Section 94 : Payment of tax in installment:
1) A person who has or will have assessable income in any income year from any business or investment has to pay tax in three installments as follows:

Explanation: For purposes of this Sub-section,-

(a) "Estimated tax" means the estimated tax in installment computed by any person liable to pay tax in installment pursuant to Section 95 at the time when the installment tax is to be paid in any year.

(b) "Already paid tax" means the following total sum:-

    (1) The amount of tax paid in that income year by a prior installment before the date on which the installment in question is to be paid,

    (2) The amount of tax deducted from the payments to be included in computing the income of any person in any income year pursuant to Chapter-17 before the date on which the installment in question is to be paid in that year,

    (3) In cases where the agent withholding tax or the person subject to tax withholding pays to the Department the amount of tax deemed to be withheld from the payment referred to in clause (2) pursuant to Sub-section (3) of Section 90 in that year before the date on which the installment is to be paid, such amount of tax, and

    (4) The amount of tax adjustment for medical treatment expenses which that person may claim pursuant to Section 51 in respect of the accepted medical treatment expenses incurred by that person before the date on which the installment is to be paid.

2) Notwithstanding anything contained in Sub-section (1), in cases where the amount of installment to be paid pursuant to that Subsection is less than Two Thousand Rupees, amount of such installment need not to be paid.

3) The person paying installment shall be allowed to deduct the amount of tax paid by way of installment in any year pursuant to this Section for the tax chargeable in that year.