If you want to file more than one tax return, consider using TurboTax Desktop instead of TurboTax Online. You can e-file 5 tax returns using the same TurboTax Desktop software.
If you use TurboTax Online to file multiple returns, each tax return will need its own Intuit Account with a unique user ID and password. Plus, each tax return will be subject to its own fees.
Our license agreement doesn't allow TurboTax to be used for commercial or professional tax preparation. If you need to e-file multiple returns because you prepare taxes for a living, check out our professional tax software.