IRS Streamlined Filing UK Inheritance Reporting Guide |

IRS Streamlined Filing: UK Inheritance Reporting Guide

IRS Streamlined Filing and UK Inheritance Reporting

The IRS streamlined filing process for Americans in the UK frequently surfaces a filing gap that clients never anticipated — the Form 3520 obligation for a UK inheritance received from a British estate. The United States does not impose income tax on inheritances — inherited assets are generally received free of US income tax regardless of their size. However, the US does require a US person who receives a foreign inheritance exceeding $100,000 in a single tax year to report it on Form 3520. This annual information return carries a severe penalty of 35% of the gross reportable amount for failure to file. Furthermore, this obligation applies regardless of whether any US tax is owed on the inheritance — the reporting requirement exists independently of any tax liability. Additionally, many Americans who inherited from UK parents or grandparents in prior years never filed Form 3520 — because neither their UK solicitor nor their UK accountant was aware of the US filing obligation. Consequently, the Form 3520 gap is one of the most common correctable errors that IRS streamlined filing addresses for UK-based Americans — and the streamlined procedures provide an efficient correction route where the non-compliance was genuinely non-wilful.

The Form 3520 Obligation for UK Inheritances

Who Must File and the $100,000 Threshold

Any US person who receives a bequest, inheritance, or gift from a foreign estate or non-US person exceeding $100,000 during the tax year must file Form 3520 — including US citizens and green card holders. Furthermore, the $100,000 threshold is an aggregate — all amounts received from foreign persons during the calendar year are combined, and where the total exceeds $100,000, Form 3520 must be filed reporting all amounts received. Additionally, where multiple inheritances are received from the same estate in different tax years — for example, a partial distribution in year one and a final distribution in year two — each year is assessed separately against the $100,000 threshold. Consequently, a US citizen who received £40,000 from a UK estate in one year and £70,000 in the following year has no Form 3520 obligation in year one but a Form 3520 obligation in year two — since the year-two receipt alone exceeds the $100,000 threshold. The IRS Form 3520 guidance is at https://www.irs.gov/forms-pubs/about-form-3520.

The Penalty for Missing Form 3520

The penalty for failing to file Form 3520 where it was required is the greater of $10,000 or 35% of the gross reportable amount — calculated on the full value of the foreign inheritance or gift. Furthermore, this penalty is not capped — it applies to the full value of the unreported amount regardless of how large the inheritance was. Additionally, where the IRS identifies the missing Form 3520 through FATCA data or other information exchanges, the penalty is assessed automatically — and abating it requires a reasonable cause argument that must be specifically documented. Consequently, a US citizen who received a £120,000 UK inheritance and never filed Form 3520 faces a potential penalty of 35% of approximately $152,000 — approximately $53,200 — before any interest on the penalty is added. The IRS streamlined filing correction through the streamlined procedures replaces this penalty with the much smaller 5% miscellaneous offshore penalty. The IRS Form 3520 penalty guidance is at https://www.irs.gov/forms-pubs/about-form-3520.

What Must Be Reported on Form 3520

Form 3520 requires disclosure of the identity of the foreign estate or donor, a description of each asset received, the fair market value of each asset in US dollars at the date of receipt, and the total value of all amounts received during the tax year. Furthermore, the fair market value of inherited UK assets — property, investments, cash — must be converted to US dollars at the exchange rate on the date of receipt or distribution. Additionally, where the inheritance consists of multiple assets distributed on different dates — property transferred on one date, cash distributions on another — each asset is valued at its own distribution date. Consequently, assembling the correct valuations and distribution dates from the UK estate administration records is the practical first step in preparing Form 3520 — and this information is typically available from the UK solicitor who administered the estate. The IRS Form 3520 instructions are at https://www.irs.gov/forms-pubs/about-form-3520.

Is a UK Inheritance Taxable as US Income?

The General Rule: Inheritances Are Not US Income

Under US domestic law, inherited assets are generally not included in the recipient's gross income — the inheritance is not taxable income for US income tax purposes. Furthermore, this principle applies equally to inheritances from foreign estates — a US citizen who inherits from a UK parent does not pay US income tax on the inherited amount. Additionally, the cost basis of inherited assets for US capital gains purposes is typically the fair market value at the date of the deceased's death — the stepped-up basis rule — meaning any appreciation in the asset's value during the deceased's lifetime is permanently excluded from US capital gains tax. Consequently, a US citizen who inherits a UK property from a parent and subsequently sells it pays US capital gains tax only on the appreciation from the date of death, not from the original purchase price. The IRS inheritance basis guidance is at https://www.irs.gov/taxtopics/tc703.

