IRS Streamlined Domestic Offshore Procedure: State Returns
IRS Streamlined Domestic Offshore Procedure fixes your federal returns, but your state follows. See which state amendments apply after London. Talk to us.
The IRS Streamlined Domestic Offshore Procedure corrects three federal returns, but it does not touch your state. Once omitted ISA, brokerage or UK rental income raises federal AGI, most states with an income tax expect an amended state return within a fixed window, with no treaty relief, often no foreign tax credit, and full state interest.
That is the part of a London-to-New-York (or London-to-California) clean-up that most published guidance skips. The federal package is well documented: three amended Forms 1040-X, six years of FBARs, Form 14654 and the 5% miscellaneous offshore penalty. What follows that package, quietly and on its own timetable, is a set of state filings that can carry a materially different tax result from the federal one. This guide sets out how we prepare those state filings at Jungle Tax for clients who have come home after years in the UK, and where the state answer diverges from the federal one.
What does the Streamlined Domestic Offshore Procedure actually fix?
The Streamlined Domestic Offshore Procedures (SDOP) are the IRS route for US residents whose failure to report foreign income and foreign accounts was non-willful. Under the IRS instructions for US taxpayers residing in the United States, the submission comprises:
- Amended returns for the three most recent years whose due date has passed, on Form 1040-X, each marked "Streamlined Domestic Offshore" in red at the top of the first page, with any missing information returns (Forms 8938, 5471, 8621, 3520 and similar) attached.
- Delinquent FBARs for the six most recent years, filed electronically through FinCEN’s BSA E-Filing System, with "Streamlined Filing Compliance Procedures" given as the reason for late filing.
- Form 14654, the US-resident certification of non-willful conduct, with a narrative explaining why the omissions occurred.
- Payment of the additional tax, statutory interest and the Title 26 miscellaneous offshore penalty, equal to 5% of the highest aggregate year-end balance of the foreign financial assets that were unreported or whose income was unreported.
Eligibility turns on two things: you must fail the non-residency test that would put you into the Foreign Offshore Procedure instead, and you must have filed original federal returns for the covered years. SDOP amends returns; it does not accept delinquent originals. For an American who moved back from London partway through the covered window, the domestic version is usually the one that applies, because the year of return will rarely show the 330 full days abroad that the foreign procedure demands.
Completing SDOP closes the federal exposure: accuracy-related, information-return and FBAR penalties are replaced by the single 5% charge. It says nothing about state income tax, and the IRS submission is not a filing with any state.
Why does an SDOP amendment trigger state returns?
Every state that taxes individual income starts its calculation from a federal figure: federal AGI in New York, Massachusetts and Connecticut, and federal AGI subject to California’s own adjustments. When three Forms 1040-X raise that starting figure, the state return built on it is now wrong for the same three years. State law generally treats the change as one the taxpayer must report, whether it arises from an IRS audit or from the taxpayer’s own amended federal return.
Three features make the state side different in kind, not just in amount:
- There is no state streamlined programme. No state has an analogue of the 5% offshore penalty, and no state administers FBARs, which are a federal Bank Secrecy Act filing. The state consequence is ordinary: additional tax, interest from the original due date and, depending on the state, potential late-payment penalties.
- The US-UK treaty is a federal instrument. Several states, California most prominently, do not follow treaty positions. Treaty-based relief claimed on the federal return generally does not carry into the state calculation.
- Foreign tax credits rarely exist at state level. The federal Form 1116 credit for UK tax on UK rental income has no general counterpart in New York, California, Massachusetts or Connecticut, whose resident credits are designed around taxes paid to other US jurisdictions.
How do the omitted UK items look federally and at state level?
The table below compares how the typical London-era items are treated by HMRC, by the IRS through SDOP, and by a high-tax state on the amended return. It is a preparation map, not a planning tool.
| Item | UK / HMRC treatment | US federal (SDOP amendment) | Typical state treatment |
|---|---|---|---|
| Stocks and shares ISA dividends and interest | Tax-free inside the wrapper; not reported on Self Assessment | Fully taxable; the wrapper is not recognised. UK funds inside it may be PFICs requiring Form 8621 | Taxable in full for resident periods; no wrapper relief |
| UK general investment account gains | Capital gains tax for UK-resident years, subject to the annual exempt amount | Capital gain on Schedule D (or PFIC excess-distribution treatment for UK funds); FTC available for UK CGT paid | Taxed as ordinary state income in most high-tax states; usually no credit for UK CGT |
| UK rental income | Taxable in the UK, including for non-residents under the Non-Resident Landlord Scheme | Schedule E with US depreciation rules; Form 1116 credit for UK income tax paid | Taxable for resident periods; UK tax generally not creditable, so state tax lands on top |
| Foreign account reporting | No equivalent disclosure for UK residents | FBAR (FinCEN 114) and Form 8938 | No state analogue |
| Penalty for the omission | Not applicable to US reporting | 5% miscellaneous offshore penalty in lieu of other penalties | No analogue; interest and possible ordinary state penalties |
Were you a state resident during the London years?
This is the question that sets the size of the state bill, and it is distinct from the federal question. Federally you were taxable on worldwide income throughout, because the US taxes citizens. A state taxes worldwide income only for the period in which it treats you as a resident.
Domicile versus statutory residency
Most high-tax states have two routes to residency. Domicile is your permanent home, the place you intend to return to; it does not change merely because you spend years abroad. Statutory residency catches a non-domiciliary who keeps a permanent place of abode in the state and spends more than a threshold number of days there. An American who kept a Manhattan apartment or a Connecticut house while working in London may have remained domiciled in that state throughout.
Some states soften this for genuine absences. New York, for example, has a rule under which a domiciliary who spends a sustained period abroad, with strictly limited days in the state, can be treated as a nonresident for that period. California has an employment-related safe harbour for absences under an employment contract, which is unavailable where income from intangibles exceeds a statutory ceiling. Both carry precise day counts and conditions that we confirm year by year against the client’s travel record; they are not assumptions to make from memory.
The year you came back
In the year of return, most clients are part-year residents. The state then taxes worldwide income received during the resident period, and only state-source income for the nonresident period. UK rental income and ISA dividends received while you were still a London resident are not usually source income for a US state, so the split of each SDOP adjustment between the two periods matters. We allocate each omitted item by the date it was received or accrued, not pro rata by days, wherever the records allow.
If you were domiciled throughout
Where a state treated you as a resident for the London years and you filed nonresident returns or none at all, the issue extends beyond the three SDOP years. State limitation periods generally do not begin to run on a year for which no return was filed, so an unfiled resident year can remain open indefinitely. That is a state compliance gap in its own right, prepared separately from the SDOP amendments.
Federal first, then state: the filing sequence
We prepare the two layers together but file them in a fixed order, because the state figures depend on the final federal numbers.
- Reconstruct the federal position. Gather ISA, brokerage and bank statements for the six FBAR years and the three tax years; obtain UK Self Assessment returns and HMRC calculations for the rental income; convert to dollars at a consistent, documented rate.
- Classify each UK holding. Identify UK funds that are PFICs, which changes both the federal computation and, in some states, the state computation.
- Prepare the three Forms 1040-X, the six FBARs, Form 14654 and the penalty computation. File the FBARs electronically and mail the paper package to the IRS Streamlined Domestic Offshore unit in Austin, Texas.
- Settle the residency position for each covered year. Full-year resident, part-year resident or nonresident, with the domicile analysis documented.
- Carry the federal AGI change into each state return. Strip out treaty positions the state does not follow, remove the federal foreign tax credit, apply any state-specific modifications and allocate part-year items.
- File the amended state returns within the state’s window. California uses Form 540X; New York uses IT-201-X (resident) or IT-203-X (part-year or nonresident); Massachusetts and Connecticut use their amended resident and nonresident returns. Each state measures its window from the federal filing or final determination.
- Pay state tax and interest with the return. State interest runs from each original due date and continues until payment.
- Keep the file together. If the IRS later adjusts the SDOP returns, that is a further federal change the states will expect to see.
How long do you have to amend the state return?
Each state sets its own deadline, and the deadlines differ. They commonly run from about 90 days to a year, measured from the date of the amended federal return or the IRS’s final determination. California and New York both impose specific reporting windows after a federal change, and Massachusetts and Connecticut have their own. Missing the window does not merely risk a penalty: in several states, failing to report a federal change keeps the state’s assessment period open for the affected year. We confirm the exact rule for each state at the time of filing, and we treat the SDOP mailing date as the start of the clock.
Worked example: a federal SDOP amendment flowing to a New York return
Illustrative only. The figures below are invented to show the mechanics; they are not a calculation of any individual’s liability, and the state rate is an assumed combined marginal rate.
A US citizen executive spent nine years in London and moved back to Manhattan on 1 September 2023, filing federal returns throughout but reporting only US-source and UK employment income. The omissions: dividends and interest inside a stocks and shares ISA, a gain on a UK general investment account in 2024, and net rental income from a flat in Kensington retained after the move. For 2023 she is a part-year New York (and New York City) resident; for 2024 and 2025 she is a full-year resident.
| Item (USD, illustrative) | 2023 | 2024 | 2025 |
|---|---|---|---|
| ISA dividends and interest (full year) | 12,000 | 13,000 | 14,000 |
| UK investment account gain | 0 | 85,000 | 0 |
| UK rental, net after US depreciation | 20,000 | 21,000 | 22,000 |
| Increase to federal AGI | 32,000 | 119,000 | 36,000 |
| UK tax paid on rental (federal FTC via Form 1116) | 4,000 | 4,200 | 4,400 |
| Amount taxable by New York (resident period only in 2023) | 10,700 | 119,000 | 36,000 |
| Additional NY State and City tax at an assumed 13.5% combined rate | 1,445 | 16,065 | 4,860 |
Points the example is designed to show:
- The 2023 allocation. Of the 2023 ISA income, $4,000 was received after 1 September, and $6,700 of the rental income relates to the resident months, so only $10,700 enters the New York part-year computation. A day-count pro rata would have produced a different figure; receipt-date allocation is more defensible when the records support it.
- No credit for UK tax. Federally, the UK tax on the rental income largely offsets the US tax on it through Form 1116. New York gives no equivalent credit, so the state tax on the rental is an outright addition.
- The 5% penalty stays federal. Suppose her highest aggregate year-end balance across the ISA, the investment account and a UK current account was $1,125,000. The federal penalty is $56,250. The Kensington flat is real property held directly, not a foreign financial asset, so it is outside the penalty base. New York imposes nothing comparable; its exposure is the tax shown above, plus interest from each original April due date.
- Two filings per year. She files IT-203-X for 2023 and IT-201-X for 2024 and 2025, each reflecting the amended federal AGI, within New York’s reporting window after the SDOP package is mailed.
Had she moved to California instead, the shape would be the same but two details would shift: California applies its own rate schedule to capital gains as ordinary income, and California’s non-conformity to several federal provisions can change the starting figure, so the California adjustment is rarely just "federal increase times rate".
State-by-state points for the four most common destinations
New York
Requires a report of federal changes within a set period, made on the amended resident or part-year return. New York City residents carry the city tax on the same base. The domicile analysis for London years is often the deciding issue, particularly where a New York apartment was retained.
California
The Franchise Tax Board requires an amended return after a federal change that affects California tax, within a statutory window. California does not follow tax treaties, does not allow a credit for UK income tax and does not conform to every federal provision, so the state computation is rebuilt rather than scaled. Residency for the London years depends on the facts and, potentially, on the employment-contract safe harbour.
Massachusetts
The Department of Revenue expects an amended return reflecting a federal change within its own period. Massachusetts taxes different classes of income at different rates and has a surtax on very high incomes, so a large UK gain in a single year needs to be placed carefully within its income classes.
Connecticut
The Department of Revenue Services requires an amended return after a federal change within a defined window. Connecticut’s computation begins from federal AGI, and its credit for taxes paid to other jurisdictions is directed at US states, not the UK.
What about the UK side?
SDOP is a US procedure and has no effect on your HMRC position. If the omitted items were correctly treated in the UK while you lived there, nothing changes: ISA income was exempt, UK gains were within capital gains tax and rental income was on your Self Assessment return. The UK points that tend to surface during an SDOP review are:
- ISA status after leaving. Under HMRC rules you can keep an existing ISA after moving abroad, but you cannot add new subscriptions while non-resident (see gov.uk guidance on ISAs if you move abroad). The US continues to tax the income every year you hold it.
- Continuing UK rental. A retained London flat remains within UK income tax, now under the Non-Resident Landlord Scheme (see gov.uk guidance on tax on UK rental income when you live abroad). That UK tax is creditable federally but, as above, generally not against state tax.
- The year you left. Split-year treatment under the Statutory Residence Test can divide the UK tax year of departure. The UK year (6 April to 5 April) and the US calendar year do not line up, so the dollar figures used for the Form 1116 credit must be reconciled to the correct UK periods.
Where a UK Self Assessment return was itself missed, that is a separate HMRC filing that our UK tax team prepares alongside the US work; it is not cured by anything filed with the IRS.
Common errors we see in state filings after SDOP
- Filing nothing with the state on the assumption that the Streamlined certification covers it. It does not.
- Carrying the federal foreign tax credit into the state return by copying federal tax after credits rather than recomputing from AGI.
- Treating the London years as automatically nonresident for a state where the client remained domiciled.
- Pro-rating part-year income by days when receipt dates would give a more accurate and more defensible allocation.
- Ignoring PFIC classification at state level, where some states follow the federal computation and others start from different figures.
- Letting the state window lapse while waiting for an IRS acknowledgement that, under SDOP, may never arrive as a formal closing letter.
Preparing the full package
For most returning executives and founders, the right sequence is a single engagement: the federal SDOP package (amended returns, information returns, FBARs, Form 14654 and the penalty computation) prepared alongside the amended state returns for the same years, with the residency position documented once and applied consistently. Our US tax return team prepares both layers, and the FBAR penalty calculator is a useful first look at what the federal exposure would have been outside the Streamlined route. Clients with substantial UK portfolios will find more on our high-net-worth practice.
If you have moved back from London and suspect your federal returns left out ISA, brokerage or UK rental income, the state returns are not an afterthought; they are part of the same correction and carry their own deadlines. To arrange a confidential review of your federal and state position, contact our cross-border team.
