What will happen to an Indian citizen's income tax file when she gets married to a foreigner and acquires foreign citizenship?
An income which is earned by an expatriate in India is taxable in
India irrespective of the foreign national's citizenship or
residential status.This payment may also be subjected to TDS (Tax
Deducted at Source) in India.
If your total income is less than the minimum exempt income (Rs
2,50,000 for FY 2014-15) you can get a refund of this TDS by filing an
Income Tax Return in India.
An expatriate in India is someone who comes to live in India and is
not a citizen of India.
So she will still need to file taxes, she may be taxed differently. It would be best to consult an accountant proficient in Indian tax codes.
Can she apply for an Aadhaar card as a foreign resident in India?
AADHAAR card is available free of cost to all citizen and
residents of India, including NRIs and resident foreign nationals,
regardless of the their citizenship.