Written By Caitlin See
Updated on September 24, 2025
Filing taxes separately is already nuanced, and living in a community property state only adds to the complexity. Understanding how state community property laws and the IRS treat household income and tax deductions is key to avoiding costly mistakes and maximizing student loan repayment when married filing separately (MFS).
What is a community property state?
Community property states generally treat income earned and assets acquired during marriage as jointly owned property. This includes wages and salaries — even if only one spouse is working — as well as investment earnings and rental income from property acquired during marriage.
The “community property” designation starts at the date of marriage, the date you establish residency in a community property state or the date you start a registered domestic partnership in select states. There are currently nine community property states, including Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington and Wisconsin. However, income is treated differently depending on which community property state you live in.
Note that several states (e.g., Alaska, South Dakota and Tennessee) allow couples to “opt in” to a community property agreement for asset titling purposes. However, these states are treated as non-community property states when filing taxes. Therefore, you aren’t able to split your income when married filing separately just because you opt in.
How married filing separately works in community property states
When you file taxes separately in a community property state, you’ll need to determine if income is produced from community property or separate property.
Community property laws determine what income is reportable to each spouse. They fall into two characterization categories:
- “Spanish rule”. Idaho, Louisiana, Texas and Wisconsin treat income from any property, whether jointly-owned or separately-held, as community property. For example, income from assets acquired before marriage that were never commingled are still split equally between spouses.
- “American rule”. California, Arizona, Nevada, Washington and New Mexico allow income from separately-held property to remain separate. In which case, only the owning spouse reports it on their tax return.
However, there are some instances where IRS rules override how the state’s community property laws normally function. This is referred to as “federal preemption”.
For example, contributions to and distributions from an Individual Retirement Account (IRA) are always treated as separate property — regardless of whether the state follows “Spanish rule” or “American rule”.
Federal preemption also applies to matters of Social Security and Medicare. Social Security benefits, as well as associated FICA taxes, remain separate property no matter where you live.
Additionally, there are scenarios where income from separately-held assets can sometimes be partially treated as community property.
For example, imagine a California city manager who accrues CalPERS pension benefits over a 20-year career. She marries her spouse at the 10-year mark. For tax purposes, how that pension income is divided depends on whether the benefits were accruing before or after marriage — not when distributions are received.
In this case, the first 10 years of pension accrual are considered separate property and the final 10 years are community property. Therefore, when filing separately, 50% of the pension is separate property and the other 50% is community property that needs to be split evenly between the spouses. As a result, the city manager will report 75% of the pension income on their tax return — 50% of their separate property portion plus 50% of their community property portion, which is 25% of the total (50% + 25% = 75%) — while the spouse will report 25%.
Example 1: Splitting community property wages in Texas
Let’s look at an example couple from Texas who are both W-2 employees. Sally earns $50,000 as a teacher and her spouse Janet earns $300,000 as a physician. They’ve been married for five years and like to keep things simple in their relationship. They don’t have a side hustle or other outside income, and they have one joint checking account to manage all of their finances.
Janet carries $350,000 of student loan debt from medical school and is on an income-driven repayment (IDR) plan. Sally took advantage of the Teacher Loan Forgiveness program prior to getting married, so she has no remaining student debt.
If they file a joint tax return, Janet will have to report her household income as $350,000 when renewing her IDR plan. However, if they file taxes separately, they will each report half of their own income and half of their spouse’s income since Texas is a “Spanish rule” community property state. Therefore, Janet will report $175,000 of income and Sally will report $175,000. This will, in turn, substantially reduce Janet’s student loan payments.
Example 2: Factoring in investment income in Texas vs. California
Using the same example of Sally and Janet, let’s say Janet also has a brokerage account that has $250,000 in it. Although she didn’t sell investments this past year, her brokerage account produced $5,000 in dividends. Janet had this brokerage account before getting married, and for simplicity, let’s say she hasn’t added any money to it or taken any money out of it. Therefore, the brokerage account has remained separately-held.
Because they live in Texas (which again follows “Spanish rule”), it doesn’t matter that Janet’s brokerage account has been kept totally separate from their other finances. This dividend income is considered community income. Therefore, Janet and Sally will each report $2,500 of dividends on their respective tax returns and Form 8958 (more on this later).
Now, let’s say Sally and Janet lived in California instead of Texas. Under “American rule”, their dividend income would be treated as separate income because the money was never commingled. Therefore, Janet would report the full $5,000 of dividends on her tax return, and Sally would report no dividends.
How are tax deductions split when married filing separately?
The complexity of filing taxes separately in a community property state doesn’t stop at divvying up income. It also extends to itemized deductions.
When MFS in a community property state, there are two main things you need to know:
- If one spouse itemizes deductions on their tax return, the other spouse must also itemize deductions.
- If community funds (e.g., a joint checking account or an account considered community property under your state laws) are used to pay deductible expenses, then the deduction should generally be split between each of your tax returns.
However, the nuances can vary depending on how your state treats community versus separate property and how the IRS views the transaction. For instance, real property taxes are generally split between both spouses when MFS. However, if the property is only owned by one spouse, they can deduct the full cost of the property taxes even if they were paid using joint funds.
Having a basic understanding of community property laws for your state will help with accurately reporting your income and deductions when married filing separately. For added security, working with SLP Wealth can help ensure you don’t miss out on valuable tax deductions — or accidentally misreport your income or shared expenses when married filing separately in a community property state.
How to use Form 8958 when married filing separately in a community property state
Determining what is considered separate versus joint income is the hardest part of filing an MFS tax return in a community property state. At its most basic level, all community assets (including wages) are split in half. All separate income is reported on the spouse’s tax return who receives that income from separate property. But beyond that, you can utilize Form 8958 to report the allocation of tax amounts to show how the totals on your tax return came to be.
Note Form 8958 has no impact on your actual tax return. Instead, it serves as a ledger, showing how you split different types of income. For example, if we use our investment income example for Janet and Sally from earlier, they would need to detail how they split dividends (e.g., equally in Texas versus separately in California) on Form 8958 in addition to claiming the income on their tax return.
Although Form 8958 is informational in nature, it’s still required by the IRS to help them match each spouse’s tax return to the other to ensure no income items are missing.
Should you file taxes separately in a community property state?
The benefit of filing separately in a community property state is twofold, and sometimes threefold, depending on your situation. You can potentially:
- Avoid added taxes for disparate incomes. Community property laws split income in half between spouses, which can help equalize incomes and create less added taxes from filing separately. Keep in mind that you’ll lose certain tax benefits when MFS, such as the student loan interest deduction, education credits and marketplace health insurance subsidies. So, this strategy doesn’t always result in a lower tax burden or better financial position for everyone.
- Access lower IDR payments for federal student loan borrowers. In community property states, filing separately allows household income to be split equally between spouses, thereby reducing monthly IDR payments.
- Ability to use the “breadwinner loophole”. In a one-borrower household where the borrower is also the higher earner, filing separately in a community property state can be especially strategic. Because income is split evenly, the borrower shifts some of their income to the lower-earning spouse, allowing for lower student loan payments while keeping the household’s overall tax liability similar to filing jointly.
Need help understanding how community property laws impact your taxes and student loan payments? Reach out today! SLP Wealth can help optimize your taxes while delivering comprehensive fiduciary financial planning tailored to your profession and long-term goals.
