The IRS e-file Refund Cycle Chart is not more accurate than the IRS "Where's My Refund?" tool. The IRS "Where's My Refund?" tool details information specific to a taxpayer rather than the generalized information on the IRS e-file Refund Cycle Chart.
"Where's My Refund?" is an IRS tool that tracks a taxpayer's specific refund based on unique identifying information, like a Social Security Number, making this the most accurate way to check the status of a tax refund. The IRS e-file Refund Cycle Chart provides general information that can be used as a rough timeline but, is provided as a reference rather than a direct and personalized source of information.