-12-
evidence to that effect is petitioner’s own self-serving
testimony, which we do not find to be credible. Id.
Finally, with respect to the office, bad debt, advertising,
and taxes and licenses expenses, petitioner vaguely described
what he incurred. Petitioner did not, however, introduce any
documentation to show the amount of any of these expenses. For
the insurance, interest, depreciation, and legal and professional
expenses, petitioners offered nothing.
We conclude that petitioners failed to substantiate any
repair and maintenance, supplies, bad debt, office, insurance,
interest, depreciation, advertising, taxes and licenses, and
legal and professional expenses, and thus they are not entitled
to any deduction beyond what respondent previously allowed. No
additional amount may be estimated under the Cohan rule because
there is no basis to do so. See Vanicek v. Commissioner, supra
at 742-743.
II. Section 274(d) Expenses
We turn next to the business expenses that are subject to the
strict substantiation requirements of section 274(d). In
addition to the general substantiation requirements, taxpayers
must substantiate certain business expenses, such as car and
truck, travel, and meals and entertainment expenses, by adequate
records or by sufficient evidence corroborating the taxpayer’s
own statement. Sec. 274. The substantiation must show the
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