Tax Center
Plain answers to federal, Colorado and Denver tax questions, the deadlines that matter and what to gather before you meet with your CPA. Every figure is checked against IRS and Colorado Department of Revenue sources and dated.
Next deadlines
- Fourth-quarter 2026 estimated tax payment
- W-2s and 1099-NECs due (Jan 31 falls on a Sunday)
- S corporation and partnership returns (Forms 1120-S and 1065) due
- Individual and calendar-year C corporation returns due; first-quarter 2027 estimate
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Tax Center2026 Federal Income Tax Brackets and Standard Deduction
For 2026, federal income tax rates run from 10% to 37%, and the standard deduction is $16,100 for single filers, $32,200 for married couples filing jointly and $24,150 for heads of household.
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Tax CenterHow Long to Keep Tax Records: Business and Personal
Keep the records that support a federal tax return for at least three years after filing, which is the IRS's general period for assessing additional tax.
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Tax Center2026–2027 Tax Deadlines: Federal and Colorado
For the 2026 tax year, W-2s and 1099-NECs are due February 1, 2027, partnership and S corporation returns March 15, 2027, and individual, C corporation and Colorado individual returns April 15, 2027.
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Tax CenterColorado Income Tax: What Denver Residents Need to Know
Colorado taxes individual income at a flat 4.4%, the rate in effect for 2025 and the rate used in the state's 2026 estimated tax worksheet.
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Common Tax Questions, Answered
Most Colorado residents who must file a federal return must also file a Colorado return, and you should file on time even if you cannot pay, because the federal late-filing penalty is ten times the late-payment penalty.
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Tax CenterDenver Business Taxes: What Owners Need to Know
A Denver business deals with three layers of tax beyond federal income tax.
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Tax Preparation Checklist: What to Bring to Your CPA
Bring last year's returns, every income form you receive (W-2s, 1099s, K-1s), records of deductible expenses and estimated payments, and, if you own a business, a year-end profit and loss statement, balance sheet and payroll reports.
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