Your life crosses borders. Your taxes should keep up.
MKHS Tax Group is a boutique firm led by Enrolled Agent May Sung — international and cross-border tax for expats, nonresidents, and foreign owners, with preparation, planning, and bookkeeping for clients anywhere in the world.
- May Sung, EA — Owner & Founder; you work with her directly
- Over a decade in taxation, at multinational and regional firms
- Two master’s degrees — Accountancy (San Jose State) · Museum Studies (NYU)
- Borderless by design — online consultations, one secure client portal
Start with the door that fits your life
Tax Preparation
Returns prepared by an Enrolled Agent — at home, abroad, or years behind.
- Individuals · entities · nonprofits
- Expats · nonresidents · nomads
- Amended & delinquent filings
Tax Planning & Consulting
Decisions made before December beat deductions hunted in April.
- Quarterly estimates · year-end
- IRS & state notices
- Formations · payroll guidance
International Tax
The full cross-border index: expatriate returns, FBAR & FATCA, foreign entities, catch-up filings.
- Forms 114 · 8938 · 2555 · 1116
- Forms 3520 · 5471 · 5472 · 8854
- Streamlined compliance paths
Bookkeeping Services
Month-to-month books that stay organized and tax-ready all year.
- Monthly categorization
- Reconciliations · statements
- QuickBooks Online setup
Pick your crossing. Watch what attaches to it.
Every border crossing carries filing duties most people only discover from an IRS notice. Choose the one that sounds like your life — the board plots your route and stamps in the obligations from our international practice.
U.S. citizen moving abroad
One move can attach six U.S. filings. Most are about reporting your life abroad correctly — not paying tax twice.
Sample route · General education, not tax adviceBring your crossing — we will map the real one.
The full cross-border index
This is the work generalist firms refer out — and the work this firm was built around. Expatriate and inpatriate taxation, foreign accounts, treaties, and cross-border structuring, handled by the Enrolled Agent who founded the practice.
Living & working abroad
- U.S. Expatriate Tax Return PreparationForms 1040 · 1116 · 2555
- Foreign Earned Income ExclusionForm 2555
- Foreign Tax Credit OptimizationForm 1116
- Foreign Pension, Superannuation & Retirement Plan Reporting
Accounts, trusts & gifts
- Foreign Bank Account ReportingFBAR · FinCEN Form 114
- FATCA ComplianceForm 8938
- Reporting of Foreign Trusts & GiftsForms 3520 / 3520-A
- Passive Foreign Investment CompaniesPFIC · Form 8621
Companies & structures
- U.S. Reporting for Foreign Corporations & EntitiesForms 5471 · 5472 · 8865 · 8858
- Controlled Foreign Corporations (CFC) & Subpart F / GILTI Compliance
- Foreign Branch Profits & Loss Reporting
- Cross-Border Business Structuring & Tax Efficiency Planning
- Withholding Tax ComplianceForms 8804 / 8805 / 8813
- Inbound U.S. Investment Structuring for Foreign Owners
- Outbound U.S. Investment Structuring
Catch-up & exits
- Streamlined Filing Compliance ProceduresDelinquent expat filings
- Exit Tax Planning & ExpatriationForm 8854
Preparation & planning, with the same rigor
Cross-border depth, applied at home: careful preparation, planning that runs all year, and direct help when a notice arrives — responding to IRS and state notices, resolving outstanding issues, and getting you fully compliant.
Tax Preparation
- Individuals
- Partnerships
- Corporations
- S-Corporation
- Single Member LLCs
- Multi-state filing
- Expatriates / Nonresidents / Digital Nomads
- Nonprofit Organizations
- Gift tax returns (Domestic and Foreign)
- FinCEN 114 reporting
- Amended tax returns
- Delinquent / Compliance Catch-up Filings
Tax Planning & Consulting
Planning looks across years, not just deadlines: multi-year income planning, retirement strategies, business structuring, real estate, and estate considerations.
- IRS Tax Notice Assistance
- Tax Planning — Quarterly Estimates
- Tax Planning — Year End
- Tax Installment Agreements
- Business formations
- Streamlined Foreign Offshore Disclosures
- Streamlined Domestic Offshore Disclosures
- Payroll tax compliance review (federal, state, local)
- Employer/Employee Classification analysis (W2 vs 1099)
- Payroll System Setup & Process Review (QuickBooks, Gusto, ADP, etc.)
- Multi-State Payroll Tax Guidance (remote employees, nexus issues)
- FICA, FUTA, and SUTA Calculation & Planning
Your business decisions are only as strong as your books
Accurate, month-to-month bookkeeping that keeps your financials organized and tax-ready all year long — so tax season starts from clean numbers, not a shoebox.
