also known as comfort lettersare documents from one party written to another party in regards to contingent liability. Comfort letters have been held by courts to be legally enforceable commitments if they meet certain standards criteria of language. Comfort letters meeting these standards are loss contingencies in that they are construed to guarantee a financial commitment and must be reported under Statement of Financial Accounting Standard 5 as a guarantee. Auditors should review the language of all comfort letters and seek to discover contingent liabilities not disclosed in financial statements in situations where comfort letters exist. Sources of information concerning the contingent liabilities of comfort letters include: management and third parties. Auditors should document within the client representations letter management assurances that loss contingencies have been reported.

This definition is in context to Accounting. See more contextual defintions for Keep-well Agreements.