If you itemize deductions, likely the convenience fee is tax deductible. The IRS hasn’t said whether this specific convenience fee is deductible as part of your real estate taxes (which has no income threshold) or as a miscellaneous itemized deduction (which has a 2%-of-adjusted-gross income threshold), but prior guidance (IR-2009-37) on a similar topic may be helpful: The IRS ruled that the convenience fee paid when charging federal income taxes was deductible, but only as a miscellaneous itemized deduction.
A credit for income taxes paid to a foreign country or U.S. possession. 401(k) plan. A deferred pay plan, authorized by Section 401(k) of the Internal Revenue Code, under which a percentage of an employee’s salary is withheld and placed in a savings account or the company’s profit-sharing plan. Income accumulates on the deferred amount until withdrawn by the employee at age 59?