Have a Tax Question? Ask a Tax Expert
You need to file for every year that you have missed. Your ex-spouse uses the alimony as a deduction so you will have to account for it as income.
I suggest that you get a tax preparer to help you with the forms and the filing.
If your only income is alimony, you will probably owe some tax. If you do, you can request a payment plan. Your tax preparer can help you with this paperwork as well.
Let me know if you still have questions.