You should enter all of the withholding shown on your W-2. However, if you have one W-2 that shows the same state, and different locality information in boxes 18 and 19, but the same locality in Box 20, check with your employer to determine whether one of the duplicate localities is incorrect.
All of the wages taxed by one locality on one W-2 should be on a single line. If necessary, add the amounts in boxes 18 and 19 in the separate rows together so there is just one row that goes with a particular locality identified in Box 20.
The entry in W-2, Box 20, is the name of the locality responsible for assessing your local income tax. It could be a city, town, school district, or something else.
Depending on where you live, you may even have more than one locality. If you do, just add a new row in the W-2 entry section to enter info for another locality. Click on "+Add another locality" and TurboTax will add another row of entry boxes. You can add several rows if you have several different localities.
See this help article for information on city taxes that can be prepared with TurboTax.
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