How many days do I have to respond to a CP3219A if I live in the UK?

IRS.gov sets the petition period at 90 days from the date on the notice, extended to 150 days where the statutory notice of deficiency is addressed to a person outside the United States. Almost every US person resident in Britain falls within the 150-day period. The Internal Revenue Manual confirms the period is fixed by law, that the IRS cannot extend it, and that it is not extended or suspended even when the Independent Office of Appeals takes jurisdiction of the case.

Does the 150 days run from when I received the notice or from the notice date?

From the notice date. The clock starts on the date printed on the notice, not the day it was delivered to your UK address, so international postal delay silently consumes part of your window. The Code also allows the IRS to mail the notice to your last known address by certified or registered mail, and a notice properly mailed that way is valid whether or not it reached you. Keeping your address current with the IRS on Form 8822 is the practical protection.

What is the difference between a CP3219A and a CP3219N?

Both are statutory notices of deficiency and both carry the same 90-day and 150-day windows. IRS.gov issues CP3219A where a return was filed and an underreporter case or examination closed without agreement, and CP3219N where no return was filed and the IRS computed the tax itself from third-party income data. If you hold a CP3219N, the figure rests on a substitute computation that the IRS itself says may not give credit for deductions and exemptions you are entitled to receive.

Can I still claim the foreign earned income exclusion this late?

Not automatically. IRS.gov allows the exclusion to be chosen on a timely filed return including extensions, on an amendment to a timely filed return, or on a late return filed within one year of the original due date. After that it is permitted only where no federal income tax is owed after the exclusion, or, where tax is owed, only where you file before the IRS discovers the failure to elect. If tax is owed and the IRS has already discovered it, a private letter ruling is required. This is why the foreign tax credit is usually the primary relief in a deficiency response.

Can I still use the Streamlined Foreign Offshore Procedures after a notice of deficiency?

Often not. The IRS.gov page on the streamlined filing compliance procedures states that a taxpayer is ineligible where the IRS has initiated a civil examination of the taxpayer's returns for any taxable year, and ineligible where IRS Criminal Investigation is involved. Because a deficiency notice normally follows an examination or underreporter case, the streamlined route may already be closed for those years. Establish exactly what IRS activity exists on your account before choosing a submission route.

What happens if I miss the 90 or 150 day deadline?

The United States Tax Court cannot consider the case and the IRS assesses the proposed tax with applicable penalties and interest, after which notice and demand for payment and the collection process follow. Filing your actual returns for those years is still worthwhile, and the IRS operates an administrative reconsideration process for assessed liabilities where new information is supplied, stating that it will generally adjust the account to reflect the correct figures. Those routes are slower and start from a weaker position than a timely petition.

Missed US Tax Returns CP3219A: Notice of Deficiency

Missed US Tax Returns CP3219A is the search that follows an IRS envelope landing on a London doormat, and the answer is narrow and urgent. A CP3219A is the statutory notice of deficiency: the last document the Internal Revenue Service issues before it can lawfully assess the tax it says you owe. It carries a fixed window in which to petition the United States Tax Court, and IRS.gov states that window as 90 days from the date printed on the notice, or 150 days where the notice is addressed to a person outside the United States. Nothing you post to the IRS, and no telephone call with any officer, extends that date.

For a US citizen or green card holder in Britain who simply never filed, the notice misleads in a particular and expensive way. The number on the front page is not a computed liability in any meaningful sense. It is what the tax would be if you were a single US resident with no foreign earned income exclusion, no foreign tax credit for the UK income tax already paid to HM Revenue and Customs, no treaty position, no cost basis on your investment sales, and no deductions beyond the most basic. Treat it as an opening position built from third-party data, because that is what it is.

Two things therefore have to happen in parallel. The petition date must be protected as a matter of calendar discipline, and the actual returns must be prepared properly so the correct liability replaces the constructed one.

What Is a CP3219A Notice of Deficiency?

A CP3219A is a statutory notice of deficiency, known in practice as the 90-day letter. IRS.gov describes it as a notice of a proposed change to your tax. Its legal function is specific: it is the document the Code requires the IRS to issue before it may assess an income tax deficiency, and the document that opens your right to take the dispute to the United States Tax Court without paying first. Every other letter in the sequence is administrative correspondence. This one is jurisdictional.

The notice arrives with a waiver enclosed. Form 5564, Notice of Deficiency Waiver, is what you sign and return if you agree with the proposed change and want the tax assessed so you can move to payment. Signing it ends the matter and closes the Tax Court door. For a US person in the UK with missed returns it is almost never the right first move, because the proposed figure was built without any of the reliefs that apply to you.

