即使不是官方的,灾害比如火灾或者偷窃造成的损失当然也可以从basis减掉(特别金额大的话),读一下IRS

关于casualty and theft losses 的解读吧(下面是截图,详情见https://www.irs.gov/publications/p547#:~:text=A%20casualty%20occurs%20when%20your,institution%20becomes%20insolvent%20or%20bankrupt.):

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