What is a specific threat when offering tax services?

The specific threat associated with offering tax services is self-interest through contingent fees. This type of threat arises when a tax service provider's fees are dependent on the outcomes of their work, which can create a conflict of interest. For instance, if a tax advisor charges fees based on the amount of tax saved for a client, they may be incentivized to take aggressive positions on tax returns that carry a higher risk of being challenged by tax authorities. This situation compromises the auditor's objectivity and neutrality, as their financial gain is tied to the success of their tax strategies.

In the context of audit and assurance, maintaining independence is paramount, as it ensures the integrity and reliability of financial reporting. When fees are contingent, there is a risk that the service provider may prioritize personal financial gain over ethical considerations and the best interests of the client, potentially compromising their professional judgment.

The other considerations in the answer choices, such as overreliance on client information, lack of professionally qualified staff, and high levels of client dissatisfaction, while potentially significant in a broader operational context, do not specifically relate to the unique ethical conflict posed by contingent fees in the provision of tax services.