There is no additional fee. The basic instructions for obtaining an ITIN are set out below. Your husband has the option of taking his proof of identity to the US Embassy in India or an acceptance agent there to speed up the process. Once you have his ITIN form, mail that along with the tax return to the IRS at the special address in Austin. Follow this link for a list of acceptance agents in India.
https://www.irs.gov/portal/site/irspup/menuitem.143f806b5568dcd501db6ba54251a0a0/?vgnextoid=eaa4cefb...https://ttlc.intuit.com/replies/3300174
