DLT: Cananybody explain this one

Indata Company sold a specially manufactured item for $5,000,000 on December 31, 2006. The item was sold on an installment sale basis, with $1,000,000 paid on the date of the sale and $4,000,000 to be paid in four annual installments of $1,000,000 plus interest at the market rate of 6 percent. Indata’s tax rate is 40 percent and its costs to construct the item were $2,500,000. Indata recognizes the entire amount of the sale as income on the date the sale is made for accounting purposes, but not until cash is received for tax purposes. On its balance sheet dated December 31, 2006, Indata will, as a result of the transaction described above, increase its deferred tax: A) liability by $200,000. B) asset by $800,000. C) asset by $200,000. D) liability by $800,000. Your answer: B was incorrect. The correct answer was D) liability by $800,000. Accounting profit from the installment sale was ($5,000,000 - $2,500,000 =) $2,500,000. Income tax expense is calculated based on 40 percent of accounting profit, so tax expense from the transaction is ($2,500,000 * 0.40 =) $1,000,000. Income taxes payable, as of December 31, 2006, were (($1,000,000 – ($2,500,000 * $1,000,000 / $5,000,000)) * 0.40 =) $200,000. The excess of income tax expense over income taxes payable is a credit to deferred tax liability of ($1,000,000 - $200,000 =) $800,000.