Why the Burden of Proof is on the Taxpayer

The most significant justification for placing the burden of proof on the tax payer is the practical consideration that the Commissioner cannot sustain the burden because he does not possess the needed evidence. Under the system of self-reporting tax liability, the taxpayer possesses the evidence relevant to the determination of tax liability. It is simply fair to place the burden of persuasion on the taxpayer, given that he knows the facts relating to his liability, because the commissioner must rely on circumstantial evidence, most of it coming from the taxpayer and the taxpayer's records. The taxpayer must present a minimum amount of information necessary to support his position. This safety valve seems to place the burden of production on the taxpayer without relieving the Commissioner of the overall burden of proof. The tax payers’ evidence must meet this minimum threshold.