Introduction You moved to London five years ago with your American spouse, had two children in the UK, and have been filing a US Form 1040 every year through Form 1116, the Foreign Tax Credit, to absorb all US tax on your UK salary. Then a colleague at the school gate mentions she received approximately […]
You moved to London five years ago with your American spouse, had two children in the UK, and have been filing a US Form 1040 every year through Form 1116, the Foreign Tax Credit, to absorb all US tax on your UK salary. Then a colleague at the school gate mentions she received approximately $3,400 of refundable US Child Tax Credit on her 2024 Form 1040, and you realize you may have been leaving money on the table for years. The child tax credit US citizens UK rules are surprisingly generous to American parents abroad, but the technical conditions — qualifying child SSN, residency tests, refundable portion limits — trip up many UK-resident American families unless properly handled.
This guide is written for American parents living in England, Scotland, Wales, or Northern Ireland with UK-born or UK-raised children; US citizens raising children in the UK on long-term assignment; and dual US-UK citizen families navigating the cross-border child tax credit. By the end, you will know exactly how the US Child Tax Credit works for UK-resident families, what documentation is required, and how to maximise the refundable Additional Child Tax Credit portion. For our broader cross-border service overview, see our US-UK cross-border tax advisory service.
The US Child Tax Credit (CTC) under IRC Section 24 provides a federal income tax credit of up to $2,000 per qualifying child under age 17 to US-citizen and Green Card holder taxpayers, including those living abroad. The credit is claimed annually on Form 1040 Schedule 8812 (Credits for Qualifying Children and Other Dependents). The official IRS Child Tax Credit page is at https://www.irs.gov/credits-deductions/individuals/child-tax-credit.
For 2025 and 2026, the credit operates in two parts. The non-refundable portion of up to $2,000 per child reduces US federal tax liability to zero but does not generate a refund. The Additional Child Tax Credit (ACTC) refundable portion of up to $1,700 per child in 2025-26 (inflation-adjusted from the base $1,400) is paid as a cash refund where the non-refundable portion exceeds the taxpayer’s US federal tax liability, which is the typical position for UK-resident American parents with Foreign Tax Credit absorbing all US tax on UK income.
The child tax credit for US citizens and UK residents is particularly valuable in 2026 because the refundable Additional Child Tax Credit portion provides cash refunds to UK-resident American parents who would otherwise have no US tax due. A UK-resident American family with two qualifying children can receive up to $3,400 of refundable ACTC annually, paid by US Treasury cheque or direct deposit to a US bank account, even when Form 1116 FTC reduces US tax on their UK salary to zero.
Three reasons make the child tax credit for US citizens and the UK position particularly important in the 2025-26 tax year. First, the Tax Cuts and Jobs Act of 2017 doubled the Child Tax Credit to $2,000 per child and made $1,400 of it refundable (now $1,700 inflation-adjusted for 2025-26), with these provisions set to expire on 31 December 2025 unless Congress extends them. The IRS guidance on the post-2025 position sits at https://www.irs.gov/credits-deductions/individuals/child-tax-credit. UK-resident American parents should be aware of the legislative landscape and lock in current-year claims while the enhanced refundable portion remains available.
Second, US Treasury data shows that approximately 9 million US-citizen children abroad are eligible for the Child Tax Credit. Still, a substantial portion of qualifying families do not claim it, primarily because UK-resident American parents either do not file Form 1040 at all or file without specialist support and miss the Schedule 8812 entry. Our Streamlined Filing guide for UK Americans covers the catch-up route for families who have missed multiple years of Child Tax Credit claims.
Third, post-Brexit administrative pressure on US-person banking in the UK has tightened FATCA documentation requirements, and US-citizen children of UK-resident American parents face the same FATCA scrutiny as their parents on any UK financial accounts held in the child’s name. The Child Tax Credit position, therefore, intersects with the broader cross-border compliance work covering FBAR, Form 8938, and FATCA disclosure for UK Junior ISAs and child savings accounts.
The eligibility requirements for U.S. citizens for the child tax credit require the child to meet five tests under IRC Sections 152 and 24. The relationship test requires the child to be the taxpayer’s son, daughter, stepchild, eligible foster child, brother, sister, half-sibling, step-sibling, or a descendant of any of these (grandchild, niece, nephew). The age test requires the child to be under age 17 at the end of the tax year (16 years and 11 months on 31 December counts; 17 years on 31 December does not). The support test requires the child not to have provided more than half of their own support during the year. The dependency test requires the child to be claimed as a dependent on the taxpayer’s Form 1040. The citizenship test requires the child to be a US citizen, US national, or US resident alien.
