Taxation of Savings: an "incentive to patience" to discourage excessive capital turnover

Taxation creates a structural incentive that should encourage investors to avoid excessive portfolio turnover, preserving capital and allowing time to do its work.

by Giuseppe Anfuso

In Italy interest, dividends and many capital gains are often taxed at a flat 26%, while personal income tax on work reaches 43% in the top bracket. The comparison seems to end there. In reality, when return after tax is measured over years rather than “in snapshot form”, stamp duty, inflation and the frequency with which gains are realised come into play. It is in that passage, from gross to real net, that the tax burden on capital can rise above the 43% threshold and compress the growth of wealth more than the headline rates would suggest.

Why the 26% vs 43% comparison is misleading - The 43% personal income tax rate is a marginal tax rate: it applies only to the last slice of income above a threshold, not to the entire salary. Many taxpayers, even on medium-high incomes, experience an average tax rate that is significantly lower than the marginal one. The 26% on capital income, by contrast, often operates as a separate levy on each individual flow: every coupon, every interest payment, every realised capital gain is taxed in a flat way, with no brackets and no progressivity to soften the impact on smaller amounts. This difference in tax architecture explains why the two numbers are not directly comparable: putting 26 and 43 on the same level produces an aesthetic comparison, not an economic one.

Therefore, the useful question for a sophisticated saver is not “what is the tax rate?”, but rather “how much performance remains after taxes, recurring costs and inflation?”. In other words, the object of comparison is not the percentage printed in the law, but the return that truly enters the accumulation process. There is also a psychological aspect that matters: at work, taxation is perceived as a levy on income, while on savings it is often seen as a small withholding “on return”. In practice, however, that apparent “small withholding” can become the factor that determines whether an investment plan reaches its real objectives or not.

How taxes and charges erode compound growth - The tax cost of savings emerges above all over time, because it strikes the engine of wealth growth: compound interest. A tax paid today matters not only for the amount paid today, but for the future return that that capital will no longer be able to generate. It is a simple concept, but often ignored when reasoning “in terms of rates”. If a portfolio earns 4% gross and is subject to 26% tax, the net return falls to 2.96%. On top of that comes stamp duty on the securities account, typically equal to 0.2% a year on value. The decisive feature of stamp duty is that it is not tied to the year’s outcome: it is a cost that runs even when return slows and that, in effect, acts as a “tax on time” applied to invested capital.

When returns are moderate, that 0.2% becomes a multiplier of the tax burden. A concrete example: on 50,000 euros yielding 2% (1,000 euros gross), the 26% tax cuts the flow to 740 euros; stamp duty takes another 100 euros. 640 euros remain. In that case, the overall “visible” levy reaches 36% of return. If the gross return falls to 1%, the effect becomes even more pronounced: stamp duty weighs as much as a large fraction of return and the overall impact can approach or exceed thresholds that, in public debate, are associated only with the highest personal income tax rate.

In a context like this, without alarmism, it is worth reading the mechanism correctly: the tax on the flow (26%) and the tax on the stock (stamp duty) add up on different bases and, together, change the speed at which wealth grows: a portfolio that “survives” on a gross basis can become mediocre on a net basis; a mediocre gross portfolio risks becoming irrelevant on a net basis.

Inflation and the nominal base: when the tax remains full and real return is hollowed out - Inflation introduces another cognitive distortion for the saver: many taxes on savings hit nominal return, while the investor lives in the world of real return. If prices rise, part of nominal return is needed simply to avoid falling behind in purchasing power. Taxation, however, does not automatically distinguish between “gain” and “inflation recovery”, because it continues to be calculated on the nominal figure. It is at this point that the effective tax rate on real return can surge. If, for example, an investment produces a nominal return close to the inflation rate, the real gain narrows, but the tax on the nominal amount remains almost unchanged. The practical consequence is that a growing share of real return is absorbed, up to the paradox of real returns close to zero with taxes still paid.

A similar point applies to capital gains: the taxable base is the difference between the sale price and the purchase price. In inflationary settings, part of the increase may be purely “monetary”, yet it is taxed in the same way. The investor sees a positive number in the capital account, the tax authority sees a taxable capital gain, but the purchasing power gained may be far lower than the nominal figure suggests. This step is central to advanced financial education: it is not enough to look at net return “in euros”; one must ask how much that return truly adds in terms of future spending capacity.

Dividends and realised gains: when 26% becomes more than a single layer - The dividend is the most instructive case because it shows the layering of the levy. The flow distributed to the shareholder arises from company profits that have already been taxed at the corporate level; then, when the shareholder receives it, the 26% withholding tax kicks in. If one measures the burden on the original profit that generates that dividend, the overall taxation can reach around - and in some cases above - the 43% threshold. It is a dynamic that surprises those who look only at the final withholding, but it becomes obvious as soon as the analysis shifts from the “coupon collected” to the “profit that makes it possible”.

Added to this is a variable that is often overlooked: the frequency of realisations. A portfolio that turns over frequently pays taxes more often and more abruptly. Paying earlier means reducing the invested capital sooner and, as a result, reducing the base that can compound in subsequent years. For an evolved investor the point is not to demonise trading, but to recognise its implicit tax cost: for the same gross return, the high-turnover portfolio tends to have a lower after tax return, because it brings forward the levy and reduces the compounding effect. In practice, taxation creates a structural incentive to patience: not because it is always and necessarily “better”, but because deferring realisation, when consistent with the strategy, preserves capital and allows time to work.

Personal income tax 2026 and unchanged savings: why the comparison becomes even subtler - The changes to the personal income tax brackets for 2026 ease some bands, but do not change the structure of taxation on financial returns, which remains anchored at 26% for many categories of capital income. This makes the comparison even more delicate: many taxpayers may find themselves with a marginal tax rate on work below 43%, while savings continue to be taxed in a linear way and are hit by wealth-related charges and inflation- and realisation-timing-related penalties. In this scenario, the idea that savings are “always and in any case” fiscally favoured over work becomes an oversimplification. It may be true for some combinations of instruments, returns and time horizons; it may be false for others, especially when gross returns are not high or when the strategy involves frequent realisations.

The point for investors: plan on real net, not narrative gross - For those engaged in advanced financial planning, the rule is not to look at the single rate, but to build decisions on real net. That means assuming that the substitute tax and stamp duty are not “administrative details”, but variables that affect the wealth trajectory. It also means accepting that inflation and taxation interact: when inflation rises, real return falls, and nominal taxation weighs relatively more. The sophisticated saver, therefore, measures investment success in terms of goals: supplementary pension, financial freedom, protection of family capital. From this perspective, the issue is not to establish whether savings pay “more” or “less” than work in the abstract, but to understand when and why the tax system reduces compound growth to the point of making a merely seemingly satisfactory return insufficient.