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A frontier worker, in terms of taxation, is an individual who regularly travels between their residence and workplace across a border, typically on a daily basis. This definition is important to understand as it applies to tax laws and liabilities. It is crucial for individuals in this category to be aware of their tax obligations in both their country of residence and employment. This designation can have significant implications for their financial planning and future tax returns. As such, it is essential to have a thorough understanding of the concept of a frontier worker in the context of finance.