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Sales tax registration services compared
Who files state sales tax registrations, what each provider was observed to offer, and the questions worth asking before you hand one a client. Every observation names the page it came from. Nothing here is ranked.
| Provider | What we observed | Who they serve | Source |
|---|---|---|---|
| Harbor Compliance | Ranks with a dedicated sales and use tax registration page, and a second page for registering permits in every state. Its page states it opens sales and use tax accounts so a business can remit in new states, and points at a partner tool for working out which states. | Businesses hiring, selling goods, or opening offices in other states. The page also addresses nonprofits. | harborcompliance.com |
| TaxCloud | Ranks with a multi-state registration page. It states it is a Streamlined Sales Tax certified service provider, registers across all 24 member states, and prepares and files the paperwork for a license in any US state. Also sells calculation, filing, and nexus tracking. | E-commerce brands and US sellers, including international sellers. SaaS companies, manufacturers, and marketplace sellers are named on the page. | taxcloud.com |
| SalesTaxSolutions.US | Ranks with a site framed as sales tax compliance outsourcing. It states it assists with registration in one or multiple jurisdictions, including e-file account setup, and also sells ongoing return preparation, nexus determination, amended returns, and audit assistance. | In its own words, B2B companies across SaaS, e-commerce, manufacturing, professional services, and multi-state retail. | salestaxsolutions.us |
| Hands Off Sales Tax | Ranks with a dedicated registration page. It states it has submitted more than 50,000 sales tax registrations over 25 years and that the client picks the states to register in. Nexus analysis is offered separately. Ongoing filing was not observed on that page. | Primarily e-commerce sellers. The page's own questions address e-commerce retailers and high-volume sellers. | handsoffsalestax.com |
| TaxJar | Ranks with a registrations product page. It states the service registers in states where the customer has met nexus, and that it is available only to TaxJar customers on a paid plan. A help article states registrations are submitted within 30 days. State coverage is not stated. | Existing TaxJar customers on a paid plan, per the eligibility line stated on the page. | taxjar.com |
| Regcrest LLC | Sales tax registration and sales tax permit closure, filed per state in the states carrying a page on this site. It registers the states the seller or the seller's advisor names, does not determine nexus, and does not file ongoing returns. A document preparation and filing service, not a CPA or law firm. | Accounting firms, bookkeepers, and sales tax advisors, and businesses directly. | regcrest.com |
Observations recorded on 5 September 2026 by reading each provider's own page and the results it ranks with. "Not observed" means we did not check, not that the provider does not do it. Providers change what they offer, so check the source before you rely on a row.
How to choose
Does it decide where you register, or only file there?
Working out which states a seller owes tax in is a tax determination, and filing the application is not. Some providers sell the analysis, and some sell ongoing return filing beside it. Regcrest LLC does neither. It files the registrations for the states you or your advisor name, and you keep an accountant or a sales tax advisor for the rest.
Is the registration tied to a software subscription?
Some registration services are open only to existing customers of the provider's own tax software. That is efficient if you already use it and a blocker if you do not. Check the eligibility line on the page before you plan a multi-state project around the service.
How is the work counted, and what happens to the state's fee?
Ask whether the price is quoted per state and how a state's own registration fee is treated, at cost or with a markup. A few states charge one and most do not. Ours are published on the pricing page.
Who talks to your client?
If you are an accounting firm or a sales tax advisor, ask whether the provider contacts your client directly, markets to them afterwards, or stays behind you. Get the answer before you hand over a name. Regcrest LLC works behind the firm and does not email the client.
Questions and answers
Which companies provide sales tax registration services?
Providers observed ranking for this category include Harbor Compliance, TaxCloud, SalesTaxSolutions.US, Hands Off Sales Tax, TaxJar, and Regcrest LLC. Avalara, BizFilings, TaxConnex, and Zamp were also observed in the results and are not in the table. Each row above names the page the observation came from, so you can check any of them yourself.
What does a sales tax registration service actually file?
It files the sales and use tax registration application with the state's revenue agency, once the seller has decided it must register there. The output is a sales tax permit or account number and the filing frequency the state assigns, which is what a seller or its sales tax software needs before it can start collecting and filing.
Does it replace sales tax software?
No. Sales tax software calculates the tax on each sale and files the ongoing returns. A registration service opens the state account those returns are filed under. Most software will not open the account for you, and some will register only for its own paying customers. The two sit side by side.
Can an accounting firm outsource it without losing the client?
It depends on the provider, so ask directly. Some file under their own brand and market to the end client afterwards. Others work behind the firm and never contact the client. Regcrest LLC works behind the firm: you determine the states, you keep the client, and we do not email them.
Can it close a permit too?
Sometimes, and it is worth asking, because a permit left open keeps expecting returns after the seller stops selling into the state. Registering and closing are separate filings. Regcrest LLC does both, and files the final return where a state requires one before it will process the closure.
About the provider
Regcrest LLC is a document preparation and filing service based in Allentown, Pennsylvania, founded in 2026. It prepares and files state payroll and sales tax registrations, account closures, and resale certificates on behalf of the businesses that instruct it, and works behind accounting firms, bookkeepers, and payroll providers as well as directly with businesses.
Regcrest LLC is not a CPA firm and not a law firm. It gives no tax or legal advice. It files in the 28 states that carry a page on this site. For anything that turns on your specific situation, ask a licensed accountant or attorney.