Final answer:
The incremental after-tax cash flow from selling the machine is $770,940. This figure is calculated by considering the machine's book value after depreciation, the sale price, and the taxes on the gains of the sale.
Step-by-step explanation:
To calculate the incremental, after-tax cash flow from selling the machine, we need to account for the depreciation expense and the tax effects of the sale. The machine was purchased for $1.04 million and is being depreciated over ten years, which means an annual depreciation of $104,000 (1.04 million / 10 years). After four years, the accumulated depreciation is $416,000 (4 years * $104,000), which leaves a book value of $624,000 (1.04 million - 416,000).
Since the machine is being sold for $810,000, there is a gain of $186,000 ($810,000 - $624,000). The tax on this gain is 21% of $186,000, which equals $39,060. To obtain the net cash flow, subtract the tax from the selling price giving us $770,940 ($810,000 - $39,060). Therefore, the incremental after-tax cash flow from selling the machine is $770,940.