The underlying principle is straightforward: a state offers the right to live there to non-citizens who commit a minimum sum in local becici real estate for sale estate. The minimum investment differs greatly across programmes, and the authorities adjust it with limited notice.
An important distinction stands between residence and citizenship. The permit allows you to live there, typically subject to renewal, but full nationality generally takes a long period of residence. A promise of citizenship simply for an apartment purchase is a red flag.
Beyond the investment itself, these schemes impose additional requirements. Common ones cover a police clearance certificate, medical insurance, evidence of sufficient means and a required physical presence in the country per year. Missing one of these can jeopardise the status while you still own the home.
Tax status forms a different question altogether. Holding a residence permit does not by itself make you taxable on worldwide income, but spending enough time in the country often does. A number of states use a threshold based on days spent locally, and the effects reach income earned elsewhere.
The realistic approach is essentially the same everywhere: choose the property first, with the permit as a secondary benefit. Such schemes get restructured from time to time, and a buy property in tremithousa chosen only for a permit proves hard to rent and hard to resell.