The estimated tax penalty will not be imposed if estimated tax payments equal or exceed the amount of tax liability shown on the taxpayer's return for the preceding tax year. The taxpayer's preceding tax year must have been for a period of twelve (12) months. "Tax liability shown on the taxpayer's return" means total tax, as reported, less business and incentive credits.
1.26 Ark. Code R. 18-208(6)(B)(iii)