When Estate Income Is Taxable

Although the inheritance itself is not US income, income earned by the estate during the period of administration — before assets are distributed to beneficiaries — may be taxable on the US return of the beneficiary. Furthermore, where an estate generates income during administration — UK rental income from estate property, UK dividends from estate investments, or UK interest on estate cash — that income may be distributed to beneficiaries as income rather than as capital. Additionally, UK estate income distributed to a US-citizen beneficiary is reported on Schedule B (for interest and dividends) or Schedule E (for rental income) of the beneficiary's Form 1040 for the year of distribution. Consequently, IRS streamlined filing must specifically ask whether the UK estate generated income during administration and whether any income — as distinct from capital — was distributed to the US beneficiary, since this affects the Form 1040 income reporting for the year of distribution.

FBAR Implications of a UK Inheritance

Inherited UK Accounts and the FBAR

Where a UK inheritance includes UK bank accounts, savings accounts, or investment accounts that are transferred to the US beneficiary, those accounts become FBAR-reportable in the year of transfer. Furthermore, the FBAR balance for the inherited accounts must include any balance held in those accounts during the calendar year — including the balance before the transfer date where the account was already beneficially owned by the recipient under the terms of the estate. Additionally, where inherited cash is deposited into an existing UK account — increasing the balance significantly — the FBAR balance for that account reflects the highest balance during the year, including the inheritance receipt. Consequently, IRS streamlined filing must reassess the FBAR position for the year of inheritance receipt — since a large inheritance distribution can significantly increase the aggregate foreign account balance and potentially change the FBAR penalty base calculation.

Inherited UK Property and the FBAR

A UK property inherited from a UK estate is real property — not a foreign financial account — and is not reportable on the FBAR where held directly in the beneficiary's personal name. Furthermore, the inheritance of UK property therefore does not itself create an FBAR obligation. Additionally, where inherited property is subsequently let and rental income is received into a UK account, that rental account becomes FBAR-reportable from the date the rental activity begins. Consequently, the key FBAR question for a UK property inheritance is not the property itself but whether any UK account subsequently used for rental income crosses the aggregate $10,000 threshold. The FinCEN FBAR guidance is at https://www.fincen.gov/financial-crimes-enforcement-network/fbar.

Correcting Prior Years Through the Streamlined Program

How the Streamlined Program Addresses Form 3520 Gaps

The IRS streamlined foreign offshore procedures provide penalty protection for Form 3520 — where it was required but not filed — for the three covered return years. Furthermore, Form 3520 must be included in the streamlined submission for each covered year in which the inheritance was received and exceeded the $100,000 threshold — with the full disclosures required by the form completed accurately. Additionally, the streamlined program replaces the 35% Form 3520 penalty for the covered years with the 5% miscellaneous offshore penalty — calculated on the highest aggregate FBAR balance, not on the inheritance amount. Consequently, the financial savings from addressing a missed Form 3520 through the IRS streamlined filing program rather than through a standalone late filing can be very significant — particularly for large inheritances where the 35% penalty would otherwise be substantial. The IRS streamlined eligibility guidance is at https://www.irs.gov/individuals/international-taxpayers/streamlined-filing-compliance-procedures.

Standalone Amended Return for Isolated Form 3520 Gaps

Where the Form 3520 omission was an isolated error on an otherwise correctly filed US return — and the taxpayer has been filing Form 1040 and FBARs correctly for all other years — a standalone amended Form 1040-X with Form 3520 attached is sometimes more appropriate than the full streamlined program. Furthermore, this approach is accompanied by a reasonable cause statement — explaining that the failure to file was the result of a specific adviser error or a genuine misunderstanding of the specific Form 3520 obligation. Additionally, the IRS reasonable cause exception may waive the Form 3520 penalty entirely where the statement is specific, documented, and credible. Consequently, the choice between the IRS streamlined filing program and a standalone amended return with reasonable cause is a specific judgment that must be made based on the breadth of the non-compliance — whether the Form 3520 gap was isolated or part of a wider filing history that requires the full streamlined correction. The IRS Form 1040-X guidance is at https://www.irs.gov/forms-pubs/about-form-1040x.

Case Study: US Citizen Receives UK Parental Estate

Our team was engaged by a US citizen who had received a distribution from her late mother's UK estate in 2022. Furthermore, the estate included the family home valued at £285,000, a UK investment ISA worth approximately £48,000, and cash savings of approximately £32,000 — a total estate distribution of approximately £365,000, or approximately $446,000 at the distribution-date exchange rate. Additionally, she had received a further interim distribution of £18,000 in 2021 — below the $100,000 threshold and therefore not requiring Form 3520. The 2022 distribution was the only one requiring Form 3520.

She had filed UK self-assessment returns, FBARs, and Form 1040 for all years correctly — but had never heard of Form 3520 and had not filed it for the year of inheritance. Furthermore, since her other filing obligations were fully met, we assessed the Form 3520 omission as an isolated error on an otherwise complete return — supporting a standalone amended return approach with reasonable cause rather than the full IRS streamlined filing program. Additionally, we prepared Form 1040-X for 2022 with Form 3520 attached, reporting the full £365,000 distribution converted to US dollars at the distribution-date rate. The reasonable cause statement specifically addressed the UK solicitor's administration of the estate without any mention of US reporting obligations. Consequently, the IRS accepted the amended return and reasonable cause statement without penalty assessment — a zero penalty outcome compared with the theoretical 35% penalty of approximately $156,100 on the reported distribution.

