As used in this chapter:
"Taxpayer" excludes all individuals, partnerships, corporations, associations, and joint-stock companies, their executors, administrators, and receivers who are defined in Title LVII of the Revised Code as financial institutions, dealers in intangibles, domestic insurance companies, or public utilities, except to the extent they may be required by sections 5711.01 to 5711.36 of the Revised Code, to make returns as fiduciaries, or by section 5725.26 of the Revised Code, to make returns of property leased, or held for the purpose of leasing, to others if the owner or lessor of the property acquired it for the sole purpose of leasing it to others or to the extent that property is taxable under section 5725.25 of the Revised Code.
R.C. § 5711.01