What might cause a taxpayer’s return to take longer to process?

There are many reasons your tax return could be taking longer to process than you expected.  Some of the common errors are simple mistakes.  For example, your tax return could be slow to process because of incorrect social security number(s) for any of the joint taxpayers or dependents listed on your return, incorrect address, incorrect bank information (e.g., routing numbers, account numbers), if you use direct deposit.)