- Incorrect deductions
- Not starting early
- Lying about income
- Trying to avoid paying
Some people realize that they own money to the government and try to avoid paying by simply not filing. This is illegal and you can get in a lot of trouble for doing this.
- Not offsetting stock gains
If you sell a stock for a gain, then you will have to pay taxes. You can balance this out by selling a losing stock and deducting the loss. Most people don't do this though.
- Not adding to retirement savings
Your retirement savings are very important for your future, but beyond that, they can help you save money on your taxes in the short term. Certain retirement funds are tax deferred which means that paying into them will reduce your gross earnings.
- Not submitting all relevant documents
If you are itemizing deductions or have anything on your tax form that would make it stand out, you should make sure that you submit any supporting documents to avoid an audit.
- Withholding too much
Many people have too much money withdrawn for their taxes. Sure, they get a big refund in the spring, but they've given the government an interest-free loan. With a bit of fiscal responsibility, this money could have been earning them interest.
- Not keeping the receipts for your deductions
If you are going to itemize your deductions, you need to make sure that you keep your receipts as proof.
- Math errors
Surprisingly, many returns are flagged for audit each year just because of simple math errors.