The Smart Way to Rebalance Your ETF Portfolio: How Often and When?

Building a low-cost, diversified ETF portfolio is a great start, but keeping your investments on track is just as important. Rebalancing ensures your portfolio matches your risk tolerance, especially as markets move. In this article, we’ll dive deep into how, when, and how often to rebalance your ETF portfolio in Europe—covering practical steps, tax considerations, and platform-specific tips. For a broader overview on constructing your portfolio, see our Complete 2026 Guide to Building a Low-Cost European ETF Portfolio.

Step 1: Understand Why Rebalancing Matters

When you first set your ETF allocations (e.g., 70% equity, 30% bonds), that mix reflects your risk tolerance and investment goals. Over time, market movements shift these weights—after a stock rally, you might find yourself at 80% equity and 20% bonds, exposing you to more risk than you intended.

• Why it matters: Rebalancing restores your target allocation, keeping risk in check and maintaining discipline.
• What can go wrong: Ignoring rebalancing can lead to a risk profile that no longer fits your needs, potentially resulting in bigger losses during downturns.

Step 2: Choose Your Rebalancing Schedule

There’s no universal “best” frequency, but most European ETF investors use one of these methods:

• Calendar-based: Rebalance once or twice a year (e.g., every June or every January and July)
• Threshold-based: Rebalance whenever an asset class drifts more than a set percentage (e.g., 5%) from its target allocation

Example: If your target is 70% equity, 30% bonds, and equities grow to 76% (6% above target), you would rebalance back to 70/30.

• Why it matters: Calendar-based is simple and predictable; threshold-based can be more responsive to market swings.
• What can go wrong: Rebalancing too frequently can rack up transaction fees and taxes; too infrequently, and your risk profile drifts.

Step 3: Calculate Your Current Allocation

Before you can rebalance, you need to know your current breakdown. Here’s how to do it:

1. Log in to your broker (e.g., DEGIRO, Interactive Brokers, or Trade Republic).
2. Export your portfolio data or note down current market values for each ETF.
3. Add up the total value of your portfolio (e.g., €12,000 total: €8,400 equity ETF, €3,600 bond ETF).
4. Calculate each fund’s percentage: (€8,400/€12,000) × 100 = 70% equity, (€3,600/€12,000) × 100 = 30% bonds.

• Why it matters: Accurate numbers are essential—guessing leads to mistakes.
• What can go wrong: Forgetting to include cash or new deposits can skew your percentages.

Step 4: Compare to Your Target and Identify Needed Trades

Now, compare your current allocation to your target. Let’s say your plan is 60% equity, 40% bonds, but you’re at 70% equity, 30% bonds.

• To rebalance, you’ll need to sell some equity ETF and buy more bond ETF.
• Example: With €10,000 total, 70% in equity (€7,000), 30% in bonds (€3,000). Target should be €6,000 equity, €4,000 bonds. Sell €1,000 of equity ETF and buy €1,000 of bond ETF.

• Why it matters: Rebalancing can involve selling winners and buying underperformers—counterintuitive, but crucial for risk control.
• What can go wrong: Failing to act when allocations are off leads to unintended risk. Over-trading can generate unnecessary costs.

Step 5: Execute Rebalancing on Your Broker

Specific steps vary by platform:

• DEGIRO: Go to ‘Portfolio’, select the ETF to sell, click ‘Sell’, specify amount. Then, select the ETF to buy, click ‘Buy’, enter amount. Confirm both trades.
• Interactive Brokers: In ‘Portfolio’, right-click the ETF, choose ‘Close Position’ or enter a sell order. Buy the new allocation via ‘Trade’ → ‘Buy’.
• Trade Republic: Tap ‘Portfolio’, select ETF, tap ‘Sell’, confirm. Then, tap ‘Buy’ for the new ETF. For savings plans, adjust the monthly contribution amounts under ‘Savings Plan’.

After making the trades, your portfolio should closely match your target allocation.

• Why it matters: Timely execution ensures your rebalancing is based on up-to-date prices.
• What can go wrong: Delays between selling and buying can expose you to market swings (“cash drag”).

Step 6: Understand Tax Implications in Europe

Unlike in the US, most European investors invest in taxable accounts (unless using special wrappers like PEA in France or ISA in the UK). Selling ETFs to rebalance can trigger capital gains tax.

• Why it matters: Taxes can eat into returns. In Germany, for example, capital gains above €1,000/year are taxed at 25% plus solidarity surcharge and church tax.
• What can go wrong: Frequent rebalancing increases taxable events. Ignoring tax can mean a surprise bill.

To limit tax impact:

• Prioritise using new contributions or dividends for rebalancing
• Consider rebalancing within tax-advantaged accounts if available
• Track your realised gains each year

Step 7: Automate Where Possible (or Set Reminders)

Most European brokers don’t offer fully automatic rebalancing for ETF portfolios, but you can automate contributions and set recurring reminders.

• Trade Republic: Set up or adjust monthly savings plans for each ETF. Tap ‘Savings Plan’, select your ETF, and enter the new monthly amount. This keeps your portfolio close to target over time.
• DEGIRO/Interactive Brokers: Create calendar reminders (e.g., every June and December) to review and manually rebalance.

• Why it matters: Automation reduces the mental load and ensures discipline.
• What can go wrong: Neglecting reviews can let your portfolio drift; over-automation may not account for life changes or cash flows.

Common Mistakes

• Rebalancing too often: Chasing every small drift increases costs and taxes. Stick to a schedule or reasonable threshold.
• Ignoring transaction fees: Some brokers (especially legacy banks) charge €5–€10 per trade. Low-cost brokers like Trade Republic (€1 per trade) or DEGIRO (often €2) are preferable. Compare platforms—see our ETF Investing Showdown for details.
• Not including cash or new deposits: Always include all portfolio assets in your calculations.
• Forgetting tax impact: Plan rebalancing to minimise taxable events. Learn from others' errors—see 5 Common ETF Portfolio Mistakes.

Next Steps

• Set your rebalancing schedule now—annual, semi-annual, or threshold-based
• Review your broker’s transaction fees and tax reporting tools
• Consider reading our Step-by-Step Guide to Rebalancing European ETF Portfolios for more in-depth walkthroughs
• Want to optimise your ETF selection? Explore ETF Portfolio Models: Simple One-Fund vs. Three-Fund Strategies

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.