Joseph Anthony discussed six signs one does not need a tax pro to file tax:
1. You're not afraid of numbers.
2. You've got a simple return.
3. You understand your own returns.
4. You're good at double-checking.
5. Your life hasn't changed from the previous year.
6. Money is more important to you than time.
I've determind to do my own tax this year: I'm comfortable about numbers, I live in a state with no state tax (Washington) and I spent lots of time in personal finance so I do understand my own returns.