Find the situation that matches yours.
Cross-border tax is not one problem. An American who moved to London last year, a founder holding US options, and a family running a trust across both countries need entirely different work. Start with the case closest to yours.
Americans in the UK
You file with the IRS every year regardless of where you live, and with HMRC on top. Both positions need preparing together.
Brits in the US
UK income, property or pensions that follow you across, plus US residency rules that decide what becomes reportable and when.
Dual citizens
Two citizenships means two sets of obligations that never fully overlap. The treaty decides which country has first claim on what.
Accidental Americans
Born in the US but raised elsewhere, and only now finding out you have been required to file. Usually fixable, and penalty-free if you live abroad and qualify.
Green Card holders
A Green Card keeps you inside the US tax net even after you leave, until it is formally given up. Timing that badly is expensive.
Planning a move
The year you relocate is the one with the most room to plan and the most to get wrong. Best handled before the move, not after.
High-net-worth individuals
Multiple income sources, holdings across both countries, and estate exposure to two authorities that each want their share.
Founders & equity holders
Share options, QSBS, EIS and SEIS relief, and an exit that is taxed very differently depending on which side you are sitting on.
Contractors & freelancers
Self-employment across borders, with self-employment tax, National Insurance and the treaty provisions that stop you paying both.
Landlords & property owners
Rental income reported to both authorities on different rules, and a sale where currency movement alone can create a taxable gain.
Retirees & pensioners
Drawing on a pension built in one country while living in the other, where a tax-free lump sum may not stay tax-free.
Families & trusts
Gifts, inheritances and trust structures that each authority reads differently, with reporting that catches people unaware.
Businesses expanding abroad
Entity structuring in either direction, permanent establishment risk, transfer pricing and the reporting that follows.
Investors & fund holders
UK funds that are PFICs to the IRS, US funds with their own UK treatment, and reporting obligations on both sides.
More than one of these fits?
That is normal, and it is exactly where a coordinated position matters most. Tell us the full picture and we will scope it properly.