Seven Ways Import Tax Estimates Go Wrong in Taiwan

Import tax estimates rarely fail by a little. They fail by a factor, and almost always for one of the same handful of reasons. Each of the seven below has a predictable direction and a predictable size, which makes them easy to check for before the bill arrives rather than after.

Last updated:2026-08

One: using the goods price as the customs value

The most common error and the one with the largest effect. Customs value is goods price plus international freight plus insurance — not the sticker price.

	Goods price only, 5,000	Correct value, 6,560
Duty at 7.5%	375	492
Business tax	269	353
Total	644	845

A NT$201 gap from NT$1,560 of omitted freight and insurance. The error rate exceeds the omission rate because the omitted amount enters two tax bases.

See How customs value is calculated.

Two: applying 5% business tax to the goods price

Business tax is not 5% of what you paid. Under Article 20 of the Business Tax Act (加值型及非加值型營業稅法) it is computed on customs value plus import duties, and where commodity tax applies, on that total plus the commodity tax.

The direction is always the same: the real figure is higher than the estimate. The size depends on the duty rate — at 12% apparel duty, business tax is effectively 5.6% of customs value rather than 5%.

Three: treating the threshold as a deduction

Low-value relief is a threshold, not an allowance. Cross it and the whole customs value is assessed.

This produces the counter-intuitive result that a consignment at NT$2,001 can cost several hundred dollars more than one at NT$1,999 — a NT$2 difference in value.

Near the line, freight is what usually decides it. See The NT$2,000 de minimis threshold.

Four: forgetting the exemption has a count

Six exempt consignments per half-year, resetting on 1 January and 1 July. Most people discover the limit when the seventh parcel arrives with a bill.

The error here is not in the arithmetic but in the assumption — an estimate that assumes exemption when the allowance is spent is wrong by the entire tax. See Taiwan's six-time rule.

Five: omitting commodity tax

Seven categories carry commodity tax on top of duty: rubber tyres, cement, beverages, flat glass, oil and gas, electrical appliances, and vehicles.

Appliances and sweetened beverages are what catch personal shoppers. The commodity tax then enters the business tax base, so it is effectively counted twice — and on an appliance it can be several times the duty.

See Duty, business tax and commodity tax.

Six: estimating from an average rate

Taiwan's schedule has 12,594 lines with rates from 0% to over 500%, and within a category the distribution is often bimodal rather than clustered.

Category	Reality
Apparel	No zero-rated lines; almost everything at 12%
Electrical and electronic	Roughly half at 0%, remainder up to 15%
Books and printed matter	Entirely 0%

An average across a category that is half zero-rated and half at 10% describes almost nothing in it. See The complete HS Code guide and the Taiwan import tariff tables.

Seven: judging a consolidated box per item

The customs value of a consignment is combined. Three items of NT$800 boxed together form one consignment of NT$2,400, and the whole amount is assessed.

The error is usually a leftover habit from shipping items separately. See Taobao consolidation to Taiwan for the trade-off between the two approaches.

What a correct estimate looks like

Six steps, in order:

1. Customs value = goods + international freight + insurance
2. Check exclusions — tobacco, alcohol and quota agricultural goods never qualify for relief
3. Check remaining exemption counts for this half-year
4. Find the tariff rate by code, not by category average
5. Add commodity tax if the goods fall in one of the seven categories
6. Business tax on customs value + duty + commodity tax

Running the figures through the Taiwan import duty calculator handles the arithmetic; steps two, three and five are the ones that require you to know something the calculator cannot infer.

The pattern behind all seven

Every one of these errors moves in the same direction — the estimate is too low, never too high. That is not coincidence. Each involves omitting something that stacks: a component of the value, a layer of tax, or a condition on relief.

The practical consequence is that a rough estimate should be treated as a floor rather than a midpoint. If a purchase only makes sense at the estimated tax, it probably does not make sense.

Two more that are not arithmetic

Both of these produce a correct calculation of the wrong thing.

Estimating the tax but not the landed cost. Duty and business tax are one part of what a shipment costs to receive. Brokerage, storage, domestic delivery, the courier's duty-advance fee and the cost of an inspection delay are all real and none of them appear in a tax calculator. For a low-value consignment these frequently exceed the tax itself.

Assuming the goods can enter. A perfectly accurate tax estimate is worth nothing if the consignment is refused. Prior approvals — type approval for wireless devices, commodity inspection for chargers and appliances — cannot be obtained after arrival, and a refused shipment costs the goods plus storage plus return freight. See Importing phones and laptops and What you cannot ship to Taiwan.

The ordering matters. Check admissibility, then estimate cost, then optimise tax — reversing that sequence is how people end up with a precisely calculated figure for a parcel that is going back.

A worked check

A single consignment, run through the full sequence:

Step	Input	Result
Goods	4,200
International freight	850
Insurance	40
Customs value		5,090
Excluded category?	No	Relief available in principle
Counts used this half-year	6	Exemption unavailable
Tariff rate (by code)	12%	Duty 611
Commodity tax category?	No	—
Business tax	(5,090 + 611) × 5%	285
Tax total		896

Had the estimate stopped at "5% of 4,200," it would have said NT$210. The actual figure is more than four times that, and every step between the two is one of the seven errors above.

Further reading

For the full structure, see the Taiwan import tax guide. For buying from abroad, see Shopping overseas and importing to Taiwan.

Primary sources: Customs Act (關稅法), Commodity Tax Act (貨物稅條例) and Business Tax Act (加值型及非加值型營業稅法).

Frequently asked questions

What is the most common import tax mistake?

Using the goods price instead of the customs value. Customs value is the goods price plus international freight plus insurance, and omitting freight understates every layer of tax above it because the omitted amount enters two tax bases, not one.

Why is my business tax higher than 5% of what I paid?

Because the base is customs value plus duty, not the goods price. Under Article 20 of the Business Tax Act, business tax on imports is computed on customs value plus import duties, and where commodity tax applies, on that total plus the commodity tax.

Is the NT$2,000 threshold deducted from my customs value?

No. It is a threshold, not a deduction. A consignment at NT$2,001 is assessed on the full NT$2,001, not on the NT$1 above the line. This produces the counter-intuitive result that NT$2 more in value can cost several hundred dollars in tax.

Can I estimate using an average tariff rate?

Not reliably. Taiwan's schedule has 12,594 lines with rates from 0% to over 500%, and the distribution within a category is often bimodal rather than clustered. Apparel has no zero-rated lines at all while half the electronics lines are duty-free.

Does consolidating parcels change how the threshold is judged?

Yes. The customs value of a consignment is combined across its contents, so three items of NT$800 boxed together form one consignment of NT$2,400 and the whole amount is taxed. Judging per item after consolidating is a common error.