The case of Merchants National Bank of Boston, Executor v. Commissioner of Internal Revenue in 1943 revolved around the issue of estate tax deduction. The Supreme Court was tasked with determining whether or not a bequest to charity could be deducted from an estate's gross value before calculating federal taxes due upon death. In this particular case, the decedent had left his residuary estate to various charities but also directed that any inheritance and succession taxes on both realty and personalty payable by reason of his death should come out from these charitable gifts. The IRS disallowed deductions for these amounts when computing net taxable estates which resulted in higher taxation for the executor (Merchants National Bank). However, the Supreme Court ruled against this decision stating that such charges were part and parcel with administering an estate as per state law requirements; hence they must be considered as expenses incurred while managing property passing onto charitable organizations thereby making them deductible under relevant provisions within existing tax codes.

In the dissenting opinion for the case of Merchants National Bank of Boston v. Commissioner of Internal Revenue, 1943, Justice Robert H. Jackson argued that the majority's decision to allow a deduction from gross income for estate taxes paid on life insurance proceeds was inconsistent with both statutory language and legislative intent. He contended that Congress intended to tax net estates rather than gross estates and thus did not intend for such deductions to be made. Furthermore, he pointed out that allowing such deductions would result in unequal treatment among taxpayers because only those who could afford life insurance policies would benefit from this provision while others would bear a heavier burden of taxation. Therefore, he believed it was inappropriate and unfair to interpret tax laws in ways that favored wealthier individuals at the expense of less affluent ones.