Guide
Free tax and registration forms
Official PDFs from the IRS and the Illinois Department of Revenue, linked to the Flipfiled guide that explains each one.
General information only, not legal or tax advice. I am not a lawyer, a CPA or an accountant. Flipfiled does not prepare tax returns or give legal advice. This page explains what the IRS says a form is. It does not tell you how your own taxes should be reported.
How to use this page
These are free, public forms from the IRS and the Illinois Department of Revenue. The links go straight to the government’s own site, so you always get the current version (forms change, and an old copy can be out of date). Download one, read its instructions, and fill it out yourself.
If a form feels intimidating, I can help with administrative paperwork like the ones marked “Clerical help” below. You enter your own SSN, taxpayer ID and signature yourself. I never collect them. I do not prepare tax returns, and I do not give tax or legal advice. For tax return forms, talk to a CPA or enrolled agent.
Registration and administrative forms
| Form | What it is | Guide | Help |
|---|---|---|---|
| CRT-61, Certificate of Resale (opens in a new tab) | Illinois Department of Revenue. You give it to a supplier so you can buy items for resale without paying sales tax on them. | CRT-61 guide | Clerical help |
| CRT-61 Instructions (opens in a new tab) | Illinois Department of Revenue. | CRT-61 guide | — |
| IRS online EIN assistant (opens in a new tab) | IRS. The online application for an Employer Identification Number. No paper form needed. | How to get an EIN | Clerical help |
| ST-1 Instructions (Sales and Use Tax and E911 Surcharge Return) (opens in a new tab) | Illinois Department of Revenue. The return is normally filed online; the instructions explain it. | Sales tax registration | Clerical help |
| Form W-9, Request for Taxpayer Identification Number and Certification (opens in a new tab) | IRS. Given to a business that asks for your taxpayer ID. You enter your own number and sign it. | Bank account guide | Clerical help |
Tax return and tax election forms (for information only)
These affect how your business is taxed. Flipfiled does not prepare them or advise on them. They are here so you can see what they look like and bring them to a CPA.
| Form | What it is | Guide | Help |
|---|---|---|---|
| Schedule C (Form 1040), Profit or Loss From Business (opens in a new tab) | IRS. A tax return form. | Business expenses | CPA |
| Instructions for Schedule C (opens in a new tab) | Business expenses | CPA | |
| Form 1065, U.S. Return of Partnership Income (opens in a new tab) | IRS. A tax return form. | Schedule K-1 explained | CPA |
| Instructions for Form 1065 (opens in a new tab) | Schedule K-1 explained | CPA | |
| Schedule K-1 (Form 1065), Partner’s Share of Income, Deductions, Credits, etc. (opens in a new tab) | IRS. A partnership gives this to each partner. | Schedule K-1 explained | CPA |
| Partner’s Instructions for Schedule K-1 (Form 1065) (opens in a new tab) | IRS. | Schedule K-1 explained | CPA |
| Form 8832, Entity Classification Election (opens in a new tab) | IRS. Used by some LLCs to choose how they are taxed. | S corp vs LLC | CPA |
| Form 2553, Election by a Small Business Corporation (opens in a new tab) | IRS. The S corporation election. | S corp vs LLC | CPA |
Where to find other forms
- IRS: forms and instructions (opens in a new tab).
- Illinois Department of Revenue: business registration forms (opens in a new tab) and sales and use tax forms (opens in a new tab).
- Illinois Secretary of State: business services (opens in a new tab) (LLC filings are normally done online).
I am not a lawyer or a CPA
Flipfiled is a clerical and administrative filing-assistance service. I am not a lawyer, a CPA or an accountant. I do not prepare tax returns, give tax advice or give legal advice, and nothing on this site is advice. Form links were collected Oct 30, 2026. Always confirm on the agency’s site that you have the current version.
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