How Does the CP3219A Differ From the Notices That Came Before It?

The deficiency notice sits at the end of a chain. Knowing where you are in it tells you how much of your position is already foreclosed and how much remains open.

Automated matching notices come first where a return was filed. The Automated Underreporter programme compares it against Forms W-2, 1099, 1042-S and similar third-party reports and proposes a change. These are administrative and resolvable by correspondence.
Non-filer notices come first where no return exists. The IRS asks for the missing return and warns it will compute the tax itself if nothing arrives.
An examination report follows where a return was examined and the examiner reached a conclusion you did not sign.
The statutory notice of deficiency, CP3219A or CP3219N, is issued when the earlier stage closed without agreement. It is not a request. It is the formal predicate to assessment.
Assessment, notice and demand for payment, and collection follow if the period expires without a petition.

By the time a CP3219A is in your hand, the informal windows have gone, usually without your knowledge because the earlier letters went to a US address you left years ago. What remains is a hard statutory right with a hard clock attached.

CP3219A or CP3219N: Which Notice Does a Non-Filer Actually Receive?

Check this on your own paperwork, because it changes what the enclosed computation contains and most published guidance ignores it. IRS.gov maintains separate pages for the two notices. CP3219A follows an underreporter case or a closed examination. CP3219N is issued where the IRS received no return and calculated the tax itself from income reported by employers, banks and brokers. Both are notices of deficiency carrying the same 90-day and 150-day windows.

The difference matters because CP3219N rests on a substitute for return, prepared from raw income data with no expenditure, no basis and no election. On its guidance for filing past due tax returns, the IRS says plainly that such a return might not give you credit for deductions and exemptions you may be entitled to receive, that it remains in your best interest to file your own return, and that it will generally adjust your account to reflect the correct figures. That is the IRS telling non-filers, in its own words, that the number in the notice is not the number you owe. A CP3219A is usually built on a return you did file, so the argument is about specific omitted items rather than the whole computation.

How Long Do You Have to Respond, and Does the UK Address Change It?

The response window is set by statute and the IRS cannot lengthen it. The Internal Revenue Manual section on statutory notice of deficiency cases confirms the periods.

90 days from the date shown on the notice to petition the United States Tax Court, where it is addressed within the United States.
150 days where the notice is mailed to an address outside the United States or the taxpayer is out of the country. This applies to almost every US person resident in Britain.
The period runs from the notice date, not from the date the envelope reached you.
The Taxpayer Advocate Service states that a petition must be filed by 11:59pm Eastern Time on the last day, and that where that day falls on a weekend or District of Columbia holiday, the next business day counts.
The Internal Revenue Manual is explicit that the period is not extended or suspended when the IRS Independent Office of Appeals accepts jurisdiction. Appeals does not buy time.
If the deadline is missed, the Tax Court cannot consider the case and the proposed tax is assessed with applicable penalties and interest.

The most common error we see is a client who assumes 150 days is generous and spends the first hundred gathering UK payroll records. Preparing five years of returns, reconstructing UK investment basis and obtaining HMRC records is not a four-week exercise. Diarise the date the day the notice is opened.

Why the IRS Figure Almost Always Overstates What a US Person in the UK Owes

A substitute computation is not a hostile act. It is arithmetic performed on incomplete data by a system with no way of knowing you live in Britain, pay UK tax, are married, or bought your shares at a price. The constructed figure is inflated in several structural ways at once.

Filing status. The computation typically applies the least favourable status available, so a married taxpayer loses the benefit of the status they would actually claim.
Foreign earned income exclusion. Form 2555 is an election, and an election you did not make is one the IRS will not make for you. The exclusion and the foreign housing exclusion are simply absent.
Foreign tax credit. UK income tax already paid to HMRC on the same income appears nowhere in a substitute computation, even though it is frequently the largest offset available and, at higher UK effective rates, often eliminates the US liability on that income.
Treaty positions. Relief under the United States and United Kingdom income tax treaty requires a filed return and, where applicable, a disclosure. None of it applies automatically.
Cost basis. Brokers report gross proceeds on Form 1099-B. Where basis is not reported, the computation can treat entire share sale proceeds as gain, which is why a portfolio rebalance can generate a phantom six-figure deficiency.
Deductions and credits. Itemised deductions, business expenses on Schedule C, dependants and credits you are entitled to are all outside the data the IRS holds.

