Comparing the gross yield displayed by an investment and what actually remains in your pocket after taxes, management fees, and inflation: this is what separates savings that grow from savings that stagnate. Personal finance is not just about putting money aside each month. It is managed by measuring the gap between the announced yield and the net yield received, then adjusting your investments accordingly.
Gross yield and net yield: the real gap according to investment types
The gross yield of an investment says almost nothing about its actual performance. Entry fees, annual management fees, social contributions, and income tax erode the displayed performance. On a traditional savings account, the gap remains small because the rate is already low. On a life insurance policy with unit-linked accounts or a PEA, the gap can represent several dozen basis points.
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| Investment Type | Indicative Gross Yield | Main Taxes / Fees | Approximate Net Yield |
|---|---|---|---|
| Livret A / LDDS | Regulated rate | Exempt from tax and social contributions | Identical to gross |
| Euro funds (life insurance) | Higher than the regulated savings account | Annual management fees, social contributions, reduced taxation after 8 years | Lower by several dozen basis points |
| Unit-linked accounts (life insurance) | Variable, potentially high | Management fees, transaction fees, taxation after 8 years | Highly variable depending on the contract’s fees |
| PEA (stocks / ETFs) | Variable depending on the markets | Exempt from income tax after 5 years, social contributions maintained | Net yield significantly closer to gross after 5 years |
| PER | Variable (euro funds + UC) | Contributions deductible from taxable income, taxation upon withdrawal | Net gain related to tax savings at entry |
This table highlights a point often overlooked: the holding period radically changes the net yield. On a life insurance policy, surpassing the eight-year mark reduces the applicable tax on withdrawals. On a PEA, five years is enough to eliminate income tax.
Before choosing an investment, it is better to simulate the actual net gain. To refine these estimates, the yield calculation with Monsieur Crédit allows you to compare several scenarios while taking into account the fees and taxes specific to each investment type.
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Life insurance and PER: two tax logics not to be confused
Life insurance and the PER are among the most commonly used investment types in France to optimize wealth. However, their tax mechanics are opposed, and confusing them means losing part of the expected benefit.
Life insurance: reduced taxation upon withdrawal
Life insurance combines euro funds (guaranteed capital, moderate yield) and unit-linked accounts (potentially higher yield, non-guaranteed capital). The combination of the two allows for adjusting the risk/return balance.
The main tax advantage comes after eight years of holding: an annual allowance applies to gains upon withdrawal. Before eight years, the taxation remains that of the flat tax, which reduces the appeal of the investment for a short-term horizon.
PER: tax deduction at entry, taxation upon withdrawal
The Retirement Savings Plan works in the opposite way. Voluntary contributions are deductible from taxable income in the year of contribution, generating immediate tax savings. However, the capital (and not just the gains) will be taxed at the time of withdrawal, usually at retirement.
- A taxpayer in a high marginal rate benefits more from the deduction at entry on a PER, provided their rate is lower at retirement.
- A low-taxpayer has more interest in prioritizing life insurance, where the taxation upon withdrawal remains lighter without rate conditions.
- Combining both investment types allows for smoothing the tax risk over the entire working life and retirement.
A common trap is to maximize PER contributions without anticipating the future marginal rate. If the rate remains the same at retirement, the tax gain is almost zero.
Budget and automated savings: structuring cash flows before seeking yield
No yield compensates for poor budget management. Before allocating money between savings accounts, life insurance, and PEA, it is essential to know precisely your net income, fixed expenses, and monthly savings capacity.
The so-called 50/30/20 rule (half of net salary for fixed expenses, one-third for variable expenses, the rest for savings) remains a useful benchmark, but it does not suit all income levels. For a modest salary, the share of fixed expenses often exceeds half. Adapting the proportions to one’s actual situation takes precedence over mechanically applying a formula.
Rounding savings and automatic transfers
In recent years, several neobanks and French fintechs (Revolut, BoursoBank, Fortuneo, among others) have offered rounding features to the nearest euro on each expense. The difference is automatically placed in a savings account. This mechanism increases the savings rate without conscious effort.
Additionally, programming an automatic transfer on payday to a precautionary savings account, then to a long-term envelope (life insurance or PEA), eliminates the procrastination bias. Automated savings remove the temptation to delay the transfer.
Prioritizing savings layers to protect overall yield
Recent guides on wealth management emphasize a principle of layering, each with a distinct objective.
- Precautionary savings: liquid and immediately accessible (Livret A, LDDS). It covers several months of current expenses and is not intended to generate yield.
- Medium-term project savings: euro funds on life insurance or boosted rate savings accounts. The goal is to preserve capital while achieving a yield slightly above inflation.
- Long-term savings: PEA, unit-linked accounts, real estate (SCPI or direct investment). The potential yield is higher, but the capital remains exposed to market fluctuations.
Placing all savings in a regulated savings account protects the capital, but the net yield after inflation remains close to zero, or even negative in some years. Conversely, investing without a precautionary cushion exposes you to the risk of having to sell an asset at a loss in case of unexpected expenses.
The balance between these layers depends on the amount of wealth, investment horizon, and risk tolerance. A well-structured budget, chosen rather than endured taxation, and automated transfers to the right investment types form the foundation of truly optimized financial yield.