Form 583-Technical assistance

Filing of a supplementary self-assessment of form 583

To file a supplementary tax return, first you must find the original tax return to which you will complement. The taxpayer's Tax ID must be entered to carry out the search. However, to narrow the results, you can indicate the fiscal year, period and type of tax return (supplemented, supplemented or complementary).

The table will show the localised tax returns; To access the filing of the supplementary tax return, click on the link in the column "Filing date."

Consult the notification in which a supplementary tax return is reported. Next, select the complementary self-assessment type, depending on the result and payment method, and click on "Continue."

The form will be displayed with the details of the original tax return already loaded and you will only have to enter the details relating to the payment, if applicable, and those of the supplementary tax return. Remember that the amounts will be filled in euros and with two decimal places separated by a comma. Click on "Send Filing" to complete the presentation.