As a foreigner, you have probably been asked to obtain a CDI number to buy real estate in Argentina.
The procedure to get one is easy and straight forward.
The first thing have to consider is your residency status.
If you are officially a resident in Argentina, you will have a DNI (Documento Nacional de Identidad), a Cédula de Identidad (a kind of ID card issued by the Federal Police) or a certificate which states your condition of residency. You can take any of these documents to an AFIP-DGI office and complete the form F663.
If you are not a resident in Argentina and not in the country, you will need someone to start the procedure on your behalf. To do this you need to send to your attorney in Argentina a certified copy of your passport or your national ID card. To make a certified copy of your passport or ID card, you can go to your local Argentine Consulate and they can make it for you, but remember that, in order to be valid, once in Argentina that copy has to be notarised at the Foreign Affairs Ministry in Buenos Aires. If you do not have an Argentine Consulate close to you, you can also certify a copy with a local notary. Make sure that an apostille is added to the notary signature before sending it to your attorney in Argentina.
Once you have completed and presented the F663 form you will receive a Constancia de Inscripción (proof of registration) which the Argentine notary will request at the time of signing the sell-deed.
If you need any help, please do not hesitate to contact me on +44 7970528517