IRS Streamlined Filing Experts: The State Returns Gap

A streamlined submission is a federal remedy and nothing more. The IRS has no authority over state income tax, no state is bound by your Form 14653 certification, and none of the federal penalty relief crosses the state line. If a US state still treats you as one of its residents, those unfiled state years sit entirely outside the programme you just completed.

This is the single most common blind spot we see in half-finished catch-ups. The client instructs IRS Streamlined Filing Experts, the federal pack goes in, the acknowledgement arrives, and the matter is treated as closed. Two years later a Franchise Tax Board or Department of Taxation and Finance notice lands at a UK address, quoting a tax year the client believed had been dealt with. At Jungle Tax we scope the state position at the outset of every streamlined engagement, precisely because the state exposure is the part that can outlive the federal fix.

Why do the IRS streamlined procedures do nothing at state level?

The streamlined filing compliance procedures are a creature of federal administrative practice. The IRS publishes the terms, the IRS accepts the returns, and the IRS agrees not to assert specified federal penalties where the taxpayer certifies non-wilful conduct. Read the IRS guidance on the streamlined filing compliance procedures from beginning to end and you will not find the word "state" used in the sense of a US state's own income tax. That is not an oversight. It is a jurisdictional fact.

Three points follow, and they matter more than they first appear:

• The IRS cannot bind a state. California, New York, Virginia, South Carolina, New Mexico and every other taxing state administer their own income tax under their own statute. A federal administrative programme cannot waive a state penalty, shorten a state assessment period, or extinguish a state filing obligation.
• There is no state equivalent of streamlined. Some states operate voluntary disclosure agreements, and a few of those are genuinely useful. But they are separate programmes, with separate eligibility rules, separate look-back periods and separate disqualifiers. Several are drafted for out-of-state businesses and entities rather than for former resident individuals, which is exactly the wrong shape for a departing executive or founder.
• The non-wilfulness certification travels nowhere. Form 14653 is a federal document supporting a federal claim. A state auditor is not obliged to accept it, and in our experience will read it as a helpful narrative admission that returns were not filed rather than as a defence.

So the correct mental model is not "the streamlined submission fixes my US position". It is "the streamlined submission fixes my federal position, and the state position is a second, parallel workstream that has to be scoped separately and may be governed by harsher rules".

What exactly does a streamlined pack cover, and where does the coverage stop?

Set out plainly, the boundary looks like this. The precise year counts and penalty terms should always be confirmed against current IRS guidance for your facts, but the shape of the gap does not change.

Element	Federal streamlined submission	US state position
Authority	IRS administrative programme	Each state's own revenue authority and statute
Income tax returns	Three most recent delinquent or amended federal years	Every open year in which the state asserts residency or source income
Foreign account reporting	Six years of FBARs (FinCEN Form 114), plus Forms 8938, 5471, 8621 as applicable	No equivalent; but state returns generally start from federal AGI, so the corrected federal figures flow through
Penalty relief	Specified federal penalties not asserted where the certification is accepted	None automatically; relief only under that state's own programme, if one applies to you
Non-wilfulness certification	Form 14653 (foreign) or Form 14654 (domestic)	Not recognised; state has its own reasonable cause standard
Assessment period once returns are filed	Generally three years, extended in defined circumstances	Varies by state; several run three or four years once a return is filed
Assessment period where no return was ever filed	The federal limitation period does not begin to run until a return is filed	In a number of states, the authority may assess at any time — indefinitely
Treaty protection	US/UK treaty applies to the federal income taxes covered by Article 2	State income taxes fall outside the taxes the treaty covers

The last two rows are where the real damage sits, and we return to both below.

Which states keep claiming you after you have moved to the UK?

Two independent hooks can keep a state in your life: domicile and statutory residence. Domicile is the sticky one — it is the home you intend to return to, it survives a move abroad, and it is not abandoned merely by acquiring a UK flat and a UK national insurance number. Statutory residence is mechanical, turning on maintaining a dwelling in the state and counting days.

