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Modelo 600 (ITP y AJD) – Self-assessment of the tax

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This is the form to pay/declare ITP and AJD when you buy a car from a private person, a second-hand flat, sign a lease subject to ITP, or do notarial acts subject to AJD. You must self-assess it (Modelo 600) with the Hacienda of your Comunidad Autónoma.

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Fuente oficial enlazada6 steps8 documents
Plazo
Immediate online (receipt instantly). In-person depends on appointment: 1–3 weeks.
Coste
Variable según Comunidad y operación (ITP aprox. 4%–11% y AJD aprox. 0,5%–1,5% sobre la base).
Oficial
Fuente oficial

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What the agency does

AEAT

  • Receives and reviews your application
  • Issues the resolution or official document

Guía completa

What you need at hand
  1. Cl@ve or certificado digital to identify yourself on the sede of your Comunidad Autónoma.
  2. Contract or deed that creates the tax (compraventa, alquiler, notarial document) as a PDF.
  3. Asset details: referencia catastral if it’s a flat; registration plate and VIN if it’s a car.
  4. NIF/NIE of buyer and seller/landlord.
  5. A card or account to pay via the gateway (or a printer if you’ll take a carta de pago to the bank).
Documentation
  • DNI/NIE of all parties.
  • Contract/deed with date and declared price/value.
  • Proof of payment (NRC) or carta de pago stamped by the bank.
  • Evidence for any reduction/exemption (familia numerosa, discapacidad, VPO, vivienda habitual…).
  • Vehicles: permiso de circulación and ficha técnica (so DGT data matches).
  • If a third party acts: power of attorney.
Step by step
  1. Open the AEAT info page on Modelo 600: it orients you and links to the rules. You don’t file there, but it’s useful.
  2. Go to the tax sede of your Comunidad (e.g. Madrid, ATC Cataluña, GVA). Search for “Autoliquidación ITP y AJD (Modelo 600)” and log in with Cl@ve/certificado.
  3. Choose the correct modality: ITP (onerous transfers, leases, etc.) or AJD (notarial documents, registrable acts). Pick the specific concept.
  4. Fill in details: parties, addresses, fecha de devengo (the contract/deed date), description of the asset, taxable base and applicable rate. Attach the PDF document.
  5. Calculate the tax using the rate in your Comunidad. If you have a reduction/bonification, tick it and attach proof.
  6. Pay: gateway to get an NRC or download a carta de pago for the bank. Download the receipt and the electronically stamped form.
  7. File electronically (register of the CA) and keep the receipt. If you go in person, book a cita and hand in the copies and payment.
  8. If it’s a vehicle, with the ITP receipt go to DGT to change ownership. If it’s a property, keep the receipt for the Registro if they ask.
Tricks that save time
  • Check the rate and possible bonifications of your Comunidad before paying. Fixing it later is a hassle.
  • Upload the contract/deed as a legible PDF with all pages. Avoid rejections for poor files.
  • If the payment gateway fails, generate a carta de pago and pay at a collaborating bank. Then upload the receipt.
  • For cars, use the valor fiscal published by your CA if available: it avoids value checks.
Common mistakes that can ruin the process
  • Filing in the wrong Comunidad (properties: where the flat is; cars: buyer’s residence). They’ll bounce it or it’ll hang.
  • Missing the 30 días hábiles deadline: surcharges and interest. Set an alarm.
  • Not claiming a bonification you’re entitled to. Getting the money back later is slow.
  • Uploading unsigned or undated documents. The accrual date follows the document date, so watch it.
  • For cars: trying DGT without the ITP receipt. You’ll go home empty-handed.
  1. 1.Open the AEAT info page on Modelo 600 to get your bearings: https://sede.agenciatributaria.gob.es/Sede/otros-impuestos-tasas-estadisticas/itp-ajd/modelo-600.html
  2. 2.Go to the tax website of your Comunidad Autónoma and open the procedure “Autoliquidación ITP y AJD (Modelo 600)” (e.g. Madrid https://www.comunidad.madrid/servicios/tributos/modelo-600-itp-ajd, Cataluña https://atc.gencat.cat/es/tributs/itpajd/, Comunitat Valenciana https://hisenda.gva.es/es/web/tributos/itpajd). Identify yourself with Cl@ve or certificado digital.
  3. 3.Fill in Modelo 600: modality (ITP or AJD), concept (e.g. Transmisión de vehículo usado, Compraventa de inmueble, Arrendamiento, Documento notarial), buyer and seller details, date of accrual, declared value and taxable base. Attach the contract/deed as a PDF.
  4. 4.Calculate the tax due using the rate your Comunidad marks and pay: use the payment gateway to get an NRC or generate a carta de pago for the bank. Keep the receipt and the copy “for the Administration” with the electronic stamp.
  5. 5.Submit the self-assessment and annexes in the assistant (electronic register of your Comunidad). If you prefer in person, book a cita previa and take the copies of Modelo 600 and the proof of payment to a provincial tax office of your Comunidad.
  6. 6.If it’s a vehicle, with the ITP receipt go to DGT to change ownership: https://sede.dgt.gob.es/es/vehiculos/cambio-de-titularidad/. Without the ITP paid or an exemption, DGT will reject the transfer.
  • DNI/NIE of the buyer (taxpayer) and of the seller/landlord (NIF if it’s a company)
  • Document that creates the tax: contract of sale/lease, or notarial deed (scanned PDF)
  • Details of the asset: registration plate and VIN if it’s a vehicle; referencia catastral and address if it’s a property
  • Proof of payment (NRC) or carta de pago / payment slip for the collaborating bank
  • Document proving a reduction/exemption if you claim one (familia numerosa, discapacidad, VPO, vivienda habitual, etc.)
  • Power of attorney if a gestor or a third party acts for you
  • IBAN if you will direct-debit or pay via your Comunidad Autónoma’s payment gateway
  • For vehicles: permiso de circulación and ficha técnica (so data matches DGT)

¿Qué necesito para completar Modelo 600 (ITP y AJD) sin que me lo rechacen?

Modelo 600 (ITP y AJD) tiene una tasa oficial variable en AEAT y se puede presentar por cuenta propia. El punto que interrumpe el trámite es que hace falta Cl@ve activa, y si no está dada de alta el registro previo puede tardar días. Además, el formulario tiene 6 pasos y la sesión de la sede caduca antes de terminar si se interrumpe. GovEasy prepara el expediente completo y comprueba los datos antes de tocar la sede, y si no tienes la identificación digital o la cita, un gestor colegiado del marketplace la gestiona y lo presenta por ti.

  • Cl@ve activa (PIN o permanente)
  • GovEasy (extensión + gestor colegiado)
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Your next step

1.Open the AEAT info page on Modelo 600 to get your bearings: https://sede.agenciatributaria.gob.es/Sede/otros-impuestos-tasas-estadisticas/itp-ajd/modelo-600.html

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