June 15th arrives faster than most Colorado business owners expect, and with it comes the second quarterly estimated tax deadline. If you’re self-employed in the Castle Rock area or anywhere across the Denver Metro region, this date should be circled on your calendar in red ink.

Whether you’re running a consulting business from your home office in Littleton or operating a food truck in downtown Denver, understanding estimated taxes isn’t just good business practice—it’s essential for avoiding costly penalties and managing your cash flow effectively.

What Are Estimated Taxes and Who Needs to Pay Them?

Estimated taxes are quarterly payments made to both the IRS and Colorado Department of Revenue throughout the year. Unlike traditional employees who have taxes withheld from each paycheck, self-employed individuals must proactively calculate and submit these payments.

You’ll likely need to make estimated tax payments if you expect to owe $1,000 or more in federal taxes when you file your return, or if you had a tax liability last year and expect to owe Colorado taxes this year. This applies to freelancers, independent contractors, small business owners, and anyone with significant income from sources other than traditional employment.

Many Colorado entrepreneurs we work with in Parker and Centennial initially underestimate this responsibility. The key is staying ahead of the game rather than scrambling at year-end.

The Q2 Deadline: June 15th Each Year

The second quarter estimated tax payment covers income earned from April through May. Mark these quarterly deadlines on your calendar each year:

  • Q1: April 15th For income earned from January 1 to March 31.
  • Q2: June 15th For income earned from April 1 to May 31.
  • Q3: September 15th For income earned from June 1 to August 31.
  • Q4: January 15th  For income earned from September 1 to December 31 of the previous year.

Colorado-Specific Considerations

Colorado requires estimated tax payments if you expect to owe more than $1,000 in state taxes for the current year. The good news? Colorado’s tax calculation follows your federal adjusted gross income, making the process more straightforward than some other states.

For Aurora and Denver-based businesses, remember that you may also have local tax obligations depending on your business structure and location.

Calculating Your Q2 Payment

The safest approach is paying 25% of last year’s total tax liability each quarter. This “safe harbor” rule protects you from underpayment penalties even if your income increases significantly.

However, if your income varies throughout the year—common for seasonal businesses or those with fluctuating contract work—you might benefit from the annualized income installment method. This approach allows you to base payments on actual quarterly earnings rather than equal quarterly amounts.

For example, a tax professional in Colorado Springs who earns most of their income during tax season might pay larger amounts in Q1 and Q2, with smaller payments later in the year.

Payment Methods and Timing

Both the IRS and Colorado offer multiple payment options:

  • Online payments through official websites
  • Phone payments
  • Mailing checks (ensure they’re postmarked by the deadline)
  • Electronic Federal Tax Payment System (EFTPS)

Pro tip: Set up automatic payments to avoid missing deadlines. Many Castle Rock business owners we assist find this eliminates the stress of remembering quarterly dates.

Common Mistakes to Avoid

Don’t wait until the last minute to calculate your payment. Tax situations can be complex, especially if you have multiple income streams or significant business expenses.

Another frequent error is forgetting about self-employment tax. This covers Social Security and Medicare taxes that employers typically handle for traditional employees. For 2024, self-employment tax sits at 15.3% on net earnings up to the Social Security wage base.

Many entrepreneurs also overlook quarterly state payments, focusing solely on federal obligations. Both are equally important for staying compliant.

When Professional Help Makes Sense

If you’re juggling estimated taxes alongside running your business, professional tax planning and preparation services can provide peace of mind and potentially save money through proper planning.

This is especially valuable if you’re scaling your business, dealing with equipment purchases, or managing employees. Speaking of employees, transitioning from contractor payments to formal payroll involves additional tax considerations that benefit from professional guidance.

Planning Beyond Q2

Once you’ve handled your June 15th payment, start preparing for Q3. Review your year-to-date income and expenses, and adjust future payments if necessary. This ongoing approach prevents year-end surprises and helps with cash flow management.

Consider setting aside 25-30% of each payment you receive throughout the year in a separate tax account. This simple habit ensures funds are available when quarterly deadlines arrive.

Managing estimated taxes doesn’t have to feel overwhelming. Whether you’re a established business in the Denver Metro area or just starting your entrepreneurial journey in Colorado Springs, staying organized and planning ahead makes all the difference. If you’d like guidance tailored to your specific situation, we’d be happy to discuss your tax planning needs during a complimentary consultation.