Paying Federal Income and FICA Taxes

Your 501(c)(3) must pay withheld income taxes, together with both the employer and employee portions of FICA taxes (minus any advance earned income credit [EIC] payments), electronically using the Electronic Federal Tax Payment System (EFTPS) or by mailing or delivering a check, money order, or cash to an authorized depositary. Note that some taxpayers are required to deposit using EFTPS; see e-file for Charities and Non-Profits on the IRS website for details.

More information on deposits

What was that EIC thing?

Patience, patience!