Missed US Tax Returns CP3219A: What Filing the Actual Return Achieves Now

Filing the genuine return does three jobs. It substitutes a computed liability for a constructed one, and where the IRS prepared a substitute for return its own guidance says it will generally adjust your account to reflect the correct figures. It makes the elections and claims the substitute omitted, which is where the entire economic benefit sits for a UK resident. And it establishes a filed return for the year.

What filing does not do is stop the clock, and this is the point that catches people. Sending the IRS a complete Form 1040 with Forms 1116 and 2555 attached, a covering explanation and a Form 2848 power of attorney for your preparer is exactly the right substantive action. It is also entirely separate from the petition deadline. If the IRS has not processed your returns before the 90 or 150 days expire and you have not petitioned, the deficiency is assessed regardless of the quality of the package sitting in a service centre queue.

Treat the two workstreams as independent. Submit the returns on the fastest realistic timetable, and separately decide, well before the petition date, whether a petition is needed as protection. Where the deficiency is material and the returns will not clearly be resolved in time, petitioning preserves the position without preventing a later administrative settlement. A notice of deficiency can also be rescinded by mutual agreement using Form 8626, Agreement to Rescind Notice of Deficiency, though this requires IRS consent and cannot be assumed.

The Form 2555 Election Timing Trap That No General Guide Mentions

Here is the cross-border point that domestic notice-of-deficiency guides never reach, and it can change the entire response strategy. The foreign earned income exclusion is not a deduction you claim whenever you get round to filing. It is an election, and IRS.gov sets out precise rules for when it may be made: on a timely filed return including extensions, on a return amending a timely filed return, or on a late-filed return filed within one year from the original due date, without regard to extensions.

Beyond those periods, IRS.gov permits the election in only two situations. Either you owe no federal income tax after taking the exclusion into account, or, if you do owe federal income tax after taking it into account, you file before the IRS discovers that you failed to choose the exclusion. If tax is owed and the IRS has already discovered the failure to elect, the published position is that you must request a private letter ruling under the regulations governing extensions of time to make elections.

Read that against a notice of deficiency and the difficulty is obvious. A statutory notice computing tax on your foreign earnings with no exclusion applied is about as clear an expression of IRS discovery as exists. For older missed years where a residual liability remains after all reliefs, the exclusion route may be materially harder to sustain than the taxpayer assumes, and a ruling request is neither quick nor cheap. The foreign tax credit carries no equivalent election-timing rule, which is why the credit, supported by proper evidence of UK tax paid, usually does the heavy lifting in a deficiency response. For higher earners in London it was going to dominate in any event, because earnings comfortably exceed the annual exclusion limit and UK effective rates on employment income sit above the equivalent US rates. Knowing which relief you are actually relying on, before you post the package, is the difference between a clean resolution and a stalled file.

Does an Open Deficiency Case Block the Streamlined Foreign Offshore Procedures?

Very often, yes, and this is the second point general guidance misses. Many US persons in Britain think of the Streamlined Foreign Offshore Procedures as the route back. The IRS.gov page on the streamlined filing compliance procedures states that where the IRS has initiated a civil examination of a taxpayer's returns for any taxable year, the taxpayer is not eligible to use the procedures, and that a taxpayer under investigation by IRS Criminal Investigation is likewise ineligible. The procedures also require certification that the failures were non-willful, and a valid Taxpayer Identification Number for every return.

The sequencing consequence has to be faced directly. Someone who has been through an examination or underreporter case and now holds a deficiency notice cannot assume the streamlined route remains open, and a package later held ineligible wastes time you do not have. Establish precisely what IRS activity exists on your account, and for which years, before choosing a route. Where streamlined is unavailable, the years still have to be filed and the deficiency still answered on its merits.

A Worked Example: Four Missed Years for a London Investment Banker

The figures below are illustrative. Daniel is a US citizen who has lived and worked in London for eleven years and has never filed a US return. His UK employment income across the four years rose from about £280,000 to about £395,000, all taxed in the UK through PAYE. He also holds a legacy US brokerage account which, in one of those years, reported gross proceeds of roughly $760,000 on Form 1099-B after a portfolio rebalance, plus around $19,000 of dividends. The IRS proposed a very large aggregate deficiency.

It taxed the full UK salary as US income with no exclusion and no credit for the UK tax already paid on it.
It applied a single filing status, although Daniel is married.
It treated the entire $760,000 of brokerage proceeds as gain because no cost basis had been reported for the older lots, when the actual economic gain was a small fraction of that.
It applied no treaty position and no itemised deductions.
It added failure to file and accuracy-related penalties on that inflated base, plus interest.