For UK-resident American families, the citizenship test is the most commonly tripped condition. UK-born children of US-citizen parents automatically acquire US citizenship at birth under the Immigration and Nationality Act Section 301 transmission rules, provided the US-citizen parent meets the physical presence requirements (generally five years of physical presence in the USe, including two years after age 14). However, the child needs a US Consular Report of Birth Abroad (CRBA) issued through the US Embassy in London and a US passport to evidence US citizenship for IRS purposes. UK-born children registered for UK citizenship but not yet documented as US citizens face the citizenship test failure until the CRBA is issued.
The single most important technical requirement is the qualifying child’s US Social Security Number (SSN) requirement under IRC Section 24(h)(7). The child must hold a valid SSN issued by the Social Security Administration before the Form 1040 due date (including extensions) for the credit year. Children with an ITIN (Individual Taxpayer Identification Number) issued via Form W-7 do not qualify for the Child Tax Credit — ITIN-only children qualify only for the smaller $500 Credit for Other Dependents under IRC Section 24(h)(4).
UK-born children of US citizen parents apply for an SSN via Form SS-5 (Application for a Social Security Card) through the Federal Benefits Unit at the US Embassy in London. The SSN application requires the child’s CRBA, US passport, parents’ identification, and an in-person interview at the US Embassy. The Federal Benefits Unit guidance sits at https://uk.usembassy.gov/u-s-citizen-services/social-security/. SSN issuance typically takes 4 to 8 weeks after the Embassy interview, though processing times have extended to 3 to 6 months in some periods. UK-resident American parents planning to claim the Child Tax Credit for a UK-born child should initiate the SSN application as early as possible.
The child tax credit for US citizens and UK credit phases out by $50 for every $1,000 of Modified Adjusted Gross Income (MAGI) above $200,000 (single, head of household, or married filing separately) or $400,000 (married filing jointly). MAGI for this purpose adds back the Foreign Earned Income Exclusion (Form 2555) and the Foreign Housing Exclusion to AGI, so UK-resident American parents claiming FEIE need to compute MAGI carefully. For most UK-resident American families with a combined income below the relevant threshold, the full $2,000 per-child credit applies before the phase-out.
The first step is reviewing qualifying child documentation. Each child claimed needs a US Consular Report of Birth Abroad (CRBA), a US passport, and a US Social Security Number issued via Form SS-5 application through the Federal Benefits Unit at the US Embassy in London. Children without CRBA and SSN cannot be claimed for the Child Tax Credit, even if they otherwise meet the qualifying-child tests. The IRS guidance on qualifying child documentation is available at https://www.irs.gov/credits-deductions/individuals/child-tax-credit.
The second step is the income testing. Modified Adjusted Gross Income is computed by adding back any Form 2555 Foreign Earned Income Exclusion and Foreign Housing Exclusion claimed on the Form 1040 to the AGI. If MAGI is below $200,000 (single) or $400,000 (married filing jointly), the full $2,000 per qualifying child credit is available before phase-out.
The third step is preparing Schedule 8812. Schedule 8812 (Credits for Qualifying Children and Other Dependents) is attached to Form 1040 and computes both the non-refundable Child Tax Credit and the refundable Additional Child Tax Credit. The form requires each qualifying child’s name, SSN, relationship to the taxpayer, and confirmation of US citizenship.
The fourth step is the Foreign Tax Credit coordination. For UK-resident American parents claiming Form 1116 Foreign Tax Credit on UK salary, the credit ordering rules apply — the non-refundable Child Tax Credit reduces US federal tax liability before Form 1116 FTC is applied. Where the non-refundable Child Tax Credit reduces US tax to zero, the refundable Additional Child Tax Credit portion (up to $1,700 per child in 2025-26) is calculated based on earned income above $2,500 multiplied by 15 percent up to the $1,700 per child cap.
The fifth step is the earned income calculation for the ACTC. Earned income for ACTC purposes includes UK salary, UK self-employment income, and UK partnership distributive share — but excludes income excluded under Form 2555 FEIE. UK-resident American parents claiming Form 2555 FEIE on their full UK salary therefore, have $0 earned income for ACTC purposes and cannot claim the refundable portion. This is the single most common reason UK-resident American families miss out on the refundable ACTC — switching from Form 2555 FEIE to Form 1116 FTC unlocks the full refundable position.
