How are foreign tax credits treated in cases of significant differences in tax rates?

FULL QUESTION

How are foreign tax credits treated in cases of significant differences in tax rates? For example, are US expats in the UK, where the tax rate is 40-45%, due to a UK tax credit with significantly lower tax rates in the US?

ADDITIONAL WRITTEN ANSWER

In cases where there is a significant difference in tax rates between two countries, such as US expats in the UK, the treatment of foreign tax credits (FTCs) can be complex and may vary depending on specific country agreements and the mechanisms available under domestic tax laws. Here’s a breakdown of how this might work for US expats in the UK:

1. US Foreign Tax Credit Mechanism

• The US offers an FTC to prevent double taxation for citizens or residents earning income abroad, allowing them to offset US tax liabilities with taxes paid to a foreign country.
• The credit is typically limited to the amount of US tax on foreign-source income. If the UK tax (40-45%) is higher than the US tax rate (up to 37% on the top end of the US scale), the FTC might not fully cover the higher UK taxes.
• In such cases, US expats may not receive a credit for the full amount of UK taxes paid, resulting in “excess credits” that can be carried forward or back.

2. Excess Credits and Carryover Options

• Carryback and Carryforward: US tax law allows unused foreign tax credits to be carried back one year or carried forward for up to ten years. This can be useful if expats experience years where they earn less or have varying foreign income levels.
• Excess Limitation by Income Type: Since FTCs apply on a per-country and per-income-type basis, having “excess credits” for UK taxes might still benefit expats in future years if their tax profile changes or if they have different types of income (e.g., passive or earned income), which might allow for a different credit allocation.

3. Foreign Earned Income Exclusion (FEIE)

• The Foreign Earned Income Exclusion allows US taxpayers to exclude up to $108,700 (for 2024) of foreign earned income. However, this exclusion also reduces the foreign tax credit available on remaining income. Some expats find it beneficial to combine both FTC and FEIE, but this depends on individual tax calculations.

4. US-UK Tax Treaty Provisions

• While there isn’t specific relief for high-tax jurisdictions like the UK directly within the tax treaty, the US-UK Tax Treaty can help by defining residency and preventing double taxation. The treaty does not, however, typically alter the FTC limitations or allow the US tax rate to match higher foreign tax rates.

5. Higher Foreign Taxes and FTC Impact

• In high-tax countries like the UK, expats will likely pay more in UK tax than what the US would levy on the same income. The result is often unused foreign tax credits. Planning strategies could include using these excess credits to offset future income or, in some cases, strategic income timing.

Example Calculation (Simplified)

• UK Tax Paid: Assume $100,000 income with 45% UK tax = $45,000 in tax paid to the UK.
• US Tax Liability: On the same income at the top US marginal rate (37%), the US tax liability might be around $37,000.
• FTC Application: The taxpayer can claim a credit up to $37,000 on their US tax return. The remaining $8,000 in UK taxes is an excess foreign tax credit, potentially usable in other years.

In summary, when high foreign taxes exceed US tax rates, FTCs offset US tax to the extent allowed, and excess credits may be carried over. However, without modifications to either FTC limits or treaty terms, some expats will pay higher net taxes. Tax planning and leveraging exclusions and credits can help manage this disparity.