What is the maximum number of card payments allowed?
You can make up to two payments for the same Social Security Number and tax return type (e.g., 1040, 4868, 1040ES) during the same tax year (1040, 4868), quarter (1040ES) or month (Installment Agreement payments for Form 1040 and for a Trust Fund Recovery Penalty). For Trust Fund Recover Penalty for Prior Tax Years you can make two payments per quarter.