This is a question about the 0 or 1 on your W4 for 2021. You can claim either one. If you are not expecting income from this job then you should claim the 0 on the w4, but if you are expecting income from this job then you should claim the 1 on the w4. In order to know whether you should claim 0 or 1, there are a few things that need to be evaluated: If you expect more than $2,400 in taxable wages for 2021 If your employer is withholding Social Security and Medicare taxes If your employer will withhold federal income tax from your wages The IRS calculates your withholding based on the number of allowances you claim on your W-4. For example, if you are single and have one job, you would claim one allowance. If the 0 and 1 seem too confusing for you, we recommend using a withholding calculator to see what is best for your situation.