Boulder Chamber of Commerce

Boulder County Colorado

Colorado Bar Association

Colorado Department of Revenue

Colorado Secretary of State

Colorado Secretary of State - Conducting Business

Colorado Secretary of State - Type of Business

Colorado Society of Certified Public Accountants

Internal Revenue Service

Social Security Administration

State of Colorado

Tax and Accounting Sites

Colorado Dept. of Revenue General 14

Opening a Business in Colorado

Colorado Dept. of Revenue Income 44

State Tuition Program Contribution Subtractions & Income 51 Estimated Income Tax

Colorado Dept. of Revenue Sales 9

Sales Tax Licenses and Filing Requirements

IRS Publication 463

Travel, Entertainment, Gift, and Car Expenses

IRS Publication 505

Tax Withholding and Estimated Tax

IRS Publication 583

Starting a Business and Keeping Records

IRS Publication 587

Business Use of Your Home

Social Security Administration

How You Earn Credits

State of Colorado - Bookkeeping

State of Colorado - Income & Property Tax

State of Colorado - Starting a Business Checklist