This is why your monthly quota is provisional: it works as an advance payment toward your final bracket. It pays to review your income forecast during the year and adjust your contribution base (up to 6 changes a year) so the adjustment brings no surprises.
In practice it works like this: you file your income tax return, the AEAT sends your net income to social security, and the TGSS compares it with the bracket you contributed in. If you are a managing partner of an SL, what you receive from the company is also taken into account. If you owe money, you receive a notice with the amount and a deadline to pay it; if you are owed money, it is refunded without you asking.
The typical mistake is staying in the lowest bracket all year while your invoicing grows, and then facing a single lump-sum claim that your cash flow did not plan for. Another error: forgetting that the adjustment is based on the return you filed, so if you correct that return, the result can change.
It is linked to the base de cotización, the self-employed quota, RETA and resident income tax. Keeping your books up to date lets you see mid-year whether your real income is drifting from your forecast, so you can switch brackets in time.
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