Your Tax Return
Is an Engineering
Problem. We Solve It.

Professional tax consulting and tax preparation — approached with the precision of systems engineering. We don't guess at deductions. We model them.

Schedule a Consultation Our Approach
Who we work with
✦
Engineers & Tech Workers
RSUs, stock options, W-2 with complex comp structures
✦
Small Business Owners
LLCs, S-Corps, self-employed — complex returns done right
✦
R&D Tax Credit Clients
Identifying and documenting qualifying research activities
✦
Foreign Owners of US Entities
FDAP, ECI, treaty positions, Form 5472 & beyond
✦
High-Income Individuals
Complex returns, planning, and deduction optimization
Our approach

We Don't Fill Out Forms.
We Engineer Your Return.

Most tax preparers work linearly — they take your documents and enter numbers. We work like engineers: we map your full financial system, identify every interaction between income, deductions, and credits, and optimize the outcome before a single form is filed. Drawing on Model-Based Systems Engineering (MBSE) principles, we treat your tax return as a system to be designed — not a form to be completed.

Our approach · Part I

The System

Precise, compliant, and engineered for accuracy. These are the core filing services — executed with the rigor of a systems engineer, not a seasonal preparer.

MBSE-Driven Execution
📋

Individual & High-Income Returns

"Your brokerage sent a 1099.
That doesn't mean the basis is right."

High-income returns aren't complex because of the income — they're complex because of what the IRS wasn't told. Long and short-term basis goes unreported. Taxable amounts go undetermined. NUA gets missed entirely. We find it all.

Unreported Basis Net Unrealized Appreciation Multiple W-2s Taxable Amount Not Determined
🏢

Small Business & Entity Returns

"Your entity structure is either your biggest tax advantage or your biggest liability."

Most small business returns are filed — not engineered. S-Corp owners underpay or overpay salary. LLCs bleed self-employment tax they never had to pay. Personal and business expenses are commingled and deductions are missed. Workers get mislabeled. We don't just prepare the return — we pressure-test the structure behind it.

Reasonable Compensation S-Corp Election Timing 1099 vs W-2 Classification Payroll Tax (941 / FUTA / SUTA) Sales Tax Nexus Commingled Expenses
⛓️

DeFi & Crypto Tax

"DeFi doesn't have a 1099.
That doesn't mean it's not taxable."

Most CPAs won't touch DeFi. We built our methodology around it. Whether your assets live in a cold wallet or a hot wallet, across liquidity pools, staking protocols, or yield farming positions — we track every taxable event your exchange didn't report.

Liquidity Pools Staking Income Yield Farming Cold & Hot Wallets Unreported Basis
Our approach · Part II

The Strategy

Where the real optimization happens. These engagements go beyond filing — we model outcomes, identify structural opportunities, and build a forward-looking tax position that most preparers never think to offer.

Quantitative Analysis
💼

Tax Strategy & Planning

"The best tax move is the one made before December 31st. Most people find out about it in April."

Forward-looking scenario analysis — S-Corp elections, entity restructuring, deduction timing, and bracket management — modeled before year-end, not after the damage is done.

🔬

R&D Tax Credit Studies

"Most companies qualify. Almost none document it correctly."

We identify and substantiate qualifying research activities under IRC §41 using a systematic, engineering-grade methodology. If your business innovates, experiments, or solves technical problems — there's likely a credit waiting to be claimed.

🌐

Foreign Owners of US Entities

"You didn't know you had to file. The IRS doesn't care."

Foreign owners of US entities face some of the most punishing compliance requirements in the tax code — and most don't know it until it's too late. A missed or late Form 5472 carries a $25,000 penalty per violation, per year — even if your LLC earned zero dollars. No warning. No grace period. We identify your filing obligations before the IRS does — covering FDAP income, ECI analysis, treaty positions, FIRPTA, and full Form 5472 compliance.

📈

Retirement Strategy

"Your retirement accounts have a tax bill attached. We model it before you pay it."

Most people spend decades building retirement wealth — and then hand a significant portion to the IRS because no one modeled the tax impact in advance. We do. From Roth conversion and distribution analysis to Social Security income optimization, Required Minimum Distribution (RMD) planning, SEPP / IRC §72(t) scheduling, and multi-account sequencing across tax brackets — we build a withdrawal strategy that treats your retirement as the tax planning opportunity it is, not an afterthought.

📒

Bookkeeping & Records Strategy

"The IRS isn't your enemy — but they speak one language: documentation. We make sure yours is fluent."

Bookkeeping isn't a back-office chore — it's a strategic asset. Clean, well-substantiated records don't just satisfy your accountant. They tell the story the IRS needs to hear. We structure your recordkeeping so that if you're ever examined, the answer to every question is already on file.

Additional services

Other Services

Supporting services that complete the engagement — from correcting prior-year filings to representing you directly before the IRS.

📁

IRS Representation

IRS notices, audit inquiries, and correspondence handled with the same analytical rigor as our original filings — via Form 2848 Power of Attorney. We don't hand you a letter and wish you luck.

🔒

Amended Returns

Prior-year errors identified, documented, and corrected. We run the numbers before we file — so you know exactly what changed and why, and what it means for prior and future years.

📅

Extension Filing

Need more time? We file Form 4868 to extend your deadline and keep you compliant — while we complete your return properly, without shortcuts.

💳

Payroll Services

Payroll processing, payroll tax deposits, and compliance filings — Forms 941, 940, W-2s, and year-end reconciliation handled accurately and on schedule.

100%
Virtual — serving clients across the United States and globally
IRS
Authorized Electronic Return Originator (ERO)
EA
Enrolled Agent — Admitted to Practice Before the IRS
Year
Round tax consulting — not just during tax season
About the practice

Experience You Can
Count On

Nguyen Quantitative Tax is a virtual tax preparation and tax consulting practice based in the Greater Seattle Area, Washington. Every practitioner on our team holds an engineering background — we approach the tax code the way engineers approach a complex system: with structure, rigor, and a relentless search for optimization.

Every return is personally prepared and reviewed — not handed off to a junior employee. You get direct access to practitioners who understand your situation and have the analytical depth to find what others miss.

  • Enrolled Agent — Admitted to Practice Before the IRS
  • IRS Authorized Electronic Return Originator (ERO)
  • Secure document upload & IRS-compliant e-signature
  • Languages: English · Tiếng Việt · Deutsch
Get in touch

Let's Talk
About Your Taxes

Fill out the form and we'll be in touch within one business day to schedule a free 15-minute intro call.

Location

Greater Seattle Area, WA — virtual & in-person
Serving all 50 US States & global clients — virtually

Languages

English  ·  Tiếng Việt (Vietnamese)  ·  Deutsch (German)

Email

info@nguyenquantitative.com