Multistate Taxation: What You Need to Know in 2023

If you live, work, or do business in multiple states, your income may be subject to the taxation requirements of various jurisdictions.

This can get complex and confusing very quickly.

For example, how do you determine your state income taxes if your income comes from more than one state?

Or, let’s say you own a business you registered in one state but which operates in others — and each state has its own payroll withholding requirements. How do you withhold from an individual employee’s paycheck?

What if that employee lives in yet another state?

The rising popularity of hybrid and remote work has made these questions more pertinent than ever in the new year. That’s why employees and employers who generate income in more than one state must understand the potential pitfalls that could lead to costly tax mistakes.

We’ll explore the basics of multistate taxation, types of multistate taxes, and strategies for managing taxes in multiple states.

What is multistate taxation?

Each state has the right to impose individual and corporate income taxes on businesses, not to mention general sales taxes, excise taxes, property taxes, license taxes, and more.

To make matters even more confounding, the nature of these different types of taxes can also vary. While most states charge a flat income tax rate anywhere from 1% to 10%, some use a progressive marginal tax, and others have a state alternative minimum tax.

Furthermore, taxable income liability state-by-state may differ from the total income tax on the federal level. You also need to apportion taxable income and deductions to the correct state based on the amount of business done in that state.

You’re not alone! 48% of employers cite multistate payroll taxes as a significant or growing concern for their organization. The process of accurately calculating and paying taxes to multiple states while remaining in compliance with different laws and regulations can be complicated and time-consuming. This includes understanding the various tax rates, filing requirements, and payment deadlines.

Another significant wrinkle: What constitutes doing business in a given state?

Previously on this blog, we have discussed the concept of “nexus,” used by states to determine when an out-of-state entity has a sufficient financial connection to their state to trigger the application of state tax laws.

Suppose you sell goods or services to customers across state lines, such as through an e-commerce business, out-of-state vendor, or other entity like a corporation or partnership connected to another taxing jurisdiction. In that case, you must understand nexus if you want to avoid being audited by other states or territories — so take a look at our article on the subject for a deeper dive.

How do you manage multistate taxation?

The key question (which is by no means simple to answer) you should ask is this:

How much do I owe in each state?

The first step in answering this question is critical for any complex tax return: diligent record-keeping and top-notch organization.

Can you be taxed in multiple states on the same income?

In many states, you must pay tax on all income earned during the tax year — from all sources. Generally, however, you get a tax credit for taxes paid to other states. Putting it another way: if you receive income from your business operations in a state where you don’t live, you may have to pay taxes in both states, but your home state will give you a tax credit toward the tax you paid in the other state.

We’ll touch on this point again shortly, but first, there is a key concept you need to understand: reciprocity.

What is a reciprocal tax agreement between states?

A state reciprocal agreement, or reciprocity, is an agreement in which two states allow a resident of one state only to pay taxes where they live while requesting an exemption from tax withholding in the other (reciprocal) state — for example, a state where they work.

For example, if you live in North Dakota but work in Montana (two states with reciprocity), you can request that your employer stop withholding Montana taxes. Then, you would only have to file a North Dakota return due to the reciprocal agreement.

For those who live in one state but work in another, this can save you the significant inconvenience of filing returns in multiple states.

The following states have reciprocal tax agreements: