Fixed Income vs. Variable Income: Where Your Money Earns More?
Have you ever found yourself looking at investment options and thinking: “Am I leaving money on the table by staying only in savings?” Or, conversely, were you afraid to put everything in stocks and see your wealth plummet? This doubt is more common than it seems — and the honest answer is: it depends on your profile, your goals, and the economic moment. There is no single answer that works for everyone.
In this article, we will explain clearly and objectively what differentiates fixed income from variable income, what are the advantages and risks of each, and how to think about your portfolio composition consciously. The goal is not to indicate “where you should put your money,” but rather to give you the tools to make more informed decisions.
An important caveat before we start: all investments involve risk, even those considered safer. Past returns are not a guarantee of future returns. With that in mind, let’s get to it.
What Is Fixed Income?
The fixed income is a category of investments in which the remuneration rules are defined at the time of application — or at least the criterion for calculating the return is known in advance. This does not mean that the return is always a fixed number; it means that you know how it will be calculated.
There are three main types of remuneration in fixed income:
- Pre-fixed: the interest rate is set at the time of application (e.g., “X% per year”). You know exactly how much you will receive if you keep the investment until maturity.
- Post-fixed: the return follows a reference index, such as the Selic rate or the CDI (Interbank Deposit Certificate). Since these indices change over time, the final return is only known at maturity.
- Hybrid: combines a pre-fixed rate with an inflation indexer, such as the IPCA. Very common in IPCA+ Treasury titles.
Common fixed income examples
- Treasury Direct: a program of the federal government that allows individuals to purchase government securities. Current information and rates are available on the Treasury Direct official website.
- CDB (Certificado de Depósito Bancário): issued by banks, generally remunerated a percentage of CDI.
- LCI and LCA (Mortgage Credit Letters and Agribusiness Credit Letters): exempt from income tax for individuals, which can be an advantage depending on the term and rate.
- Debentures: securities issued by companies. Incentive debentures (infrastructure) are also exempt from income tax for individuals.
- Savings: the most well-known of all, but not always the most advantageous. Its return follows rules set by the Central Bank and is available on the Central Bank of Brazil website.
Advantages and risks of fixed income
| Aspect | Advantages | Risks/Disadvantages |
|---|---|---|
| Predictability | Known remuneration rules | May lose to inflation in adverse scenarios |
| FGC Protection | CDB, LCI, LCA have coverage up to R$ 250,000 per CPF/institution by FGC | Limit per institution; government securities have no FGC |
| Liquidity | Many products with daily redemption | Early redemption may imply losses (mark-to-market) |
| Taxation | Some products are exempt from income tax | Others follow the regressive income tax table (22.5% to 15%) |
Attention regarding income tax on fixed income: most fixed income products subject to tax follow the regressive income tax table, which starts at 22.5% for applications up to 180 days and falls to 15% for applications above 720 days. To find out the exact and updated ranges, consult the Federal Revenue website.
What Is Variable Income?
The variable income comprises investments whose return is unpredictable and not guaranteed. The value can go up, down, or even go to zero depending on the performance of the asset. Greater return potential usually comes with greater volatility and risk.
Common variable income examples
- Stocks: represent a fraction of a company’s capital. By buying stocks, you become a partner and participate in profits (dividends) and losses. Traded on B3, the Brazilian stock exchange.
- Stock investment funds (FIA): pool resources from various investors to invest in stocks, with professional management.
- FIIs (Real Estate Investment Funds): invest in real estate or real estate securities and distribute returns monthly. Also traded on B3.
- ETFs (Exchange Traded Funds): funds that replicate indices (such as the Ibovespa) and are traded on the stock exchange.
- BDRs (Brazilian Depositary Receipts): certificates representing shares of foreign companies traded in Brazil.
- Crypto assets: highly volatile, without consolidated regulation like the other classes, and with specific risks that deserve extra attention.
