Can my spouse file missed US tax returns separately if I have always filed as married filing separately?

Yes. Each US person has their own filing obligation, and a spouse who has never filed can submit delinquent returns as married filing separately alongside the returns you have already filed. The late returns must agree with yours: jointly held income has to be divided so the two returns total 100 percent, and under IRS Publication 501 a spouse cannot take the standard deduction if the other spouse itemized.

Do both spouses have to qualify for the Streamlined Foreign Offshore Procedures?

Only if they file jointly. The IRS states that for joint return filers both spouses must meet the applicable non-residency requirement. A spouse filing delinquent separate returns qualifies or fails on their own facts, including their own non-willful conduct. The certification on Form 14653 is a personal statement signed under penalties of perjury, so one spouse's reasons cannot be borrowed by the other.

Does the UK 50/50 rule for jointly owned property decide how we split income on US returns?

No. HMRC normally taxes married couples and civil partners living together on an even split of income from jointly owned property unless a valid Form 17 declaration of unequal beneficial interests has been made. That is a UK income tax rule. US separate returns follow each spouse's actual ownership share, so where ownership is unequal and no Form 17 exists, the UK and US allocations differ.

Am I liable for my spouse's US tax if we file the late returns jointly?

Yes. IRS Publication 501 states that both spouses may be held responsible, jointly and individually, for the tax, interest and penalties on a joint return, even if one spouse earned all the income. Innocent spouse relief, requested on Form 8857, may help where a spouse did not know of errors that understated the tax, but it is difficult to rely on for omissions you knew about when signing.

Missed US Tax Returns: When Only One Spouse Is Behind

Q: Can we change from separate returns to a joint return after the deadline?

Generally yes, within limits. IRS Publication 501 states that a couple can change from separate returns to a joint return by filing Form 1040-X, generally at any time within three years from the due date of the separate return or returns. The reverse is not allowed: once a joint return is filed, the couple cannot choose separate returns for that year after the due date.

Q: If we only have joint UK bank accounts, do we both need to file an FBAR?

Each US spouse has a financial interest in the whole of a joint account and reports its full value. One spouse can file for both only where the other jointly owns all of their foreign financial accounts with the filing spouse and has signed FinCEN Form 114a. One account in a sole name removes the exception. The IRS confirms that income tax filing status does not affect it.

Missed US tax returns belonging to one spouse do not cancel the other spouse's years of compliance, but they cannot be repaired in isolation either. Where both spouses are US persons living in the UK and only one has filed, the late spouse normally files the outstanding returns as married filing separately or the couple moves to joint returns for the years still open, and whichever route is chosen has to agree line by line with what the compliant spouse has already told the IRS. The work is less about the late spouse's forms than about making two sets of filings describe the same household.

Missed US tax returns for one spouse: what exactly is out of order?

In practice, three separate things tend to be out of order at once, and it helps to keep them apart from the first meeting:

The late spouse's income tax returns, with every information return that should have travelled with them.
The late spouse's Reports of Foreign Bank and Financial Accounts, which are a FinCEN filing and not part of the tax return at all.
The compliant spouse's own filings, which may be wrong in ways nobody noticed because nothing was ever compared against them: joint income reported in full or not at all, deductions claimed inconsistently, or joint accounts missing from that spouse's FBARs.

Which filing status can the late returns use?

A married couple who are both US persons have two real choices for each year: married filing jointly or married filing separately. IRS Publication 501 at https://www.irs.gov/publications/p501 states that a couple can choose married filing jointly if they are considered married and both spouses agree to file a joint return, and that a married person can choose married filing separately. Head of household is occasionally raised, but the considered unmarried test in the same publication requires, among other things, that the spouse did not live in the home during the last six months of the year. A couple sharing a house in Surrey does not meet it.

Married filing separately is the status that slots most easily beside returns the compliant spouse has already filed on that basis, because nothing already filed has to change status. It carries a cost. Publication 501 lists the special rules that apply to a separate return, and the ones that bite for a high-net-worth household in the UK are these:

The tax rate is generally higher than on a joint return.
If one spouse itemizes deductions, the other cannot take the standard deduction.
The capital loss deduction limit is 1,500 US dollars on a separate return, against 3,000 US dollars on a joint return.
The exemption amount for the alternative minimum tax is half of that allowed on a joint return.

