The purpose of the Electronic Filing and Payment Fairness Act is to update the rules regarding how documents and payments are submitted electronically to the Internal Revenue Service (IRS). The main objective is to ensure that the date a taxpayer electronically submits their documents or payments is considered the official date of submission, rather than the date the IRS receives or processes them. Key provisions of this act include a change to the Internal Revenue Code that allows for the application of the "mailbox rule" to electronic submissions.