Within academia, clear and standardised communication is vital. From this point of departure, we discuss the trustworthiness of teaching portfolios when used in assessment. Here, misconduct and fraud are discussed in terms of fabrication, falsification, and plagiarism, following the literature on research fraud. We argue that the portfolio’s unclear academic status and confusing standards makes it difficult to define misconduct. We see a risk that the practice of portfolio writing for assessment can lead to misconduct, including downright lies about accomplishments. We conclude that the trustworthiness of teaching portfolios is a responsibility for the academic community as a whole