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Hello and thank you for using Just Answer,The interest on the tax calculation is based on the amount of time between the date the tax was due and the date the payment is received by the Department. There would be no more interest on the actual tax that was due and paid.
A taxpayer has the right to pay all or a part of a tax claim made against him by the Department for the purpose of stopping the running of further interest, and the payment may not prejudice the right to pursue other administrative or judicial remedies provided by statute under section 1108(a) of the FC (72 P. S. § 1108(a)).