A few "must knows" for taxpayers to learn before starting the Free File Fillable Forms program. We have provided sample letters that you can use to request waivers of several different types of IRS penalties.In addition, you must furnish a new Form W-9 if the name or TIN changes for the account, for example, if the grantor of a grantor trust dies. Use Form W9 to provide your correct Taxpayer Identification Number (TIN) to the person who is required to file an information return with the IRS. Can I file my personal income taxes through this site? How do I get started? Fill in your actual or estimated adjusted gross income for the year you wrote in the "tax year" box. Use Form W9 to provide your correct Taxpayer Identification Number (TIN) to the person who is required to file an information return with the IRS. Follow the prompts to request the IRS. In general, in a manager-managed LLC that has no operating agreement, each manager.