Guide

Joint vs separate assessment in Hong Kong: which saves tax in 2025/26?

Last updated 6 October 2026 · By the calcisland editorial team

When both spouses work in Hong Kong, the tax return offers a “joint assessment” box. Whether to tick it depends on the gap between your incomes. This guide uses the Inland Revenue Department’s (IRD) own examples for the 2025/26 year of assessment. The arithmetic has been checked, and sources are listed at the end.

Our Hong Kong Salaries Tax Calculator 2025/26 does not calculate joint assessment for two earners. Its marital status option is labelled “Married — spouse has no assessable income” and is meant for a spouse with no taxable income (it applies the HK$264,000 married person’s allowance). Below, you run the calculator once per spouse for separate taxation, then work out joint assessment by hand.

How are married couples taxed by default?

Spouses are taxed as two individuals, each with the HK$132,000 basic allowance. All child allowances must be claimed by one spouse. The IRD suggests the higher earner, unless that spouse is taxed at the standard rate, in which case the other should claim. If your spouse has no income chargeable to salaries tax, you can simply claim the HK$264,000 married person’s allowance without electing joint assessment.

How is joint assessment calculated?

Joint assessment tax = (the couple’s combined net income − HK$264,000 married person’s allowance − child and other allowances) taxed at the progressive rates − the tax reduction (for 2025/26, capped at HK$3,000 for the couple).

1. Add the two spouses’ net incomes (each after their own deductions; MPF is capped at HK$18,000 per person).
2. Subtract the married person’s allowance (HK$264,000) plus child and other allowances.
3. Apply one set of progressive bands (2%, 6%, 10%, 14% on successive HK$50,000 slices, then 17%).
4. Subtract the 2025/26 reduction: 100% of tax, capped at HK$3,000 for the couple.

HK$264,000 is exactly two basic allowances, so joint assessment gives you no extra allowance. It only lets one spouse use the other’s unused allowance, at the cost of sharing a single set of low-rate bands. One notice of assessment is issued, usually to the higher earner.

How do you work out separate taxation with the calculator?

Run it once for each spouse without selecting “Married — spouse has no assessable income” (that is, as a single person), entering their own “Assessable income” and “Mandatory MPF contributions”. Enter “Children” only for the spouse claiming them. Add the two “tax payable” figures (each already net of its own reduction).

Shortcut for joint assessment: borrowing the “Married — spouse has no assessable income” option

That label says the spouse has no income, which isn’t true for a two-earner couple. We’re deliberately borrowing the option because it does the core joint-assessment steps: the HK$264,000 married person’s allowance, one set of bands, and a HK$3,000 cap per case.

1. Select “Married — spouse has no assessable income”.
2. “Assessable income”: the couple’s combined income.
3. “Mandatory MPF contributions”: the higher earner’s MPF (auto-capped at HK$18,000).
4. “Other deductions”: the other spouse’s MPF, no more than HK$18,000. This field isn’t capped, so overstating it understates the tax.
5. Fill in “Children” and “Of those children, born in 2025/26” as normal.

This is an estimate for typical incomes. The calculator wasn’t built for joint assessment and won’t cover every case (for example, each spouse’s other deductions and their caps). On the standard rate, IRD guidance (DIPN 18) says jointly assessed tax can’t exceed the standard-rate tax on the couple’s combined net income. We couldn’t find IRD or GovHK guidance on how the HK$5 million threshold of the two-tier standard rate (15%, then 16%) applies to a jointly assessed couple. If your combined income is very high and near the standard-rate zone, use the official GovHK tax computation tool instead.

How much does joint assessment save a high and a low earner? (IRD example)

Mr Chan earns HK$45,000 a month and Mrs Chan HK$10,000. They have one daughter, claimed by Mr Chan. Net incomes after MPF: 522,000 and 114,000.

• Separate: Mr Chan 522,000 − 132,000 − 130,000 = 260,000; tax 16,000 + 60,000 × 17% = 26,200, minus 3,000 = 23,200. Mrs Chan’s 114,000 is below her 132,000 allowance, so she pays nothing and 18,000 of allowance goes unused. Total 23,200.
• Joint: 636,000 − 264,000 − 130,000 = 242,000; tax 16,000 + 42,000 × 17% = 23,140, minus 3,000 = 20,140.
• Joint saves HK$3,060, which is the unused 18,000 × 17%.

Why does joint assessment cost more when incomes are similar? (IRD example)

Same family, but Mrs Chan earns HK$35,000 a month (net income 402,000).

• Separate: 23,200 + (270,000 → 27,900 − 3,000 = 24,900) = 48,100.
• Joint: 924,000 − 394,000 = 530,000; tax 16,000 + 330,000 × 17% = 72,100, minus 3,000 = 69,100.
• Joint costs HK$21,000 more. Of that, 18,000 is because the second HK$200,000 slice is taxed at 17% (34,000) instead of through its own low bands (16,000), and 3,000 is the lost second reduction. The IRD would assess them separately.

