Write HK$10,001 in Chinese capital numerals. If you wrote 壹萬壹元整 you have written something an ordinary Chinese reader takes for eleven thousand dollars, and on a cheque that matters more than it looks, because when the words and the figures disagree it is the words that count. The correct wording keeps a zero: 壹萬零壹元整.
That missing character is the single commonest mistake in Chinese cheque wording, and it is not a human mistake — it is what almost every online converter does. We built the rules out as a reference and ran 29,877 amounts through four converters. Two of them dropped the zero on the same amounts, including ours, until we fixed it this week.
Before any of that, the two things worth knowing in the first ten seconds. You can write a Hong Kong cheque amount in English or in Chinese — both are accepted, you write one, not both. And under the Bills of Exchange Ordinance (Cap. 19), section 9(2), where a sum is written in words and also in figures and the two disagree, the sum denoted by the words is the amount payable. The Ordinance says nothing at all about which language or script you use. Everything below is the custom that has grown up around that one rule, not a body of law; your own bank's requirements are the ones that govern your cheque, and this is a guide rather than legal advice.
Seven amounts, written out
The rule is best learned in stages, with each example adding one complication.
| Amount | Chinese | What changed |
|---|---|---|
| HK$100 | 壹佰元整 | the plain case: digits, units, then the closing character |
| HK$105 | 壹佰零伍元整 | a zero inside the number becomes one 零 |
| HK$1,004 | 壹仟零肆元整 | two zeros in a row are still one 零 |
| HK$10,001 | 壹萬零壹元整 | the zero survives the 萬 boundary — this is the one that gets dropped |
| HK$100,000 | 壹拾萬元整 | no 零 is needed; a number never ends in 零 |
| HK$1,000.05 | 壹仟元零伍分 | dollars, then the 零 that marks the empty ten-cent place |
| HK$1,234.56 | 壹仟貳佰叁拾肆元伍角陸分 | no zeros, so no 零, and no closing character after 分 |
Four rules produce every line of that table. They come from the only clause-by-clause published rule set that these guides are ever based on—the People's Bank of China's 1997 regulation on filling in instruments and settlement vouchers. It is a mainland rule and it does not bind Hong Kong — but every Hong Kong guide is downstream of it, and its worked examples are the closest thing to an authority the practice has.
- A zero inside the number becomes 零, once. HK$1,409.50 is 壹仟肆佰零玖元伍角.
- A run of zeros is still one 零, however long, and wherever the four-digit boundaries fall. HK$6,007.14 is 陸仟零柒元壹角肆分.
- A number never ends in 零. HK$1,680.32 is 壹仟陸佰捌拾元零叁角貳分, and the rule prints 壹仟陸佰捌拾元叁角貳分 as equally correct — that one 零 is optional.
- The one that is not optional: when the ten-cent place is zero and the cent place is not, the 零 after 元 stays. HK$325.04 is 叁佰貳拾伍元零肆分. Most people get this one wrong; our own tool has always had it right.
The closing character goes after the dollars: 整 or 正, both in wide use, and after the cents nothing is written at all. On the cheque itself the words start tight against the pre-printed 港幣 or "HK dollars", with no gap — so you do not write 港幣 again yourself.
The zero that goes missing
Here is why HK$10,001 is the interesting rung. Chinese numbers are grouped in four digits, not three, and the tempting way to write a converter is to handle each four-digit group on its own and glue the results together. Do that and the zero that sits at the top of a lower group has nothing to attach to, so it vanishes at the seam.
We implemented the rules above as a reference generator, checked it against all six of the regulation's own worked examples, and then ran 29,877 distinct amounts through it and through four converters: our three and one widely used third-party site. Because the rule permits two spellings of some amounts, the reference returns a set and a converter counts as conforming if its answer is in the set; variant characters (叁 and 參, 元 and 圓, 整 and 正, simplified against traditional) were folded first, so what is being compared is structure, not script.
Our Hong Kong converter missed 3,236 of the 29,877 — 10.8 per cent — and every single miss, in every converter, was the same defect. No other class of error appeared at all. Sharpening it:
- Below HK$10,000 it was perfect: 10,000 whole dollars and all 100,000 cent values from HK$0.00 to HK$999.99, no errors.
- The first wrong amount is HK$10,001, and over every whole dollar up to a million, 98,901 amounts — 9.9 per cent — came out wrong.
- 891 of those put a bare digit straight after 萬, producing strings like 壹萬壹元 and 壹萬貳元 that a Chinese reader naturally reads as eleven thousand and twelve thousand.
- An independently written third-party site produced 18,981 misses over 200,000 whole dollars, confirming the defect is not unique to our own code.
It is a flaw in the idiom rather than in anybody's code, which is why independent programmers keep reproducing it. Our three converters now share one tested routine that carries the pending zero across the group boundary: the Hong Kong one, the Taiwan one and the mainland one, which are three different rule sets over the same arithmetic. If you use any other converter, HK$10,001 is the amount to test it with.
Eight guides, seven decisions, no agreement
The other reason people get stuck is that the published guidance contradicts itself, and nobody says so. We took eight published Hong Kong cheque guides and converters, plus our own tool, and filled in a grid: seven writing decisions, sixty-three cells, fifty-six of which the sources actually answer. There is not one decision on which every source that answers agrees.
| Decision | What the eight published sources do |
|---|---|
| the character for three | 叁 four times, 參 twice, 叄 once, "either, but don't mix" once |
| ten | 拾 five times, 壹拾 once; one site uses 拾 in its table and 壹拾 in its own converter |
| a hundred thousand | 壹拾萬 three times, 拾萬 twice, one site both ways |
| after the dollars | 元 five times, 圓 three times |
| the closing character | 正 only four times, 正 or 整 three times |
| the English whole amount | includes "Dollars" five times, omits it twice |
| where "Cents" goes | before the number four times, after it three times |
One guide states flatly that 叁 must not be written 參 while two others write 參 throughout. One site's prose insists on 圓 and gives 壹萬圓整 as its example, and its own converter emits 元正.
The only meaningful distinction is between cosmetic differences and the one that changes the amount. 叁 against 參, 元 against 圓, 整 against 正, 拾 against 壹拾 — these change no number. Hong Kong's own ten-dollar coin is inscribed 拾圓, which is a fair indication that the bare 拾 is at home here; the argument for 壹拾 is that a bare 拾 leaves a space in front of it where a digit could later be inserted, which is the same instinct the whole system exists to serve. Taiwan's central bank rule, which is itself marked as superseded, lists 參 rather than 叁 — so a Taiwan cheque and a Hong Kong cheque differ here. The missing 零, by contrast, changes the amount. That is the only one worth worrying about.
Twelve strokes against two
The capital numerals are an anti-forgery device and the mechanism is visible in the characters. 一 is one stroke; two more pen strokes turn it into 七. 壹 is twelve strokes and cannot be turned into anything. The Song scholar 程大昌 explained the principle in his own words — the replacements were picked for being the same sound with more strokes, 取聲同而畫多者, precisely because a dense character cannot be altered.
The story usually told is that the founding Ming emperor invented the system after a grain-revenue embezzlement scandal, and it is repeated with the date 1370. Two corrections. The case, 郭桓's, was 1385, and that is when compulsion arrived. But the forms themselves are far older: 顧炎武 attributed them to the Wu Zetian court, and documents using 壹匹 and 肆拾伍文 survive from 587, and 三拾日 from 664. The Ming contribution was to make them compulsory in state accounts, not to invent them — the characters had been available for some seven hundred years.
The surviving cheque is the big cheque
Does any of this still matter? We added up every month Hong Kong Interbank Clearing has published since January 1997 — 356 months of clearing volume and value. Over the twelve months to August 2026, 48.9 million cheques cleared, worth HK$5.76 trillion. Dividing those totals out gives roughly 134,000 cheques and HK$15.8 billion on an average day.
Volume has collapsed — down about two thirds from the 1997 peak, and in August 2026 cheques were 4.5 per cent of the items cleared across cheques and the Faster Payment System together. But the average cheque has grown, from around HK$82,000 in 1997 to about HK$118,000 over the past year. The cheques that survive are the large ones, and their average value sits squarely in the range where a dropped 零 turns ten thousand into eleven.
Two footnotes for anyone reaching for an e-Cheque instead. The Monetary Authority's own explanation is that the payer enters the figure and the bank generates the words, so the wording problem goes away entirely. And it also says, in as many words, that a printed-out e-Cheque is not something banks accept for deposit — it is a signed PDF, and printing it does not make it a cheque.
Section 9(2) is quoted from the Hong Kong e-Legislation text of Cap. 19, read on 24 September 2026; the four zero rules and their worked examples are clauses 五(一) to 五(四) of the People's Bank of China's 1997 regulation, 银发[1997]485号; the Taiwan comparison is the central bank's own rule for treasury-account cheques, which that page itself flags as no longer current; the ten-dollar coin inscription is the government's own. The 29,877-amount comparison, the nine-source grid and the arithmetic on the clearing series are ours, done on 24 September 2026 — the cheque totals are Hong Kong Interbank Clearing's published figures, the per-day numbers are our division of them. Where the sources disagree, we have reported the disagreement rather than settled it.
