If you’re trying to track down past tax documents and other important IRS transcripts, you’re in luck. Tax return transcripts for the current tax year and the prior three years (10 years for account transcripts) are available from the IRS and free. They can be viewed online or sent to your home. They typically serve as acceptable forms of proof of income for loans, mortgages and financial aid.
If you’re looking for other records besides returns, a Freedom of Information Act (FOIA) document request is probably want you need. This is a good place to start if you have past due tax returns that need to be filed or are at odds with the IRS regarding an audit decision.