For non-resident aliens (NRAs), estate tax treaties can unlock a powerful benefit:

👉 Access to a prorated share of the full U.S. unified credit

Instead of being limited to the standard $60,000 exemption, eligible taxpayers can calculate a proportional exemption based on their global wealth.

⚖️ 1️⃣ The Core Formula

Under treaty provisions modifying the

Internal Revenue Code:

👉 The unified credit is calculated as:

(U.S.-situs assets ÷ Worldwide assets) × Full U.S. unified credit

📊 2️⃣ How It Works (Conceptually)

Step 1: Identify U.S.-Situs Assets

• U.S. real estate

• U.S. securities

• Other assets considered located in the U.S.

Step 2: Determine Worldwide Assets

• All global assets owned at death

• Including both U.S. and non-U.S. property

Step 3: Apply the Ratio

• Calculate the proportion of U.S. assets relative to total wealth

• Apply that percentage to the full U.S. exemption

🧠 3️⃣ Why This Approach Exists

The prorated method aims to:

• Ensure equitable treatment between:

U.S. citizens
Non-resident treaty beneficiaries

• Prevent over-taxation where only part of the estate is U.S.-connected

⚠️ 4️⃣ The Critical Risk: Valuation

Accuracy is everything.

Errors in:

• Asset classification

• Valuation of worldwide assets

👉 Can lead to:

• Incorrect credit calculation

• Overpayment or underpayment of tax

• IRS challenges on audit

📄 5️⃣ Practical Challenges

• Gathering reliable global asset data

• Valuing illiquid or foreign assets

• Currency conversion issues

• Documentation requirements

🎯 Key Takeaway

The prorated unified credit:

• Allocates the U.S. exemption based on asset proportion

• Can significantly reduce estate tax exposure

• Requires precise valuation and documentation

In practice:

A small error in global valuation can translate into a large difference in U.S. tax liability.