Hello, Iia -
Your employer / employers in 2017 are responsible for supplying your W2 forms showing your earnings and deducted taxes for 2017.
Some employers provide W2s on their company websites, requiring current and former employees to sign in, giving their Social Security numbers and / or employee numbers.
See information from the U.S. Internal Revenue Service about W-2 forms here:
You will need to contact your employer / employers for whom you worked in 2017.
Note: If you worked as a contractor, you will need to obtain a 1099-MISC form from the individuals or companies for which you worked as a contractor in 2017.
See information from the IRS about 1099-MISC forms here:
I am a librarian by profession and have answered questions like yours for years.
Note: For many questions you may have regarding your Federal income taxes, you can find informative publications through the IRS website:
or in documents you can photocopy at your local public library.
If you find you need more help and explanations than what you can determine from the IRS documents, you will need to seek advice from a person who is a professional in income tax preparation. Note: Any of the librarians at your local public library will only direct you to sources of information, but will not help you with your income tax preparation. They will advise you to seek professional income tax preparation help.
Some people may be eligible for free tax return preparation. See the information here: