Use Schedule A (Form 1040 or 1040-SR) to figure your itemized deductions. In most cases, your federal income tax will be less if you take the larger of your itemized deductions or your standard deduction.
Under an asset sale, the seller could be any of a sole trader, partnership or limited company. However, with a share transfer, this option is only available where the business being purchased is owned by a limited company.
The biggest difference is that an SPA is the sale of all shares, and an APA is the sale of selected assets. Therefore, they are both different transactions and have different procedures.