How to adjust your income to change your contribution Bracket as a Self-Employed Worker in Spain
If your income has changed this year, there's a good chance you're either overpaying your monthly social security contribution - or underpaying, which could mean an unexpected bill when the annual regularisation comes around. The real-income contribution system allows you to adjust your bracket up to 6 times per year. Here's how to do it correctly.
What are self-employed contribution brackets?
Since 2023, self-employed workers (autónomos) in Spain contribute to Social Security based on their actual net income, not a freely chosen fixed base. The Social Security system divides income into brackets, each with a corresponding monthly contribution.
2026 Bracket Table:
The full updated bracket table is published on the Social Security website.
When can you change your bracket?
You can modify your contribution base up to 6 times per year, within the following deadlines:
Important: changes are not immediate. If you notice in June that your income has increased, submit the change before the end of July so it takes effect in September.
How to know which bracket you're in
Your bracket is calculated based on your net income, which is:
revenue -deductible expenses - 7% hard-to-justify expenses = net income
Divide the annual result by 12 to get your monthly net income, then match it to the table above.
Practical example:
Annual revenue: €28,000
Deductible expenses: €6,000
Net income: €22,000 → €22,000 / 12 = €1,833/month
Corresponding bracket: €1,700 - €1,850/month
What happens if you don't adjust your bracket
At the end of the tax year, Social Security runs an annual regularisation. If you've been contributing below your actual bracket, you'll receive a bill for the difference. If you've overpaid, you'll get a refund - but that money will have been sitting with the government all year, unavailable to you.
Adjusting your bracket during the year simply means paying what you actually owe - no more, no less.
Steps to change your contribution bracket
Go to the Social Security Electronic Office (Import·aSS or Sistema RED)
Log in with your digital certificate, electronic ID or Cl@ve
Navigate to Self-employed → Modify contribution base
Enter your projected net income for the rest of the year
The system automatically calculates your new bracket
Confirm the change before the last day of the relevant month
Most common mistakes when adjusting your contribution
Calculating income without deducting expenses -the bracket is based on net income, not gross revenue
Missing the deadline - one day late means the change won't take effect for another two months
Not reviewing your projection mid-year -if by July your income looks very different from what you expected, update it
Forgetting income from other activities - if you have more than one economic activity, all net income counts together
Key takeaways
You can change your bracket up to 6 times per year
Changes are not immediate -request them in advance
Your bracket is calculated on net income, not gross revenue
Not adjusting can cost you money at the annual regularisation
