Should Married Couples File Taxes Jointly or Separately in Colorado?
Mike Nekoorad • January 13, 2026

Tax season brings an important decision for married couples: should you file your taxes jointly or separately? While most married couples file jointly, there are situations where filing separately might make financial sense. Understanding the advantages and disadvantages of each filing status can help you make the best choice for your family's financial situation.

This decision isn't just about federal taxes. In Colorado, your filing status also affects your state tax return and can have implications for various credits and deductions. Let's explore both options to help you determine which filing status is right for you.

Understanding Your Filing Status Options

Once you're married, you have two filing status options for your federal and Colorado state tax returns:

Married Filing Jointly (MFJ): You and your spouse combine your income, deductions, and credits on a single tax return.

Married Filing Separately (MFS): You and your spouse each file your own individual tax return, reporting only your own income, deductions, and credits.

It's important to note that if you're married, you cannot use the Single filing status. Even if you lived apart for the entire year, your options are limited to married filing jointly or married filing separately.

The Case for Filing Jointly

For most married couples, filing jointly offers the greatest tax benefits. Here's why the majority of married couples choose this option:

Advantages of Married Filing Jointly

Lower Tax Rates and Higher Income Thresholds

When you file jointly, you benefit from more favorable tax brackets. The income thresholds for each tax bracket are generally wider for married filing jointly than for married filing separately, meaning more of your income is taxed at lower rates.

For example, in 2025, the 22% federal tax bracket for married filing jointly applies to taxable income between $94,300 and $201,050, while for married filing separately, this same bracket applies to income between $47,150 and $100,525. Filing jointly essentially doubles the income threshold, potentially keeping more of your combined income in lower tax brackets.

Higher Standard Deduction

The standard deduction for married filing jointly is significantly higher than for married filing separately. For 2025, the standard deduction is $30,000 for married couples filing jointly, compared to only $15,000 for those filing separately. This means you can shelter more income from taxation when filing jointly.

Access to More Tax Credits

Many valuable tax credits are either unavailable or severely limited when filing separately. These include:

  • Earned Income Tax Credit (EITC): Not available when filing separately
  • Child and Dependent Care Credit: Not available when filing separately
  • Education Credits (American Opportunity and Lifetime Learning Credits): Not available when filing separately
  • Adoption Credit: Not available when filing separately
  • Premium Tax Credit for health insurance: Generally not available when filing separately

Retirement Contribution Benefits

Filing jointly provides more flexibility for retirement planning. If one spouse has little or no earned income, filing jointly allows that spouse to contribute to a spousal IRA. Additionally, income limits for Roth IRA contributions are much higher for married filing jointly than for married filing separately.

Simplified Filing Process

Filing one joint return is simpler and less time-consuming than preparing two separate returns. You only need to track one set of documents, work with one tax return, and keep records for one filing.

Colorado-Specific Benefits of Filing Jointly

Colorado is one of many states that follows federal guidelines for most tax provisions. When you file jointly on your federal return, you'll also file jointly on your Colorado state return. Benefits include:

  • Higher income thresholds before phasing out of state tax benefits
  • Simplified state tax preparation
  • Better treatment of Colorado state tax credits and deductions
  • Potential for lower overall state tax liability

When Filing Separately Might Make Sense

Despite the many advantages of filing jointly, there are specific situations where married filing separately could be beneficial:

Situations Where Separate Filing May Be Advantageous

Significant Medical Expenses for One Spouse

Medical expenses are only deductible to the extent they exceed 7.5% of your adjusted gross income (AGI). If one spouse has substantial medical expenses and significantly lower income, filing separately could make more of those expenses deductible.

For example, if one spouse has $15,000 in medical expenses and earns $40,000, while the other spouse earns $150,000, filing separately might allow the lower-earning spouse to deduct more medical expenses since the 7.5% AGI threshold would be calculated on $40,000 rather than $190,000.

