Illinois millionaire’s tax: what it means for US expansion and state choice伊利诺伊州百万富翁税：对在美扩张和州选择意味着什么

Illinois’ proposed “millionaire’s tax” has reignited a perennial question for company founders and CFOs weighing US expansion: how do state-level tax changes affect where you locate personnel, IP, holding companies, and headquarters? Testimony summarized by the Tax Foundation argues the tax would hit small businesses, reduce competitiveness, and prompt outmigration — outcomes that matter to cross-border groups deciding whether to land in Illinois, Delaware, or elsewhere.

What happened and why founders should care

The Illinois proposal would raise top marginal income tax rates for high earners and create new administrative burdens for employers. Beyond headline rates, the policy could change employer withholding, payroll planning, and nexus calculus. For founders operating across the US-China-Hong Kong-Singapore corridor, state-level changes translate into real operational costs: higher effective tax on founder compensation, increased hiring costs, and incentives to move roles or legal domicile out of Illinois.

State taxes influence not just take-home pay but entity structure. High personal rates can push founders toward corporate profit retention, different distributions, or alternate compensation (equity vs salary). For investors and acquirers, predictable state tax treatment matters in valuation and due diligence; sudden tax increases are a risk factor in cross-border M&A. See our guidance on cross-border M&A advisory support for transaction-level impacts.

Practical structuring implications

1) Entity location: For a US-opco, many China-outbound founders choose a Delaware C-Corp for fundraising and investor familiarity. Delaware incorporates neutral corporate law and predictable courts; if Illinois tax bites, Delaware incorporation plus out-of-state management can limit Illinois tax exposure. Our Delaware C-Corp setup for foreign founders guide walks through franchise tax mechanics and board residency considerations.

2) State nexus and foreign qualification: Incorporating in Delaware is not a shield from Illinois taxation if you have employees, sales, or management physically in Illinois. You must foreign-qualify with the Illinois Secretary of State and register for state withholding. If you want to avoid Illinois nexus, work through remote management, location of payroll, and apportionment rules—but document commercial substance carefully.

3) Holding company choice: Singapore or Hong Kong holding companies remain attractive for treaty access and regional cash management. Use our cross-border corporate structuring for SG and HK founders—note: anchor text must match exactly; ensure placement is compliant—[editor’s note: use the exact anchor in your final layout]. If a China ultimate owner is involved, remember ODI and SAFE considerations for outbound equity and capital flows.

4) Compensation design and withholding: Increased top marginal rates encourage founders to revisit salary vs equity mix. Consider deferred compensation, option exercises, and timing of income recognition. If you have US employees, ensure payroll systems are configured for possible higher withholding and state-level supplemental rate changes.

Jurisdictional mechanics you must tick off

Delaware franchise tax: If you set up a Delaware C-Corp, calculate annual franchise tax early — large authorized shares can create surprisingly large bills. File the Delaware Annual Report and pay franchise tax by March 1 (subject to change), and budget for potential expedited filings if investor timelines are tight.

EIN and ITIN process: US entities need an EIN to open bank accounts and hire staff. Foreign founders without an SSN must obtain an ITIN only if they have US tax-filing obligations; otherwise use the EIN application (Form SS-4) with a foreign principal. Expect bank KYC delays for foreign owners; prepare passport, proof of address, and corporate documents.

Foreign investment filings (China): If funds or equity flow from onshore China, coordinate MOFCOM/SAFE ODI procedural checks for outbound direct investments and any tax treaty benefits. Failure to lodge ODI/SAFE filings can block repatriation and create compliance risk on exit.

Singapore/Hong Kong mechanics: If you route a holding company through Singapore, ensure ACRA filings and annual returns are up to date, and review IRAS incentives for treasury or finance company activity. Hong Kong groups should review IRD guidance on substance and offshore income claims. These administrative steps keep treaty relief and preferential regimes intact.

Tax planning levers to consider now

- Reassess apportionment: State apportionment formulas (sales, payroll, property) determine how much income is taxable in Illinois. Shift payroll or property where commercially sensible to change apportionment.

- Review compensation timing: Delay or accelerate income recognition where appropriate; use equity compensation structures recognized as deferred for state tax purposes.

- Use a regional holding with documented substance: Singapore or Hong Kong holding companies with real offices and directors help preserve treaty benefits and repatriation flexibility; coordinate with transfer pricing and GILTI planning.

- Pre-transaction diligence: If you plan M&A into or out of Illinois, quantify incremental state tax exposure in deal models and consider indemnities or purchase price adjustments. Our international tax planning and US-China treaty optimization work routinely models these scenarios alongside transfer pricing and GILTI implications.

YZ CPA Advisory View

For Singapore, Hong Kong, and China-outbound founders, the Illinois tax debate underscores why state-level risk must be priced into your US market entry plan. Prioritize entity location, payroll nexus, and holding-company substance now rather than after a tax change forces a restructuring. Simple steps—Delaware incorporation, clear payroll location, and a Singapore/Hong Kong holding with proper ACRA/IRD filings—buy you optionality.

中文摘要

伊利诺伊州“百万富翁税”可能提高创始人和高管的边际税率，影响用工和实体选址决策。对计划在美扩张或跨境布局的公司，应尽早评估州税显性与隐性成本，通过德拉瓦公司设立、控股地选择及薪酬与税务设计来降低风险。

To discuss how these developments affect your cross-border operations, schedule a consultation with YZ CPA Advisory or explore our international tax planning and US-China treaty optimization service.