If you and your partner are living together and are both property owners, you need to know that the tax/fiscal benefits you have are not the same that married couples have.
Take inheritance tax as an example, if one of the partners was to pass away leaving their surviving partner as heir, in the event that they are not married, the inheritor would not be eligible for any reductions by kinship and the tax result would be multiplied by 2.
The position of a domestic partner (pareja de hecho) when inheriting from their sentimental partner is compared to that if they were inheriting from a stranger, therefore making it very burdensome and costly for the inheritor as they would have high inheritance tax to pay.
Currently in the Valencian Community, the surviving spouse, ancestors and descendants of the first degree have an individual deduction of 100,000 euros, this means that for the first 100,000 euros received via inheritance will not pay any inheritance tax and will also apply a bonus in the tax rate of 50%.
In the income tax declaration, couples that are married find it more beneficial doing their income tax as a couple if one of the spouses does not receive any income or the income that they receive is low.
The joint declarations can only be submitted if the contributor is part of a family unit, that is, either married or has children (or both), in the case they are not married, one of the parents can declare themselves as a mono-parental unit with children.
in the case of domestic partners, the tax declarations will always have to be submitted as individual.
Another good excuse to get married is simply because of love.