Income-Driven Student Loan Repayment Plans

If one spouse has significant student loan debt and is on an income-driven repayment plan, filing separately might result in lower monthly loan payments. These plans calculate payments based on AGI, and filing separately could keep that spouse's payment amount lower.

However, you need to carefully calculate whether the tax savings from filing jointly outweigh the savings on student loan payments. In many cases, the tax benefits of joint filing exceed the student loan payment savings.

Separation or Divorce in Progress

If you're legally separated or in the process of divorcing, filing separately may be appropriate, especially if there's financial uncertainty about your spouse's income or deductions. This protects you from potential liability for your spouse's tax issues.

Concerns About Spouse's Tax Compliance

When you file jointly, both spouses are jointly and severally liable for the entire tax liability, including any penalties and interest. If you have concerns about your spouse's honesty on the tax return, or if they have ongoing tax problems, filing separately protects you from liability for their tax issues.

Itemizing Deductions When One Spouse Has High Deductible Expenses

In some cases, if one spouse has significant itemizable deductions (such as large charitable contributions, state and local taxes, or mortgage interest) and lower income, filing separately might result in a larger combined deduction. However, there's a catch: if one spouse itemizes when filing separately, the other spouse must also itemize and cannot take the standard deduction.

Disadvantages of Filing Separately

Before choosing to file separately, carefully consider these significant drawbacks:

Higher Tax Rates

Tax brackets for married filing separately are less favorable, potentially pushing more of your income into higher tax brackets.

Loss of Valuable Credits

As mentioned earlier, you'll lose access to several important tax credits, including education credits, the Earned Income Tax Credit, and the Child and Dependent Care Credit.

Reduced or Eliminated Deductions

Several deductions are reduced or eliminated when filing separately:

  • Student loan interest deduction is not available
  • IRA contribution deduction may be limited or eliminated
  • Capital loss deduction is limited to $1,500 (instead of $3,000)

Lower Income Thresholds for Phaseouts

Income limits for various tax benefits are much lower when filing separately, meaning you may lose eligibility for benefits at lower income levels.

Both Must Itemize or Both Must Take Standard Deduction

If you file separately and one spouse itemizes deductions, the other spouse must also itemize, even if the standard deduction would be more beneficial. This can result in losing out on valuable deductions.

Complexity and Cost

Preparing two separate tax returns is more time-consuming and may result in higher tax preparation fees if you use a professional.

Colorado State Tax Considerations

Colorado has a flat income tax rate of 4.40% for 2025, which simplifies some calculations but doesn't eliminate the need to carefully consider your filing status.

Colorado-Specific Factors

  • State Credits and Deductions: Colorado offers various state tax credits and deductions, many of which follow federal rules. Filing separately may limit your ability to claim certain Colorado-specific benefits.
  • TABOR Refunds: Colorado's Taxpayer Bill of Rights (TABOR) occasionally results in refunds to taxpayers. Your filing status can affect how these refunds are calculated and distributed.
  • Local Tax Considerations: While Colorado doesn't have local income taxes in most areas, your filing status can affect property tax credits and other local benefits available to Colorado residents.

How to Decide Which Filing Status Is Right for You

Making the right choice requires careful analysis of your specific situation. Here's how to approach the decision:

Step 1: Calculate Both Scenarios

The most reliable way to determine which filing status is better is to actually prepare your taxes both ways and compare the results. Many tax software programs allow you to easily compare married filing jointly versus married filing separately.

Step 2: Consider All Factors

Look beyond just the immediate tax bill. Consider:

  • Tax liability for both federal and Colorado state returns
  • Eligibility for tax credits and deductions
  • Impact on student loan payments (if applicable)
  • Retirement contribution limits and benefits
  • Potential audit risk or liability concerns
  • Long-term financial planning implications

Step 3: Factor in Life Changes

Consider any major life changes that occurred during the tax year:

  • Birth or adoption of children
  • Major medical expenses
  • Job changes or income fluctuations
  • Homeownership or moves
  • Education expenses
  • Student loan repayment plans

Step 4: Consult a Tax Professional

Given the complexity of tax law and the numerous factors involved, consulting with a qualified tax professional can help ensure you're making the best decision for your situation. They can run detailed calculations and identify tax-saving opportunities you might miss.

