Section 4 : Computation and rate of tax
1) The amount of tax required to be paid by any person referred to in Section 3 for any income year shall be equal to the total amount of tax required to be paid by such person.

a)  Only the income of any employment having source in Nepal is included in the income of that income year,

a) A person who has taxable income in any income year,

b) A non-resident person's foreign permanent establishment situated in Nepal, which sends income of any income year pursuant to Sub-sections (3) and (4) of Section 68, and

c) A person who receives payment final tax withholding in any income year.

2) In computing the tax required to be paid by any person referred to in clause (a) of Section 3, it shall be computed by applying the related rates mentioned in Schedule-1 to the taxable income of that person. In so computing the tax, it shall be computed by deducting the amount that is adjustable in tax, and claimed by that person pursuant to Section 51 or 71.

3) Notwithstanding anything contained in Sub-section (2), the tax payable by a resident natural person referred to in clause (a) of Section 3, who has fulfilled all of the following requirements, shall be equal to the total amount of tax deducted pursuant to Section 87 from the payments made by the employer to such a natural person in that income year:

4) Notwithstanding anything contained in Sub-section (2), the tax payable in any income year by a resident natural person referred in clause (a) of Section 3, who has fulfilled all of the following requirements, shall be equal to the amount mentioned in Sub-section (7) of Section (1) of Schedule –1:

a) That person has only income earned from his business having source in Nepal in that income year,

b) The income earned from the business and turnover of the business do not exceed the ceiling mentioned in Sub-section (6) of Section (1) of Schedule –1, and

c) That person has so opted that this provision is applicable in that income year.

d) Payment of such petty amounts of which accounts are impracticable to be maintained or difficult to be maintained administratively as prescribed.

Explanation: For purposes of this section, "payment" means the payment:-

(a) made by the employer,

(b) made by the associated person of the employer, and

(c) made by any third person as referred to in the agreement made with the employer or his associated person

5) In computing the tax required to be paid by any foreign permanent establishment referred to in clause (b) of Section 3, it shall be computed by applying the related rates mentioned in Sub-section (6) of Section 2 of Schedule-1 to the income sent abroad by such establishment in that income year.

6) The amount of tax required to be paid by the person referred to in clause (c) of Section 3 shall be equal to the total amount computed by applying the rates mentioned in section to the amount of each payment liable to final tax deduction received by that person in that income year.