If you did not any other income than your OPT and the H-1B from Jul 2018, it may be simpler to just male the first year choice to be treated as a resident for the whole year. advantage ---- you can file using TurboTax and get all the benefits available to a citizen/resident / resident for tax purposes; disadvantage -- you may have to pay FICA for the whole year and the possibility that your OPT employer is not going to pay his half of the FICA for the Jan thru June portion ( so that is essentially a 15.3 % hit on that portion of the income).
To do a dual status filing ( while TurboTax does not walk you through this you can do it yourself with some perseverance ( and possibly loss hair by pulling the same ). In this case you prepare your normal 1040 return using Turbo Tax, print sign, date and then include a downloaded and filled out 1040-NR ( fillable .pdf format ) and hand write on top of the 1040 " Dual Status Alien". You may need help if you proceed with this path and one of us should be able to guide you through the process.
On the other hand , with a little money and professional help you may be able to get this done easily and without any worries.
Anything else we can help you with ?
