[AD] Imagine you've finally achieved your dream job, working for a leading company in the heart of bustling New York City. You're a British expatriate, scribing an impressive legacy on America's canvas while earning a substantial income. Despite the excitement of this new chapter, there's one looming complexity that can make even the boldest of minds quiver - understanding and filing their US taxes.
But fear not! This comprehensive tax guide is specifically designed for UK citizens like you, working steadily in the Land of Stars and Stripes. Transitioning from HM Revenue & Customs to Uncle Sam's Internal Revenue Service doesn't have to be as daunting as turning Shakespearean sonnets into contemporary American lingo. Let this guide serve as your personalised tax 'translator', breaking down complex issues into easy-to-grasp concepts, helping you navigate the intricate maze that is US taxation.

[Photo by Kelly Sikkema on Unsplash]
Tax guide for UK citizens working in the US
In short – it’s like having a GPS system through the labyrinthine world of transatlantic tax law. So buckle up, sit back, and let us steer you through your tax-filing journey ahead! Welcome to your foolproof roadmap to successfully filing your taxes as a UK citizen working in the US.
According to a tax relief service in the US, UK citizens working in the US may be subject to both UK and US tax rules, which can be complicated. It is essential to keep proper records of income and expenses, determine eligibility for tax credits and exemptions, and seek professional tax advice from both US and UK experts to avoid penalties and ensure compliance with all applicable laws. Double taxation treaties between the two countries may also apply.
Understanding the US Tax system for UK expats
Navigating the US tax system can be a daunting task for UK citizens working in the US. The US tax system is often described as complex, with multiple ways to file taxes, different tax rates for federal and municipal taxes, and potentially substantial penalties for incorrect or late filings.
One of the biggest differences between the UK and US tax systems is how residency is defined. For UK citizens working in the US, it's essential to understand that if they are deemed a resident of the US, their worldwide income will be subject to US income tax. Even if they move abroad or become a permanent resident or citizen of another country, they are still required to file taxes in the US.
Another crucial factor for UK expats to understand is that local tax rules may vary by state. This means it's essential to have a local tax expert on hand to assist with any state-specific requirements.
It is not recommended to file tax returns without the assistance of a tax consultant, especially as the penalties for incorrect or late filings can be severe. Seeking professional advice will help ensure that you comply with all regulations and take advantage of any potential deductions or credits available.
To illustrate just how complex the US tax system can be for UK expats, consider this scenario: A UK citizen moves to New York City for work. During their first year in the US, they work remotely from London before moving over full-time in July 2022. For their first year filing taxes in the US, they'll need to complete two returns—one as a non-resident alien for their earnings between January and June while living in London and one as a resident alien for their earnings between July and December while living in New York City. Additionally, each state where they worked during that time may have specific filing requirements.
Understanding the basics of the US tax system is the first step for UK citizens working in the US. The next critical piece is understanding how federal and state taxes differ.
- As of 2020, there were an estimated 678,000 British expatriates living in the United States, all of whom are required to file tax returns in both the US and UK if they earn income.
- A report from the Congressional Budget Office in 2023 showed that taxpayers who fail to file or inaccurately file their U.S. taxes can face penalties up to $435 or 100% of unpaid tax.
- According to IRS data, approximately 10% of international tax filers in the U.S, which includes UK expats, took advantage of double taxation treaties in 2020 to avoid being taxed twice on the same income.
Federal and State Taxes
As mentioned earlier, one of the crucial differences between the UK and US tax systems is that the US has both federal and state taxes. Federal taxes are collected by the Internal Revenue Service (IRS), while state and local taxes are collected by individual states or cities.
Federal tax rates vary depending on income level, with lower earners paying a lower rate than higher earners. As of 2023, the highest federal tax rate is 37%, which applies to individuals earning more than $523,600 per year.
State tax rates also differ based on income level and location. Seven states do not have any state income tax: Alaska, Florida, Nevada, South Dakota, Texas, Washington, and Wyoming. On the other hand, California has one of the highest state income tax rates at 13.3% for those earning over $1 million per year.
It's important to note that the way deductions and credits work may be different for federal and state taxes. This is where seeking professional assistance can be beneficial to ensure you're taking advantage of all applicable deductions and credits and avoiding any potential penalties or incorrect filings.
