Question 1

What happens to my PDF?

Accepted Answer

It is read in this browser tab and forgotten when you close it. The file is never uploaded — not the document, not its name, not its contents. Since it never leaves your device, there is nowhere for it to be stored.

Question 2

Does it work without an internet connection?

Accepted Answer

Yes, once the page has loaded. Your notice is read and the tax worked out on your own machine, so no connection is needed for any of it.

Question 3

Where do the tax figures come from?

Accepted Answer

From four Inland Revenue and GovHK publications, which are cross-checked against each other when the data file is built. If they disagree, the build refuses to produce one. Every source is listed at the bottom of the calculator with its checksum.

Question 4

Why does it say a tax reduction is “not announced”?

Accepted Answer

A year’s reduction is set by the following February’s Budget. Until then there is no figure, so none is applied and you are asked to enter one. Copying last year’s number would quietly change your result.

Question 5

My notice does not read correctly. What now?

Accepted Answer

Check the comparison table at the bottom. If a line disagrees with the notice, the reading is wrong rather than the Inland Revenue Department, and the amount of the difference usually identifies which row was missed. Scanned or photographed notices cannot be read at all, as they contain no text.

Question 6

Is this tax advice?

Accepted Answer

No. It reproduces published arithmetic. It knows nothing about joint assessment elections, personal assessment, losses, or your circumstances.

Question 7

What exactly do you count?

Accepted Answer

How many notices this site has read, and nothing else. One total per day, added to by an empty request. Your file never leaves your browser, so there is nothing about it to count. The number is a rough gauge of use, not a precise statistic — the endpoint takes no credentials, so anyone determined to inflate it can.

Question 8

Which years are covered?

Accepted Answer

From 2020/21 to 2027/28, which is what the Inland Revenue Department’s published tables cover. Earlier years used a different band structure and are left out rather than guessed at.