Box1 is less than box3 and box5 because you have pre-tax deduction.
Examples of Pre-Tax Deductions:
- Retirement Savings.
- 401(k) Contribution Limits.
- Employer high deductible health plans and health savings accounts.
- Flexible Savings Accounts.
- Group Insurance Plans.
Generally these pre-tax deductions are listed in either box 12 or box 14.
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