Made for one form. Built to do it right.

Why we exist

If you're a US person who received more than $100,000 from a foreign individual or estate, the IRS wants Form 3520. The penalty for missing it is up to 25% of the gift value. TurboTax doesn't support it. CPAs charge $1,000–$3,000 to fill out a four-page form they will see once. We built software so you can do it in about 20 minutes for $99 flat.

Who we are

3520file is built by the small team behind fbarfile.com — software for FinCEN Form 114 (FBAR). Same team, same focus on niche international tax forms that the big tax-prep platforms ignore. 3520file launched in May 2026.

We are not a CPA firm, not a law firm, and not an enrolled agent. We are software that generates a correctly-filled, IRS-formatted Form 3520 PDF from your facts. You sign in pen and mail it certified to the IRS Service Center in Ogden, Utah. The IRS does not e-file Form 3520 — it never has, and we don't pretend otherwise.

What we believe

• One form, done right. Generalist tax software treats Form 3520 as an edge case. We built the entire product around it.
• Flat price, no upsell. $99 Standard. $149 Concierge if you want us to ship a pre-stamped certified-mail envelope to you. No subscriptions, no add-ons, no surprises.
• Honest about scope. We prepare the form. We don't represent you before the IRS or give tax advice. If your situation involves a foreign trust, an active audit, or contested inheritance, see a tax attorney or CPA.
• Compliance-first data handling. Paid tax preparers in the US are legally required to follow IRS Publication 4557 and the FTC Safeguards Rule. We do. Details on our Data Security page.

Talk to us

Question about your filing, a feature request, or a press inquiry — contact us. We read every email.