Advantages and risks of variable income
| Aspect | Advantages | Risks/Disadvantages |
|---|---|---|
| Return potential | Historically, stocks outpaced inflation over the long term | Can lose significant value in the short term |
| Diversification | Allows exposure to varied sectors and markets | Risk of concentration in a few assets |
| Liquidity | Stocks and ETFs have high liquidity on the exchange | Selling price depends on the market at the time |
| Taxation | Income tax exemption on stock sales below R$ 20,000/month (for individuals) | Operations above that limit are taxed; day trading has a different rate |
Regarding the taxation of stocks: monthly sales of stocks below R$ 20,000.00 per individual are exempt from income tax. Above that, a rate of 15% applies to the profit (normal operations) or 20% (day trading). Rules for FIIs and ETFs have their own specificities. Always consult the Federal Revenue or an accountant to confirm current rules.
How to Compare Returns Fairly?
A common pitfall is to compare products without considering net return — that is, after deducting taxes, management and custody fees, and inflation.
To compare more fairly:
- Deduct the income tax from the taxable product.
- Check management and custody fees (common in funds and Treasury Direct).
- Compare with inflation for the period: an investment that returns 10% per year with 8% inflation delivers only 2% of real gain.
- Consider the timeframe: long-term and short-term products have different risk profiles and taxation.
- Observe liquidity: how long would it take to withdraw the money if you need it?
The Selic rate and CDI are important benchmarks for evaluating post-fixed fixed income. To find out the current values, visit the Central Bank of Brazil website (bcb.gov.br), which publishes these rates in an updated and official manner.
Investor Profile: The Starting Point
Before choosing any product, it is essential to understand your investor profile. In Brazil, financial institutions are required by the CVM (Securities Commission) to apply the Suitability questionnaire (suitability), which classifies investors into profiles such as conservative, moderate, and aggressive.
- Conservative: prioritizes safety and liquidity, accepts lower returns to avoid losses.
- Moderate: accepts some volatility in exchange for potentially higher returns, but still seeks balance.
- Aggressive (or risk-taker): tolerates significant fluctuations and aims for higher returns in the long term.
There is no “right” or “wrong” profile. What matters is that your investment portfolio is consistent with your financial reality, your goals, and your time horizon.
Diversification: The Most Honest Strategy
It is rare for anyone to consistently predict which asset class will perform best in the next year. That is why diversification is widely recognized as one of the most effective tools for managing risk — not to eliminate it, but to spread it.
In practice, this means distributing resources among different types of investments, timeframes, and indexers. A diversified portfolio can include, for example:
- An emergency reserve in a high-liquidity, low-risk product (such as Treasury Selic or daily-liquidity CDB).
- A portion in medium and long-term fixed income for specific goals.
- A portion in variable income for those with a longer time horizon and volatility tolerance.
For those who want to better understand how to organize their finances before investing — especially those who still have debts — it is worth reading the article How to Get Out of Overdraft and Revolving Credit, which addresses practical strategies for balancing your budget.
Before Investing: Essential Checklist
- Pay off high-interest debts before investing — no traditional investment makes up for credit card revolving rates or overdraft charges.
- Build an emergency fund equivalent to 3 to 6 months of expenses, in a product with daily liquidity.
- Define your goals (short, medium, and long term) and the timeframe for each.
- Complete the suitability questionnaire at a broker or regulated bank.
- Compare products by net return, not gross return.
- Diversify according to your profile and goals.
- Review regularly your portfolio — what makes sense today may not make sense in one or two years.
Conclusion: There Is No Single Answer, There Is the Right Answer for You
The question “fixed income or variable income?” rarely has an absolute answer. What exists are choices more or less adequate to each moment in life, financial goal, and risk tolerance. Someone who is just starting to invest and still does not have an emergency fund should not be in highly volatile variable income. Someone with a 20-year horizon and an aggressive profile can benefit from greater exposure to stocks — but without ignoring the risks.
Financial knowledge is, in itself, one of the best investments you can make. The more you understand about how products work, how taxation applies, and what the real risks involved are, the better prepared you will be to make conscious decisions — and to recognize when it is time to seek professional help.
To deepen your financial education and understand tools that can facilitate access to your financial information, also check out the article Open Finance: What It Is and How It Can Help You.
> Educational Note: This article is for educational and informational purposes only. It does not constitute investment recommendation, financial advice, or indication of specific products. Tax data, rates, and rules mentioned should be verified in official sources (Central Bank, Federal Revenue, Treasury Direct, CVM, and B3), as they are subject to change. For investment decisions appropriate to your profile and financial situation, consult a certified professional or investment advisor duly registered with the CVM.