The sixth step is the Form 1040 filing and refund processing. The Form 1040 with Schedule 8812 is filed by the automatic expat extension deadline of 15 June (or 15 October if Form 4868 has been filed by 15 June). Refundable Additional Child Tax Credit refunds are paid by US Treasury cheque to a US mailing address or by direct deposit to a US bank account. Refund processing typically takes 6 to 12 weeks from the date Form 1040 is accepted.
The seventh step is the integration of the going-forward strategy. UK-resident American parents claiming the Child Tax Credit should review their Form 1116 FTC versus Form 2555 FEIE positioning annually — FTC positioning unlocks the refundable ACTC, FEIE positioning forfeits it. The IRS publication on US citizens abroad sits at https://www.irs.gov/publications/p54.
Daniel and Rachel are both US citizens, aged 38 and 36, working as a finance director and a marketing consultant, respectively, in London, with a combined annual income of approximately £215,000. They moved from New York to London in 2019, married in 2020, and had two children — Amelia (born July 2021 in London) and James (born October 2023). Daniel had been filing US Form 1040 jointly each year through a generalist Boston-based CPA, using Form 2555 Foreign Earned Income Exclusion on his full UK salary because the Boston CPA defaulted to FEIE positioning for all expat clients. Rachel had been included on the joint return, but no Child Tax Credit had been claimed for either child across the 2021, 2022, 2023, or 2024 tax years.
The Boston CPA had not raised the Child Tax Credit at any point. Amelia and James had US Consular Reports of Birth Abroad and US passports obtained through the US Embassy in London shortly after each birth. Still, neither had applied for a US Social Security Number — the Boston CPA had advised that an SSN was not needed for children of US citizens abroad until they reached working age.
In early 2026 Rachel’s American friend at the playgroup mentioned receiving approximately $3,400 of refundable Child Tax Credit on her 2024 Form 1040. Rachel and Daniel engaged Jungle Tax in February 2026 after researching the position. The cross-border review identified five immediate exposure points.
First, both Amelia and James were qualifying children under IRC Sections 152 and 24 for all relevant years — US citizens by birth, under 17, claimed as dependents, and supported by their parents. The only barrier was the absence of a US Social Security Number for each child.
Second, the absence of an SSN had prevented Child Tax Credit claims for 2021 onwards. The IRC Section 24(h)(7) SSN requirement is hard — children with an ITIN or no US tax identification number cannot be claimed for the Child Tax Credit.
Third, Daniel’s Form 2555 FEIE positioning had forfeited the refundable Additional Child Tax Credit portion across the four years, even if the SSN had been in place — earned income for ACTC purposes excludes Form 2555 excluded income, and Daniel’s entire UK salary had been excluded each year.
Fourth, the joint Form 1040 returns for 2022, 2023, and 2024 were still within the three-year amendment window under IRC Section 6511 — amended returns could capture missed Child Tax Credit retroactively once the children had SSNs.
Fifth, Form 1116 FTC repositioning was materially better for the family’s long-term US tax position regardless of the Child Tax Credit recovery. The Boston CPA’s default FEIE positioning had been suboptimal for several reasons beyond the Child Tax Credit forfeiture — including FTC carryforward under IRC Section 904(c), Roth IRA contribution preservation under IRC Section 219, and the ongoing ability to claim the refundable ACTC.
The remediation route ran in parallel workstreams. The SSN application workstream applied for both children’s US Social Security Numbers via Form SS-5 through the Federal Benefits Unit at the US Embassy in London in February 2026. Amelia’s SSN was issued in late April 2026; James’s SSN was issued in mid-May 2026. The amended return workstream prepared Form 1040X for the 2022, 2023, and 2024 tax years, switching the entire family from Form 2555 FEIE to Form 1116 Foreign Tax Credit (absorbing all US tax on Daniel and Rachel’s UK income through general category UK tax paid) and adding Schedule 8812 claiming the Child Tax Credit and refundable Additional Child Tax Credit for both children for each amended year.
Note on the timing: Amelia was a qualifying child for 2022, 2023, and 2024 (she had been born in July 2021); James was a qualifying child only for 2023 and 2024 (he had been born in October 2023). The amended returns were filed in late May 2026 after both SSNs were in place.
The 2025 Form 1040 was then prepared on the new Form 1116 FTC basis with Schedule 8812 claiming the Child Tax Credit and refundable Additional Child Tax Credit for both children, and filed by the 15 June 2026 automatic expat extension deadline.
