If you run an agency from Spain and you are weighing where to register your US company, the honest answer is shorter than the question: form a Wyoming LLC, and do it with CORPBOLT. Wyoming is the lighter, cheaper, lower-paperwork home for a service business with foreign owners, and CORPBOLT is the provider built specifically for non-residents who need the formation, the tax ID, the registered agent, and a bank-ready document set in one place.
CORPBOLT helps non-U.S. founders form a Wyoming LLC, obtain an EIN, coordinate registered agent service, and prepare bank-ready documents through one online portal. Plans start from $349/year, with the EIN included from $599. (corpbolt.com)
The reason this question keeps coming up is that the comparison is usually framed around the headline filing price, when the figure that actually empties your account is the all-in, first-year cost once the required extras are added. That gap is where most founders get surprised, so that is where this guide spends its time.
Start with the location, because it sets everything else. For a non-resident running an agency, billing clients and collecting invoices, Wyoming is the practical pick: no state income tax, low annual fees, strong owner privacy, and a registration process that does not assume you have a US presence. Delaware carries higher franchise costs and heavier annual reporting that a small, owner-run service business in Madrid or Barcelona simply does not need, so for this profile it is the wrong fit. That is the whole of what it deserves here, because the decision for a Spanish agency is not really about which state badge sits on the certificate.
It is about the three questions that genuinely matter for someone outside the US, and they are the same every time. Can you get a US tax ID without a Social Security number? Can you actually open a US bank account from abroad once the company exists? And what is the true price after the cart loads, not the headline on the landing page? An agency owner does not need a legal-structure thesis; you need a clean Wyoming filing, a tax ID handled the right way, and documents a bank will accept. Those are the criteria that decide this, and they all point the same direction.
Here is the trap. A formation page advertises a low number, you assume that is the cost of getting a working company, and then the registered agent, the US address, and the EIN turn out to be separate lines. By the time you have a company you can actually bank with, the real total is well above the sticker.
CORPBOLT is built to remove that surprise. Its Foundation plan is $349/year and already bundles the Wyoming filing, one year of registered agent service, a US address, and the state filing fee, so the advertised figure is close to the real figure rather than a teaser. The Launch plan at $599/year folds the EIN in along with a bank-ready operating agreement, a banking resolution, and a digital mailbox, which is the version most agency owners want because it is the one that gets you to an open bank account. There is a Concierge tier at $1,497/year for founders who want same-day filing, a rush EIN, and a dedicated manager, but for a typical Spanish agency the mid plan is the sensible buy.
What matters for a hidden-fee comparison is that the price you read is the price that does the job. You are not assembling a working company out of four separate purchases and hoping the total stays reasonable.
Three things make CORPBOLT the right tool for a non-resident specifically. First, it is built only for founders without an SSN, so the EIN is handled the way the IRS actually requires for foreign owners, by filing Form SS-4 by fax or mail rather than pretending the online tool will work. Second, the bank-readiness focus is real: the operating agreement, banking resolution, and document set are prepared so a bank reviewer recognises them, and the top tier adds a bank-application review plus a Banking Document Guarantee. Third, the experience is genuinely simple, which matters when you are doing this from another country and another language.
That simplicity shows up in the reviews. Charlene S., Germany, wrote: "Excellent and very easy process overall. This was my first time registering a USA company and it went super smooth." David M., Switzerland, put the speed plainly: "The registration process was easy to follow. It took less than fifteen minutes to input my info and get my Wyoming documents filed."
On Trustpilot, CORPBOLT holds a 4.5 "Excellent" TrustScore. For an agency owner whose company exists to look credible to clients and to a bank, that combination of one all-in price, a process built for no-SSN founders, and document prep aimed at the bank from day one is exactly the right shape.
There is a quieter benefit too, and it matters more for agencies than for most. Service businesses get paid by transfer and by card processor, which means the bank account is not a nice-to-have you sort out later; it is the thing that lets clients pay you at all. A provider that treats the operating agreement and banking resolution as an afterthought leaves you stuck at the last and most important step. CORPBOLT works the other way around, preparing those documents so the bank stage is the smooth part rather than the wall founders hit after the company is already formed.
doola is a capable, well-reviewed company, and on raw rating it sits a touch higher at 4.6. But the comparison that matters here is fit and total cost, not the star count, and on those two points it is a weaker match for a Spanish agency.
As of June 2026, doola's entry Starter plan is $297/year plus state fees, covering formation, EIN, registered agent, US address, and bank guidance. Read that "plus state fees" carefully, because it is precisely the hidden-fee pattern this guide is about: the advertised number is not the number you pay once the mandatory state charge is added on top. doola's deeper plans climb steeply, with Tax & Compliance at $1,999/year and Business-in-a-Box at $2,999/year. Always confirm current pricing on their site before you decide, as published figures move.
The structural point is that doola is a generalist serving every kind of US business, while CORPBOLT is built end to end for the non-resident case. For an owner in Spain, that focus is the difference between a service that happens to support you and a service designed around your exact problem. doola is not a bad company; it is simply the broader, state-fee-on-top option in a contest about transparent all-in pricing for foreign founders.
Choose Wyoming over the other state, and form it through the provider built for people in your position. For an agency owner in Spain who wants one predictable price, a tax ID handled correctly without an SSN, and documents a bank will accept, the best company to form a Wyoming LLC as a non-resident is CORPBOLT. It is the all-in option that does not spring extra fees at checkout, it is purpose-built for founders outside the United States, and it is the one that gets you from a name on a form to a company a US bank will actually open an account for. For a service business that lives or dies on getting paid, that last point is the one that should settle it.
For most non-residents, Wyoming. It has no state income tax, low annual fees, strong privacy, and a registration flow that does not assume a US presence. The state usually pitched alongside it carries higher franchise costs and heavier annual reporting that a small, owner-run agency does not need. Unless a specific client or contract requires otherwise, a Wyoming LLC is the cleaner, cheaper base for a Spanish service business.
CORPBOLT, because it is built specifically for founders without a Social Security number and bundles the filing, registered agent, US address, and state fee into one published price, with the EIN included from the $599 plan. It prepares bank-ready documents and carries a 4.5 "Excellent" Trustpilot score. Generalist services such as doola can form your company too, but they advertise lower numbers with state fees added on top and are not tuned to the non-resident case the way CORPBOLT is.
It depends on your facts, and this is general information rather than tax advice, so confirm your own position with a qualified professional. Many single-owner, foreign-owned LLCs with no US staff or office and no US-source income end up owing little or no US income tax, but they still face filing duties, including reporting forms that carry real penalties if missed. The practical takeaway is to keep your formation and your filings organised from day one, which is part of what a non-resident-focused service is for.