Leaving TSMC Arizona: What Happens to Your 401(k)?

TSMC-specific foundation

The TSMC Arizona plan—not a forum post—controls the rollover choices

After leaving TSMC Arizona, the common paths are to keep the account in the plan when permitted, move eligible money to a new employer plan, complete a direct rollover to an IRA or take a distribution. The current plan determines minimum-balance rules, partial distributions, loan treatment and source availability. Public TSMC material does not provide enough detail to replace the termination packet.

TSMC Arizona publicly confirms a 401(k) retirement savings plan with employer contributions in recruiting material, but detailed Arizona match, vesting and distribution terms are not clearly available in the public materials we reviewed. Do not import TSMC Washington terms or forum claims into an Arizona decision.

Download the current summary plan description, latest statement, source-by-source balance and any termination packet. Confirm vesting, outstanding loans, minimum-balance rules, distribution forms and whether the plan accepts partial distributions.

IRS guidance describes four general choices after termination: leave the balance in the former employer plan when permitted, roll it to a new employer plan, roll it to an IRA, or take a taxable distribution. The plan document determines which choices and thresholds apply to a TSMC Arizona participant.

Leaving the balance can preserve plan features and avoid a rushed decision. A new employer plan may simplify accounts. An IRA may expand investment and planning flexibility. A cash distribution can trigger income tax and, depending on age and exceptions, an additional tax. Compare the features before initiating paperwork.

A former employee who returns to Taiwan may still be able to keep U.S. retirement assets, but account access, investment availability, tax reporting and future distributions can become more complicated. Do not close or transfer accounts simply because a move is approaching.

IRS guidance states that U.S. retirement-plan distributions to a foreign payee generally require 30% withholding unless documentation establishes U.S.-person status or another valid exception. Taiwan is not on the IRS list of U.S. income-tax treaties in force as of this review, so a Taiwan resident should not assume treaty-rate relief. Residence, tax status and account-provider policies are essential inputs before a distribution.

How the pieces interact

Compare destinations with future residence in view

An employee returning to Taiwan has an additional layer: provider policy, future tax status and foreign-payee withholding. A direct pre-tax-to-pre-tax rollover generally avoids current income inclusion, but a receiving U.S. institution may restrict services after a foreign address is added. Taking a check personally can create mandatory withholding and a rollover deadline even if the employee intended only to move the account.

Final wages, PTO, bonuses, relocation payments and investment sales can all arrive in the same year. A direct pre-tax-to-pre-tax rollover generally avoids current income inclusion, while a move from pre-tax money to a Roth IRA generally creates taxable income.

If the following year may have lower income, preserve optionality. Model the departure year and the next year before choosing a Roth conversion, large stock sale or cash distribution.

The useful question is which destination best preserves the features you need while supporting the next stage of the plan. That requires comparing fees, investments, creditor rules, age-based access, future Roth strategy, residence and the new employer plan.

An advisor who specializes in serving TSMC Arizona employees can help organize those comparisons before a direct rollover is initiated. Semiconductor Wealth can connect you with that experience. The form below is for general context only; plan documents should be shared later through an approved secure process.

Put the guide to work

Complete the TSMC 401(k) decision in the right order

Choose a destination only after identifying pre-tax, Roth, employer and loan balances; comparing fees, investments and withdrawal access; and confirming the future address policy. Preserve the account where it is until the receiving institution and transaction method are ready.

Use the sequence below as preparation, not as individualized advice. Current TSMC documents control employer benefits, and qualified tax or legal professionals should confirm decisions in their areas.

• Download the plan summary, statement and termination packet
• Confirm vesting and every contribution source
• Ask whether the plan permits the account to remain
• Verify the receiving institution and foreign-address policy
• Use a direct rollover when appropriate and retain confirmations
• Current summary plan description and termination packet
• Latest statement showing employee and employer sources
• Loan balance and repayment instructions
• Beneficiary designation