Can I buy additional licence for TT Business Incorporated? I have three corporations and want to use TT Biz Inc but I am not sure if I can activate multiple licence?

You don’t need another license or computer to do more than 1 personal or business return.  The personal program can do unlimited returns and efile 5 federal for free.  The rest you can print and mail.   And you can use the same program, All the personal Desktop programs have the same forms. You just get more help and guidance in the higher versions. 

BUSINESS

For federal you can use one Business program.  You have to buy the state Business program separately from inside the federal program.

Preparing state tax returns for more than one business?

When they are the same types of businesses (such as two S Corps) and file taxes in the same state, buy one state product and use for all at no extra charge. Business State efile included.

When they are the same types of businesses (such as more than one LLC), but file taxes in different states, buy one product per state for $55.  Business State efile included.

When they are different types of businesses (such as an S Corp and a partnership) and file taxes in the same state, purchase one product for each business type for $55 per each business type. Business State efile included.

TurboTax® Business Desktop 2023-2024 | Tax Software Download

TurboTax Business State products are sold separately by state and entity type. With each TurboTax Business State product, you can complete returns for more than one business only if they are the same entity