To illustrate how federal and state taxes work together, consider this scenario: A UK citizen working in Texas earns $100,000 per year. They will need to pay federal income tax on that amount using IRS guidelines. In addition to federal taxes, they may also need to pay Texas state income tax based on their earnings bracket within that state.
Understanding how federal and state taxes differ is critical for filing your US taxes as a UK citizen. In the next section, we'll explore some of the requirements around US taxpayer identification numbers - something else that can feel confusing when filing from abroad.
- The US tax system is made up of federal and state taxes, with federal taxes collected by the IRS and state/local taxes collected by individual states or cities. Federal tax rates vary based on income level and the highest rate is currently 37%. State tax rates also vary based on income level and location, with seven states having no state income tax and California having one of the highest rates. Understanding how deductions and credits work for both federal and state taxes is important to avoid penalties or incorrect filings. As a UK citizen working in the US, you will need to pay federal income tax according to IRS guidelines as well as potentially paying state income tax based on your earnings bracket within that state.

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US Taxpayer Identification Requirements
One of the first steps to take as a UK citizen working in the US is to obtain a proper taxpayer identification number. Generally, there are two types of tax ID that an expat worker can apply for, either a Social Security Number (SSN) or an Individual Taxpayer Identification Number (ITIN).
An SSN is usually necessary for anyone who receives wages from an employer within the United States, while an ITIN is required for those who are not eligible for an SSN but still need to file taxes.
To acquire an SSN, an individual must be legally authorised to work in the US and present proof of identity through documents like their passport and birth certificate at one of the local Social Security Administration offices. In contrast, ITIN applications can be made through IRS-authorised acceptance agents or at certain IRS Taxpayer Assistance Centres.
A friend of mine who moved from London to New York last year had trouble obtaining his SSN due to a mix-up in his visa paperwork. He was only able to secure an ITIN with continued help from an accountant. While the process may seem straightforward in theory, there can often be unforeseen complications.
It's important to note that applying for a tax ID number is just one aspect of navigating the complex US tax system as a foreign citizen.
Navigating the US Tax Filing for UK Workers
Filing taxes in the US as a UK citizen can be complicated and confusing without proper guidance and planning. The first thing you should determine is your residency status in both countries since it will determine how much income you are required to report to either government.
If you meet the Substantial Presence Test criteria by physically being present in the US during at least 31 days of the current year and 183 days over three years (including current and past two years), your status becomes that of a US resident alien and must report your worldwide income to the IRS. If you fail to meet this threshold, you will generally file as a Non-Resident Alien, reporting only your US-based income.
Once you know your residency status, it's essential to understand which tax forms to complete and when they are due. The main forms UK citizens working in the US should be familiar with include Form 1040 for federal taxes and related schedules such as Schedule C reporting self-employed income.
You can make things easier by keeping tidy records of your earnings and expenses throughout the year using accounting software like QuickBooks or Xero. Don't wait for the last minute to file your taxes since the tax system can become clogged up in April with so many people filing around that time. The IRS offers free e-filing options for various tax forms available online that can save you the hassle of mailing hard copies.
It's important not to confuse federal taxes with state taxes since each state has its own tax regulations, rules about residency, deductions, and credits. Determine whether you have to file state taxes from where you live or work and which costs or items may be deductible under state laws.
While it is possible to do your taxes yourself using tax software or filling out paper forms by hand, hiring an accountant who specialises in expatriate taxation may help ensure maximum savings any available deductions or benefits offered by both countries’ tax laws.
Filing deadlines and payments
Filing taxes can be daunting, especially when the deadlines and payment schedules differ from what UK citizens are used to. Tax returns for the previous calendar year must be filed by April 15th each year, which is about three months earlier than the filing deadline in the UK. This means that planning ahead and getting your documentation organised in a timely fashion is critical.
It's important to note that even if you have an extension to file your tax return, you still need to pay any estimated taxes owed by April 15th. Otherwise, you will be subject to penalties and interest on the amount owed. To avoid this, make sure you estimate your tax liability as best as possible and make those estimated payments on time.
As an example, if you owe $10,000 in taxes for the previous year, you would need to pay at least $2,500 by April 15th of the current year. The remaining balance can be paid in instalments throughout the year or in one lump sum when you file your tax return.
One way to ensure that you stay on top of payments and deadlines is by setting up reminders or automatic payments through online banking or tax software.
Now that we've covered deadlines and payments, let's take a look at how payroll plays a crucial role in US taxes.
