What's different about California applications
California applicants consistently run into friction points that generic guides miss. In my client files, four factors come up repeatedly:
- Multi-department approvals at tech companies. A startup founder signs your letter the same afternoon. At a mid-size or large tech company, the request moves through Global Mobility, Tax, Payroll, and Legal before anyone signs.
- Equity-heavy compensation. Silicon Valley pay packages mix base salary, RSUs, ESPPs, and bonuses. Base salary clears the income bar easily in most cases — but when equity needs to be counted, the documentation requirements are different from a payslip.
- The state vs. federal apostille split. California has its own Secretary of State apostille process in Sacramento and Los Angeles. The FBI background check is a federal document and requires the U.S. Department of State in Washington, D.C. Mixing these up is the most common avoidable delay I see from California clients.
- California's long tax reach. The Franchise Tax Board does not release you automatically when you move abroad. Managing that transition correctly matters — and it interacts with your Spanish tax position.
Consulate route vs. in-country UGE route
California applicants have three options: the San Francisco consulate (Northern California), the Los Angeles consulate (Southern California), or entering Spain legally as a tourist and having me file with the UGE from inside Spain. The third option is usually the right one — it produces a 3-year permit instead of a 1-year visa and resolves in about 20 business days. The full comparison is in the route guide.
| Consulate (SF or LA) | In-country UGE | |
|---|---|---|
| Jurisdiction | SF (Northern CA) or LA (Southern CA) | Online, while legally present in Spain |
| Permit issued | 1-year visa | 3-year residence permit |
| Appointment | In-person consular slot required | Digital submission through legal representative |
| Document review | Consular officer; regional formatting standards | Centralized UGE in Madrid |
The state vs. federal apostille trap
This is where California applications fail more often than anywhere else. The rule is simple but easy to get wrong: federal documents go to federal apostille authority; state documents go to the California Secretary of State.
| Document | Correct apostille authority |
|---|---|
| FBI background check | U.S. Dept of State, Washington D.C. — federal apostille |
| SSA Certificate of Coverage | U.S. Dept of State, Washington D.C. — federal apostille |
| California birth and marriage certificates | California Secretary of State (Sacramento or LA) — state apostille |
| University degree | CA notary public + California Secretary of State — state apostille |
| Employer letter, service contracts | No notarization or apostille required |
A California Secretary of State apostille on an FBI background report will not be accepted by Spanish immigration authorities. Only one document in the whole file requires notarization: the university degree — as an apostilled notarized true copy of the original diploma. Everything else is either a state apostille, a federal apostille, or nothing. Full detail in the FBI background check and federal apostille guide.
Tech companies and internal approvals
At a California startup, getting the employer letter signed is a one-day task. At a mid-size or large tech company, it is a multi-week process. The request typically passes through:
- Global Mobility: reviews whether remote work abroad is permitted under corporate policy and for how long.
- Corporate Tax and Legal: assesses whether a Spanish-based employee creates a permanent establishment risk under the U.S.–Spain tax treaty.
- Payroll: determines how withholding and Social Security will be handled while the employee is outside the U.S.
The permanent establishment concern is the one that stalls most California tech approvals. In nearly every case I've worked, a remote employee working from a personal residence in Spain without contract-signing authority on behalf of the company does not create a taxable corporate presence. But corporate tax counsel needs to reach that conclusion themselves — and a narrowly drafted authorization letter that addresses the concern directly moves the process faster than a generic request. I draft these letters for my clients; the employer adapts them and signs.
For W-2 employees, showing HR that the SSA Certificate of Coverage exempts the company from Spanish Social Security registration typically resolves the payroll objection. Start that certificate first — it takes about 3 months and nothing else can substitute for it.
Equity compensation: RSUs, bonuses, and what Spain accepts
Base salary is the cleanest way to meet the €2,849 gross per month income threshold. Most senior California tech employees clear it on salary alone. But when equity or bonus income needs to be counted, the file has to show it is recurring and predictable — not a one-time event.
What the UGE typically expects for equity income:
- Vesting schedules and grant agreements from platforms like Carta, Shareworks, or E*TRADE showing the ongoing vesting pattern.
- Brokerage statements showing distributions over prior months.
- W-2 entries or payslips confirming the equity income appears as recurring compensation.
A one-year lump-sum RSU vesting event does not count as monthly income for UGE purposes. Regular quarterly vesting that appears consistently in payslips is a different story. The file has to connect the grants, the vesting schedule, and the deposits into one consistent narrative — exactly like the general income file, but with more moving parts.
W-2 employees and 1099 contractors from California
W-2 employees (including PEO payroll)
If your W-2 comes from a California employer — or from a PEO like Rippling, Justworks, Gusto, or TriNet — your file is built around the SSA Certificate of Coverage. This certificate proves you remain in the U.S. Social Security system under the U.S.–Spain Totalization Agreement and exempts your employer from Spanish Social Security registration.
Start the certificate request on day one. It takes about 3 months and the rest of the file waits for it. If your payroll runs through a PEO, the request has extra steps — the SSA needs to see the correct legal employer named consistently with your W-2. My guides on Justworks, Rippling, and Gusto cover the PEO-specific process.
1099 contractors
1099 contractors skip the Certificate of Coverage entirely. Instead, you register directly as an autónomo (self-employed) in the Spanish Social Security system after approval. Up to 20% of your total professional activity may come from Spanish companies, provided at least 80% stays with clients outside Spain. The file is built around commercial contracts, invoices, and bank deposits rather than an employer letter. Full detail in the 1099 contractor guide.
California taxes after you move
This is the part most immigration guides skip. Moving to Spain does not automatically end California state tax obligations. The Franchise Tax Board applies its own residency test — domicile and permanent presence — and if the FTB concludes your move is temporary, or that you retain California domicile ties (real estate, bank accounts, vehicle registrations, family), it may continue asserting worldwide income taxation.
The practical checklist for severing California tax residency involves more than buying a plane ticket. It means systematically removing the California-specific ties the FTB looks at — before you leave, not after. This analysis runs parallel to, and interacts with, your Spanish tax setup: many California clients also explore the Beckham Law, subject to meeting the applicable tax requirements, which changes the Spanish side of the picture significantly. Both analyses belong in the planning phase, not after arrival.
The realistic California timeline
- Month 1: Assessment and employer conversation — confirm eligibility, start the SSA Certificate of Coverage request, order the FBI background check via the fast-track channel, line up health insurance.
- Month 2: Gather income evidence (payslips, vesting statements, bank records), draft employer letter, obtain California state apostilles on vital records, submit university degree for notarization and state apostille.
- Month 3: Federal apostilles arrive on FBI check; sworn Spanish translations completed; file assembled and reviewed.
- Month 3–4: SSA Certificate arrives. You fly to Spain. I file with the UGE. Resolution in about 20 business days — three-year permit.
The certificate is the timeline. Everything else can be parallelized around it, but nothing substitutes for it in a W-2 case. California clients who start the certificate on day one and fly with the file ready move through this process on the faster end of that range.
If you're preparing from California and want a clear picture of where your file stands — particularly around equity income, employer approval, or the FTB question — the free assessment maps your specific situation and tells you what your file needs before you start spending on documents.
Sources: Ley 28/2022 (BOE) · Ministerio de Inclusión — UGE. This guide is general information, not legal advice. Last updated: July 2026.