Under what conditions do secessionist parties advance identity, socioeconomic or political frames for constitutional change? By performing a Qualitative Comparative Analysis (QCA) of 93 party manifestos from six Western regions, the results identify a key variable that plays an important role in rhetorical strategies: the governmental status of the party. In linguistically distinctive regions, parties tend to put forward identity frames when in opposition. Instead, being in office is a condition for framing their position in socioeconomic terms. The results concerning political frames are highly complex, although patterns around office holding have also been identified. Hence, the present article shows that office-seeking strategies imply a fundamental change in how these parties frame their claims. Minority nationalist parties take the opportunity of being in office to enhance their credibility as governing parties by downplaying identity issues in favour of a more inclusive and policy-oriented appeal.