What the research actually shows
Multiple labor economics studies, including analysis referenced by the Economist and various academic research on multilingual workers, have found measurable wage premiums tied to second-language proficiency. The size of the premium varies considerably by industry, region, and which language is involved, but the underlying pattern holds across most studies: additional language ability correlates with higher compensation, particularly in roles where that ability expands what an employee can actually do for the business.
Where the premium shows up most clearly
Roles involving direct international client contact, sales into new-language markets, or support for teams spanning multiple countries show the clearest link. A support agent who can handle both English and German tickets without a translator is measurably more valuable to a company operating in both markets than one who covers only English.
Turning a certificate into a negotiation point
A certificate on its own rarely moves a salary conversation. What moves it is connecting the certificate to concrete business value: naming a specific client relationship, market, or workflow your language ability directly supports, then presenting the documented level as evidence you can reliably deliver that value, not as an isolated credential.
Getting documented proof
Before raising the topic with a manager, take Examinizer's free test to get an honest, current CEFR level. If it supports your case, download the certificate for €8 and use it as the concrete evidence behind the conversation rather than a vague claim about your language ability.
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Related resources
Common questions
Yes. Research from organizations including the Economist and various labor economics studies has documented measurable wage premiums associated with second-language proficiency, particularly in roles involving international business or client communication.
Published estimates vary by industry, region, and language, generally ranging from a few percent to over 10 percent for roles where the additional language directly expands job responsibilities or client reach, though results differ significantly by study and market.
International business, sales, customer support for global markets, tourism and hospitality, and consulting tend to show the clearest link between language ability and compensation, since the language skill directly expands the value an employee can deliver.
Frame it around business value rather than personal achievement: a documented C1 level that lets you handle a client relationship without a translator or support a new market directly ties to revenue or cost savings, which is a stronger negotiation angle than the certificate alone.
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