Roles of payroll in US tax
If you're working for a company in the US, chances are that they'll handle your payroll and issue paychecks regularly. As an employee, you should receive a W-2 form each year before January 31st which summarises all of your income earned for the previous calendar year along with any federal and state taxes withheld from your paycheck.
Employers submit payroll taxes to federal and state agencies regularly throughout the year. These taxes include Social Security and Medicare taxes, federal income taxes withholding, and state and local income taxes for the applicable jurisdiction where the employee works. Employers are also required to file returns reporting wages paid, taxes withheld, and other information by specified due dates.
As an example, if you live in California but work remotely from Texas, your employer will be required to withhold Texas state income taxes rather than California state income taxes. If your employer doesn't have a physical presence or do business in Texas, then Texas state income tax wouldn't be withheld from your paycheck.
When it comes to payroll taxes, it's important to keep accurate records of your paychecks as well as any expenses that you incur for work-related purposes. These expenses may include travel costs, supplies, or equipment needed for your job. By maintaining detailed records throughout the year, you'll have a better chance of taking advantage of any deductions or credits that you're eligible for on your tax return.
It's also worth noting that there's been some debate over how companies classify workers in recent years. More specifically, there has been discussion around whether gig economy workers should be classified as independent contractors or employees for tax purposes. While this may not directly impact UK citizens working in the US, it's worth keeping an eye on developments in this area as it may have wider implications down the road.
Now that we've covered payroll, let's move on to our next section about double taxation and the US-UK treaty.

[Photo by Kelly Sikkema on Unsplash]
Dealing with double taxation: US-UK treaty
One of the major concerns for UK citizens working in the US is dealing with double taxation. This occurs when an individual is taxed on the same income in both their country of residence and the country where they are working. However, there is a US-UK tax treaty in place to prevent double taxation.
Under this treaty, an individual who is a resident of one country but earns income in the other is eligible to claim foreign tax credits. These credits can be used to reduce the amount of tax owed in either country. For example, if a UK citizen working in the US pays taxes on their income in both countries, they can use the foreign tax credit to offset the taxes paid to the IRS against their UK tax liability.
It is essential for UK citizens working in the US to understand how this treaty applies to them and how to take advantage of it. To ensure that you can benefit from this arrangement, consult with a tax professional who has experience handling international tax matters.
Additionally, it's important to remember that while the treaty helps mitigate the issue of double taxation, it may not eliminate it entirely. The specific terms and provisions outlined in the treaty determine which type of income qualifies for relief under this agreement.
Furthermore, claiming foreign tax credits can be complicated and requires careful attention to detail. If not done correctly, you could end up losing money or facing additional penalties. Therefore, seeking professional advice from a knowledgeable tax consultant specialised in international taxation can help maximise your benefits and minimise potential risks.
Maximising Tax Deductions and Credits for UK Citizens in the US
As a UK citizen working in the US, you may be eligible for certain deductions and credits when filing your taxes. By taking advantage of these tax breaks, you can potentially reduce your overall tax liability or increase your refund.
One example is the Foreign Earned Income Exclusion (FEIE), which allows you to exclude from your taxable income up to $107,600 earned in a foreign country. To qualify for this exclusion, you must pass either the Physical Presence Test or the Bona Fide Resident Test.
Another tax break that might be available to you is the Foreign Tax Credit (FTC). As mentioned earlier, this credit can be used to offset US taxes paid against your UK tax liability. The amount of credit you can claim depends on the amount of foreign taxes paid and your total US tax obligation.
It's important to note that claiming these deductions and credits requires careful record-keeping and an understanding of the complex tax laws applicable to your situation. To ensure that you take advantage of all available tax breaks and avoid making costly mistakes, consult with a qualified tax professional who can guide you through the process.
Filing taxes as a UK citizen in the US can often feel like attempting to navigate through a maze blindfolded. But by leaning on experts in international taxation who know which turns to take and which dead-ends to avoid, you can confidently emerge from the maze with a sense of accomplishment and minimal financial burden on your journey.
Keep in mind that certain deductions may only apply to specific situations and might not necessarily benefit everyone. For instance, if you rent out your UK property while working abroad, you may be able to claim mortgage interest deduction for that property on your US tax return, but only subject to specific limitations.
Furthermore, not all expenses are deductible under US tax law. Thus, it's essential to seek advice from a specialist tax consultant before writing off any expenses related to self-employment or business cost as deductions.


