Morgan explained that the better approach is simple. Read the notice first.
Most IRS letters are explaining a mismatch between what was reported on your tax return and data they received from other sources. Once you understand the issue, the next step is sending the notice to your CPA or tax professional so they can help interpret it.
The final step is simple but important. Pay attention to the response deadline and take action before it expires.
Clarity and timing solve most of these situations.