Adjustment of Social Security Contributions in the New Self-Employed Scheme
Did you know that with Spain’s new contribution system, your self-employed payments are adjusted at year-end based on your actual income? In this article, we explain how the adjustment works, how it affects your bonuses, and when to update your base to avoid overpaying or underpaying.

Spain’s new contribution system based on actual income requires self-employed workers to adjust their payments according to net earnings. An annual adjustment process corrects any mismatch between what was paid and what should have been paid.
Contributions based on real income
Now, self-employed individuals must choose their contribution base within the range that matches their average monthly net income. This base is provisional and subject to revision at the end of the tax year.
How does the adjustment work?
Once the Tax Agency shares your real income with Social Security:
If you overpaid → you’ll be refunded the difference.
If you underpaid → you’ll need to settle the outstanding amount.
This system ensures that contributions match actual earnings.
Bonuses and adjustments
If your final base is below €950.98/month, some bonuses may be reduced. However, others remain intact:
Work-life balance support
Leave for birth or adoption
Return after maternity leave
Caring for a seriously ill child
These benefits are maintained even if your income turns out to be lower than expected.
When can you adjust your base?
You can change your contribution base up to 6 times per year. Changes take effect according to this schedule:
Jan–Feb → March
Mar–Apr → May
May–Jun → July
Jul–Aug → September
Sep–Oct → November
Nov–Dec → January (next year)
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