Comparison
Foreign Tax Credit vs US–UK Tax Treaty
The foreign tax credit and the US–UK tax treaty are two different tools for avoiding double taxation. The foreign tax credit is US domestic law that offsets US tax with UK tax already paid. The treaty is a bilateral agreement that allocates taxing rights over particular income types. They work together rather than competing.
The short answer
A mechanism and an agreement
The foreign tax credit and the US–UK tax treaty are easy to conflate because both reduce double taxation. But one is a credit built into US law, and the other is a treaty that decides which country taxes what. They solve the same problem from different directions.
| Foreign Tax Credit | US–UK Treaty | ||
|---|---|---|---|
| Source | US domestic law | Bilateral agreement | |
| Function | Offsets US tax with UK tax paid | Allocates taxing rights | |
| Applies to specific income types | Broadly | By article | |
| Affected by the saving clause | |||
| Commonly used by Americans in the UK |
- Source
- US domestic law
- Function
- Offsets US tax with UK tax paid
- Applies to specific income types
- Broadly
- Affected by the saving clause
- Commonly used by Americans in the UK
Foreign Tax Credit
- Source
- Bilateral agreement
- Function
- Allocates taxing rights
- Applies to specific income types
- By article
- Affected by the saving clause
- Commonly used by Americans in the UK
US–UK Treaty
- Source
- Function
- Applies to specific income types
- Affected by the saving clause
- Commonly used by Americans in the UK
How they interact in practice
The treaty can say which country has the first or sole right to tax a given item of income. Where income remains taxable in both countries, the foreign tax credit steps in to offset the US liability with UK tax paid. For US citizens, the treaty\u2019s saving clause limits some treaty benefits, which is why the credit tends to do much of the heavy lifting.
The practical skill is knowing which tool to reach for on which income — and documenting the position on the right forms, such as Form 8833 for treaty-based positions.
This helps if you
- Have UK income also taxable in the US
- Are unsure whether to rely on the credit or the treaty
- Have heard of the saving clause and want to understand it
- Want to make sure you are not paying more than necessary
At a glance
- Foreign tax credit
- US law — offsets US tax with UK tax
- Treaty
- Bilateral — allocates taxing rights
- Saving clause
- Limits some treaty benefits for US citizens
- Relationship
- Complementary, often used together
Related resources
Frequently asked questions
The foreign tax credit is a mechanism in US domestic law that offsets US tax with foreign tax already paid. The US–UK tax treaty is an agreement between the two countries that allocates taxing rights over particular types of income.
They operate at different levels and are often considered together. The treaty can determine which country has the primary right to tax an item of income; the foreign tax credit then relieves double taxation on income that remains taxable in both.
Both contribute. The treaty allocates rights and can reduce or eliminate tax on certain income; the foreign tax credit relieves double tax where the same income is taxable in both countries.
They are complementary rather than competing. Because US citizens are affected by the treaty’s saving clause, the foreign tax credit often remains the workhorse for relieving double taxation, with the treaty applying to specific income types.
Getting relief the right way?
We combine the credit and the treaty correctly so you claim every relief you are entitled to.