Official letters
I made a mistake in a tax return and owed more
If you owe more or are due a smaller refund, you correct it with a supplementary return.
What it is for
To complete or amend an earlier return when more is payable or less is refundable.
«Las autoliquidaciones complementarias tendrán como finalidad completar o modificar las presentadas con anterioridad»
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General information, not advice on your specific case. Text prepared with the help of artificial intelligence; every quotation is a verbatim extract from the official text and is checked against the BOE every night. Other common letters.