You’ll need complete financial documentation including bank statements, pay stubs, monthly expense records, and asset valuations. The IRS requires three months of bank statements and proof of all income sources, including wages, self-employment, rental income, and government benefits. For Offers in Compromise, you’ll also need Form 433-A (individuals) or Form 433-B (businesses), which detail your complete financial picture. Asset documentation includes vehicle titles, property deeds, retirement account statements, and business valuations if applicable. Tax compliance is mandatory – all required returns must be filed before applying. If you have unfiled returns, that becomes the first priority. Missing even one required return will result in automatic application rejection, regardless of your financial situation.