I’m often asked if there are any downsides to living in Spain, and I give the same response every time: ‘Yes, the tax system.’

Well, at least for the self-employed, aka ‘autonomos’. I’ve worked for myself in both the UK and Spain and the latter’s system is far more brutal.

Many Brits arrive expecting taxes similar to the UK’s. Instead, they discover that running a small business here comes with far more bureaucracy, higher fixed costs and much less flexibility.

While both countries tax profits, Spain’s system feels designed for established businesses rather than freelancers or sole traders just starting out.

Below are my five main reasons why Spain is much more punitive against self-employed workers and businesses than Britain.

1. You pay even if you earn nothing

This is perhaps the biggest shock for British newcomers, and one I’m still angry about.

In the UK, if your income drops to zero, your tax bill largely disappears. National Insurance contributions can also fall dramatically if profits are very low.

In Spain, however, autonomos pay monthly social security contributions regardless of whether they invoice a single euro.

Although recent reforms mean contributions are now linked more closely to income, you are still committed to paying every month simply for being registered as self-employed.

If work dries up for three months, those bills keep arriving.

We’re not talking about €20 a month. In your first year it is discounted to €88 but then goes up to €200, €300, or even more per month.

I have friends working in real estate paying €600 per month, even when they go for several months without making money due to working on commission only.

2. Quarterly tax returns never stop

British sole traders usually file one annual Self Assessment return with HMRC.

Spanish autonomos, meanwhile, live by the calendar.

Every three months comes another round of paperwork: income tax instalments, VAT declarations (where applicable), withholding taxes and other forms depending on your business.

Miss a deadline and fines can follow surprisingly quickly – and without ANY warning.

Many freelancers end up paying an accountant every month simply to stay compliant, adding another unavoidable business expense.

3. Spain taxes your cash flow before you know your annual profit

One of the most frustrating aspects of Spain’s system is paying tax in advance.

Most autonomos must submit quarterly income tax payments based on profits earned during the year, regardless of what happens later.

If business slows dramatically in the final months, you’ve effectively been lending money to the tax office interest-free until your annual return is calculated.

The UK generally takes a simpler approach, with income tax calculated after the tax year based on actual profits, although payments on account can apply to some taxpayers.

4. VAT can become a bureaucratic nightmare

In Britain, many small businesses benefit from a relatively high VAT registration threshold, meaning plenty never need to charge VAT at all.

Spain has no equivalent general threshold.

Once your activity requires VAT registration, declarations become another regular administrative burden, regardless of whether you’re invoicing €500 or €50,000.

There are exemptions for certain professions and situations, but for many freelancers it means more paperwork from day one.

5. The penalties can be brutal

Spain’s tax authorities have a reputation for taking compliance extremely seriously.

Late filings, missing forms or small administrative errors can trigger fines, surcharges or interest.

Many autonomos say they spend as much time worrying about paperwork as they do running their businesses.

By comparison, HMRC is often viewed as more forgiving for first-time mistakes, particularly where taxpayers correct errors voluntarily.

In the UK, when I have missed a deadline, HMRC contacted me and was willing to work something out – they even gave me a discount on what I owed them ‘out of good faith’.

In Spain, when I once did not have enough in my account to cover my monthly €88 autonomo fee, I was automatically fined more than €300.

Is Spain all bad?

Spain’s social security contributions provide access to the public healthcare system and other benefits that many freelancers value.

There are also reduced contribution schemes for new autonomos, and recent reforms have made the system fairer for those on lower incomes.

But ask many British entrepreneurs who have experienced both systems, and they’ll tell you the same thing: the UK makes it easier to start small, while Spain expects you to behave like an established business from the moment you register.

For would-be freelancers dreaming of swapping Britain for the Costa del Sol, it’s worth understanding the rules before taking the plunge.