If you've noticed your monthly Social Security contribution has increased in recent years, you may have come across something called the MEI. But what exactly is it, and does it change anything for freelancers registered as autónomos in Spain?
The short answer is: yes, you pay the MEI—but you don't have to do anything extra. It's automatically included in your monthly Social Security contribution and requires no additional paperwork.
Here's everything you need to know.
TL;DR
- The MEI is an additional Social Security contribution designed to support Spain's public pension system.
- If you're registered as an autónomo, the MEI is already included in your monthly Social Security contribution.
- You don't need to file any additional tax forms or make separate payments.
- The contribution is set by law and may change over time as pension reforms are implemented.
- With Xolo, your Social Security obligations are managed alongside your accounting, so there's nothing extra for you to calculate.
What is the MEI?
The MEI is an additional contribution that helps strengthen Spain's public pension system by increasing Social Security funding.
MEI stands for Mecanismo de Equidad Intergeneracional, or Intergenerational Equity Mechanism. Introduced as part of Spain's pension reforms, its purpose is to generate additional funding today to help cover future pension costs as the population ages.
Unlike income tax (IRPF) or VAT (IVA), the MEI isn't a separate tax you calculate or declare yourself. Instead, it's incorporated directly into your Social Security contributions. For most autónomos, the process is entirely automatic.
Why was the MEI introduced?
The MEI was introduced to help ensure Spain's pension system remains financially sustainable as more people retire. Like many European countries, Spain faces an ageing population. Over the coming decades:
- More people will retire.
- People are expected to live longer.
- Fewer workers will be contributing to the Social Security system relative to the number of pensioners.
The MEI was created to strengthen the pension fund today so it can better support future retirees.
Rather than making large changes all at once, Spain is gradually increasing funding through measures like the MEI.
Do autónomos have to pay the MEI?
Yes. All registered autónomos contribute to the MEI through their monthly Social Security payments.
If you're registered with Seguridad Social as an autónomo, you don't need to choose whether to participate—the contribution is mandatory. The good news is that there's nothing you need to do. You don't need to:
- Register separately
- Calculate the contribution
- File an additional tax form
- Make a separate payment
The MEI is simply included in your regular monthly Social Security contribution.
How much do autónomos pay?
The MEI is calculated as a percentage of your Social Security contribution and is updated according to the pension reform timetable established by law. Rather than paying a fixed monthly fee, the MEI forms part of your overall Social Security contribution.
The exact percentage is established by legislation and has been designed to increase gradually over several years before stabilising. This means the amount you contribute may change over time without you needing to take any action.
Since it's built directly into your monthly cuota, you won't normally need to calculate it yourself.
If you're wondering what your total monthly Social Security costs look like, our guide on How much does it cost to become an autónomo in Spain? explains how contributions are calculated under the current income-based system.
Do I need to file anything because of the MEI?
No. The MEI doesn't create any additional administrative obligations for autónomos.
Unlike quarterly tax returns such as Modelo 303 or Modelo 130, the MEI doesn't require any paperwork. You don't have to:
- Submit forms to the Tax Agency
- Inform Social Security separately
- Include the MEI in your quarterly filings
- Make any additional bank transfers
If you're already meeting your normal Social Security obligations, you're also meeting your MEI obligations.
If you're unsure which forms you do need to file each year, see our guide to Spanish tax forms that apply to you as an autónomo.
MEI vs. the solidarity contribution: What's the difference?
The MEI and the solidarity contribution are two separate measures introduced as part of Spain's pension reform. But because they were introduced around the same period, they're often confused.
Here's the difference:
| MEI | Solidarity contribution |
|---|---|
| Applies to Social Security contributions made by workers and autónomos. | Applies only to employment income above certain contribution limits. |
| Helps strengthen the public pension system. | Introduced to increase contributions from higher earners. |
| Automatically included in your Social Security contribution. | Does not apply to most autónomos in the same way. |
💡 Takeaway: While both measures support Spain's pension reform, they're separate contributions with different rules.
Does the MEI affect my pension?
Indirectly, yes. The MEI is intended to strengthen the long-term sustainability of Spain's public pension system as the additional contributions collected through the MEI help build financial reserves that can be used to support future pension payments.
However, paying the MEI doesn't give you a separate pension benefit or additional entitlement. Instead, it contributes to the overall funding of the public system.
How Xolo helps
The MEI may sound like another layer of bureaucracy, but in practice it's one of the easiest parts of being an autónomo because it's handled automatically.
At Xolo, we help freelancers registered as autónomos stay on top of their administrative obligations—from bookkeeping and quarterly tax filings to ongoing guidance about Social Security and tax compliance.
Whether you're just getting started or already running your business, you'll always know what you need to pay, when you need to pay it, and what has already been taken care of.
Ready to spend less time worrying about paperwork? Join thousands of freelancers using Xolo to manage their autónomo business in Spain.
FAQ
Is the MEI a tax?
No. The MEI is an additional Social Security contribution rather than a separate tax collected by the Spanish Tax Agency.
Do all autónomos pay the MEI?
Yes. Anyone registered as an autónomo contributes through their monthly Social Security payments.
Can I opt out of paying the MEI?
No. The contribution is mandatory for those who are required to make Social Security contributions.
Is the MEI included in my monthly cuota?
Yes. It's automatically incorporated into your monthly Social Security contribution.
Do I have to file any additional forms because of the MEI?
No. There are no separate declarations or tax forms associated with the MEI.
Does the MEI affect my quarterly tax returns?
No. The MEI is unrelated to quarterly tax filings such as Modelo 303 or Modelo 130.
Will the MEI percentage change in the future?
Possibly. The contribution follows the timetable established by Spain's pension reforms, so the percentage may be updated over time.
Does Xolo calculate the MEI for me?
The MEI forms part of your Social Security obligations. Xolo helps you stay on top of your obligations as an autónomo so there are no surprises.