I had a 25-year investment plan where i paid monthly premiums total amounting to $50k year to date, of that i withdrew $15k two years after commencing the premium payment which was the allowed withdrawable limit under the plan. The plan basically invested in 5 mutual funds and was managed by an investment management firm. In 2024, i surrendered the entire plan at a loss and received back only $10k and the remainder as surrender charges since i retired it before maturity. so for reporting the capital losses, my cost basis should be $50k or $35k ($50k-$15k)?