Can an Accidental American file a US tax return without a Social Security number?

Not in any way that the IRS will process. A return submitted without a valid identifying number cannot be matched to a taxpayer account and does not start a filing history. The correct response to time pressure is to begin the Social Security number application immediately and prepare everything else in parallel while it processes.

Can I use an ITIN instead of applying for a Social Security number?

No. IRS.gov describes an ITIN as being for individuals who are not eligible for a Social Security number, and a US citizen is always SSN-eligible regardless of how long they have lived outside the United States. The ITIN route stays open only for a non-US spouse or children who appear on your return, not for you as the citizen.

How do I apply for a Social Security number if I have never lived in the US?

You apply on Form SS-5-FS through the Federal Benefits Unit at the US Embassy in your country of residence, such as London for UK-based applicants. SSA requires anyone aged twelve or older to attend an in-person interview, so book the appointment as early as possible, since it is typically the longest step in the process.

Can I start the streamlined filing procedure before my SSN arrives?

You can prepare the returns, FBARs and Form 14653 narrative in advance, but the streamlined package itself cannot be submitted until the Social Security number is issued. IRS.gov confirms every streamlined return must carry a valid Taxpayer Identification Number, so the submission date depends entirely on when the number arrives.

Will I owe US tax if I have already paid tax in the UK?

Often very little or nothing. The foreign earned income exclusion and the foreign tax credit generally offset US tax on income already taxed in the UK, since UK tax rates are frequently at or above the equivalent US rates. What usually remains is a reporting obligation rather than a payment obligation, though this depends on the specific income and asset mix involved.

Does renouncing US citizenship let me skip the SSN and streamlined process?

No, it requires the opposite. Expatriation on Form 8854 generally requires certifying five years of prior US tax compliance, so an Accidental American must complete the Social Security number application and the streamlined catch-up first before renunciation becomes available as an option.

Accidental American With No SSN: How to File US Taxes

An Accidental American who has never held a Social Security number cannot file a US tax return at all until that number exists, because the return has nowhere valid to put an identifying number and the IRS will not process one without it. The practical answer is a sequence, not a form: establish documentary proof of US citizenship, apply to the Social Security Administration from abroad on Form SS-5-FS, and only once the number is issued prepare and submit catch-up returns, usually through the Streamlined Filing Compliance Procedures. IRS.gov is explicit that all returns filed under the streamlined procedures must carry a valid Taxpayer Identification Number, and for a US citizen that number can only ever be a Social Security number, never an ITIN. Everything that follows in this article works through that ordering, including what to tell a UK bank that wants a US taxpayer number you do not yet have.

What is an Accidental American, and why do you have to file?

An Accidental American is someone who holds US citizenship without having sought it, usually through one of two routes. The first is birth on US soil: a child born in a US hospital while parents were there on secondment, study or holiday acquires citizenship automatically and keeps it, regardless of how briefly the family stayed. The second is birth abroad to a US citizen parent, which passes conditionally rather than automatically, subject to the parent having been physically present in the United States for a set period before the birth. Because the United States taxes citizens on worldwide income regardless of where they live, both routes create a US filing obligation that has nothing to do with ever having worked, banked or held a passport there. The obligation exists the moment citizenship exists, and it does not fade with distance or time.

For most Accidental Americans in the UK, the citizenship question needs settling as documentary fact before any tax work begins. A US birth certificate, an American passport, a Consular Report of Birth Abroad, or a Certificate of Citizenship from USCIS are the usual proofs, and the Social Security Administration and the State Department generally require originals or certified copies rather than photocopies or notarised copies. Where citizenship passed through a parent, the supporting evidence is often the parent's history rather than the child's, since the physical-presence test applies to the parent's life, not the applicant's. Sorting out which document you can realistically obtain, and how quickly, is usually the first practical task, well before any tax form is drafted.

