Procedure 15: request additional supplement to your pension (INSS)

What you need to have ready

1. Cl@ve, certificado digital or DNIe that works. 2) Your pension details (número de expediente). 3) IBAN in your name. 4) Recent empadronamiento (colectivo if possible). 5) Renta or certificado de imputaciones from the AEAT. 6) Libro de familia/certificaciones de nacimiento if you're claiming the brecha de género complemento.

Documentation

• DNI/NIE and, if applicable, TIE or certificado de registro UE.
• Resolución or número de expediente of your pension.
• Updated certificado de empadronamiento colectivo.
• Renta declaration or certificado de imputaciones/retenciones from the AEAT.
• Proof of bank account ownership (IBAN in your name).
• Libro de familia or birth certificaciones (for brecha de género).
• Certificado de convivencia if it is required for mínimos.

Step by step

1. Log into Tu Seguridad Social (sede.seg-social.gob.es) with Cl@ve/certificado. Go to Pensiones and open your expediente.
2. Look for Solicitar complementos (mínimos or brecha de género). For mínimos they'll ask income for the year and convivencia; for brecha de género they want child data.
3. Fill in the form and attach PDFs: empadronamiento colectivo, IRPF or certificado de imputaciones, and libro de familia if applicable.
4. Check everything, sign electronically and present. Save the justificante with número de registro.
5. If you prefer paper, book cita previa at the Sede de la Seguridad Social, print and sign the INSS application form, and take it with copies to your CAISS.
6. If you get a requerimiento, go back to the Sede and use “Aportar documentación” to upload what's missing within the deadline.
7. Track the status in Tu Seguridad Social. When the resolución is issued, you'll see the new amount on the next payment.

Tricks that save time

• Upload clear, readable PDFs and keep each document as a single PDF when possible.
• The certificado de imputaciones from the AEAT usually serves if you don't file a Renta; get it online and avoid trips.
• For empadronamiento, request the colectivo (it shows who lives with you). Avoid rejection for incorrect convivencia proof.
• If the web errors, use a desktop with Chrome and disable blockers. Mobile signing can hang sometimes.
• In-person appointments fill fast: check early morning and mid-afternoon when slots are released.

Common mistakes that can mess up your claim

• Not declaring ALL incomes (rents, interest, foreign pensions). They can deny the supplement or later reclaim money.
• Uploading expired empadronamientos or individual ones when they asked for colectivo.
• Claiming the brecha de género supplement without correctly proving births.
• Changing situation (income/convivencia) and not notifying the INSS within 30 días. You'll likely have to return funds with retroactive effects.
• Filing too late hoping for large atrasos. They usually apply from the month after the application.