A2A.Proceeds from real estate transactions are typically reported on Form 1099-S. Form 1099-B is typically used to report sales made by a broker, normally stock sales. I'm not sure why you would be getting a 1099-B for a real estate transaction, so I assume you meant 1099-S. How you report it depends on the type of property you sold.If you sold a personal-use property, you use Part II of IRS Form 8949, Sales and Other Dispositions of Capital Assets to compute the gain or loss. If this is your personal home and you qualify for the capital gains exclusion, you incorporate that on Form 8949. You then carry the information to Schedule D (Form 1040), Capital Gains and Losses. You cannot deduct a loss on the sale of a personal-use property.If you sold a property other than a personal-use property, you use IRS Form 4797, Sales of Business Property to report the sale. If you did not use the property in a trade or business but were holding it for investment, the portion of the gain that represents recapture of depreciation is reported as ordinary income, and any remaining gain is carried to Form 8949 and Schedule D and reported as capital gain. If you used the property in a trade or business, you still report depreciation recapture as ordinary income, and any remaining gain from the sale is treated as section 1231 gain. See IRS Publication 544 (2022), Sales and Other Dispositions of Assets for a full description of how to treat section 1231 gain.