1031 Exchange Calculator the below 1031 calculator will help you figure out the crucial deadlines in your 1031 exchange. January February March April May June July August September October November December 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 2020 2021 2022 2023 2024 2025 2026 Initial sale date: 45 day identification period ends: 180 day purchase date ends: