You do not receive a "salary" "as cash". A salary is reported on an IRS form W-2, regardless of how paid. If you do not receive a W-2 for $215,000, you have some other kind of income, not a salary.
The IRS considers undocumented cash income (no W-2 or 1099-MISC), for work performed, to be self employment income. Enter at "Business Income & Expenses" and TurboTax (TT) will complete Schedule C or C-EZ for you and allow you to deduct any expenses associated with this income. You'll also have to pay self employment tax (social security & medicare tax) on any profits greater than $400.
A pension contribution, by an employer, must also be handled/documented according to IRS rules. Otherwise, it's not a pension contribution, it's more cash income that must be reported on your tax return. You could then use the money to contribute to a SEP IRA and get a deduction.
