La. Revenue and Taxation § 47:287.657
A corporation may make estimated payments to the department, following the process prescribed by the department, of the state tax expected to result from a pending Internal Revenue Service audit prior to the due date of the federal adjustments report. The estimated tax payments shall be credited against any corporation income tax liability ultimately found to be due to the state attributable to the federal adjustments report and shall limit the accrual of interest pursuant to R.S. 47:1601 on that amount. If the estimated tax payments exceed the final state tax liability attributable to the federal adjustments report the taxpayer is entitled to a refund, subject to the credit and offset provisions of R.S. 47:1622, provided the taxpayer files a federal adjustments report or claim for refund of an overpayment of tax pursuant to R.S. 47:1621 no later than one year following the final determination date. Interest pursuant to R.S. 47:1624 shall be computed and allowed only on estimated tax payments beginning ninety days after the taxpayer files a federal adjustments report or claim for refund of an overpayment of tax pursuant to R.S. 47:1621.
La. Revenue and Taxation § 47:287.657