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

Before choosing a destination

Start with the documents that control your choices

You’re leaving TSMC Arizona, and your 401(k) suddenly has somewhere else it could go. Which choices are actually open to you—minimum-balance rules, partial distributions, loan treatment, which sources can move—is determined by the current plan document, not by anything you’ll read online.

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. Don’t import TSMC Washington terms or forum claims into an Arizona decision—your termination packet outranks them all.

So before you weigh destinations, assemble the file. Download the current summary plan description, your latest statement, a source-by-source balance and any termination packet, and confirm vesting, outstanding loans, minimum-balance rules, distribution forms and whether the plan accepts partial distributions. With those in hand, the four paths become a real comparison.

• The current summary plan description and your termination packet
• Your latest statement showing employee and employer sources
• Any loan balance and its repayment instructions
• Your beneficiary designation
• The new employer plan’s rollover-acceptance rules
• The country you expect to live in after departure

Four common paths

Your four options—and why none of them is urgent

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 you as a TSMC Arizona participant.

Each path buys you something different. Leaving the balance can preserve plan features and spare you a rushed decision. A new employer plan may simplify your accounts, while an IRA may expand investment and planning flexibility. A cash distribution can trigger income tax and, depending on your age and exceptions, an additional tax—compare the features before you start paperwork.

If your next chapter stays in the United States, that comparison may be all you need. If Taiwan is in the picture, there’s another layer.

If Taiwan is part of the next chapter

What changes when Taiwan is your next address

If you return to Taiwan, you may still be able to keep U.S. retirement assets—but account access, investment availability, tax reporting and future distributions can become more complicated. Don’t close or transfer accounts simply because a move is approaching.

Here’s how it plays out: provider policy, your future tax status and foreign-payee withholding all enter the analysis at once. A receiving U.S. institution may restrict services after a foreign address is added, and taking a check personally can create mandatory withholding and a rollover deadline even if you only meant to move the account.

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 don’t assume treaty-rate relief as a Taiwan resident. Your residence, tax status and account-provider policies are essential inputs before any distribution—and they sit inside a bigger exit-year tax picture.

Tax sequencing

The rollover is only one line on the exit-year return

Final wages, PTO, bonuses, relocation payments and investment sales can all arrive in the same year you leave. 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 next year may bring lower income, preserve your optionality. Model the departure year and the year after it before you choose a Roth conversion, a large stock sale or a cash distribution—and if the modeling raises more questions than it answers, that’s the signal to get help.

Where planning helps

The valuable question is not ‘IRA or 401(k)?’

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

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

Your move, in order

Make the 401(k) decision in the right sequence

Choose a destination only after you’ve identified the pre-tax, Roth, employer and loan balances, compared fees, investments and withdrawal access, and confirmed the future address policy. Until the receiving institution and the transaction method are ready, the safest place for the account is right where it is.

Treat this walkthrough as preparation, not as individualized advice—your current TSMC Arizona documents control the account’s actual terms, and a cross-border tax professional should confirm anything that touches two countries.

• Download the plan summary, your statement and the termination packet
• Confirm your vesting and every contribution source
• Ask whether the plan permits your account to remain
• Verify the receiving institution and its foreign-address policy
• Use a direct rollover when appropriate and keep the confirmations