel HMRC work, if UK filings are also behind.

We quote a fixed fee once the scope is confirmed in week one, so you know the cost before reconstruction begins. Clients with complex structures across both jurisdictions often combine this with our high-net-worth compliance service for future years.

US vs UK: how the two sides of the pack compare

Issue	US (IRS)	UK (HMRC)
Tax year	Calendar year	6 April to 5 April
Carried interest timing	Generally taxed as allocated through the K-1	Broadly taxed on receipt
ISAs	No recognition; underlying funds often PFICs	Income and gains exempt
UK pension growth	Treaty deferral, may need Form 8833	Tax-relieved within scheme rules
Account disclosure	FBAR and Form 8938	No equivalent disclosure for UK residents' UK accounts
Catch-up route	Streamlined Foreign Offshore Procedures	Late returns or HMRC disclosure where UK tax is owed

After submission: what happens next?

Streamlined returns are processed like any other return. You may receive a notice adjusting interest, a balance-due letter or a refund cheque, and returns can be selected for examination under normal rules. If the IRS later finds additional tax, the usual penalties may apply to that additional deficiency only, which is why accuracy across every schedule matters. From the next filing season you are expected to file normally, on time, each year. Most clients move straight into an annual compliance arrangement through our US tax services, so that the next year's K-1s, PFICs and FBARs are captured as they arise rather than reconstructed.

Common pack weaknesses in private equity files

• Carry reported on a cash basis to match the UK, rather than on US allocation.
• UK tax claimed in the wrong US year because the April year end was ignored.
• ISA funds omitted from Form 8621 on the assumption that the wrapper protects them.
• FBAR highest balances that do not reconcile with Form 8938 values.
• A Form 14653 narrative that is generic, or that contradicts the financial sophistication evident in the returns.
• A missing Form 5471 for a personal holding or co-invest company.

Each of these can undermine the penalty protection the procedure offers. A specialist pack anticipates them before the returns are signed.

Speak to a specialist in confidence

If you are a US citizen or green card holder working in private equity in London and you have unfiled US returns, unreported UK accounts, ISAs or a UK pension, the streamlined procedure remains the cleanest route back into compliance, provided the pack is complete and accurate. We prepare the full submission, from day counts and fund reconciliations to the six FBARs and the Form 14653 narrative, and we coordinate the HMRC side where needed. To arrange a confidential consultation and a fixed-fee scope, contact our cross-border team.