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//// Tax · Colorado

Colorado 1099 Quarterly Tax

SE income → SE tax + federal + CO 4.4% flat tax → quarterly estimated payment.

Where this fits

🧾 TaxTax StackGoing 1099Freelancers

This tool lives inside Tax Stack + Going 1099 and is most useful for freelancers.

401(k) Limit 2024$23,000
Roth IRA Limit$7,000
S&P 500 Avg Return~10%/yr

Income

Quarterly payment
$4,759
estimated
Annual tax
$19,037
SE + federal + state
Safe harbor
$3,500
prior year ÷ 4
Effective rate
26.4%
of net SE income

Tax breakdown

Self-employment tax$10,173
Federal income tax$6,562
Colorado state tax$2,302
Total annual$19,037
Per quarter$4,759
Per month (set aside)$1,586
1

Net self-employment income

netSE = gross − expenses

= $90,000 − $18,000

= $72,000

2

Self-employment tax (Schedule SE)

SE base = netSE × 92.35%; SE tax = base × 15.3%

= $10,173

SE tax = Social Security (12.4%) + Medicare (2.9%)

3

Adjusted gross income

AGI = netSE − (SE tax × 50%)

= $72,000 − $5,087

= $66,913

The 50% SE deduction compensates for the employer half of FICA

4

Federal income tax

federal = brackets(AGI − standard deduction)

= brackets($66,913 − $14,600)

= $6,562

Taxable income: $52,313 · Standard deduction: $14,600

5

Colorado state tax

= $2,302

Colorado has a flat 4.4% state income tax.

6

Quarterly payment

quarterly = totalAnnualTax ÷ 4

= $19,037 ÷ 4

= $4,759

IRS Form 1040-ES due: April 15, June 15, September 15, January 15

Key insight

Colorado has a flat 4.4% state income tax. Pay quarterly by: April 15 (Q1), June 15 (Q2), September 15 (Q3), January 15 (Q4). Underpaying triggers a penalty (~8% annualized on the shortfall). When in doubt, pay the safe harbor amount.

Use this result in →

📅Quarterly Tax Calculator💸Self-Employment Tax

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