No. if you did not check the box (or have Turbotax check it for you), on form 1040, saying that you can be claimed as a dependent, then you parents cannot claim you.
However, you can file an amendment return, unclaiming your self, and that will allow them to claim you. They do not need to wait for your amended return to be fully processed. But, they cannot e-file. they have to mail in a paper return.
if your income is from earned income (wages or self employment) or even taxable scholarships, you pay the same tax (or get the same refund) regardless of whether you are a dependent or not. This is new for 2018. That was not true in past years.
The real question is: do you qualify as your parent's dependent. There are two types of dependents, "Qualifying Children"(QC) and standard ("Qualifying Relative" in IRS parlance even though they don't have to actually be related). There is no income limit for a QC but there is an age limit, a relationship test and residence test. Only a QC qualifies a taxpayer for the Earned Income Credit.
A child of a taxpayer can still be a “Qualifying Child” (QC) dependent, regardless of his/her income, if:
- He is under age 19, or under 24 if a full time student for at least 5 months of the year, or is totally & permanently disabled
- He did not provide more than 1/2 his own support. Scholarships are considered third party support and not as support provided by the student.
- He lived with the parent (including temporary absences such as away at school) for more than half the year
If you do not meet the rules for a QC, then you cannot be your parent's standard dependent, if you have more than $4150 of reportable income. See full rules at:
https://turbotax.intuit.com/tax-tools/tax-tips/Family/Rules-for-Claiming-a-Dependent-on-Your-Tax-Ret...