The second rule in that list matters far more than its size suggests. If the compliant spouse itemized on the returns already filed, the late spouse's separate returns for the same years cannot take the standard deduction. If the compliant spouse took the standard deduction, the late spouse who itemizes creates an inconsistency with a return the IRS already holds. The deduction method on the late returns is therefore decided by reading the compliant spouse's filed returns first, not by working out what suits the late spouse best.

Can we switch to a joint return now, and can we switch back later?

The two directions are not symmetrical, and this is the rule that should shape the whole plan. Publication 501 says that a filing status can be changed from a separate return to a joint return by filing an amended return on Form 1040-X, and that the change to a joint return can generally be made at any time within three years from the due date of the separate return or returns. In the other direction the publication is blunt: once a joint return is filed, the couple cannot choose to file separate returns for that year after the due date of the return, apart from a narrow exception that has no bearing on a living couple.

For a couple catching up late, every year in question is already past its due date. That means a joint return filed now for one of those years is a one-way decision. A separate return filed now leaves the door to a joint return open for as long as the three-year window for that year runs. Where there is any doubt about the figures, about the other spouse's history, or about whether both spouses want to share liability, the prudent sequence is to regularise on separate returns and consider amending to joint afterwards for the years that remain in time. Form 1040-X and its instructions are published at https://www.irs.gov/forms-pubs/about-form-1040x.

Do the compliant spouse's filed returns need amending?

Only if they are wrong, but they need checking in every case, because the late spouse's returns will now put a second version of the household's facts in front of the IRS. The test we apply is simple: when the late spouse's returns are placed next to the compliant spouse's for the same year, does every jointly held item add up to 100 percent, no more and no less? The failure modes we see most often are these.

The compliant spouse reported all of the interest, dividends and rent from jointly held assets. Filing the late spouse's share on top double-counts income; leaving it off the late return understates that spouse's income.
The compliant spouse reported none of the joint income, on the footing that it was the other spouse's money. That return is understated regardless of what the late spouse now does.
The compliant spouse claimed the whole of a deduction or a foreign tax credit that related to jointly paid UK tax or jointly owned property.

How do the streamlined procedures work when only one spouse certifies non-willfulness?

The Streamlined Foreign Offshore Procedures are the IRS route for US taxpayers living abroad whose failures were non-willful. The IRS sets out the terms at https://www.irs.gov/individuals/international-taxpayers/u-s-taxpayers-residing-outside-the-united-states. A taxpayer files delinquent or amended returns, with all required information returns, for each of the most recent three years, files any delinquent FBARs for each of the most recent six years for which the FBAR due date has passed, pays the tax and interest due and signs a certification on Form 14653. Non-willful conduct is defined there as conduct due to negligence, inadvertence or mistake, or conduct that is the result of a good faith misunderstanding of the requirements of the law. A taxpayer who complies with the foreign procedures is not subject to failure-to-file and failure-to-pay penalties, and no offshore penalty applies under the foreign procedures. Penalties previously assessed for those years are not abated.

Two features of those terms matter for a couple. First, the non-residency requirement: for citizens and green card holders it turns on being physically outside the United States for at least 330 full days in at least one of the relevant years, and the IRS states that for joint return filers both spouses must meet the applicable non-residency requirement. A spouse who spent long stretches in the United States in each of the three years can prevent a joint streamlined submission even though the other spouse qualifies comfortably. Second, the certification is a personal statement of facts signed under penalties of perjury. It describes why that person failed to file and report. Spouses with different histories have different reasons, and each has to be able to stand behind what is said in their name.

That produces three workable shapes, and choosing between them is the main planning decision:

The late spouse alone files three delinquent separate returns and six years of FBARs under the foreign procedures and signs their own Form 14653. The compliant spouse, whose returns and FBARs were correct, certifies nothing because there is nothing to correct. This is the cleanest outcome and the one to aim for where the facts allow it.
The late spouse files as above, and the compliant spouse's returns turn out to have understated income or omitted reporting. The compliant spouse then has their own non-compliance and their own decision to make about how it is corrected, on their own facts. One spouse's non-willfulness does not carry across to the other.
The couple submits joint returns for the three years, amending the compliant spouse's separate returns in the process. Both spouses must then meet the non-residency requirement, both sign the returns, and the certification has to deal honestly with two different stories.

Does each spouse need their own FBAR for joint accounts?

