Sometimes Box 1 is lower, but not always. Box 18 is for state and local taxes, not all W-2 will have these. If you are working in an area that has these taxes, it is common for the amount in Box 18 to match those other boxes you have mentioned. Those boxes represent your wage base for taxes. Box 1 is wages for federal taxes, Box 3 is wages for SS tax, Box 5 is wages for Medicare tax, Box 16 is wages for state income tax, and Box 18 is wage base for local taxes. You can verify with your employer what those local taxes are for, most likely it is a school district or some kind of municipality (town or city).
Just enter your W-2 exactly how you see it and TurboTax will take care of putting those amounts on the correct tax return. Your situation is a normal one. @Staticcreature
If any of the W-2s are W-2Cs (corrected copies of the same W-2), only enter those one time each.
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