Residency is permission to stay and can be withdrawn. Citizenship is a status that is normally permanent and inheritable. The choice follows from what you need.
People often ask for "a second passport" when a residence permit would solve their problem, and occasionally the reverse. The two are different instruments with different costs and different risks.
| Residency | Citizenship | |
|---|---|---|
| What it is | Permission to live in a country | Legal membership of the state |
| Granted by | An administrative decision | An act of the state, normally irrevocable |
| Travel document | No — you keep your own passport | Yes — a passport of that country |
| Can it lapse? | Yes, typically through absence or non-renewal | Normally no |
| Passes to children? | Generally no | Generally yes |
| Voting | No | Yes |
| Typical cost | Lower, often with maintenance costs | Higher, usually one-off |
Buying citizenship in the hope of changing tax residence, or buying residency in the hope of getting a passport quickly. Neither works in that direction. Tax residence is determined mainly by where you actually live; citizenship by investment does not require or create relocation.
If the goal is travel access and family continuity without moving, citizenship is the instrument — see how citizenship by investment works and whether your country allows dual status. If the goal is to live somewhere, residency is.
Describe the outcome you want — travel, relocation, family security — and we will tell you which of the two actually delivers it.