Taxing single men: a proposal that reopens fiscal debate

Taxing singles to curb declining birth rates

A tweet attributed to US user Jessica Pin proposes an extra tax on men who are still single at 30, with the revenue to fund economic incentives for married couples with children. The idea is presented as a remedy for the demographic winter and has circulated for months in public debate in Spanish, reopening an uncomfortable question: can low birth rates be corrected by the Tax Code or by something no law can reach?

What the proposal is and where the idea comes from

The concept is not new. It is inspired by the Lex Flavia and Lex Pappia Poppaea laws, approved by Emperor Augustus about 2,025 years ago to encourage marriage and birth rates among the Roman patrician class. Rome had a problem similar to today's: men of elite status pursuing political and military careers preferred concubines to founding stable families.

Those laws granted tax advantages to those who married, but the patricians found loopholes. Fictitious adoptions were used to comply formally without actually marrying, a mechanism explaining why so many emperors were adopted sons of their predecessors. The diagnosis of the current proposal repeats the pattern: dignify the role of the family man and penalize those who do not assume it. The novelty lies in the instrument, not the intention.

Why elite birth rates are also falling without sensual liberation

The most repeated argument against the proposal points to women and hypergamy, understood as the tendency to pair with someone of higher status or resources. It is argued that a small group of men monopolizes relationship opportunities —it is even claimed that 200 men compete for every available single woman— which discourages marriage for the rest. Another formulation of the same diagnosis suggests that 80% of men have little access to relationships while the remaining 20% monopolize the opportunities.

Refutation comes with data. In countries without sensual liberation or legal concessions for women, such as Egypt, India, or Nigeria, elite birth rates are also below replacement level, while the general population's birth rate exceeds it comfortably. If the problem were solely female liberation, the pattern would not be repeated in such different contexts. The debate gets stuck there.

What has already been tried: Poland, Hungary, and personal income tax for parents

Incentive policies are not laboratory hypotheses. Poland has eliminated personal income tax for parents with two or more children in a significant tax reform, presented as an explicit commitment to the family. In Hungary, the effect was real but limited: birth rates rose but did not fully compensate for the decline, and the bulk of the improvement was concentrated among those who already intended to have children.

Spain is not starting from scratch. A single person without children already faces different treatment in personal income tax and, in the workplace, does not have access to parental leave or even the occasional days off granted for childcare. That differential already exists; the question is how much further it can be pushed without causing perverse effects.

The problem with any selective tax: the loophole

Any fiscal penalty based on personal circumstances invites the simulation of the opposite circumstance. In Rome, it was adoptions; today, the catalog is broader and cheaper. The focus is on convenient marriages between friends to share tax deductions, on registration changes, and, above all, on simple evasion by those who have nothing to lose.

There is a second problem: equity. The person who decides whether to marry or have children is not necessarily the one paying the tax. Taxing those who do not choose their situation punishes the symptom while leaving the cause intact, which usually lies in the labor market, housing costs, and income uncertainty.

Proposals going in the opposite direction

Variants of the same idea emerge. One current of thought advocates taxing women over 30 without children as well, for consistency with equality. Another goes further and proposes marriage obligations for younger women, with the idea of providing wealthy men with a powerful incentive to marry. The range of possible measures has expanded into territories that no democracy would approve.

Meanwhile, the most pragmatic objection is not sarracena but arithmetic: raising taxes reduces disposable income precisely in the age group one wants to encourage to start a family. Less money in the pocket means less room to consider having a child.

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And yet, the figure that closes the circle is unsettling: a good portion of the men who would fall into the taxed category do not renounce marriage out of preference or calculation. If supply is concentrated and competition is distributed, the tax will ultimately fall on those least able to decide. With these elements, the diagnosis of the demographic winter will continue to point to the wrong party in the contract.