I have short term capital gain of Rs. 400000/- from equity. I have no other income. How will it be taxed.

Ans: Salary received for employment exercised outside India will be taxable in India only if person resident of India. Salary income is taxable as per slab rate. Tax on Capital gain will depend on nature of capital asset which is transferred.

10% on LTCG above 1 lakh (On sale of Equity shares/ units of equity oriented fund)
20% on other LTCG

15% on STCG on STT paid transactions
slab rate in case of other STCG

Ans: To calculate your tax liability in India based on the provided information, we need to consider the tax rates for long-term capital gains (LTCG) and short-term capital gains (STCG), as well as the treatment of losses from Futures and Options (F&O).

Long-term capital gains (LTCG):

LTCG on shares is taxable at a rate of 10% if the gains exceed Rs. 1 lakh.
In your case, the LTCG is Rs. 524,352, which is below the threshold of Rs. 1 lakh. Therefore, tax is payable on the LTCG @ 10% of Rs. 424,352 = Rs. 42435/=
Short-term capital gains (STCG):

STCG on shares is taxable at the applicable income tax slab rates.
Assuming you fall under the highest income tax slab rate of 30%, the tax on STCG would be calculated as follows:
STCG tax = STCG * tax rate
= 932,400 * 30%
= 279,720
Losses from Futures and Options (F&O):

F&O losses can be set off against both long-term and short-term capital gains.
In your case, the F&O loss is Rs. 512,352.
Since you have both long-term and short-term gains, you can set off the F&O loss against these gains.
Calculating the tax liability:

Net Short-term Capital Gains (STCG): 932,400

F&O Loss: -512,352

Taxable Short-term Capital Gains: 932,400 - 512,352 = 420,048

Tax on Short-term Capital Gains: 420,048 * 30% = 126,014.40

Total Tax Liability:
Tax liability = Tax on Short-term Capital Gains
= 126,014.40

Long term capital = 42435=20

Ans: You are below the exemption limit and hence not liable to tax.

Please take your CAs advice before moving ahead.

Ans: Not required to pay any income tax.

Please take your CAs advice before moving ahead.