What's the difference between the Single Permit and the EU Blue Card for working in Bulgaria?

Both let a non-EU national work and live in Bulgaria, but they suit different situations. The Single Permit is the main route for most employees: it bundles work and residence into one document tied to a specific employer and role, with the Employment Agency checking access to the labour market. The EU Blue Card is aimed at highly qualified professionals — it requires recognised higher qualifications and a gross salary at or above a national threshold set at 1.5 times the average gross salary using National Statistical Institute data (so the figure moves over time). The Blue Card generally offers a longer validity and a clearer path toward long-term residence and movement within the EU. If you're highly qualified and well paid, the Blue Card is often the stronger option; otherwise the Single Permit is the standard path.