Syncbook
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Syncbook
Organise annual income, applicable deductions and family dependants in one place.
Compare individual, couple and family allocation scenarios instantly.
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Amounts are rounded to whole dollars after you leave a field. Fractions below one dollar are dropped when calculating deductions and tax. Ownership percentages retain decimals and are applied proportionately.
The next-year budget uses the lower current-year scenario and each person’s income type, then deducts eligible tax already paid. The automatic estimate is for cash planning; once you receive a tax bill, you can enter the bill amount instead.
For a first job, new business or property rented for less than a full year, the Inland Revenue Department may annualise income when calculating provisional tax. Automatic mode does not annualise a partial-year amount, so use manual entry instead. Inputs in this section are kept separately for each year and mode during this page session and are cleared when the page is closed.
These figures are for cash-flow planning. Payment amounts and due dates are determined by your tax bill. Official information:Salaries Tax and Provisional Salaries Tax guide · Property Tax and Provisional Property Tax guide · Personal Assessment and holdover of Provisional Property Tax · Tax reductions and provisional tax paid
| Family member | Employment income | Positive sole-proprietorship profits | Property net assessable value | Family dependant allowances | Method used | Final tax | Allocation saving |
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Amounts are annual Hong Kong-dollar figures for the selected year. For rental property, enter your own share of each amount. For Home Loan Interest, enter total interest paid for the whole property for the year; the calculator apportions it by your ownership percentage and applies the relevant deduction cap. Partial-year residence, owning and renting in the same year, shared Domestic Rent caps for spouses, deduction transfers between spouses, jointly owned businesses / connected entities and double-taxation credits involve additional rules. Where relevant data is entered, the calculator may flag items to check and does not claim to identify every lawful option.
The calculator also provides a cash-flow budget for provisional tax after deducting creditable provisional tax already paid. It does not calculate penalties, surcharges, due dates or automatically apply for holdover / refund. Losses from prior years are accepted only as a verified amount available for use by the taxpayer in the current year; carry-forward is not calculated automatically. No one-off tax reduction for 2026/27 has yet been included in this calculator, so it is currently treated as zero. Input amounts are rounded to whole Hong Kong dollars; ownership percentages retain decimals. Proportionate amounts and deduction caps drop fractions below one dollar before tax is calculated on whole-dollar income, and each tax amount is truncated before totals are added. Official amounts remain subject to Inland Revenue Department assessment.
Form data is processed in this page’s memory and is not uploaded or written to website storage. Switching modes keeps each mode’s data during the current page session. The logo, styles and calculation code are included in the page, with no external analytics script.
This calculator is provided by Syncbook Limited for general information and tax-budgeting purposes.
This is not an official service of the Hong Kong Inland Revenue Department and does not submit a tax return on your behalf. Results are calculated from the information you enter, the selected year and the rules included in this version. They do not constitute tax, legal or professional advice for your individual circumstances.
Terms such as “lower”, “best allocation” or “tax saving” refer only to estimates within this calculator’s scope, entered eligibility and compared scenarios. They do not guarantee that every lawful option has been covered or that the Inland Revenue Department will accept a claim. Dependant eligibility, income classification, cross-year losses, transfer of deductions and other special circumstances must be confirmed separately from the actual facts.
Tax law, allowances, reductions and administrative arrangements may change. Calculation results, rounding and provisional-tax budgets may differ from an official assessment. Amounts payable, credits, refunds, holdovers and due dates are governed by applicable law and Inland Revenue Department notices. Check the latest official information before filing or making an important decision, and consult a qualified professional where appropriate.
Syncbook Limited aims to keep this tool accurate but does not guarantee that information is complete, current or entirely error-free. To the extent permitted by applicable law, Syncbook Limited is not liable for losses arising from use of or reliance on this tool. Nothing in this disclaimer excludes or limits liability that cannot lawfully be excluded or limited.
Income, employer labels, family details, dates of birth, deductions and calculation results you enter are processed only in the memory of the current browser page. Syncbook Limited does not receive, analyse, sell or provide these contents to third parties through this calculator. You may use nicknames and do not need to enter a Hong Kong Identity Card number, address or contact details.
This version does not load analytics, advertising or tracking scripts, does not use cookies, browser local storage or a database to save form contents, and does not automatically send network requests. The logo, layout and calculation code are provided directly by this page.
When switching among Individual, Couple and Family modes, data is kept only while the current page remains open. “Clear this page” clears all modes and payment data; reloading starts again. This tool does not control browser autofill, tab restoration or screenshots you save yourself. On a shared device, clear the page and close the tab when finished.
“Export PDF” uses the browser print function to format the current mode’s entered data and calculation results into a document; it is not uploaded to a server. The PDF may contain income and family details. You control how it is stored and shared; the tool does not send the PDF automatically.
External websites such as Inland Revenue Department pages open only when you actively click an external link. This tool does not attach form contents to those links. External websites and the hosting service that serves this page may process connection logs under their own policies. This policy covers this version of the calculator only and does not represent the privacy arrangements of other websites or services.
Provided by: Syncbook Limited