"Is there a way to upgrade TurboTax Home and Business to TurboTax Business?"
No, there is no way to upgrade to TurboTax Business since that product is designed to prepare income tax returns solely for entities (e.g., corporations, partnerships, estates/trusts) while TurboTax Home & Business is designed to prepare income tax returns solely for individuals.
You will have to purchase TurboTax Business separately if you want to prepare the income tax return for your S corporation with a TurboTax product. Also, recall that you will still need a personal income tax product, such as TurboTax Home & Business, to prepare your individual income tax return (e.g., 1040).
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