Onell.
Library · 20 free PDF guides

Everything you need to know to build in the US — in guides you can read in 10 minutes.

Written by a CPA who is also an IRS Tax Preparer and a Florida Notary — not by a marketing blog. Pick yours, leave your email, get it instantly.

📖 Heads up: these guides are currently written in Spanish — they serve our Latin American clients building in the US. English versions are on the way. If you need help in English right now, book a 15-minute consultation (USD 29, credited toward any service).
Most requested

The essentials

The guides our clients ask for most — LLC setup, compliance and banking.

Checklist: opening a US LLC as a non-resident

The full formation path, step by verifiable step: state, registered agent, articles, EIN — and everything in between.

Your LLC's annual calendar

The exact dates that trigger penalties if you miss them — Form 5472, annual reports, registered agent — on one page.

Business banking without traveling: passing KYC

What Mercury, Wise and Relay actually check before approving you, and the consistency checklist that gets you through.

BOI 2026: who is exempt now

The interim rule flipped the obligation — find out which group you're in and who to stop paying.

ITIN, step by step

When you actually need one (and when you don't), the W-7 without the classic traps, and how to keep your passport.

The $99 LLC rescue guide

Bought a bargain LLC? The 9-question diagnostic to find out what's missing and how to fix it — without paying twice.

Looking for the full library — apostilles, royalties, Amazon & Stripe, succession planning and more? Browse all 20 guides on the Spanish page →

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