US Dividend Tax Calculator: After the 30% US Withholding, How Much More Does Taiwan Collect?

For a Taiwan investor, tax on US dividends comes in two layers. On the US side, 30% is withheld at source (there is no US-Taiwan tax treaty, so a W-8BEN cannot reduce it). On the Taiwan side, the dividend is treated as overseas income and runs through Taiwan's alternative minimum tax (AMT) under the Income Basic Tax Act. This calculator works out both layers at once: enter your dividend amount and your same-year overseas property transaction gains or losses, and it returns the US withholding, the Taiwan top-up, the total tax, and how to claim the credit with the Form 1042-S your broker mails you. It also spells out the three principles people most often get wrong: losses cannot offset dividends, only realized income is taxed, and remittance is not the taxable event.

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Calculation detail

Scenario comparison: total tax at different dividend levels

Holding your current exchange rate, property transaction gains and losses, other overseas income, and net consolidated income fixed, here is how the two layers of tax change as the dividend scales up:

Reading the result: three rules decide everything

1. NT$1M is a cliff: if whole-household overseas income for the year does not reach NT$1M, Taiwan counts none of it; once it reaches NT$1M, the full amount counts (not just the portion above the line). But the US 30% is withheld at source and has nothing to do with this threshold.
2. The NT$7.5M comes off the basic income amount: this tool simplifies it to "basic income amount = net consolidated income + counted overseas income." Note the common misunderstanding here: the full basic income amount also includes other categories, such as the portion of death benefits exceeding NT$30M (currently adjusted to NT$37.4M) on life and annuity policies where the beneficiary is not the policyholder, gains on unlisted share transactions, and non-cash donations (see "Three things this tool does not cover" below). The higher your salary, the more of the NT$7.5M of room your domestic income eats up. Basic tax = (basic income amount − NT$7.5M) × 20%, then compared against the regular consolidated income tax, with only the difference topped up.
3. The US 30% can be credited: because 30% is higher than Taiwan's 20% rate, a pure-dividend investor tops up 0 in the vast majority of scenarios, and the total tax is simply the US 30%. What Taiwan really bites on is overseas income that was never taxed abroad, most typically realized property transaction gains (the US does not tax nonresidents' securities capital gains). Try entering a few million in the "Overseas property transaction gain" field above and watch the Taiwan top-up appear.

The three tax principles people most often get wrong

1. Losses cannot offset dividends, and cannot be carried to next year: overseas property transaction losses can only offset "same-year" overseas property transaction gains, an offset within the same category. If you lose NT$3M on a stock sale and collect NT$3M in dividends the same year, your overseas income is still NT$3M and that loss is forfeited entirely. A big loss this year and a big gain next year are each counted on their own. So one of the few legal planning moves for an overseas position is to arrange gains and losses to be realized in the same year and offset each other; both sides must be computed on actual cost, so keep your statements.
2. Only "realized" income is taxed; paper gains are not: the Taiwan side recognizes realized income. Hold without selling and no matter how much the position rises on paper it is 0; only a sale, a redemption, or an FX gain realized on conversion enters overseas income. A reminder in the other direction: holding for many years and then selling all at once concentrates many years of gains into a single year, and it is easy to blow past both the NT$1M and the NT$7.5M thresholds in one go, so spreading realizations across years is basic practice. US dividends are the opposite: they are withheld 30% the moment they are paid, with no choice about whether to realize.
3. Remittance is not the taxable event (people get this wrong in both directions): "if I leave the money in a US brokerage account and do not remit it to Taiwan, I do not have to report it" is wrong. Overseas income turns on the year of realization, not where the money sits; gains parked in an overseas account still count, and the tax authority's visibility keeps improving year by year through channels such as sub-brokerage filing data and the automatic exchange of financial account information (CRS, which covers non-US accounts). The reverse, "bringing the money home to Taiwan will get it taxed," is also wrong: the act of remitting is not itself income; what you bring home is your principal plus income already realized in prior years (which should have been reported in the year it arose), and it is not taxed again just because you remitted it. What you should do is keep your statements and your filing records over the years, so that on a large FX settlement you can explain the nature of the funds to the bank and the tax authority.

How to claim the US withholding as a credit back in Taiwan: five steps

1. Keep the Form 1042-S: US brokers mail it by March 15 each year (most can be downloaded from the broker's website). Confirm income code 06 (dividends) and the amount in the withholding field. Sub-brokerage investors should ask their Taiwan broker for the relevant withholding certificate.
2. At the May filing, complete the individual basic tax return: enter your overseas income into the basic income amount, compute the basic tax, and compare it with the regular consolidated income tax.
3. Enter the US withholding in the "foreign tax credit" field: converted to New Taiwan dollars at the payment-date rate or the annual average rate.
4. Attach the 1042-S as proof of tax paid in the source country: the tax authority may require additional documents where necessary.
5. Know the two limits: the credit cannot exceed "the incremental basic tax caused by adding the overseas income," and any excess is not refunded (Taiwan will not refund what the US over-withheld; whether you can get a refund from the US is a separate question, and for an ordinary retail investor a correct withholding leaves no room for a refund).

Three things this tool does not cover

• Distribution composition: this tool assumes the amount you enter is entirely ordinary dividend (30% withholding). For the interest-type distributions of bond ETFs (QII), the return of capital (ROC) from REITs and high-yield ETFs, and capital gain distributions from funds, US withholding ranges from 30% down to 0%; for your actual tax, break it out from the 1042-S.
• Progress on a US-Taiwan tax arrangement: the United States-Taiwan Expedited Double-Tax Relief Act in the US Congress (the House passed H.R. 33 on 2025-01-15; the Senate's S. 199 had not been voted on as of 2026-07-04) would, if it becomes law and takes effect on a reciprocal basis, cut individual dividend withholding to 15%. Until then, 30% is the reality; do not plan your investment math around 15% before it is law.
• Special items: separately taxed domestic dividends, certain insurance payouts, gains on unlisted share transactions, CFC income, and other items counted in the basic income amount all change the calculation and are not built into this tool. Also keep in mind the rule that where you cannot substantiate the cost of overseas securities, income is deemed at 20% of the sale proceeds.

For a fuller picture of the framework, pair this with two pieces: Is overseas income under NT$7.5M tax-free? Five myths, dismantled and the TSM ADR vs 2330 tax comparison (the ADR's 21% is Taiwan withholding, not foreign tax, so do not confuse the two).