Pre-tax deductions: Medical and dental benefits, 401(k) retirement plans (for federal and most state income taxes) and group-term life insurance. Mandatory deductions: Federal and state income tax, FICA taxes, and wage garnishments. Post-tax deductions: Garnishments, Roth IRA retirement plans and charitable donations.
Employers are required by law to withhold employment taxes from their employees. Employment taxes include federal income tax withholding and Social Security and Medicare Taxes.
The child must be: (a) under age 19 at the end of the year and younger than you (or your spouse, if filing jointly), (b) under age 24 at the end of the year, a full- time student, and younger than you (or your spouse, if filing jointly), or (c) any age if permanently and totally disabled.
Make sure your dependent meets the IRS requirements. Generally, the IRS requires that the child is under the age of 19 (or under 24 if a full-time student), lives with you for more than half the year, and does not provide more than half of their own financial support.
If you want to get close to withholding your exact tax obligation, then claim 2 allowances for both you and your spouse, and then claim allowances for however many dependents you have (so if you have 2 dependents, you'd want to claim 4 allowances to get close to withholding your exact tax obligation).
The rule is that if someone ``can'' claim you as a dependent, you must check the box. It is not, did or will someone claim you as a dependent. There is nothing that requires your parents to claim you as a dependent if you qualify, they will just be giving up a $500 credit (potentially).