Yes, as the starting point. The IRS explains at https://www.irs.gov/businesses/small-businesses-self-employed/report-of-foreign-bank-and-financial-accounts-fbar that a US person must file an FBAR if they have a financial interest in, or signature or other authority over, at least one financial account outside the United States and the aggregate value of those accounts exceeded 10,000 US dollars at any time during the calendar year. Each joint owner has a financial interest in the whole account, so each US spouse reports the full value of a joint account, not half of it. Two spouses with one joint account and nothing else each have a reportable account.

There is a spousal exception, and it is narrower than couples assume. A spouse does not have to file a separate FBAR where they jointly own all of their foreign financial accounts with the filing spouse and have completed and signed FinCEN Form 114a authorising that spouse to file on their behalf. The IRS adds that income tax filing status, whether married filing jointly or married filing separately, has no effect on qualifying for the exception. The word that defeats most couples is all. A single account in the late spouse's sole name, such as a cash ISA, a legacy student account or a workplace share plan, takes that spouse outside the exception, and they then report every account, joint ones included, on their own FBAR.

What if the compliant spouse's own FBARs left out the joint accounts?

This is the gap we find most often and it is rarely discussed. The compliant spouse has filed FBARs for years, but only for accounts they thought of as theirs: the salary account, their own savings. The joint account the other spouse opened, the joint mortgage offset account, or the investment portfolio registered in both names but managed by the other spouse was left off. Because each joint owner has a financial interest in the whole account, those FBARs were incomplete in every year.

The repair depends on whether tax was affected. Where the income from the omitted accounts was correctly reported on the compliant spouse's returns and only the FBAR was short, corrected FBARs are filed through FinCEN's BSA E-Filing System at https://bsaefiling.fincen.gov with an explanation of the reason for the late or amended filing. The IRS states that filing late or not at all is a violation and that assertion of penalties depends on the facts and circumstances, and it tells late filers to file as soon as possible. Where the omitted accounts also produced income that never reached a return, the compliant spouse has understated tax as well, and the amended returns and FBARs belong together, usually in that spouse's own streamlined submission if their conduct was non-willful and they meet the non-residency requirement.

How is jointly held UK income allocated between the spouses?

On separate US returns each spouse reports their own income, and income from a jointly owned asset follows ownership of the asset. The United Kingdom does not operate a community property system of the kind found in some US states, so there is no rule that automatically attributes half of each spouse's earnings to the other. Salary belongs to the spouse who earned it. Interest, dividends, rent and gains from jointly owned assets are divided according to each spouse's beneficial share.

The UK side adds a wrinkle. For UK income tax, HMRC's guidance at https://www.gov.uk/government/publications/income-tax-declaration-of-beneficial-interests-in-joint-property-and-income-17 states that couples living together who are married or in a civil partnership are normally taxed on an even split of the income from jointly owned property. A couple who own in unequal shares and want to be taxed on their actual shares use Form 17, and must provide evidence that their beneficial interests are unequal, for example a declaration or deed. HMRC's internal guidance states that the Form 17 declaration must be given to HMRC within 60 days of the date of the declaration, that the limit is enforced strictly and that there is no power to extend it.

The 50/50 treatment is a UK income tax rule. It does not rewrite who owns the asset, and the US return follows ownership. Where a property is beneficially owned 80/20 and no Form 17 has been made, the UK taxes each spouse on half the rent while the US separate returns report 80 percent and 20 percent. The UK tax each spouse has paid then does not line up with the income each reports to the IRS, and the foreign tax credit on each separate return has to be worked through with that mismatch in view. On a joint US return the mismatch disappears, because all the income and all the UK tax sit on one return. That is a legitimate factor in the joint versus separate decision. Where ownership really is equal, which is the usual position for a jointly held bank account, the UK and US allocations agree and each spouse reports half.

What does joint and several liability mean, and where does innocent spouse relief fit?

Joint and several liability is the rule that each spouse who signs a joint return can be held responsible for the entire tax, interest and penalties on it. Publication 501 puts it that both spouses may be held responsible, jointly and individually, and that one spouse may be held responsible for all the tax due even if all the income was earned by the other. It adds that the responsibility can survive a later divorce, whatever a divorce decree says about who should pay.