Special Situations to Consider

Community Property States

Colorado is not a community property state, which simplifies matters somewhat. In community property states, income earned by either spouse is generally considered owned equally by both, which affects how income is allocated when filing separately. Colorado follows common law property rules, making separate filing calculations more straightforward.

Part-Year Residents

If you or your spouse moved to or from Colorado during the tax year, your filing status decision becomes more complex. You may need to file part-year resident returns, and the tax implications can vary significantly based on your filing status.

Multiple State Returns

If you and your spouse work in different states or have income from multiple states, filing separately might create complications for state tax returns. Carefully consider how your filing status affects each state return.

Common Mistakes to Avoid

  • Assuming Separate Filing Is Always Worse: While joint filing is usually better, there are legitimate situations where separate filing makes sense. Don't dismiss it without doing the calculations.
  • Forgetting About State Tax Implications: Don't focus solely on federal taxes. Your Colorado state tax liability matters too, and your filing status affects both returns.
  • Not Considering the Full Picture: Look beyond just the current year's tax bill. Consider how your filing status affects retirement contributions, financial aid eligibility, and other long-term financial factors.
  • Switching Filing Status Without Careful Analysis: If you've always filed jointly, don't switch to separate filing without thoroughly analyzing the implications. Similarly, if you've filed separately, regularly reassess whether joint filing might now be more beneficial.
  • Missing the Deadline for Amendments: If you file jointly and later realize separate filing would have been better (or vice versa), you generally have three years to amend your return. Don't miss this window.

The Bottom Line

For most married couples in Colorado, filing jointly provides the greatest tax benefits and the simplest filing process. The higher standard deduction, more favorable tax brackets, and access to valuable tax credits typically make joint filing the clear winner.

However, certain situations like significant medical expenses, income-driven student loan payments, or concerns about a spouse's tax compliance may warrant separate filing. The key is to carefully analyze your specific situation, ideally by preparing your taxes both ways and comparing the results.

Remember that tax law is complex and constantly changing. What makes sense one year might not be optimal the next. Regularly reassess your filing status decision, especially when significant life changes occur.

How Colorado Financial Advisors Can Help

At Colorado Financial Advisors, we understand that tax planning is a crucial component of your overall financial strategy. Since 1990, we've been helping Colorado families make informed financial decisions that support their long-term goals.

While we're not tax preparers or CPAs, our comprehensive approach to financial planning means we consider how tax decisions fit into your broader financial picture. We work closely with your tax professionals to ensure your investment strategy, retirement planning, and other financial decisions are tax-efficient and aligned with your goals.

Our services include:

  • Comprehensive financial planning that considers tax implications
  • Retirement planning strategies to help optimize your tax situation
  • Fee-based investment management with attention to tax efficiency
  • Coordination with your tax professionals for holistic financial guidance

We believe in building strong relationships with our clients and providing independent, sound advice tailored to your unique situation. Whether you're navigating complex tax decisions, planning for retirement, or working toward any financial goal, we're here to help.

Take the Next Step

Making smart decisions about your filing status is just one piece of your overall financial puzzle. If you're looking for comprehensive financial guidance that considers all aspects of your financial life, we invite you to contact Colorado Financial Advisors today.

Schedule a consultation to discuss your financial situation, goals, and concerns. We'll take the time to understand your unique circumstances and provide the personalized guidance you need to make confident financial decisions.

Your financial future matters, and having experienced professionals on your side can make all the difference. Let us help you navigate the complexities of financial planning and work toward achieving independent wealth.

Contact Colorado Financial Advisors today to get started.

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