There are four reasons why buyers and sellers need to undergo due diligence, as identified by the Corporate Finance Institute:

1. To confirm and verify information brought up during the deal or investment process.
2. To identify potential defects in the deal or investment opportunity and thus avoid a bad business transaction.
3. To obtain information useful in valuing the deal.
4. To make sure the deal or investment opportunity complies with the investment or deal criteria.

These elements are essential to both buyers and sellers to secure the deal. For the buyer, it offers comfort that their expectations regarding the transaction are correct. Due diligence benefits the seller by revealing fair-market value of the company. 

When internal resources are stretched to offer this information, third-party experts can assist. CFOs who consider utilizing experts can pinpoint risks, minimize them, and finalize transactions.