Multi-State Sales Tax · For Ecommerce Sellers

You grew across state lines. Now make sure your sales tax footprint caught up.

I help Shopify, Amazon, and direct-to-consumer sellers review where they may have sales tax nexus, decide where registration makes sense, and complete the state registration process with a clean filing calendar.

This is built for sellers who want practical CPA-led help, not another software subscription. Registration, account setup, filing-frequency tracking, and a clean handoff in one focused project.

Book a free 15-min nexus assessment →

No commitment · CPA-led · Typical project timeline 2–3 weeks after document collection

01 / When this matters

Sales tax registration usually becomes urgent after one of these trigger events.

SIGNAL 01

You have meaningful sales outside your home state

Many states use economic nexus rules based on sales, transactions, or both. If you are selling nationally through Shopify, WooCommerce, Amazon, Walmart, Etsy, or your own site, your registration footprint may no longer match where your customers are.

SIGNAL 02

You sell through both marketplaces and your own site

Marketplace facilitator rules can simplify collection on marketplace sales, but they do not automatically resolve your own-site sales, inventory facts, account setup, exemption handling, or every state registration question.

SIGNAL 03

You store inventory through FBA or third-party logistics

Inventory stored in a state can create a different fact pattern from purely remote sales. The right answer depends on where inventory sits, what channels you sell through, and how each state treats your activity.

SIGNAL 04

You received a state notice, questionnaire, or inquiry

State correspondence should not be ignored or answered casually. The first step is to understand what the state is asking, whether prior-period exposure exists, and whether registration alone is enough.

SIGNAL 05

A buyer, lender, investor, or underwriter is reviewing the business

Sales tax exposure is a common diligence issue for ecommerce companies. A clear nexus review, registration history, and filing calendar can make the business easier to explain during a transaction or financing process.

SIGNAL 06

Your income tax CPA does not handle multi-state sales tax

Many CPAs are excellent income tax advisors but do not want to manage sales tax registrations across multiple states. This service is designed to work alongside your existing CPA, not replace them.

02 / What you get

A focused registration project with a clean handoff.

The goal is not to create a complicated tax department. The goal is to identify likely registration obligations, register in the agreed-upon states, and leave you with the information needed to collect, file, and stay organized going forward.

Initial sales tax footprint review

Free assessment call

We review your sales channels, approximate sales-by-state, current registrations, inventory facts, marketplace activity, and any state correspondence. You leave with a practical view of where the issue likely sits and whether a paid registration project makes sense.

Written nexus and registration plan

After engagement

You receive a written summary of the states reviewed, states recommended for registration, states to monitor, and any areas that may require a separate prior-period exposure review or specialist support.

Document collection and state applications

Client intake + state portals

I collect formation details, EIN information, responsible-party information, platform data, existing account details, and any required authorization forms. Then I prepare and submit the agreed-upon state registration applications.

Permit tracking and issue resolution

Typical timeline 2–3 weeks

Some states issue quickly. Others ask follow-up questions or take longer to process. I track each application, respond to routine portal issues, and keep you updated until the registrations are complete.

Final registration packet and filing calendar

On delivery

You receive permit numbers, account details, filing frequencies, portal access notes, registration effective dates, and a 24-month filing calendar so you know what has to happen next.

03 / Pricing

Flat registration pricing. No annual contract required.

Project Setup

$750

Includes engagement setup, written sales tax footprint review, registration plan, document intake, and project coordination. Same setup fee whether the project includes 3 states or 13.

State Registration

$300/state

Includes application preparation, portal setup where applicable, registration submission, routine follow-up, permit tracking, and final account documentation for each state.

Optional Monitoring

$85/mo

Monthly review of sales-by-state against monitored thresholds, new-state alerts, and practical next-step recommendations. Added only if you want ongoing monitoring after the registration project.

Example project

Setup + 8 state registrations

Total professional fee

$3,150

State filing fees, registered agent fees, software subscriptions, tax payments, penalties, interest, voluntary disclosure work, and ongoing return filing are not included unless separately agreed in writing.

04 / Best fit

This is intentionally not for everyone.

Good fit

Ecommerce sellers with sales in multiple states
Shopify, Amazon, Walmart, Etsy, WooCommerce, or hybrid sellers
Businesses that need registration cleanup before growth, financing, or diligence
Owners who want a CPA-led project instead of a full compliance software rollout
Companies with clean sales-by-state data or platform reports available

Not the right fit

Businesses looking for full outsourced monthly sales tax return filing
Companies with large unresolved prior-period liabilities in many states
Businesses needing legal opinions, audit defense, or litigation support
Sellers without usable sales-by-state information
Companies that already need a full enterprise tax automation implementation

05 / Who you're working with

Run by an active CPA. Not a software company.

Brian Miller

CPA · MBA · MSF

Active CPA with 7+ years of accounting and finance experience
Corporate accounting and FP&A leadership background
Financial reporting, compliance, and controls experience
Revenue, account reconciliation, and operational reporting background
Master's in Finance and MBA

You are not buying a SaaS tool, a referral to an unknown third party, or a generic filing service. You work directly with a CPA who manages the registration project and communicates the status clearly.

That matters because registration data becomes part of your compliance record. Your legal name, entity type, ownership information, effective dates, sales channels, and filing frequency all need to be handled carefully.

This service is narrow by design. I am not trying to replace your income tax CPA, bookkeeper, attorney, or sales tax software. I help with the specific gap many ecommerce sellers run into: understanding where registration may be needed and getting those registrations completed cleanly.

06 / Common questions

Direct answers to common client questions.

What is nexus?

Nexus is a connection between your business and a state that can create tax obligations. Economic nexus is usually based on sales activity into a state. Physical nexus can arise from inventory, employees, property, trade shows, contractors, or other in-state activity.

Will you tell me exactly where I have to register?

I provide a practical nexus review and registration recommendation based on the facts and data you provide. If the facts suggest significant prior exposure, legal uncertainty, or a voluntary disclosure issue, I will flag that before moving forward with registration.

What about states where Amazon already collects sales tax?

Marketplace facilitator rules may reduce collection obligations on marketplace sales, but they do not automatically answer every registration question. Your own-site sales, FBA inventory, wholesale activity, exempt sales, and state-specific rules still need to be reviewed.

Do you file monthly or quarterly sales tax returns?

This page is for registration projects. Ongoing return filing is not included in the base service. If you need filing support, I can discuss whether it fits the scope or whether a filing platform or specialist provider would be better.

What if I may already owe back taxes?

Prior-period exposure is separate from forward registration. In some cases, registering without first addressing prior exposure may create problems. If that issue appears during the review, I will pause and discuss options, which may include a voluntary disclosure process or referral to a specialist.

Can I just use Avalara, TaxJar, or another software platform?

Yes. For some businesses, that is the right answer. This service is a better fit if you want a focused registration project, CPA-led review, transparent pricing, and a clean handoff before deciding whether you need ongoing software.

What states do you cover?

The service covers all 45 U.S. states with statewide sales tax, plus Washington, D.C. The five states without statewide sales tax (Alaska, Delaware, Montana, New Hampshire, Oregon) generally do not require registration, though Alaska in particular has local jurisdictions that may apply in certain cases.

How long does the process take?

Most registration projects take 2–3 weeks after document collection. Some states issue accounts quickly. Others take longer or require follow-up. The timeline depends on the states involved and the completeness of the client information provided.