We have already published a full treatment of how to break state residency on departure, including the evidence auditors actually credit and how to sequence an exit around a liquidity event: see our guide to US state tax residency exit for California and New York movers. This guide is deliberately the other end of the same problem — the years that were never filed, surfacing during a federal catch-up — so we will not restate the residency tests from scratch. Two authoritative anchors are worth having in front of you, however, because they define the questions a state auditor will actually ask.

New York's two routes to resident status

New York's own published definitions confirm that you are a resident for a tax year if your domicile is New York State, or if you maintain a permanent place of abode in New York for substantially all of the year and spend 184 days or more in the state. New York also publishes narrow escape routes for those who remain domiciled in New York but genuinely live abroad — including a foreign-day test requiring, in broad terms, 450 days in a foreign country within a 548-day period with tightly capped New York days. The detail matters and the tests are unforgiving; the state's income tax definitions are the primary source.

California's domicile-plus-safe-harbour structure

California separates residence from domicile and taxes residents on worldwide income. For an individual who remains California-domiciled but is abroad under an employment-related contract, the state publishes a safe harbour built on an uninterrupted absence of at least 546 consecutive days, set out in FTB Publication 1031, Guidelines for Determining Resident Status. Founders and partners who left on their own account rather than under a contract of employment frequently do not fit it, and often assume, wrongly, that the physical fact of living in London does the work by itself.

There is a second limit on that safe harbour that matters far more to a wealthy reader, and it is routinely overlooked. Publication 1031 states that the safe harbour applies unless the individual has intangible income exceeding $200,000 in any taxable year during which the employment-related contract is in effect, or the principal purpose of the absence is the avoidance of personal income tax. Intangible income is the investment income our clients typically have most of — interest, dividends and gains on securities. For a high-net-worth filer, that threshold is not a remote edge case; it is the likely outcome. The practical consequence is that the safe harbour many departing Californians believe protects them may simply be unavailable, leaving residency to be determined on the ordinary facts-and-circumstances basis instead. The same publication also treats return visits of no more than 45 days in a taxable year as temporary, and is explicit that days spent abroad under two separate contracts cannot be added together to reach the 546.

The practical difficulty is evidential. Proving you left is not the same as leaving. Where the state file shows a retained home, a driving licence, voter registration, professional licences, a US mailing address on brokerage statements, school-age children in state, or a business address that never changed, the burden of proof is a real obstacle — and it grows heavier as the years pass and the documentary trail cools.

Why can the state exposure outlive the federal fix?

This is the point that reframes the engagement for most clients.

At federal level, the limitation period on assessment does not begin to run until a return is filed. The whole architecture of a streamlined submission is to file the delinquent years and start that clock. Once the three federal years and six FBAR years are in and accepted, the federal exposure is bounded and ageing out.

At state level, the equivalent clock may never start. As a matter of general principle, a number of states provide that where no return was filed for a year, the authority may issue an assessment at any time — there is no limitation period at all. That is materially worse than the federal three-year and six-year rules, and it applies to precisely the years a departing filer is most likely to have skipped: the year of departure and the first two or three years abroad.

Two states publish the position on their own websites. California's Franchise Tax Board states that where a return was not filed for a tax year it can issue its assessment at any time, against a general four-year period where a return was filed. New York's assessment limitation statute follows the same pattern: a general three-year period once a return is filed, with no limitation where no return was filed. Both should be verified for your specific years and tax types before you rely on them, and the position in other states differs — which is exactly why a state scoping exercise is not optional.

The consequence is uncomfortable but simple. A client can complete a federal streamlined submission, watch the federal years close, and still be carrying an open, unlimited state assessment risk for the same period, indefinitely, until either a return is filed or a formal agreement is reached.

Does the streamlined submission itself create the state exposure?

It does not create it. It frequently surfaces it, and that distinction is worth being honest about with clients.

A completed federal pack produces a coherent, dated, signed record showing that a named individual with a specific former state address had unreported worldwide income across identified years, with an explanation of why nothing was filed. Federal and state authorities exchange taxpayer data under long-standing information-sharing arrangements. Third-party reporting — Forms W-2, 1099, K-1 and brokerage statements — often continues to carry an old state address for years after departure. Where the federal picture changes, the state's own data-matching is capable of noticing.

The correct response is not to delay the federal filing. It is to scope the state position before the federal pack goes in, so that the state answer is designed rather than discovered. A client who knows their state exposure is nil, or is quantified and provisioned for, is in a completely different position from one who receives a notice with no analysis behind them.

Why do FEIE, foreign tax credits and the treaty not rescue the state years?

Clients reasonably assume that if they paid substantial UK tax on the same income, the state position must wash out. It usually does not, for three separate reasons.

• Most states do not follow the foreign earned income exclusion. State conformity to the Internal Revenue Code is selective and varies state by state. A federal return showing excluded foreign earnings can sit alongside a state computation that includes the same earnings in full.
• State credits for foreign tax are the exception, not the rule. Many states give a resident credit for tax paid to other US states, not to foreign countries. HMRC tax paid on a London salary may therefore relieve the federal charge through the foreign tax credit while doing nothing at all for the state charge.
• The treaty does not bind the states. The US/UK double taxation convention applies to the taxes it identifies in its "taxes covered" article, which on the US side are the federal income taxes. State income taxes fall outside it. There is no treaty tie-breaker, no treaty-based residence argument and no treaty credit to deploy against a state assessment.

The result is a genuine risk of economic double taxation on the state slice of the liability — the cross-border interaction that generalist state-tax pages and generalist streamlined pages both tend to miss, because each is written from one side of the Atlantic.

What is the UK/HMRC side of a US state assessment?

This is where UK-resident clients need specific advice rather than a general rule, and where our cross-border tax planning team does the heavier lifting.

Question	US federal	US state	UK / HMRC
Basis of the charge on a UK-resident US citizen	Citizenship-based; worldwide income	Domicile or statutory residence under state law; typically worldwide income if resident	UK residence under the Statutory Residence Test; worldwide income for those taxed on the arising basis
Treaty relief available	Yes — US/UK convention applies to the federal income taxes covered	No — state income taxes are outside the taxes covered	Treaty relief and, separately, UK domestic unilateral relief
Credit for the other country's tax	Foreign tax credit for UK tax, subject to limitation	Generally no credit for foreign tax; check the specific state	Foreign Tax Credit Relief; HMRC confirms relief is usually available even where there is no agreement
Catch-up mechanism for missed years	Streamlined filing compliance procedures	State voluntary disclosure agreement, if eligible; otherwise plain delinquent filing	HMRC digital disclosure service or the Worldwide Disclosure Facility, as appropriate
Assessment window where nothing was filed	Runs only from the date the return is filed	In several states, open indefinitely	Extended discovery windows apply, longest for deliberate behaviour and offshore matters

On the UK side the live question is whether a US state income tax charge can be relieved in the UK at all. Treaty credit is unavailable because the state tax is not a covered tax. UK domestic unilateral relief is a separate statutory route, and GOV.UK's guidance on being taxed twice on foreign income confirms that relief is usually still available even where no agreement covers the tax. Whether that route is open on your facts — the nature of the income, the source country analysis, the year in question — needs to be tested case by case, and it should be tested before a state assessment is settled, not after.

If the UK returns are also incomplete, the two disclosures must be planned together rather than sequentially, for the same reason we set out in our guide to missed UK tax returns and HMRC disclosure alongside an IRS streamlined submission: the numbers in each disclosure have to be capable of surviving inspection by the other authority.

How should the state position be scoped and sequenced in a real engagement?

The following is the sequence we run. It is deliberately front-loaded, because every option that involves negotiated relief is available only while the state has not yet contacted the taxpayer.

Step 1 — Identify every state with a colourable claim, not just the last one

The last state of residence is the obvious candidate. It is rarely the only one. Also test: a state where a home was retained, a state where an operating business or LLC remains registered, a state where rental property sits, a state whose partnership issues K-1s, and any state that received wage or equity reporting during the years under review.

Step 2 — Fix the departure date on the evidence, not on the client's recollection

Flight records, lease and completion dates, UK employment start, school enrolment, licence surrender, voter registration cancellation, and the date each financial institution's address was changed. This file is built once and used for both the federal narrative and any state position.