Innocent spouse relief is the IRS mechanism that can relieve a spouse from paying additional tax where the other spouse understated the tax due on a joint return. In outline, as the IRS describes it at https://www.irs.gov/individuals/innocent-spouse-relief, it is aimed at a person who filed a joint return, whose tax was understated because of errors on the return, and who did not know about the errors. It is requested on Form 8857, and the IRS says the request should be made within two years of receiving an IRS notice of an audit or of taxes due because of the error. Related forms of relief, separation of liability relief and equitable relief, are considered as part of the same request. We describe it to clients as a remedy for a problem discovered afterwards, not as a planning tool. A spouse who signs a joint catch-up return after sitting through the meetings in which the other spouse's omissions were set out will find it hard to say later that they did not know.

Who has to sign what?

Separate delinquent returns: signed by the late spouse only.
Joint returns, original or amended: signed by both spouses.
Form 1040-X amending the compliant spouse's separate return: signed by that spouse, and by both where the amendment changes the status to joint.
Form 14653: an original signed statement is submitted, with copies attached to each tax return and information return in the submission. The IRS says copies should not be attached to FBARs. A missing or deficient statement means the returns are processed in the ordinary way without the streamlined terms.
FBARs: filed by each spouse in their own name, unless the spousal exception is met and a signed Form 114a is held on file by the couple.

A worked scenario: one spouse filed, one never has

The following is an illustration only. The people and figures are invented to show the mechanics and are stated in pounds to avoid any assumption about exchange rates.

Rachel and Daniel are both US citizens living in London. Rachel moved from New York in her thirties and has filed every year as married filing separately, taking the standard deduction. Daniel was born in the United States to British parents, left at the age of three and has never filed a return or an FBAR. They hold a joint savings account paying interest of 12,000 pounds a year, a let flat owned in equal shares producing net rent of 20,000 pounds a year, and a joint investment account. Daniel also has a cash savings account in his sole name. Rachel's returns reported her salary and all 12,000 pounds of the savings interest, but none of the rent, which she regarded as Daniel's project. Her FBARs listed her salary account and the joint savings account but not the joint investment account.

Daniel's position is straightforward on its own. He meets the non-residency requirement, his failure arose from not knowing the obligation existed, and he can file three delinquent returns and six years of FBARs under the Streamlined Foreign Offshore Procedures. Because he has a sole account, the spousal FBAR exception is not available and he reports every account, joint and sole, in his own name. Because Rachel took the standard deduction, his separate returns are prepared on the same footing.

Rachel's position is where the work is. On the correct allocation each spouse reports 6,000 pounds of interest and 10,000 pounds of rent. Rachel therefore over-reported interest by 6,000 pounds and under-reported rent by 10,000 pounds in each year, a net understatement, and her FBARs omitted an account in which she had a financial interest. If Daniel's returns simply reported his half of everything, the interest would be counted one and a half times across the household and Rachel's rent would still be missing. Rachel needs amended returns for the three years and corrected FBARs, and she has to consider her own reasons for the omissions on her own facts.

The couple then compare two complete sets of figures: separate returns for both, or joint returns for the three years. On these facts both would be regularised either way. They choose separate returns, because Daniel's earlier investment records are incomplete and Rachel does not want to assume liability for figures she cannot verify on returns that could never be separated again. They diarise the three-year window for each year so that amending to joint remains available once the records are complete.

In what order should the couple file so nothing contradicts?

Obtain every return and FBAR the compliant spouse has filed for the six-year FBAR period, together with IRS account transcripts where the copies are incomplete.
Build one household schedule of every account and asset for each year, showing legal and beneficial ownership, and mark each as joint or sole.
Reconcile that schedule to both spouses' UK self assessment returns and to any Form 17 held by HMRC.
Test the compliant spouse's filed returns and FBARs against the schedule and list every difference.
Decide the filing status year by year, remembering that a joint return cannot be reversed and a separate return can be amended to joint within the time limit.
Settle each spouse's route separately: streamlined for a spouse with non-willful failures, ordinary amended returns or corrected FBARs for the other where that is all that is needed.
Prepare both spouses' filings in parallel from the one schedule so that every joint item totals 100 percent and the deduction method agrees.
File together, or with the compliant spouse's corrections going in no later than the late spouse's returns, so that the IRS never holds two conflicting accounts of the same asset.

What about a spouse who is not a US person?

Everything above assumes both spouses are US persons; where one spouse is neither a citizen nor a green card holder, the election to treat that spouse as a US resident for a joint return raises different questions and is covered in its own article on this site.