SSN or ITIN: why a citizen cannot use an ITIN

This is the most common misunderstanding we see at a first meeting. IRS.gov states that an Individual Taxpayer Identification Number is for someone who needs a federal tax identifying number but who does not have, and is not eligible to get, a Social Security number. A US citizen is always SSN-eligible, however many decades have passed with no contact with the United States, which places citizens outside the ITIN population entirely. Filing a Form W-7 for yourself as a citizen is not a workaround; it is an application for a number you are not entitled to hold. The ITIN route stays firmly open, however, for a non-US spouse or non-US children who appear on your return, since Form W-7 exists precisely for family members who are not citizens and are not otherwise eligible for an SSN. Their identification numbers are a separate, later step, not a substitute for yours.

How do you get a Social Security number from abroad?

You apply on Form SS-5-FS, the version of the Application for a Social Security Card designed for use outside the United States, rather than the domestic SS-5. In the UK, applications are handled through the Federal Benefits Unit at the US Embassy in London, and SSA requires anyone aged twelve or older applying for an original number to attend an in-person interview, so booking that appointment early is usually the binding constraint on the whole project. Processing windows quoted by the Embassy are approximate and worth reconfirming directly with SSA.gov and the Embassy before building a timetable around them. A first, often overlooked step: anyone born in a US hospital from 1989 onward may already have been assigned a number automatically at birth through SSA's Enumeration at Birth programme, so a records search to check for a dormant number should come before assuming a fresh application is needed.

A completed Form SS-5-FS, with every question answered, including any previous names and both parents' full names as recorded on the birth document.
Evidence of US citizenship: a certified US birth certificate, a US passport, a Consular Report of Birth Abroad, or a Certificate of Citizenship.
Evidence of identity showing your name, date of birth and, ideally, a photograph, such as a current British passport or UK driving licence.
Evidence of any name change since birth, such as a marriage certificate or deed poll, so SSA can trace the record from birth to current identity.
Support for the fact that no Social Security number was previously assigned, particularly relevant for anyone born after 1989.
Originals or copies certified by the issuing authority; SSA does not accept photocopies or notarised copies.

Why the streamlined procedure has to wait for the taxpayer ID

The Streamlined Filing Compliance Procedures are the route most Accidental Americans use to catch up, because the failure to file was genuinely non-willful: nobody explained the obligation, and there was no US number to file with in the first place. IRS.gov states plainly that all returns submitted under the streamlined procedures must have a valid Taxpayer Identification Number, so the entire package waits on the Social Security number arriving. There is no partial or provisional submission that skips this requirement. What can be done in the meantime is every other piece of preparation, so the completed package can go out within days of the card arriving rather than months. It is also worth noting that streamlined eligibility is lost once the IRS opens a civil examination or criminal investigation, which is a further reason to start the SSN application as soon as the need becomes clear rather than waiting.

What does the streamlined catch-up package actually involve?

For the Streamlined Foreign Offshore procedure, IRS.gov sets out the components clearly. You file complete returns for the most recent three years for which the filing deadline has passed, together with delinquent Foreign Bank and Financial Accounts Reports (FBARs) for the most recent six years for which the FBAR deadline has passed, and you sign Form 14653 certifying, in narrative form, that the failures to file were non-willful. Eligibility for the foreign version of the procedure also requires that the applicant was physically outside the United States for at least 330 full days in one or more of the three tax years covered, a test an Accidental American who has never lived in the US satisfies without difficulty. On the tax side, the foreign earned income exclusion and the foreign tax credit generally do the most work: because the UK taxes employment and investment income at rates that are frequently at or above equivalent US rates, these mechanisms often reduce the US liability on already-taxed UK income to little or nothing, leaving a reporting obligation rather than a payment one.

Three years of federal income tax returns, for each of the most recent years whose filing deadline has passed.
Six years of FBARs (FinCEN Form 114), filed separately from the tax returns through the BSA E-Filing System, covering foreign accounts that exceeded the reporting threshold at any point in the year.
Form 14653, the signed non-willful certification narrative specific to your own facts.
Form 2555 for the foreign earned income exclusion and Form 1116 for the foreign tax credit, applied to reduce or eliminate the computed US tax.

