When foreign business owners and investors plan to move to the United States, their financial strategy needs to include pre-immigration tax planning. This can significantly impact their tax liabilities and overall financial health once they become U.S. residents. One effective strategy in this context is the basis step-up, which can help mitigate future tax burdens.
This planning strategy is widely used in inbound planning, but outcomes depend heavily on:
- The type of asset (e.g., marketable securities vs. PFIC funds vs. closely held business interests),
- The inbound taxpayer’s residency start date under the substantial presence/green card rules and any applicable treaty “tie-breaker,” and
- Whether the step-up is achieved under foreign law, U.S. tax principles, or both.
Below, we delve into additional practical considerations to help avoid common “step-up” misconceptions and compliance pitfalls.
Understanding Basis Step-Up
The basis of an asset is essentially its original value for tax purposes, usually the purchase price. When an asset appreciates, tax law treats the difference between its current market value and its basis as a capital gain, and you pay tax on it when you sell the asset. A basis step-up adjusts an asset’s basis to its current fair market value, which reduces the taxable gain when someone eventually sells the asset.
Why Basis Step-Up Matters
For foreign business owners and investors, the basis step-up can be a powerful tool to minimize U.S. taxes on appreciated assets. By stepping up the basis of their foreign assets before becoming U.S. tax residents, they can effectively eliminate the U.S. tax on the appreciation that occurred before their move.
The following examples are simplified for illustration and are not tax advice. Actual outcomes depend on the taxpayer’s start date, asset details, and local-country tax rules.
Example 1 – Marketable securities held personally
An individual who owns appreciated publicly traded shares in a non-U.S. brokerage account may be able to execute a pre-residency transaction that supports a higher fair market value “starting point” for U.S. capital gain purposes. In practice, careful timing (before U.S. residency begins) and clear records (statements showing trade dates, prices, and FX rates) are often as important as the concept itself.
Example 2 – Non-U.S. mutual funds/ETFs (PFIC exposure)
An inbound individual may assume that stepping up basis in a non-U.S. fund eliminates U.S. tax on pre-move appreciation. However, if the holding is a Passive Foreign Investment Company (PFIC), the U.S. tax and reporting regime can produce unfavorable results regardless of “basis” concepts used for other capital assets. In many cases, planners evaluate a pre-residency exit from PFIC holdings or other restructuring rather than relying solely on a step-up approach.
Example 3 – Interest in a closely held foreign company
A founder moving to the U.S. may focus on stepping up basis in shares before immigrating to reduce U.S. capital gain on a future sale. But once the founder becomes a U.S. person, the company itself may become a controlled foreign corporation, potentially triggering ongoing U.S. tax and annual reporting even without a sale. As a result, inbound planning often combines basis considerations with “day-one” ownership/structure analysis (including entity classification and cash-flow planning for potential U.S. tax liabilities).
Example 4 – Foreign real estate
An inbound individual who owns appreciated foreign real estate (a personal residence, a rental property, or land) may want to “reset” basis before U.S. residency begins. Real estate planning often turns on practical execution: obtaining a credible valuation (and keeping the appraisal and supporting comparables), tracking capital improvements, and modeling whether a pre-residency transfer or sale would trigger local transfer taxes, stamp duties, notary fees, or withholding.
Additional Considerations
- Residency start date drives what is “pre-U.S.” appreciation. For many inbound individuals, the U.S. tax residency start date can differ depending on the substantial presence test, green card status, “first-year choice,” and — if applicable — treaty tie-breaker positions. A transaction intended to occur before U.S. tax residency should be timed with the correct residency start date in mind.
- Foreign trusts (and certain foreign retirement arrangements) are a frequent trap. Trust distributions, grantor trust status, and reporting (e.g., Forms 3520/3520-A in many cases) can create unexpected U.S. tax and penalty exposure. If trusts are involved, step-up planning should be coordinated with trust characterization and potential pre-immigration restructuring.
- Entity “check-the-box” classification and local law constraints matter. A deemed sale or internal reorganization that is straightforward for individuals can become complex when assets are held through non-U.S. entities. Inbound planning frequently requires modeling how the entity will be classified for U.S. tax purposes and whether a transaction is respected across jurisdictions.
- Valuation and documentation are not optional. Any approach that relies on fair market value should be supported with contemporaneous documentation (appraisals for real estate/business interests, brokerage statements for marketable securities, cap tables, purchase agreements, etc.). This is especially important for hard-to-value assets and related-party transactions.
- Foreign tax consequences and foreign tax credit interactions should be modeled. Some “step-up” approaches trigger local tax, stamp duty, or withholding, or create timing mismatches that limit foreign tax credit utilization after U.S. residency begins. Coordinating U.S. and local-country tax outcomes is essential.
Steps to Implement Basis Step-Up
- Identify eligible assets: Start by identifying which assets are eligible for a basis step-up. This typically includes stocks, real estate, and business interests that have appreciated in value.
- Trigger a deemed sale: One common method to achieve a basis step-up is through a deemed sale before becoming a U.S. tax resident. This sale is arranged so it results in no U.S. or foreign tax but still increases the basis of relevant assets to fair market value.
- Timing and documentation: Timing of the deemed sale is critical in this process. Proper asset documentation and valuation are essential to support the basis step-up and withstand potential scrutiny from tax authorities.
- Consult with tax professionals: Given the complexity of international tax laws and the significant financial implications, it is wise to work with experienced tax professionals who specialize in pre-immigration planning. They can provide tailored advice and ensure compliance with all relevant regulations.
Benefits of Basis Step-Up
- Tax savings: By stepping up the basis of their assets, foreign business owners and investors can significantly reduce their U.S. capital gains tax liability on future sales.
- Simplified tax reporting: A higher basis can simplify tax reporting and reduce the administrative burden associated with tracking the original purchase price and subsequent appreciation.
- Enhanced financial planning: This strategy allows for more accurate financial planning and wealth management, providing a clearer picture of the person's net worth and potential tax obligations.
Pre-Immigration Tax Planning Checklist
- Confirm your expected U.S. tax residency start date and whether treaty provisions apply.
- Inventory non-U.S. holdings and flag PFIC exposure (common with non-U.S. pooled funds).
- Identify interests, such as closely held business interests, that could become Controlled Foreign Corporations (CFCs) once you are a U.S. person and model ongoing U.S. tax/reporting.
- Evaluate whether any pre-residency transactions or restructuring are advisable for assets that often require special inbound planning (e.g., PFIC holdings and foreign trusts).
- Obtain valuations and preserve supporting documentation for key assets near the residency start date.
- Model foreign tax costs, withholding, and whether post-move foreign tax credits are likely to be usable.
- Coordinate U.S. and local-country advisors before executing any related-party transfers or reorganizations.
M&S International is Here to Help
Pre-immigration tax planning, including the basis step-up strategy, is essential for foreign business owners and investors moving to the U.S. By taking proactive steps to adjust the basis of their assets, they can optimize their tax position and ensure a smoother financial transition to their new life in the United States. Consulting with skilled international tax professionals is crucial to navigate this complex process and achieve the best possible outcomes.