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If you live with your parents or with anyone else without a rental contract, it does not affect your tax report. You simply need to provide the address of your residence.

However, if you rent a property, whether or not it’s shared with someone else, the Tax Agency may apply benefits for the primary residence deduction if you meet specific requirements:

• Primary residence rental: This deduction applies to those with a rental contract in their name. In some autonomous communities, you can deduct a percentage of the rent paid if your income does not exceed certain limits.
• Shared residence: If you rent with another person and each pays 50% of the rent, you must reflect your portion in the tax report. The Tax Agency allows you to deduct only the part of the rent you personally cover, as long as you present a contract in your name and a receipt showing your contribution.

It's recommended to check the requirements in your Autonomous Community (Comunidad Autónoma), as some offer additional deductions for young people or low-income families.