Step 3 — Determine, per state and per year, whether a return was required

Residency is only one trigger. Source income — rents, gains on in-state real property, in-state business income, partnership allocations, and in several states deferred compensation and equity vesting attributable to in-state work — can require a non-resident return from someone who genuinely broke residency years earlier.

Step 4 — Establish the assessment position for each open year

Specifically: was a return filed for that year, and does that state run an unlimited assessment period where none was? This determines whether the exposure is bounded or perpetual, and therefore whether it must be dealt with now.

Step 5 — Test eligibility for that state's voluntary disclosure route before contact

State programmes vary considerably. Some are confined to out-of-state entities and their owners rather than individuals who were once resident. Some offer a limited look-back period in exchange for full disclosure. Almost all share one disqualifier: you cannot apply once the state has issued a notice or opened an examination for that tax type and year. New York publishes its Voluntary Disclosure and Compliance Program terms, including the limited look-back mechanism and the bar on applying while under audit or after a bill. Californian relief programmes are narrower than most clients expect and should be checked against the Franchise Tax Board's own published eligibility rules rather than assumed.

Step 6 — Sequence the state filings against the federal pack

State computations generally begin from federal adjusted gross income. Filing a state return on figures that will change when the federal streamlined pack is processed guarantees an amendment and invites a second look. In most engagements the federal numbers are finalised first, the state returns are prepared in parallel on those finalised figures, and both are lodged within a controlled window — with the state voluntary disclosure application made first where one is available, because that is the step that can be lost by delay.

Step 7 — Provision, and close the position formally

Quantify state tax, interest and penalties as a distinct line from the federal exposure. Interest at state rates over an eight or ten-year unfiled period is frequently the larger number, and clients who have provisioned only for the federal outcome are the ones who react badly. Where a formal agreement is available, take it: an agreement that fixes a look-back period converts a perpetual liability into a finite one, which is the entire point of the exercise.

What does this look like in practice?

A recognisable pattern, with details generalised: a technology founder leaves a high-tax state for London, keeps the family home let out for three years "in case it doesn't work out", retains the state driving licence, and does not file anything anywhere for four years. The federal catch-up is straightforward — three years of returns, six years of FBARs, a clean non-wilfulness narrative, no federal penalty asserted.

The state analysis is the opposite. The retained home and the absence of any positive act of abandonment leave domicile arguable for at least the first two years. No state return was ever filed for any of the four. The rental income alone would have required a non-resident return even on the client's own view of when residency ended. And because no return was filed, the state's assessment window on those years may never have opened at all. The federal work took twelve weeks; the state work determined the size of the cheque.

Common failure modes we are asked to repair

• Assuming the federal acknowledgement closes the matter. It closes the federal matter. Nothing else.
• Filing state returns on draft federal figures that later change, producing amendments that draw attention to the very years in question.
• Contacting the state informally to "ask a question" before eligibility for a voluntary disclosure route has been tested, and losing that route.
• Relying on the treaty or the foreign tax credit to neutralise a state charge that the treaty does not reach.
• Ignoring trailing source income — rents, K-1s, deferred compensation and equity vesting attributable to in-state work — on the basis that residency ended.
• Treating the certification narrative as portable. The federal narrative is written for a federal audience and should be reviewed for how a state auditor would read it before it is signed.

Getting the whole picture, not half of it

A streamlined submission is the right instrument for the federal problem and we prepare a great many of them — see our note on what a streamlined filing specialist actually prepares for the mechanics. But it was never designed to answer the state question, and for high-net-worth clients leaving California, New York and their peers, the state question is often the one with no expiry date attached. Our high-net-worth team scopes both in a single engagement, and the wider federal framework is set out in the IRS guidance for US citizens and resident aliens abroad.

If you are part-way through a catch-up, or you have completed one and no one has ever asked you which state you left, that is the conversation to have now — while every relief route is still open. Contact our cross-border team for a confidential, privileged discussion of your federal and state position. We will tell you plainly whether you have a state problem, how large it is, and whether it can still be closed on terms.