gift tax is calculated as the value of the account at the time of the gift, any value above $14,400 is taxable
http://www.irs.gov/Businesses/Small-Businesses-&-Self-Employed/Frequently-Asked-Questions-on-Gift-Taxes
This is due at the year in which the gift is given。但是你不用付。
第二,你要付增值稅
for capital gain tax when you sell any of the security, basis of the stock is HER base when SHE bought it, not the value of the stocks when she gifted it to you.
This is due at the year when a certain stock is sold.
For example, she bought stock at $50, gifted to you at $40, you sold at $60, your taxable gain is $60-50. $40 is not relevant.
ask an accountant.