Common Mistakes With UK Inheritance Reporting

Not Filing Form 3520 Because No US Tax Is Owed

The most widespread misconception is that Form 3520 is not required because inheritances are not US-taxable income. Furthermore, the Form 3520 filing obligation is independent of any tax liability — it is an information return that exists to give the IRS visibility of large foreign asset transfers regardless of their tax treatment. The correct approach requires IRS streamlined filing to assess the Form 3520 obligation for every US citizen who received a foreign inheritance in a prior year — regardless of whether any US tax was due on the receipt. IRS Form 3520 guidance is at https://www.irs.gov/forms-pubs/about-form-3520.

Not Calculating the Dollar Value at the Distribution Date

A common technical error is converting the inheritance to US dollars at the current exchange rate rather than the rate on the actual distribution date. Furthermore, the correct rate is the exchange rate on the date each asset was distributed from the estate — not the current rate or the annual average rate. The correct approach requires confirming the exact distribution date for each asset from the estate administration records and applying the Bank of England or US Treasury rate for that specific date. Using the wrong rate produces an incorrect Form 3520 disclosure.

Not Checking Whether Estate Income Was Also Distributed

Many beneficiaries assume all estate distributions are capital — not realizing that some distributions may include income earned by the estate during administration. Furthermore, UK estate income distributed to a US beneficiary is taxable income on the US return — reported on Schedule B or Schedule E rather than excluded as an inheritance. The correct approach requires a specific review of the estate accounts to identify whether any distribution included income — and, where it did, reporting that income separately on the Form 1040 for the year of distribution.

How US-UK Tax Can Help

At US-UK Tax, our team of Enrolled Agents, Chartered Tax Advisers, and Certified Public Accountants provides specialist IRS streamlined filing services and Form 3520 preparation for Americans who received UK inheritances. Furthermore, we determine the correct Form 3520 filing obligation based on the inheritance value and distribution dates, prepare Form 3520 with the full required disclosures, assess whether the streamlined programme or a standalone amended return with reasonable cause is the more appropriate correction route, draft the reasonable cause statement where applicable, and review the FBAR position for the inheritance year. Additionally, we advise on the US basis of inherited UK assets for future capital gains tax planning.

Contact our team today. Email hello@us-uktax.com, call 0333-8807974, or visit https://www.us-uktax.com/contact/.

Conclusion

A UK inheritance exceeding $100,000 creates a Form 3520 filing obligation for every US citizen who receives it — regardless of whether any US income tax is owed on the receipt. Furthermore, the IRS streamlined filing program provides penalty protection for the 35% Form 3520 penalty for the three covered return years — and where the Form 3520 omission was an isolated error on an otherwise correct return, a standalone amended return with reasonable cause may eliminate the penalty. Moreover, the inheritance itself is not US taxable income — but estate income distributed alongside the capital must be separately identified and reported on the beneficiary's Form 1040. Contact US-UK Tax at hello@us-uktax.com or call 0333-8807974 today.

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FAQs

Q: Is a UK inheritance taxable income in the United States?

A: No. Inheritances are not included in US gross income regardless of whether they come from a UK or US estate. However, Form 3520 must be filed where the foreign inheritance exceeds $100,000 in a single tax year — a reporting obligation that exists independently of any income tax liability.

Q: What is Form 3520 and when must it be filed?

A: Form 3520 is an annual information return for US persons who receive foreign inheritances or gifts exceeding $100,000. It is due on the same date as the Form 1040 — 15 April — with an extension to 15 October. The penalty for failure to file is the greater of $10,000 or 35% of the gross reportable amount.

Q: Does the $100,000 threshold apply per year or per estate?

A: Per calendar year. All amounts received from foreign persons during the tax year are aggregated. Where the total exceeds $100,000, Form 3520 must be filed for that year. Distributions received in different tax years are assessed separately against the threshold for each year.

Q: Can I correct a missing Form 3520 through the streamlined program?

A: Yes, for the three covered return years — provided the non-compliance was non-wilful. The streamlined program provides Form 3520 penalty protection for the covered years, replacing the 35% penalty with the 5% miscellaneous offshore penalty on the FBAR balance. Where the omission was isolated on an otherwise correct return, a standalone amended return with reasonable cause may be more appropriate.

Q: What is the basis of inherited UK assets for US capital gains purposes?

A: The fair market value at the date of death — the stepped-up basis rule. Any appreciation in the asset during the deceased's lifetime is permanently excluded from US capital gains tax. Capital gains tax applies only to appreciation from the date of death to the date of eventual sale by the beneficiary.

Q: Is estate income distributed with a UK inheritance also tax-free?

A: No. While the inherited capital is not US income, income earned by the estate during administration — rental income, dividends, interest — and distributed to beneficiaries is taxable income on the beneficiary's US return. It must be reported on Schedule B or Schedule E for the year of distribution.