The outcome was Child Tax Credit recovery of approximately $13,600 across the four years — approximately $1,700 refundable ACTC for Amelia in 2022, approximately $1,700 for Amelia in 2023, plus approximately $1,700 for James in 2023, approximately $1,700 for Amelia in 2024, plus approximately $1,700 for James in 2024, and approximately $1,700 for each child in 2025. The refundable ACTC was paid by the US Treasury, via direct deposit, to Daniel and Rachel’s retained Chase US bank account from June through October 2026 as each amended return was processed.
Beyond the Child Tax Credit recovery, the Form 1116 FTC repositioning generated approximately $24,000 of accumulated general category FTC carryforward under IRC Section 904(c) available for the next ten years against future US-source income events, restored Roth IRA contribution eligibility for both Daniel and Rachel under IRC Section 219, and established a clean ongoing baseline. Total Jungle Tax fee approximately £4,200 for the integrated amendment plus SSN coordination plus first-year ongoing engagement, against recovered Child Tax Credit of approximately $13,600 plus forward FTC carryforward of approximately $24,000.
The first mistake is claiming Form 2555 Foreign Earned Income Exclusion and assuming the Child Tax Credit still works. Form 2555 FEIE excludes the underlying earned income from US tax — but it also excludes that same income from the earned income definition for refundable Additional Child Tax Credit purposes under IRC Section 24(d)(1)(B)(ii). UK-resident American parents claiming FEIE on their full UK salary,lary therefore, have $0 earned income for ACTC purposes and forfeit the entire refundable portion. Form 1116 Foreign Tax Credit positioning preserves both the FTC relief and the ACTC eligibility.
The second mistake is filing for the Child Tax Credit before the child has a US Social Security Number. The IRC Section 24(h)(7) SSN requirement is strict — children must hold a valid SSN issued before the Form 1040 due date (including extensions). Children with ITIN obtained through Form W-7 do not qualify for the Child Tax Credit and instead qualify only for the smaller $500 non-refundable Credit for Other Dependents.
The third mistake is missing the three-year amendment window for prior-year Child Tax Credit claims. Form 1040X amendments are available within three years from the original filing date or two years from the date of payment, whichever is later, under IRC Section 6511. UK-resident American parents who missed Child Tax Credit claims for prior years can typically recover the last three years through Form 1040X amendments. The IRS guidance on amended returns sits at https://www.irs.gov/forms-pubs/about-form-1040x.
The fourth mistake is failing to obtain the Consular Report of Birth Abroad (CRBA) for UK-born children. CRBA is the official US document evidencing US citizenship at birth for children born outside the United States to US-citizen parents. Without CRBA, the child cannot obtain a US passport or a U.S. Social Security Number, and the Child Tax Credit citizenship test cannot be met. Applications are made through the US Embassy in London shortly after birth.
The fifth mistake is treating the UK Child Benefit as relevant to the US Child Tax Credit. UK Child Benefit paid by HMRC is a UK-side social security benefit and has no effect on the availability of the US Child Tax Credit — the two operate in separate jurisdictions. UK Child Benefit may be UK tax clawed back through the High Income Child Benefit Charge under FA 2012 Section 8 for UK higher-rate earners, but this is a UK administrative matter only.
The sixth mistake is overlooking FBAR and Form 8938 reporting for UK Junior ISA and UK child savings accounts. UK Junior ISAs in the child’s name are foreign financial accounts. They are reportable on FBAR (FinCEN Form 114) where the parent has signatory authority, and on Form 8938 as specified foreign financial assets where the parent’s combined specified asset values exceed thresholds. The Child Tax Credit position interacts with these broader cross-border compliance obligations and benefits from integrated specialist handling.
Jungle Tax is a UK-based cross-border tax advisory firm specializing in US-UK tax for American families living in the United Kingdom. Our team holds Chartered Tax Adviser (CTA) qualifications through the Chartered Institute of Taxation, with US IRS Enrolled Agent credentials supporting cross-border Form 1040 work. We work with UK-resident American families across the full child tax credit lifecycle — from Consular Report of Birth Abroad coordination at the US Embassy London for newborns, through Form SS-5 Social Security Number application support, to annual Form 1040 preparation with Schedule 8812 claiming the Child Tax Credit and refundable Additional Child Tax Credit.
