The next quarterly estimated tax payment deadline is June 15 for individuals and businesses so it’s a good time to review the rules for computing corporate federal estimated payments. You want your business to pay the minimum amount of estimated taxes without triggering the penalty for underpayment of estimated tax. Four methods The required installment of estimated tax that a corporation must pay to avoid a penalty is the lowest amount determined under each of the following four methods: Under the current year method, a corporation can avoid the estimated tax underpayment penalty by paying 25% of the tax shown on the current tax year’s return (or, if no return is filed, 25% of the tax for the current year) by each of four installment due dates. The...