W-8BEN — tax form for foreign investors

Quick Answer

W-8BEN is an IRS form confirming you are a non-US tax resident, which lets you benefit from a reduced rate on dividends paid by US companies. Without it, your broker withholds 30% US tax from every dividend; after filing, the rate drops to 15% under the Poland–US double taxation treaty. You sign it electronically inside your brokerage account, and it stays valid for about 3 years before requiring renewal. The 15% withheld in the US is then credited against Polish dividend tax, so you typically pay only an additional 4% in PIT.

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What is W-8BEN?

W-8BEN (Certificate of Foreign Status of Beneficial Owner for United States Tax Withholding and Reporting) is a form from the US Internal Revenue Service (IRS) that confirms you are a non-US tax resident. Thanks to it, you can benefit from a reduced tax rate on dividends paid by US companies.

Why is it important?

Without the W-8BEN form, your broker withholds 30% withholding tax from every US dividend. After filing the form, the rate drops to 15% — based on the double taxation treaty between Poland and the United States.

For a dividend portfolio worth 200,000 PLN with a 3% dividend yield, this is the difference between 1,800 PLN and 900 PLN in taxes annually.

Who should file W-8BEN?

Every Polish investor holding:

• US company shares paying dividends
• US ETFs (e.g., listed on NYSE/NASDAQ)
• Other instruments generating US income

You file the form with your broker — both Polish (Bossa, mBank) and foreign (Interactive Brokers, DEGIRO).

How to file W-8BEN?

1. Log into your brokerage account
2. Find the "tax documents" or "W-8BEN" section
3. Fill in your data: name, surname, address, country of residence, PESEL or NIP number
4. Sign electronically
5. Done — your broker will apply the reduced rate

The entire process takes a few minutes and is done online.

Validity and renewal

The W-8BEN form is valid for 3 years from the signing date. After expiration, the broker returns to the 30% rate. Most brokers send renewal reminders — don't ignore them.

W-8BEN and IKE/IKZE

On IKE and IKZE accounts, the situation is complicated. Polish brokers managing IKE/IKZE usually cannot apply the reduced withholding tax rate in the US. Therefore, on retirement accounts, it's better to choose:

• UCITS ETFs based in Ireland (e.g., VWCE, IWDA) — the Irish fund itself benefits from the tax treaty with the US (15% instead of 30%)
• Accumulating ETFs — dividends reinvested within the fund, without a taxable event

Polish tax settlement

Tax withheld in the US (15%) is deducted from Polish dividend tax (19%). So you only pay an additional 4% in PIT-36 or PIT-38. This is the proportional deduction method.

How Freenance can help

Freenance tracks your foreign investments and helps estimate tax liabilities — including withholding tax and the amount to pay in Poland. Everything in one view, without manual calculations.

👉 Manage taxes from foreign investments — freenance.io

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FAQ

Do I have to file W-8BEN as a Polish tax resident?

If you hold US-listed shares, US ETFs or any instruments paying US-source income, your broker generally needs a valid W-8BEN to apply the treaty rate. Without it, the default 30% US withholding is applied to dividends. This is general educational information, not tax advice.

How much does W-8BEN actually save me on US dividends?

Under the US–Poland tax treaty, a valid W-8BEN typically reduces US dividend withholding from 30% to 15%. On a 1,000 PLN gross dividend that means about 150 PLN of US tax withheld instead of 300 PLN. Your final Polish tax settlement is separate and based on PIT rules.

How long is a W-8BEN valid?

A W-8BEN is generally valid for the year it is signed plus the following three calendar years, so roughly three years in practice. After that the broker is required to treat you as undocumented and apply the higher rate again until you refresh the form. Most brokers send reminders before expiry.

Does W-8BEN cover capital gains as well?

W-8BEN mainly affects US-source passive income such as dividends and certain interest. Capital gains from selling US shares are usually not subject to US withholding for non-US residents and are taxed in Poland under PIT-38 rules. Always check with a tax adviser for your specific situation.

Can I file W-8BEN myself on paper?

In most cases you sign the form electronically inside your brokerage account rather than mailing a paper form. The broker stores it and applies the reduced treaty rate going forward. If you change name, address or tax residency you should update the form to keep it valid.