Properly prepared, the picture changes completely. Reconstructing the broker basis from purchase confirmations reduced the reported gain to a modest figure. Foreign tax credits on Forms 1116, supported by HMRC records and P60s evidencing UK tax paid, absorbed effectively all of the US tax on the employment income, because UK effective rates on it exceeded the US rates applied. The correct filing status was applied. The residual liability across all four years fell to a small figure driven mainly by passive income UK tax did not fully shelter, and because penalties are computed by reference to the tax actually due, the penalty exposure contracted with it.

Why Postal Delay to a UK Address Does Not Buy You Extra Time

This risk is unique to overseas recipients. The 150-day period runs from the date printed on the notice. It does not run from delivery in Britain, and it is not paused because the notice sat in an international mail centre, was forwarded from an old US address, or arrived while you were away. Open the envelope six weeks after the notice date and you have already spent six weeks of the 150.

Worse, the Code authorises the IRS to mail a statutory notice of deficiency to the taxpayer's last known address by certified or registered mail, and the Internal Revenue Manual reflects that authority. Where the notice is properly mailed there, its validity does not depend on you receiving it. For a US person who moved to Britain years ago, the last known address is frequently a former US home or a relative's house, because it is the address on the most recently processed return. Deficiency notices are lost this way constantly.

Two conclusions follow. File a change of address on Form 8822 and keep it current, so the address the IRS is obliged to use is one where post reaches you. And if a notice arrives late, the first task is not to draft a response but to calculate the days remaining from the notice date. Where little time remains, protecting the petition date takes priority over perfecting the returns.

What Evidence and Records Do You Need to Assemble?

A deficiency response for missed years is an evidence exercise. The claims that reduce the number all require documentation, and UK-sourced records take longest to obtain, so start there on day one.

IRS wage and income transcripts and account transcripts for every year, showing exactly what third-party data the computation was built from.
UK employment records: P60s for each tax year, P45s for job changes, P11D benefit statements and employer payroll summaries.
Evidence of UK income tax actually paid, including HMRC self assessment calculations and statements of account, to support the foreign tax credit claim.
Full UK and US bank and brokerage statements, including purchase confirmations and corporate action notices needed to reconstruct cost basis.
Records establishing physical presence or residence abroad where an exclusion position is available, including travel history.
Details of UK company shareholdings or partnership interests, since missed returns commonly come with missed information returns to handle in the same exercise.
The notice itself with every enclosure, and any earlier IRS correspondence you can locate.

Note the timing point that catches people out. UK tax years and US tax years do not align, and UK tax paid has to be translated and allocated to the correct US year on a consistent basis. Done carelessly, this produces credit claims the IRS will query, which is precisely what you cannot afford while a deficiency is live.

What Happens If the 90 or 150 Day Deadline Passes?

If the period expires without a petition, the Tax Court cannot take the case and the IRS assesses the proposed deficiency with applicable penalties and interest. Assessment converts a proposal into a debt. Notice and demand for payment follows, and the collection machinery becomes available. You have lost the one forum in which the liability could have been contested without paying first.

You have not lost every route. Filing the actual returns remains worthwhile, and the IRS operates an administrative reconsideration process in which an assessed liability is re-examined in the light of information not previously considered. Where a substitute for return was the basis of the assessment, a complete correct return with full supporting evidence is the natural vehicle, and the IRS states it will generally adjust the account to reflect the correct figures. A liability may also be contested in the refund forums after payment, a materially worse commercial position but not a closed door.

How the Work Should Be Sequenced

In a live deficiency file, the order of operations is consistent.

Read the notice date, confirm whether the 90 or 150 day period applies, calculate the last day and diarise it before anything else happens.
Confirm which notice you hold, CP3219A or CP3219N, and which years and adjustments it covers.
Put a Form 2848 power of attorney in place and pull the IRS transcripts to see the underlying data and any other activity on the account.
Establish whether any offshore compliance route remains open before committing to a submission strategy.
Commission the UK evidence gathering immediately, since HMRC and employer records are the long-lead items.
Prepare the real returns with the foreign tax credit, any sustainable exclusion position, correct filing status and reconstructed basis, and file with a clear covering explanation.
Decide, with time in hand rather than in the final fortnight, whether a Tax Court petition is required to protect the position.

A CP3219A on missed US tax returns is a serious document with a hard edge, but for most US persons living in the UK it is also a badly overstated one. The response is not persuasion. It is preparation: correct returns, properly evidenced foreign tax credits, and a deadline respected from the day the envelope is opened.