[loeg]

https://www.irs.gov/forms-pubs/about-form-w-4

Fill it out correctly and your employers will do the right thing.

[dpkirchner]

I think the W-4 only applies to federal income tax. There's no field that instructs employers how much to pay in FICA (their share and yours). At best you can reduce withholdings to account for the excess FICA payments.

[loeg]

It's all total tax burden. Dollars are fungible.