How to Open a Joint Investment Account in Europe: Rules, Steps, and Pitfalls for Couples in 2026

Opening a joint investment account in Europe can be a smart move for couples who want to invest together, simplify finances, and plan for the future. However, the process is not as straightforward as opening a single account, and there are unique legal, tax, and practical pitfalls to avoid—especially with popular brokers like Trade Republic, DEGIRO, and Interactive Brokers. This tutorial will walk you through the process step by step, using real European examples and platform-specific instructions for 2026.

Step 1: Decide Why and How You Want to Invest Jointly

What to do: Sit down with your partner and clarify your investment goals (e.g., retirement, home purchase), risk appetite, and expectations for managing the account.

Why it matters: Joint accounts require trust, but also clarity about how you'll contribute, make decisions, and what happens in case of death or separation. Different account structures (e.g., “joint tenants” vs. “tenants in common”) have different legal implications, especially across European countries.

• Example: In Germany or Austria, a joint account typically means “undivided ownership.” In France or Spain, civil law may treat joint assets differently, especially for married vs. unmarried couples.

What can go wrong: If you don’t agree on these points up front, disputes can arise—especially regarding withdrawals, rebalancing, or tax reporting.

Step 2: Choose a Broker That Supports Joint Accounts in Your Country

What to do: Compare EU-accessible brokers to check if they offer joint accounts to residents of your country. Here’s how the main ones stack up in 2026:

• Trade Republic: Does NOT currently support joint accounts (as of 2026). You can only open individual accounts.
• DEGIRO: Supports joint accounts for most EU residents. Both parties must reside in the same country and meet KYC (Know Your Customer) requirements.
• Interactive Brokers (IBKR): Supports joint accounts across the EU. Offers “Joint Tenants with Rights of Survivorship” (JTWROS) and “Tenants in Common” (TIC) structures.

Why it matters: Not all brokers offer joint accounts or the same legal structures. Choosing the right platform determines how your assets are owned, inherited, and taxed.

What can go wrong: Trying to “share” a single-person account is a violation of most brokers’ terms and can lead to account closure or tax issues.

Step 3: Gather Required Documentation for Both Account Holders

What to do: Collect these documents for both partners:

• Valid government-issued ID (passport or EU national ID card)
• Proof of address (utility bill, bank statement, or official letter dated within the last 3 months)
• Tax Identification Number (TIN) for your country of residence
• Bank account details (joint or one in either name, depending on broker policy)

Why it matters: EU anti-money laundering (AML) and KYC rules are strict. Missing or invalid documents will delay or block your application.

What can go wrong: Mismatched addresses or expired documents are the most common reasons for rejection.

Step 4: Complete the Online Application (Platform-Specific Instructions)

What to do: Start the application on your chosen broker’s website. Here’s how it works for the main platforms:

• DEGIRO:
  1. Go to DEGIRO’s homepage and select “Open an Account.”
  2. Choose “Joint Account.”
  3. Enter personal details for both account holders. Both must verify their email addresses and mobile numbers.
  4. Upload required documents for both partners.
  5. Link a bank account in the same name(s) as the DEGIRO joint account.
  6. Wait for verification (typically 1–3 business days).
• Interactive Brokers (IBKR):
  1. Visit Interactive Brokers’ registration page.
  2. Select “Joint Account” and choose your ownership structure (JTWROS or TIC). JTWROS means assets pass directly to the surviving partner; TIC allows you to specify ownership percentages (e.g., 50/50).
  3. Complete the application for both partners, including personal, financial, and tax information.
  4. Upload documents and complete identity verification for both parties.
  5. Fund the account from a joint or either individual’s bank account (check IBKR’s country-specific requirements).

Expected outcome: After approval, you’ll both have access to the joint account dashboard and can begin investing together.

What can go wrong: If names or addresses don’t match exactly between your IDs and bank documents, your account may be rejected or delayed. Some brokers may request additional documentation or video verification.

Step 5: Understand Taxation, Reporting Rules, and Ownership Implications

What to do: Learn how joint account assets are taxed in your country. In most EU countries, investment income (dividends, interest, capital gains) is split equally between both account holders for tax reporting, unless you specify a different ownership structure (e.g., 70/30 in TIC accounts).

• Example: In Spain, joint account holders must each declare half of all realised gains and dividends on their annual tax returns, unless legal documentation says otherwise. In Germany, “Ehegatten” (married couples) may benefit from joint tax allowances, but unmarried couples do not.

Why it matters: Misreporting can trigger audits or penalties. Tax treatment of joint investment accounts can differ for married vs. unmarried couples, and for residents vs. non-residents.

What can go wrong: If you fail to declare your share of gains, or if ownership is unclear, you risk double taxation or legal disputes—especially in case of inheritance or separation. Review your country’s rules and consult a tax advisor if unsure.

For more on tax-efficient investing, see The Best Tax-Efficient Investing Strategies for Europeans in 2026.

Step 6: Fund Your Account and Make Your First Investment

What to do: Transfer funds from your joint bank account (or as allowed by your broker). Start with a diversified, EUR-denominated ETF to keep things simple and tax-efficient.

• Example: On DEGIRO, after your joint account is approved and funded, search for “iShares Core MSCI World UCITS ETF (Acc)” (ISIN: IE00B4L5Y983), set the desired investment amount (e.g., €2,000), and place your order.
• On IBKR, navigate to “Trade” → “Stocks/ETFs” → enter the ETF ticker (e.g., SWDA for the same iShares ETF), review the order, and confirm.

Expected outcome: You should see your first ETF purchase confirmed with a value of approximately €2,000 (minus any fees).

What can go wrong: Funding from a non-matching bank account can trigger compliance checks. Always use a bank account in the same names as your joint investment account.

Step 7: Plan for Death, Separation, or Disagreement

What to do: Document what happens to your joint account in case of death, divorce, or dispute. This is especially important for unmarried couples or those in countries with forced heirship laws (e.g., France, Italy).

• For IBKR “JTWROS” accounts, the surviving partner automatically inherits the assets.
• For “TIC” accounts, each partner’s share is inherited according to their will or national intestacy law.
• For DEGIRO, assets are typically split 50/50 unless otherwise agreed. Contact customer support for specific instructions in your jurisdiction.

Why it matters: Without a clear plan, your partner may be unable to access funds or face legal battles with heirs. In some countries, joint accounts do not override inheritance law.

What can go wrong: If one partner dies or you separate, the process for dividing assets can be slow, expensive, or contested—especially if you have no written agreement or will.

Common Mistakes When Opening a Joint Investment Account in Europe

• Assuming all brokers offer joint accounts in your country—always check first.
• Not clarifying ownership structure (JTWROS vs. TIC) and the implications for inheritance and taxes.
• Using individual bank accounts to fund a joint account, triggering compliance flags.
• Neglecting to update tax authorities about joint ownership or failing to split income correctly in tax returns.
• Not planning for separation or death, especially as an unmarried couple.
• Overlooking platform-specific restrictions (e.g., Trade Republic doesn’t support joint accounts as of 2026).

Next Steps

• Review your country’s tax and inheritance rules for joint assets. For more on tax minimisation, see How to Minimise Taxes on International Dividends as a European Investor.
• Consider strategies for tax-loss harvesting with UCITS ETFs to further optimise your joint portfolio.
• If you’re new to investing, check out Is It Too Late to Start Investing in 2026? A Reality Check for Europeans.
• Revisit your joint investment plan annually and after major life changes.

Disclaimer: This article is for educational purposes only and does not constitute financial advice. Always do your own research and consider consulting a qualified financial advisor before making investment decisions.