That is up to you to keep the first job. It won't affect you either way. It's ok to have 2 or more jobs at the same time. You pay tax at the end of the year on your total income from all jobs. You fill out a tax return and it calculates how much tax you owe on your total income. You won't owe any tax until you make over $12,200 total for the whole year. Which means the first 12,200 of income is tax free. Except for the SS and Medicare taxes. Oh the 12,200 is only for Federal Tax. State tax is separate.
Then if you have more withholding taken out than the tax you get a refund. Or you might be short and owe some more. Hope that helps and is clear.
