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How to Close the Investment Year with Calm: A Guide to the December Portfolio Review
Key takeaways
- Year-end is a time for reflection, not impulsive portfolio changes.
- Rebalancing makes sense only if allocation has drifted significantly from target — not as a routine December ritual.
- Measure progress against your own plan, not against a market benchmark you cannot control.
- Tax optimisation — such as selling loss-making positions before year-end — has its place, but is worth discussing with a tax adviser.
- December is a good time to write down what you learned as an investor this year.
December brings, alongside the winter holidays, a flood of "tips for next year," best-fund rankings, and analyst predictions. Most of this is noise. Truly useful year-end work looks different — calm, systematic, and free of emotion.
Review First, Act Second
The first step is a simple overview: how much is invested, what is the current value, how far are you from your goal. Not a comparison with the S&P 500, not a comparison with a neighbour. A comparison with your own plan.
If you do not have your investment plan written down with specific goals and a time horizon, December is the ideal time to write one — that is more valuable than any rebalancing.
When to Rebalance and When Not To
Rebalancing is worthwhile when your current allocation has drifted significantly from the target — usually by more than 5 percentage points in major asset classes. If you target 80% equities and 20% bonds and currently hold 85% and 15%, rebalancing is worth considering.
If the deviation is small, the cheapest and simplest approach is to reinvest new contributions into the underweight component without selling existing positions.
Tax Windows Before Year-End
Year-end is the only window when it makes sense to consider selling loss-making positions to offset gains for tax purposes — in countries where legislation permits this. In the Czech context the situation is specific — always consult a tax adviser, as the rules change.
An overview of ETF taxation in the Czech Republic can be found in the article on ETF tax in the CR.
Recording Lessons Learned
One of the most valuable investor habits is a December "investment diary": what you did well, where you gave in to emotions, what you would do differently next year. Without self-criticism, without self-flagellation. Just data and lessons.
- Did you sell in panic during a downturn? Write it down and identify the trigger.
- Did you miss a regular contribution? Why — was it intentional, or a lapse of habit?
- Did you add a position that unintentionally increased portfolio risk?
A comprehensive look at how to think about risk can be found in the article on what risk is and how to measure it.
FAQ
Do I have to rebalance my portfolio every December?
No. Rebalancing only makes sense when there is a significant deviation from the target allocation. Routine annual rebalancing generates unnecessary costs and tax obligations. Reinvest new contributions into underweight positions — it is cheaper.
How should I measure my performance as an investor?
Compare yourself against your own plan and goals, not against market indices. If your goal is to save for retirement, the relevant question is how close you are to it — not whether you beat the S&P 500.
Is year-end a good time to sell ETFs?
It depends. Selling loss-making positions may make tax sense. Selling profitable positions generates tax. If you do not meet the three-year holding test, consult a tax adviser before selling anything.
What if I am afraid that a downturn is coming next year?
Fear of a downturn is part of investing. If your portfolio is set up for your horizon and risk tolerance, there is no reason to change the structure because of a December prediction. A good plan holds through uncomfortable years too.