The CD/download version of TurboTax allows you to prepare up to 12 returns. This page shows how many returns each version supports (up top, just under the price): https://turbotax.intuit.ca/personal-tax-software/download-tax-software.jsp
Note: Only our CD/download editions (for Windows) support the preparation of multiple returns for a fixed price. With our online editions, the price listed is per return. You can compare our online editions here: https://turbotax.intuit.ca/personal-tax-software/online-tax-software.jsp
