Fidelity Investments of Boston and The Vanguard Group of Malvern, Pa. next month will both begin offering their shareholders the ability to file their federal and state income taxes online at no charge. Intuit of San Diego, Calif. will be providing its online tax preparation software, Quicken TurboTax, to both companies.

Fidelity and Vanguard will be offering this service to registered shareholders through their respective web sites, and The tax preparation screen on each site will appear as if it is an indigenous page on each site. In fact, it will be a hyperlink to Intuit's web site, according to spokespeople from Fidelity and Vanguard.

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