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Q4 2027 Portfolio Review: Rebalancing, Taxes, and Goals for Next Year

6 min readCompound

Key takeaways

The quarterly portfolio review in October is not just administration — it is the most important investment meeting of the year, because it combines allocation, taxes, and planning into one window that will not repeat before year-end.

Step 1: Check Allocation

Look at your current portfolio breakdown and compare it with your target plan. A common rule: if a component's weight has drifted by more than 5 percentage points, it is time to rebalance. The cheapest approach is to redirect new contributions to the underweighted component — no selling, no tax event. If that is not sufficient, proceed to sell the overweighted component.

Step 2: Tax Window

Q4 golden rule: Make tax decisions based on investment logic, not the other way around. If a position is fundamentally sound, don't crystallise a loss just to save on taxes.

Step 3: Goals for 2028

Good goals are specific: "I invest CZK 3,000 per month via DCA into a global ETF and rebalance once a year" is a goal. "I want to invest more" is not. Write down: your monthly investment amount, your target allocation, the date of your next review, and any new products or themes you want to explore. How to build a portfolio from scratch is covered in the first portfolio guide. Tax aspects of ETFs are explained in ETF taxation in the Czech Republic.

This article does not constitute investment advice.

FAQ

How often should you rebalance your portfolio?

For most long-term investors, once a year — in Q4 — is sufficient. More frequent rebalancing increases transaction costs and tax events without a commensurate benefit. The exception is a large market move that significantly distorts your allocation.

What are the tax deductions for investments in the Czech Republic?

In the Czech Republic, contributions to DIP and pension savings can be deducted from personal income tax up to the statutory limits. Losses from selling securities reduce the tax base in the same tax year. Always check the details with a tax advisor.

What should I set as an investment goal for next year?

A concrete goal: the monthly investment amount (in CZK), the target allocation (% equities/bonds/cash), the date of the next review, and at most one new product or topic to explore. Write it all down — goals that are not written down do not get done.

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