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Q3 Portfolio Review: Check Your Allocation and Rebalance Through New Contributions

6 min readCompound

Key takeaways

A quarterly portfolio review is not about reacting to market events — it is a calm check to confirm the portfolio still matches your plan.

What exactly to check: a 5-point list

Rebalancing: sell vs. buy more

The most common dilemma: should you sell the overweight asset class, or is it enough to redirect new contributions? For most investors, rebalancing through new contributions is more advantageous:

If new contributions would not be enough to restore the allocation (a large deviation or a large portfolio), selling the appreciated portion is justified — especially if you have satisfied the three-year holding-period test and the capital gains tax is zero.

Tolerance rule: You do not need to rebalance at every deviation. A reasonable tolerance is ±5 percentage points from the target allocation. Rebalancing too frequently reduces returns through transaction costs.

Q3 context: summer as a natural pause

The third quarter is an ideal time for a review: half the year has passed, H1 corporate results are available, and you have an overview of annual income for any optimisations. The output of the review should be a simple note: "Allocation on track / rebalancing X CZK through the next contribution" — and nothing more.

FAQ

How often should I rebalance my portfolio?

For a passive investor, once a quarter or when the allocation deviates by more than 5 percentage points is sufficient. Rebalancing too frequently increases transaction costs and reduces returns.

Is it better to rebalance by selling or by buying more?

For most investors it is more advantageous to redirect new contributions to the underweight asset class. No taxable gain is realised and the portfolio stays fully invested. Selling is appropriate for large deviations or after the holding-period test has been met.

What is the holding-period test in the Czech Republic and how does it affect rebalancing?

In the Czech Republic, income from selling securities held for more than 3 years is exempt from tax (subject to additional conditions). Rebalancing by selling is therefore most advantageous after that test has been satisfied.

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