Accurately reporting MW507 form

[sammy01]

I moved from Baltimore County, MD to York County, PA on 3/17/25.

My employer is in Baltimore City. 

When do I fill MW507 form (line 5 & 6) with my employer so that Maryland State and Maryland local taxes aren't withheld, so I am not doubled taxed in both states? 

[MaryK4]

You should have completed the MW507 when you moved so that the withholding was changed.  Note: not all employers are required to submit the Pennsylvania withholding- if your employer does not, you will have to make Pennsylvania estimated payments.