30% withholding on FDAP
All U.S.-source fixed or determinable annual or periodical income paid to a foreign person is subject to 30% withholding unless a treaty or Code exception applies.
The most rigorous §1441–1461 compliance pack a U.S. payer can send.
Sourceline assembles a documentation-complete nonresident withholding and filing pack — every W-8 validated, every treaty rate determined, every Form 1042-S prepared, and the annual Form 1042 reconciled — checked against the letter of the Internal Revenue Code before a credentialed preparer releases it.
Every subsection of IRC §§1441–1461Five statutory notice elements, gate-checkedW-8 · treaty · income code · exemption code · withholding rateCredentialed preparer release on every pack5-business-day SLA
Why packs fail
A single missing element can trigger personal liability for 30% withholding.
A U.S. payer's nonresident withholding obligation is only as strong as the documentation behind it. Miss a valid W-8, apply the wrong treaty rate, misclassify the income code, or fail to file a single Form 1042-S — and the payer becomes personally liable for the 30% tax under IRC §1461, plus interest and penalties.
Most payers run this by hand, from memory, once a year. The regulations have not been read end-to-end since the last time it mattered. That is exactly where completeness gaps hide.
Sourceline exists to close that gap with a single, exhaustive standard applied identically to every file.
30%
default withholding rate when documentation is missing or invalid
The benchmark
Measured against the letter of the Code — subsection by subsection.
We do not summarize the law and hope. Every pack is scored against a versioned rule pack tied to the exact text of IRC §§1441–1461 and the associated regulations. These are the provisions each pack is held to.
Personal liability
The withholding agent is personally liable for the tax required to be withheld. Every pack verifies that the correct amount was withheld and deposited.
Beneficial owner documentation
A valid Form W-8BEN, W-8BEN-E, W-8IMY, or 8233 must be collected and validated for each payee before a reduced rate may be claimed.
Treaty-based reduced rates
Treaty eligibility is verified against the current treaty table, including termination and suspension events (e.g., U.S.–Hungary, U.S.–Russia).
Form 1042-S filing
Every payee must receive a Form 1042-S by March 15, and the IRS must receive an electronic copy. The pack includes both filing and recipient copy furnishing.
Penalty tiers
Late or incorrect 1042-S forms incur penalties of $60–$340 per form (up to $680+ for intentional disregard), applied twice (IRS copy + payee copy).
How a pack is built
Intake to credentialed release, with deterministic gates the AI cannot overrule.
AI extracts and drafts. Deterministic rules — running as code, outside the model — decide what is complete. A credentialed preparer (CPA/EA) validates judgment calls and signs every release. That order is never reversed.
01
Delinquency Gap Scan
Upload the payee list and payment ledger. We return a free completeness read: which W-8s are missing or expired, which treaty rates are stale, and which income codes are unassigned.
02
W-8 collection & validation
As your authorized clerical agent, we collect and validate each Form W-8BEN/W-8BEN-E/W-8IMY/8233, cross-check TINs, and flag expired or incomplete documentation.
03
Treaty & rate determination
The correct treaty article, income code, exemption code, and withholding rate are determined from the validated W-8 and the current treaty table — no legal opinions, no invented facts.
04
Deterministic completeness gates
Withholding amounts reconcile to the ledger to the penny; the March 15 deadline is verified; the W-8 checklist is resolved; SCRA is screened. Any failure blocks release.
05
Credentialed preparer release
A CPA or EA reviews the exception queue and signs the release. High-value or complex treaty claims route to attorney review first.
06
Delivery
You receive the pack: all Forms 1042-S (IRS copy and recipient copies), Form 1042, reconciliation memo, W-8 evidence log, and a multi-year audit file — ready for the payer to sign and file under its own name.
The bar we hold
Rigor you can measure.
100%
Credentialed-preparer released
No pack ships without a CPA/EA signature.
5 days
Standard SLA
From complete intake to released pack.
<1%
Critical-defect target
Tracked against a gold-standard pack library.
4
Validation sources
W-8 · treaty table · income code matrix · IRS e-file system, every applicable file.
Why Sourceline
Built to be the most thorough option a payer has.
Documentation-complete, by design
The deliverable is completeness itself — every W-8 validated, every treaty rate determined, every form filed — accounted for or explicitly exception-coded. Nothing is left implicit.
Deterministic, not vibes
The gates that decide completeness are code, not a model's opinion. A drafting error cannot slip past a statutory requirement.
In its lane, on purpose
We prepare documentation and run searches as your clerical agent. We never contact the payee, give legal advice, or act as the withholding agent.
Engagement
Flat fee, per released pack. No contingency, ever.
Simple, predictable, and aligned with a documentation standard — not a cut of any recovery.
- A free Delinquency Gap Scan before you commit — see exactly what is missing.
- One flat fee per released Compliance Pack; disclosed pass-through search fees.
- Optional fixed-fee attorney review for high-value or complex treaty claims.
- Optional Sale Continuity Add-on for the advertisement and sale-day exhibits, pre-dated to your 60-day window.
FAQ
Questions, answered precisely.
Is Sourceline a law firm?
No. Sourceline, a service of Your Deputy, Obuke LLC, provides documentation-completeness services. It is not a law firm, does not provide legal advice, and does not represent you in any legal matter. Attorney review is available and recommended for high-value or complex treaty claims.
Do you contact the payee or collect the tax?
Never. Sourceline is not a debt collector and does not contact payees or debtors. The payer remains the withholding agent of record and the party responsible for sending all notices and filing returns.
What makes a pack 'complete'?
Completeness is defined by the Code: every W-8 validated, every treaty rate determined, every Form 1042-S prepared, and the annual Form 1042 reconciled. Deterministic gates enforce each one before release.
How fast is it?
The standard SLA is five business days from complete intake to a credentialed-preparer released pack. The free Gap Scan is returned much sooner and tells you exactly what is still needed.
How are you priced?
A flat fee per released pack, plus disclosed pass-through search costs. No contingency and no percentage of any recovered amount or sale proceeds.
See what's missing before it costs you a penalty.
Start with a free Delinquency Gap Scan. Send your payee list and payment ledger and we'll return a completeness read against every subsection of IRC §§1441–1461.
Documentation-completeness service · not legal advice · the payer files every return.