What if one spouse works part-time?

He earns HK$40,000 a month (net 462,000). She earns HK$7,500 a month part-time (MPF 4,500; net 85,500). No children.

• Separate: 330,000 → 38,100 − 3,000 = 35,100; she pays nothing, with 46,500 of allowance unused.
• Joint: 547,500 − 264,000 = 283,500 → 30,195 − 3,000 = 27,195.
• Joint saves HK$7,905 (46,500 × 17%).

Can joint assessment help when both spouses earn above the allowance?

Yes, because of child allowances. All child allowances must go to one spouse, and if that spouse’s income can’t absorb them, the excess is wasted under separate taxation.

Example: each spouse has net income of HK$310,000 (after MPF), with two children (HK$260,000 of child allowances).

• Separate: the claiming spouse has 310,000 − 132,000 − 260,000 < 0, so pays nothing, with 82,000 of allowance unused. The other has 178,000 → 9,000 + 28,000 × 14% = 12,920, minus 3,000 = 9,920. Total 9,920.
• Joint: 620,000 − 264,000 − 260,000 = 96,000 → 1,000 + 46,000 × 6% = 3,760, minus 3,000 = 760.
• Joint saves HK$9,160.

When should you elect joint assessment?

The three examples, 2025/26 tax after the reduction (HK$):

Rules of thumb:

1. One spouse’s net income is below HK$132,000: joint assessment probably helps, by roughly the unused allowance × the other spouse’s marginal rate.
2. Child allowances exceed the claiming spouse’s income (several children, moderate incomes): some allowance is wasted separately, so joint may help.
3. Both spouses would pay tax when taxed separately (no allowance unused): joint assessment almost never helps, and for 2025/26 it also halves the reduction.
4. Unsure? You can elect anyway. The IRD sets aside an election that would cost you more and taxes you separately.

How and when do you elect joint assessment?

Both spouses elect in Part 4.4 of their tax returns (BIR60) and both sign. The election is made each year, within the year of assessment or the following one, or within one month after the assessment becomes final and conclusive, whichever is later. Once withdrawn, it can’t be re-elected for that year. Couples with rental or business income should look at personal assessment instead, which is a different election.

FAQ

Is joint assessment always cheaper?

No. It mainly helps when separate taxation would leave allowances unused: one spouse earns less than the basic allowance, or the child allowances exceed the claiming spouse’s income. If both spouses would pay tax when taxed separately, joint assessment gives the couple a single set of tax bands and, for 2025/26, a single HK$3,000 reduction cap, so separate taxation is usually cheaper.

What happens if we elect joint assessment and it costs more?

The IRD compares automatically. If joint assessment doesn’t reduce the tax, the assessor sets the election aside, issues separate assessments and says so in a note on the assessment.

Does each jointly assessed spouse get the HK$3,000 reduction?

No. The 2025/26 reduction is 100% of tax, capped at HK$3,000 for the couple under joint assessment. Separately taxed spouses each have their own HK$3,000 cap.

My spouse has no income. Do we need to elect joint assessment?

No. If your spouse has no income chargeable to salaries tax, you can claim the HK$264,000 married person’s allowance directly without electing joint assessment.

Sources (checked 3 October 2026)

• IRD, Joint Assessment & Personal Assessment for Married Couples (2025/26 examples): https://www.ird.gov.hk/eng/pdf/ind_jae.pdf
• GovHK, Separate taxation or joint assessment for married couples: https://www.gov.hk/en/residents/taxes/salaries/salariestax/jointassessment.htm
• IRD, PAM 39(e): https://www.ird.gov.hk/eng/pdf/pam39e.pdf
• IRD, DIPN 18 (Revised), para. 26 (standard-rate ceiling under joint assessment): https://www.ird.gov.hk/eng/pdf/dipn18.pdf
• GovHK, Tax computation of salaries tax and personal assessment: https://www.gov.hk/en/residents/taxes/etax/services/tax_computation.htm
• IRD, PAM 61(e), August 2026: https://www.ird.gov.hk/eng/pdf/pam61e.pdf
• IRD, 2026-27 Budget tax measures: https://www.ird.gov.hk/eng/tax/budget.htm
• IRD, FAQ on 2026-27 Budget tax measures: https://www.ird.gov.hk/eng/faq/budget2026_27.htm
• GovHK, Allowances (child allowance claimed by one spouse): https://www.gov.hk/en/residents/taxes/salaries/allowances/allowances/allowances.htm

Related: Hong Kong salaries tax 2025/26 guide and MPF tax deduction limits. Run each spouse through the salaries tax calculator.

This article is general information, not tax or financial advice. Your IRD assessment is final. See the disclaimer.

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