I am not a tax professional, but I can provide some general information that may be helpful. It's important to consult with a tax advisor or accountant who is familiar with the specific tax laws in both Texas and California to get accurate advice tailored to your situation.

In general, when it comes to state income taxes, you may be subject to taxation in both Texas and California. Texas does not have a state income tax, so you won't owe any state income tax to Texas on the income earned through your LLC. However, as you will be physically working in California, you may be considered a non-resident for tax purposes and subject to California state income tax on the income earned while working in the state.

California has a concept called "sourcing of income," which determines how income is allocated to the state for tax purposes. Generally, income is sourced to California if it is earned within the state. So, if you are physically present in California while performing the editing services for your Texas-based client, that income may be considered California-sourced income and subject to California state income tax.

It's worth noting that California has a minimum filing requirement for non-residents, which means you may need to file a California state tax return even if you don't owe any tax. This requirement applies if you have any California-sourced income exceeding a certain threshold.

To determine the exact tax implications and any potential exemptions or deductions, it's crucial to consult with a tax professional who can analyze your specific situation and provide accurate advice. They will consider factors such as the nature of your work, the duration of your stay in California, and any applicable tax treaties between the states.

Remember, tax laws can be complex and subject to change, so it's always best to seek professional advice to ensure compliance with all relevant regulations.