Not out-going amounts from said checking account. That would be double-dipping IMO.
See excerpt below from http://1040relief.blogspot.com/p/getting-started.html
From the moment one starts writing “lawful money and full discharge is demanded for all transactions 12 USC 411, 95a(2)” on the front of one’s checks and deposit slips, underneath one’s name and address in the upper left-hand corner of these documents, then one can start subtracting those transaction amounts on the IRS 1040 forms (out-going amounts of LAWFUL money excluded). This can result in a substantial refund when the amounts of all said transactions from that point on are subtracted from one’s gross income.
All transactions that are legitimately presumed to be transacted in the default private fiat currency (FRNs), should be included in the total amount on Line 21.
These would include, for example, all of the payroll check withholding amounts that are derivatives of the Gross Pay amount, and correctly presumed to have been ledgered/denominated in FRNs.