For UK-resident American families, we deliver the full Form 1040 preparation with Form 1116 Foreign Tax Credit positioning, Schedule 8812 claiming the Child Tax Credit and refundable ACTC for each qualifying child, Form 1040X amendments capturing missed Child Tax Credit claims for prior years within the three-year IRC Section 6511 window, US Embassy London coordination for newborn CRBA and SSN applications, FBAR reporting on UK Junior ISAs and child savings accounts where parental signatory authority exists, and ongoing annual UK-resident American family compliance maintenance under specialist engagement. You can read our broader guidance on our US expat tax services for UK residents.
Contact Jungle Tax today at info@jungletax.co.uk to discuss your family’s Child Tax Credit position and any prior-year amendment opportunities.
Three takeaways matter most for UK-resident American families considering the child tax credit for UK citizens. First, the US Child Tax Credit under IRC Section 24 provides up to $2,000 per qualifying child under 17 with up to $1,700 per child refundable as Additional Child Tax Credit in 2025-26 — meaning UK-resident American parents can receive cash refunds from the IRS even when Form 1116 FTC absorbs all US tax on UK income, with a typical two-child family receiving up to $3,400 of annual refundable ACTC. Second, the qualifying child must hold a valid US Social Security Number issued before the Form 1040 due date — UK-born children typically need to apply for a Form SS-5 through the Federal Benefits Unit at the US Embassy in London, with a processing time of 4 to 8 weeks. Itin-only qualify for the smaller $500 Credit for Other Dependents. Third, Form 1116 Foreign Tax Credit positioning rather than Form 2555 Foreign Earned Income Exclusion is essential for refundable ACTC eligibility because FEIE excluded income is also excluded from the earned income definition for ACTC purposes under IRC Section 24(d)(1)(B)(ii) — UK-resident American families currently filing on FEIE basis should review whether switching to FTC unlocks materially better long-term economics. Speak to a Jungle Tax adviser today by emailing info@jungletax.co.uk or visiting https://www.jungletax.co.uk/services/.
Yes, provided the child meets the qualifying child tests under IRC Section 152 and holds a valid US Social Security Number issued before the Form 1040 due date. UK-born children whose US citizen parents automatically acquire US citizenship at birth under the Immigration and Nationality Act Section 301 transmission rules.
Through Form SS-5 (Application for a Social Security Card) submitted to the Federal Benefits Unit at the US Embassy in London. The application requires the child’s US Consular Report of Birth Abroad, US passport, parents’ identification (US passport for the US-citizen parent), and an in-person interview at the US Embassy.
No. Form 2555 FEIE excludes the underlying earned income from US tax, and IRC Section 24(d)(1)(B)(ii) also excludes that same income from the earned income definition for refundable Additional Child Tax Credit purposes. UK-resident American parents claiming FEIE on their full UK salary, therefore, have $0 earned income for ACTC purposes and forfeit the entire refundable portion. Form 1116 Foreign Tax Credit positioning preserves both the FTC relief and the ACTC eligibility, which is why specialist preparers typically recommend the FTC over FEIE for UK higher-rate earners.
Yes, within the three-year amendment window. Form 1040X amendments are available within three years from the original Form 1040 filing date or two years from the date of payment, whichever is later, under IRC Section 6511. UK-resident American parents who missed Child Tax Credit claims for prior years can typically recover the last three years through Form 1040X amendments, provided the children had valid US Social Security Numbers issued before the original Form 1040 due dates (or before the amendment date for refundable credits). A typical two-child UK family can recover approximately $10,000 to $14,000 of prior-year refundable ACTC through amendment.
No. UK Child Benefit, paid by HMRC, and the US Child Tax Credit, claimed on Form 1040, operate in completely separate jurisdictions with no interaction. UK Child Benefit may be UK tax-clawed-back through the High Income Child Benefit Charge under FA 2012 Section 8 for UK earners with adjusted net income above £60,000 (post-April 2024 threshold), but this is a UK administrative matter only and has no effect on the US side. Receiving UK Child Benefit does not disqualify a UK-resident American family from claiming the US Child Tax Credit, and vice versa.
The Child Tax Credit ends in the tax year the child turns 17. The IRC Section 24 age test requires the child to be under age 17 at the end of the tax year — a child turning 17 on 1 January counts as 16 for that tax year and qualifies; a child turning 17 on 31 December does not qualify for that year. Children aged 17 to 23 (or older if disabled) who remain dependents may qualify for the smaller $500 Credit for Other Dependents under IRC Section 24(h)(4), provided they meet the qualifying relative tests under IRC Section 152(d).
