Can I add box numbers up in box 18 if the locality name is the same, but in box 19 the numbers are different?

[JamesG1]

As a rule, adding up W-2 box 18-20 local wages and taxes is not recommended.  It is usually best to enter the information as it appears on your W-2.

In TurboTax Online, select Add another locality to add another row of boxes 18-20.

 

[Hal_Al]

If you are in Ohio, you may be subject to both city income tax and School District income tax. That might explain why the box 20  names are similar.

The fact that the box 18 numbers are the same supports this theory, particularly if the box 18 amount is the same as box 16. 

Box 18 is the amount of income  subject to local tax (usually the same as the amount subject to state tax) and box 19 is the amount of tax withheld for the box 20 city or school district.