Worked scenario: a London-based professional born in the US to British parents

Consider a partner at a London investment firm, born in Boston while her British parents completed a two-year secondment, brought home before her first birthday, and never resident in the United States since. She holds a British passport, has never held an American one, and has no Social Security number. Her private bank writes asking her to confirm her US status because her onboarding file records a US place of birth. The work starts with citizenship rather than tax: hers is not in doubt, but she has no document proving it, so she orders a certified long-form birth certificate from the Massachusetts vital records office. A records search confirms no Social Security number was ever assigned to her, so she completes Form SS-5-FS, books the required in-person appointment with the Federal Benefits Unit at the US Embassy in London, and attends with her birth certificate and British passport as evidence of citizenship and identity.

While the application is processing, everything that does not need the number gets done in parallel: three years of returns are drafted, six years of FBAR data is assembled from her account records, and her Form 14653 non-willful narrative is written around the specific facts of an infant departure that nobody in the family later thought to mention. Because the foreign earned income exclusion and foreign tax credit absorb almost all of her computed US liability against UK tax already paid, the outcome is a compliant filing history rather than a large tax bill. When the Social Security card arrives, the number is entered into the drafted returns, the FBARs are transmitted, and the streamlined package is submitted as a single, complete filing rather than a rushed one.

The sequencing trap: FATCA bank deadlines versus SSN processing time

The single biggest risk we see is timing mismatch. A UK bank's FATCA letter typically gives a matter of weeks to confirm US status and supply a US taxpayer number, while an original Social Security number application from abroad, including the mandatory in-person interview for anyone aged twelve or over, routinely runs on a timeline measured in months once appointment availability is factored in. Treating those two clocks as if they run on the same schedule is where accidental non-compliance turns into something that looks less inadvertent than it actually is. The answer is not to rush a filing that cannot legally happen without the number, and it is certainly not to misrepresent your status to the bank to buy time. It is to prioritise correctly: start the SSN application immediately, respond to the bank honestly and promptly with evidence that the application is under way, and prepare every part of the streamlined package that does not depend on the number so it is ready the moment the card arrives.

Start the SSN application the same week a bank letter or filing need appears, since the embassy appointment and processing time is usually the longest step in the whole project.
Respond to the bank's FATCA request in writing before its deadline, confirming you are a US person and that a taxpayer number application is pending.
Never sign a form declaring you are not a US person in order to buy time; that misstatement can undermine a later non-willful certification.
Use the waiting period productively: gather account records for six years of FBARs and draft the three years of returns and the Form 14653 narrative.
Insert the number, file the FBARs and submit the streamlined package as soon as the card is issued, rather than waiting for a further reason to delay.

Is giving up US citizenship a shortcut?

Some Accidental Americans consider renouncing citizenship to end the reporting obligation permanently, and it is worth understanding at a high level why it is not a way to skip the steps above. Expatriation is a separate legal process from tax compliance, formalised on Form 8854, and it generally requires certifying five years of US tax compliance immediately beforehand. In other words, coming into compliance is not an alternative to renouncing; it is a precondition for it, because you cannot certify a compliant filing history you do not have. For that reason, an Accidental American considering renunciation follows exactly the same sequence described here first: prove citizenship, obtain the SSN, and complete the streamlined catch-up, before expatriation becomes a live option at all.

The frustration in this situation is that the blocking step is administrative rather than financial. A well-resourced professional with a clean UK tax history is held up by a card that was never issued, and no amount of urgency shortens an embassy appointment queue. What is controllable is preparation. Every part of the streamlined package that does not require the number can be completed in advance, so the moment the Social Security Administration issues it, the full catch-up filing goes out as one complete submission rather than a delayed and partial one. Once that first streamlined package is filed, the ongoing burden usually shrinks to a routine annual US return prepared alongside the UK return each year, drawing on the same records and following the same FEIE and foreign tax credit mechanics that kept the original catch-up manageable. Clients who reach that steady state generally describe the SSN and streamlined stage as the hard part, and everything after it as bookkeeping.