What do you mean you are just now filling out a 2017 W-4? Why? If you are starting a job in 2018 you should be filling out a 2018 W-4.
It should look like this: <a rel="nofollow" target="_blank" href="
https://www.irs.gov/pub/irs-pdf/fw4.pdf">https://www.irs.gov/pub/irs-pdf/fw4.pdf</a>
If you were a full-time student for the first 5 months of 2018 then your parents will still be able to claim you as a dependent for 2018.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
