Can I claim deductions on investments, insurance etc. purchased after end of financial year?

This discussion addresses whether tax deductions can be claimed for investments, insurance, or other expenses purchased after the end of the financial year (31st March). Generally, deductions under sections 80C to 80U cannot be claimed for purchases made after the financial year has closed. However, some specific claims like LTA/LTC might be permissible under Section 10 even after the year-end, and certain capital gains deductions may be available subject to conditions.