- Monthly categorization of business transactions
- Reconciliation of bank, credit card, and merchant accounts
- Clear monthly financial statements — Profit & Loss and Balance Sheet
- Year-end tax preparation support and clean-up
- QuickBooks Online expertise and setup assistance
Reliable numbers, simplified reporting, and peace of mind — handled correctly, every month. Book an appointment →
No mystery steps. The process is in writing.
Book an appointment
Bring the situation — a move, a foreign account, a notice, a backlog. We start with your actual facts.
Your portal opens
TaxDome is your home base: Tax Organizer, secure document upload, messaging, invoices, and e-signatures.
Sign & retainer
A signed engagement letter and a 50% retainer place your return in the preparation queue. Unused retainer is refunded.
Preparation & review
Your return is prepared and reviewed, and you e-sign your e-file authorization right in the portal.
Balance, then e-file
Your final invoice arrives through TaxDome; once the balance is paid, your return is e-filed.
From gallery walls to Form 5471
May Sung did not take the usual road into tax. She began her career in the arts — with a Master of Arts in Museum Studies from New York University — before switching fields, earning a Master of Accountancy from San Jose State University, and spending over a decade in taxation at multinational and regional firms.
That path shows up in the work: a curator’s eye for what is actually in the frame, and an educator’s instinct for explaining the “why” behind your numbers — not just the numbers. She founded MKHS Tax Group to practice the specialty she knows deepest: international and cross-border taxation, for expatriates, nonresidents, and the foreign owners of U.S. businesses.
- IRS Enrolled Agent
- Master of Accountancy — San Jose State
- MA Museum Studies — NYU
- Over a decade in taxation
“Explain the ‘why’ behind the numbers.” — how May describes the point of every engagement.
The firm keeps a community page for Pasadena Humane, featuring adoptable Dogs of the Week — because a boutique firm should act like a neighbor, too.
One client. Her exact words.
May is incredibly detail oriented and accurate. Her expertise saved me money and time. She has become an essential part of my financial team
The depth behind the words
- An Enrolled Agent, personallyOver a decade in taxation — and the same person, start to finish.
- Two master’s degreesAccountancy from San Jose State; Museum Studies from NYU.
- Multinational & regional firm trainingBig-system rigor, applied at boutique scale.
- A specialty with real depthThe full cross-border index — from Form 2555 to Subpart F and GILTI.
- Teaching, every weekTax Tip Tuesday and Tax Talk Thursday, written by May herself.
Learn it before you need it
May writes and teaches constantly — the same plain-English explanations clients get in the portal, published for anyone whose life crosses a border.
Tax Tip Tuesday
Short, practical reads on the questions clients actually ask.
- S-corporation reasonable compensation
- Schedule E, explained
- Year-end income timing
Tax Talk Thursday
The deeper dives — where cross-border rules get untangled.
- Form 5471 for green-card holders
- FBAR & FATCA: streamlined vs. OVDP
- Tax treaty tie-breaker rules
Lunch & Learn Webinars
Live teaching on the topics of the season.
- Artists, influencers & entertainers
- The “Big Beautiful Bill,” decoded
- Entity basis tracking
Before you book
I live outside the United States. Can we still work together?
Yes — that is the heart of this practice. As a boutique firm, we offer flexible online consultations and seamless digital solutions, so you can work with us no matter where you are in the world. Your documents, Tax Organizer, invoices, and e-signatures all run through your secure TaxDome client portal.
What is an Enrolled Agent?
An Enrolled Agent is a tax professional authorized by the IRS to represent taxpayers. May Sung, the owner of MKHS Tax Group, is an Enrolled Agent with over a decade of experience in taxation — and she is the person who handles your work personally.
I am behind on foreign filings. Is there a way back?
Usually, yes. The Streamlined Filing Compliance Procedures — including the Foreign and Domestic Offshore paths — exist for taxpayers whose expat or foreign-account filings fell behind. Book an appointment and we will map which path fits your situation before anything is filed.
How do we start?
Book an appointment. Once we agree on the work, a signed engagement letter and a 50% retainer place your return in the preparation queue. The retainer applies to your final invoice, and any unused balance is refunded.
How do I send documents and sign forms?
Through your TaxDome client portal: upload documents (PDF, Excel, Word, or photos from the app), complete your Tax Organizer, read and sign engagement letters, e-sign your e-file authorization, pay invoices, and message us — all in one secure place.
When is my balance due?
Your final invoice arrives through TaxDome, and the balance is due before e-filing — we do not e-file until the balance is paid in full. Our published filing deadlines are 3/15, 4/15, and 5/15; if your documents arrive after our deadline and you still want on-time filing, a $200 expedited fee applies.
How quickly will I hear back?
A tax professional will respond within 48 hours during business days. You can also call or text (626) 376-3324.
Understand More, Stress Less, File with Confidence.
Whatever border your life crosses next — a move, a company, an account, a backlog — bring it to the Enrolled Agent who handles it personally.
A tax professional responds within 48 hours during business days.