I'm looking at doing this. From the FM website "The biggest problem with this is the IRS imposed 2 payments per processor limit. This means that you can liquidate no more than 6 gift cards per type of tax payment.". Meanwhile the IRS website simply says 2 1040-ES payments per quarter. But apparently 2 per processor is allowed. My question is - if Married filing jointly, can we do 2+2=4 per processor?