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How to Increase Your Investment Contribution When Your Income Rises
Key takeaways
- Every income increase is an opportunity to raise your investment contribution — ideally right away, before you get used to higher spending.
- First check that your emergency fund is adequate, then direct the raise into investments.
- Increasing DCA by even 500–1,000 CZK per month has a very significant impact over 20 years due to compounding.
- Invest new money preferentially into underweighted asset classes — you rebalance without having to sell anything.
- Don't forget the tax framework: for long-term investing, the three-year holding period applies for tax exemption.
A raise is the best moment to increase your investment contribution — because your lifestyle hasn't yet adjusted to the higher income. Economists call this "lifestyle creep" and it is the silent enemy of every investor.
Why act immediately
If you wait, you will adapt your spending to the new income, and in 3 months you will feel like the money is "barely enough" again. A better strategy: immediately after a pay raise, set up a standing order for 50–70% of the net increase to go straight to investments. The rest can go to spending or reserves.
Step-by-step process for increasing contributions
- Step 1: Check your emergency fund. It should cover 3–6 months of expenses. If it doesn't, top it up first.
- Step 2: Decide how much of the raise goes to investments. The 50% rule works as a starting point.
- Step 3: Increase the standing order to your brokerage account — ideally on the same day the new salary kicks in.
- Step 4: Invest the new money into underweighted funds in your portfolio, not blindly into the same fund as before.
New money as a rebalancing opportunity
Adding to underweighted portfolio components is smarter than buying more of what is already rising. If your target is 80% equities / 20% bonds and equities have grown to 88%, direct the new money to the bond portion. You rebalance without tax consequences from selling. How to build and maintain a portfolio is described in how to build your first portfolio.
Tax framework
In the Czech Republic, income from the sale of ETFs is exempt from tax if you held the fund for more than 3 years (the time test). New investments should therefore be planned with the understanding that the first 3 years are "locked" from a tax perspective. This confirms the advantage of a long-term approach. Details on ETF taxes in the Czech Republic are in a dedicated article.
FAQ
How much of a raise should I invest?
The 50% net increase rule works as a starting point. The rest goes to spending or reserves. The key is setting up an automatic transfer immediately — before lifestyle creep kicks in.
Should I add to my existing fund or buy a new one?
Preferentially invest in underweighted components of your existing portfolio. Buying an underweighted asset class rebalances your portfolio without requiring any sales, and therefore without tax consequences.
What is lifestyle creep and how do I prevent it?
Lifestyle creep is the natural increase in spending after an income rise — a new car, a larger apartment, more expensive holidays. You prevent it by setting up the new standing order before you spend the first higher paycheck.