I have a 1099-g unemployment 2018 and a w2 2018 for a 4 mths can I file them with my 2019 w2 if the w2 in 2018 is from the same job it wasn't enough last year so I didn't file

[xmasbaby0]

Absolutely not.  You cannot put 2018 income on a 2019 tax return.  Only 2019 income can be entered on your 2019 tax return--no other year.

If you want/need to file a 2018 tax return then you use the 2018 forms ---you can purchase the 2018 desktop software or you can use the paper forms and prepare 2018's return by hand to mail in.

To file a return for a prior tax year

If you need to prepare a return for 2016, 2017, or 2018 you can purchase and download desktop software to do it, then print, sign,  and mail the return(s)

https://turbotax.intuit.com/personal-taxes/past-years-products/

Remember to prepare your state return as well—if you live in a state that has a state income tax.

When you mail a tax return, you need to attach any documents showing tax withheld, such as your W-2’s or any 1099’s.  Use a mailing service that will track it, such as UPS or certified mail so you will know the IRS/state received the return.

Note:  The desktop software you need to prepare the prior year return must be installed/downloaded to a full PC or Mac.  It cannot be used on a mobile device.

If you are getting a refund, there is not a penalty for filing past the deadline.  If you owe taxes, the interest/penalties will be calculated by the IRS based on how much you owe and when they receive your return and payment. The IRS will bill you for this; it will not be calculated by TurboTax.

https://ttlc.intuit.com/questions/1900990-how-do-i-file-a-prior-year-tax-return

2018 Form 1040, Schedules and Instructions

https://www.irs.gov/pub/irs-prior/f1040--2018.pdf
 https://www.irs.gov/pub/irs-prior/i1040gi--2018.pdf
2018 Tax and EIC Tables https://www.irs.gov/pub/irs-prior/i1040tt--2018.pdf

IRS 2018 Schedules 1 thru 6 (only if needed)
Sch 1 : https://www.irs.gov/pub/irs-prior/f1040s1--2018.pdf
Sch 2 : https://www.irs.gov/pub/irs-prior/f1040s2--2018.pdf
Sch 3 : https://www.irs.gov/pub/irs-prior/f1040s3--2018.pdf
Sch 4 : https://www.irs.gov/pub/irs-prior/f1040s4--2018.pdf
Sch 5 : https://www.irs.gov/pub/irs-prior/f1040s5--2018.pdf
Sch 6 : https://www.irs.gov/pub/irs-prior/f1040s6--2018.pdf

[patsysrefund]

I need to file this 1099-G for the year 2018. I do not have any money to download this form. Where can I go to do this online for free? I have done my taxes with turbo tax for 2019, but just found out I had a1099-G for 2018. What do I do? 

[xmasbaby0]

Is the 1099G your only income for 2018?  If you cannot purchase 2018 software, then please scroll up in the thread you posted your question to.  Directly above your own post is a reply that gives you the link to the IRS forms to print and complete a 2018 return by hand.

On the other hand---if you filed a 2018 return but left the 1099G out of the other income you reported on your 2018 return, you need to amend the 2018 return.  If you need to amend an already filed 2018 return:

https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed?...