Every year, millions of Americans miss tax deadlines, whether they're filing late, paying late or both. For some, it's a matter of limited cash flow. For others, it's confusion around changing tax rules or delays in getting their tax documents together. Whatever the cause, though, if you miss the April 15 tax deadline, it doesn't just mean you're filing late. It can also trigger a chain reaction that can make an already difficult situation more expensive and stressful.  And unlike many other