W-2 forms are accessible online, according to TurboTax. After employers deliver W-2s to their employees, typically by mail or electronically, the W-2s are available for import to online tax preparation services such as TurboTax.
W-2s for years prior to the current tax year are not available online. Those seeking W-2s for past years should request them from their employer for that year, according to the Internal Revenue Service. The IRS also makes past years' tax returns, which contain all W-2s for the year, available for a fee. Past years' returns must be ordered by mail and are delivered within 75 days.