Example: Jones contracts to sell an item of section 1245 property for $10,000 to be paid in 10 equal payments of $1,000 each, plus a sufficient amount of interest so that section 483 does not apply. He properly elects under section 453 to report under the installment method gain of $2,000 to which section 1245(a)(1) applies and gain of $1,000 to which section 1231 applies. Accordingly, $300 of each of the first 6 installment payments and $200 of the seventh installment payment is ordinary income under section 1245(a)(1), and $100 of the seventh installment payment and $300 of each of the last 3 installment payments is gain under section 1231.
26 C.F.R. §1.1245-6