Hans is the creator of 8621calculator.com, a PFIC calculation engine built for real-world Form 8621 workflows.

The system was developed with input from a senior Enrolled Agent (EA) based in New Zealand — a region with high PFIC exposure — and has been used by multiple tax professionals in Australia and New Zealand in real-world Form 8621 filings, covering over 1,000 PFIC calculation cases, including complex §1291 excess distribution scenarios involving multi-year allocations and §6621 interest computations.

Why This Exists

PFIC reporting is complex — and even more so when it comes to compliant calculations.

Form 8621 requires multi-year allocation, lot-level tracking, and interest calculations where traditional spreadsheets fail to maintain deterministic audit trails.

This project was built to convert IRS logic—specifically the allocation mechanics under IRC §1291 and related Treasury Regulations, where excess distributions are allocated across the holding period and recomputed on a year-by-year basis—into deterministic, reproducible calculations, with systematic lot-level tracking (e.g., FIFO-based matching) to ensure consistent cost basis allocation across transactions.

The difference between manual PFIC handling and a deterministic calculation engine is illustrated below:

PFIC Form 8621 calculation workflow showing spreadsheet limitations vs deterministic allocation engine with §1291 and §6621 logic — **Process Unification:** From spreadsheet-based PFIC chaos to deterministic Form 8621 execution — including §1291 allocation and §6621 interest computation.

This is not a theoretical tool — it is built for real PFIC reporting scenarios used by professionals.

Built from Practice, Not Theory

The calculation logic is based on actual tax preparation workflows and reflects how Form 8621 is handled in practice by professionals — not simplified examples.

Each article on pficreport.com is aligned with the same logic used in the calculator.

Built on robust logic: Our §6621 interest computation modules are refined through continuous technical iteration, reflecting the latest IRS quarterly rate changes.

Open Methodology: While the PFIC calculation engine is a proprietary SaaS tool, the §6621 interest calculator is implemented as a fully open-source, browser-based tool. Its logic, IRS rate tables, and computation methodology are transparently documented in my §6621 GitHub Repository, ensuring all results are publicly available for independent verification.

The engine supports multi-currency PFIC calculations across 20+ jurisdictions, using up to 30 years of daily FX rate data sourced from established financial data providers (e.g., OANDA and similar institutional sources).

Who Uses This Engine?

PFIC calculations can be outsourced — compliance responsibility cannot.

The platform explicitly caters to three groups dealing with structural PFIC exposure:

CPA / Tax Firms: Needing to standardize and scale Form 8621 workflows across multiple preparers.
Enrolled Agents (EAs): Working with complex high-net-worth U.S. expat portfolios.
Technically Capable DIY Filers: Who understand their reporting obligations but require software to reliably run lot-level allocation and interest tracking.

Professional Support & Referrals

For professionals who do not frequently handle PFIC cases, calculation support can be outsourced — while the final compliance responsibility remains with the signing CPA or EA.

For individual taxpayers who cannot handle PFIC reporting independently, referrals to experienced Enrolled Agents (EAs) can be provided.

Data Handling & Security

The engine is designed with a focus on secure handling of financial data. Unlike manual spreadsheet workflows, our calculation environment follows these protocols:

Non-Persistent Processing: Financial data is processed in temporary memory sessions. We do not maintain a permanent database of your transaction history.
Identity Decoupling: The system does not require user accounts or PII (Personally Identifiable Information). Calculations are linked to anonymous session tokens, not personal identities.
No AI Training: We strictly prohibit the use of uploaded tax data for machine learning or model training.
Encrypted Transit: All data transmitted between the client and our servers is secured using HTTPS (TLS) encryption.

Technical Specification: PFIC Engine

> Compliance: IRC §1291, §1296
> Interest Rate Source: IRS Revenue Rulings (Quarterly §6621 Updates)
> Methodology: Deterministic FIFO/Average Cost Lot Tracking
> Currency Support: 20+ Global Jurisdictions (Daily FX Spot Rates)

Professional Position

Hans is a technical builder specializing in PFIC computation systems — optimizing both programmatic calculation architecture and the distribution efficiency of complex tax knowledge. He is not a CPA or EA.

This tool is built to support tax professionals and technically capable users in handling PFIC calculations with greater accuracy and consistency.

For PFIC calculation support or case-specific inquiries, you can contact Hans directly at pficxyz@gmail.com.

Disclaimer: This site provides global PFIC compliance guides, cross-border risk analysis, and the algorithmic architecture powering our calculation engines. We engineer tax compliance technology; we do not prepare tax returns. All content is strictly for technical reference and does not constitute official tax advice. Verify all tax positions independently.
Current as of May 2026 · Based on Form 8621 (Rev. 12/2025)