The boxes are unpacked. The lease is signed, the new coffee shop knows your order, and your driver's license has a fresh address. Then, the following spring, you get a letter from the state you left. It doesn't say goodbye. It asks where its share of your income is.

Nobody warns freelancers about this. At a W-2 job, payroll software quietly splits your withholding between states and an accountant sorts out the rest. When you work for yourself, you are the payroll department. And the uncomfortable truth is that moving doesn't close one tax chapter and open another. For the year you move, two states can each have a legitimate claim on your income.

The federal side doesn't care that you moved

Start with the part that stays simple. Your federal estimated tax payments don't change when you change addresses. The Form 1040-ES schedule, the safe harbor rules, and the self-employment tax all work exactly as they did before. The IRS has one version of you, and your zip code isn't an input.

The trouble is entirely at the state level, because states don't coordinate with each other. Each one runs its own definition of who owes it money.

Residency is a legal idea, not a mailing address

Two terms do most of the work here, and people mix them up constantly.

Domicile is your permanent home: the place you intend to return to and stay. You can have only one domicile at a time. Residency is a looser concept, and the rules vary by state. Many states treat you as a resident if you are domiciled there. Some also use a statutory test. New York, for example, can treat you as a resident if you keep a permanent place to live there and spend more than 183 days in the state during the year, even if your domicile is elsewhere.

This matters because a move rarely happens on a single day. You might sign the new lease in March, ship your things in April, keep the old apartment through June, and change your voter registration in August. When did you change domicile? States look at the whole pattern: where your driver's license, voter registration, and bank accounts are, where your family lives, and where you spend your time. If you leave a thin paper trail, the state you left may argue you never really left.

What "part-year resident" actually means

If you genuinely moved mid-year, you will generally file as a part-year resident in both states. The usual logic is:

  • The state you left taxes all your income while you were a resident, plus any income sourced to that state after you left.
  • The state you moved to taxes all your income from the date you became a resident, plus any income sourced there before you arrived.

In a clean move, the two periods don't overlap and each state taxes its own slice. The details of how you split the year (by days, by months, or by when income was actually received) vary by state and by form. That is where freelancers get tripped up.

Why freelance income is slippery to assign

A W-2 employee has paychecks stamped with dates and a work location. You have invoices, retainers, and payments that land weeks after the work was done.

Two questions decide which slice a dollar belongs to:

  1. When is it income? If you're a cash-basis taxpayer, which most freelancers are, income generally counts when you receive it. A client who pays in January for work you did in November while living in your old state creates an awkward situation. The work happened in one state, and the money arrived in another.
  2. Where is it sourced? States disagree on where a service is performed. Many source service income to where you physically do the work. Others use market-based sourcing, which looks to where the customer receives the benefit. A designer who moves from one state to another but keeps the same clients could be taxed under two different theories about the same invoice.

The practical consequence is that your records need to answer a question you've never had to ask before: on which date, and in which state, did this money become mine?

The relief valve: credit for taxes paid to another state

Here is the reassuring part. States know double taxation is unfair, and most give a credit for income tax paid to another state on the same income. It is typically claimed on your resident-state return and is usually limited to the amount your resident state would have charged on that income. It doesn't make the overlap disappear, but it keeps you from paying full price twice.

Credits have limits. They depend on both states taxing the same income, they need documentation, and they don't help when you simply have the wrong split between the two returns. That is why the cleanup work matters more than the credit.

The estimated payment trap

The quiet danger is that state estimated taxes don't follow you. If you paid your old state quarterly and then moved somewhere that also has an income tax, the new state doesn't know you exist. No voucher arrives and no reminder is sent. You can make Q1 and Q2 payments to a state you left, skip Q3 and Q4 for a state you joined, and discover at filing time that you underpaid one while overpaying the other.

Overpayments to the old state aren't lost, since they come back as a refund or credit on its part-year return. But you will have funded one state's budget while the other charges you underpayment interest. Moving to a state with no income tax can also be misleading. The state you left may still tax the months you lived there.

Your next moves

  • Write down your move date and your domicile date today. They may be different. Note the day you signed the lease, the day you stopped living in the old place, and the day you updated your license, voter registration, and mailing address. Keep this one-page timeline with your tax records.
  • Split your income by date received. Export your payments (bank, Stripe, PayPal) and label each one as before or after your move. Note any invoice for work done in one state but paid while you lived in the other.
  • Check both states' estimated tax rules this week. Look up each state revenue department's page on estimated payments. Find out whether the new state requires you to start paying now, and whether the old state wants a final-period payment.
  • Stop or adjust the old state's payments. If you have recurring payments scheduled to the state you left, change them so you aren't paying on income that now belongs to the other state.
  • Tell your clients where you live now. Update the address on your W-9 and your invoices so that any 1099-NEC you receive in January matches your real location. Mismatches create the kind of letters you don't want.
  • Put "part-year resident" on your filing checklist. When you or your preparer file, expect two state returns and look for the credit for taxes paid to another state on the resident return.

Where Payday fits in

The difficulty of a mid-year move is that the answer lives in your transaction history: which payments arrived in which state, and what you've already paid toward each. Payday connects to Stripe or your bank, calculates your quarterly estimates, and nudges you before each deadline, so the dated record you need for a part-year return is already assembled instead of rebuilt in April. If you'd like one less thing to reconstruct after your next move, you can see how it works at payday.lumenlabs.works.