You may pay 15% on $44,000.- IRS will be glad to have these money - $6600 plus California taxes. This would be based on assumption that your basis is zero. Don't forget that you will have taxes in the coming years as you will receive additional payments.
Establishing the basis will reduce your taxable gain. Thus as your share of the business was inherited - you will have step-up basis that is the fair market value of th e business at the time your grandfather died. I understand that it is hard to establish such value since over twenty years past over, but it definitely not zero and it would be beneficial for you.
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