The government does tell you the information it has. Most people don’t realize this and therefore aren’t optimizing their taxes, but it is a trick known by acco

The government does tell you the information it has. Most people don’t realize this and therefore aren’t optimizing their taxes, but it is a trick known by accountants. Each year, you should file an extension and then wait for your IRS to publish its transcript (in May I believe) that shows all the wage/income and other info the IRS has on you.