[header] How to avoid steep interest and penalties from accumulating on delinquent tax returns [title] Start with the last year you filed taxes. [step] Go back to the last year the irs got your taxes. You'll need figures from that return to fill out those unfiled tax returns. 
[title] Make sure you have all the tax documents the irs does. [step] Go to your local social security office to get copies of all the w-2s , 1099s and other documents for the years you have unfiled tax returns.