Spousal tax splitting on the brink? Klingbeil’s reform plans and what’s really behind them

It’s a tax model that has stood like a fortress for decades – but now it’s seriously under threat. Lars Klingbeil, the heavyweight from the SPD, has an idea that’s making many married couples sit up and take notice: he wants to abolish spousal tax splitting. Or at least overhaul it so it no longer fits with today’s world. I remember debates years ago when this topic was still treated as something of a taboo. Back then, people would say: "This is untouchable." Today, when the government has to watch every cent, things suddenly look different.

Why Klingbeil has spousal tax splitting in his sights

The reasoning Klingbeil gives is simple – but it gets to the heart of the matter. This model, where married couples are taxed jointly and the tax burden is blended together, comes from an era when women usually stayed at home and the man was the sole breadwinner. Today, frankly, it’s an anachronism. If you look closely, it becomes clear: Spousal tax splitting doesn’t actually support families; it supports a specific role model. It offers a huge advantage to couples with a large income disparity – and in the vast majority of cases, that’s still the classic setup where the woman earns less or doesn’t work at all.

Within the SPD, there’s a growing belief that this model is a real roadblock to equality. And the numbers back them up. I looked at one of the major studies on this a while back, conducted by a reputable economic research institute. The findings are clear: if spousal tax splitting were abolished, women’s participation in the workforce would increase by an average of up to eight per cent. These aren’t just pie-in-the-sky figures; they’re tangible effects. Suddenly, it would no longer be worth it for many couples to have one partner stay at home just to pocket the tax advantage.

What this means for the birth rate – the opposite of what you’d expect

Now here’s what’s really surprising. Supporters of the splitting model always say: "This is the backbone of the family; it secures having children." But the reality paints a different picture. A study I read in a specialist journal a while back proved the exact opposite. When the government stops rewarding unequal income distribution and instead invests in childcare options and genuine freedom of choice, the birth rate goes up. It sounds paradoxical, but it actually makes sense: couples are more likely to feel they can have children if they know they can both work without being penalised by the tax system.

So the current debate about reforming spousal tax splitting is no longer purely about finances. It boils down to this: does the government want to promote the traditional breadwinner marriage, or does it want to support modern ways of living? I think many younger couples no longer have that traditional image in their heads. They’re asking: why should I be at a tax disadvantage just because we both work full-time and send our children to daycare?

• Fact 1: Spousal tax splitting costs the government billions in lost tax revenue every year.
• Fact 2: It only benefits couples with large income differences – often those who least need the help.
• Fact 3: Countries like Sweden or France have entirely different models that boost both the birth rate and female workforce participation.

The grand coalition of the Union and SPD? A stumbling block named FDP

But this isn’t going to happen overnight. The party members know that, too. Because while Klingbeil is gaining more support within the SPD, it’s a very different story with the Union. For the CSU, spousal tax splitting is practically sacred. But even if a future government could find common ground, the FDP is waiting in the wings. The liberals have already declared this model a non-negotiable core issue. For them, the tax incentive for marriage is a cornerstone of their economic policy. I’d be surprised if such a bill made it through the Bundesrat without a major fight.

But let’s be clear about one thing: simply abolishing it without any offsetting measures would be a disaster. If you scrap the splitting system, you have to introduce other relief. Otherwise, the middle of society would be the loser. And that’s exactly what’s being negotiated behind the scenes right now. It’s not about scrapping it for the sake of it, but about a reform that ends up being fairer. Perhaps a family-based splitting system that gives more weight to children. Or a model that recognises actual care work, regardless of marital status.

I’ll tell you this: the debate over spousal tax splitting is going to keep us busy over the coming months. Because it acts like a magnifying glass for what’s being discussed across the country right now: how do we want to live, how do we want to work, and what is that actually worth to the government? Stay tuned – it’s going to be a heated autumn.