Cap gain on sale of primary residence
I owned a house and an adjacent unimproved lot and lived there for 45 years. Sold the lot in Sept 2019 and the house in March 2020. The gain on both combined was well under the $500,00 limit for joint filers. According to IRS the lot can be considered part of residence and is eligible for cap gain exclusion just like the house if both are sold within 2 yrs of each other. But they must be treated as a single transaction for tax purposes (according to pub 523). A 1099-S was sent to IRS for the lot because I answered a certification form question wrong but none was for house. How do I claim them as a single transaction for tax purposes when they occurred in two different years?