No one knows yet what all is going on or what will happen. Since it's a generalized problem, you could probably get the IRS to forgive it by explaining the TurboTax issue, or TurboTax may inform them of the issue proactively. In any case, in a worst case scenario, a late payment penalty of 0.5% can't amount to much, unless the tax bill is high. But due to the glitch, I would doubt people would ultimately be liable for it.
