Joint, Separate, or Personal? The Tax Choice That Saves Couples Thousands

The three options at a glance

• Separate assessment (分開評稅) — the default. Each of you files and is taxed on your own income, with your own allowances.
• Joint assessment (合併評稅) — your salary incomes are combined into one case, with the HK$264,000 married person’s allowance applied to the total. You both elect it on the return.
• Personal assessment (個人入息課稅) — a different lever entirely: it pools salary, rental and business income so allowances and the progressive rates apply to everything. Only relevant if one of you has income beyond a salary.

If you’d rather skip ahead: the free calculator runs all three options on your real numbers in about 90 seconds. The rest of this guide explains what it’s doing and why.

When joint actually wins

Joint assessment helps in exactly one situation: one of you earns less than your own allowances and deductions, so part of that allowance would otherwise evaporate. Combining the incomes lets the higher earner absorb the unused portion. Think career break, part-time year, studying, or a low-income stretch between jobs.

How much it helps scales with what would have gone unused. In the worked example below, HK$18,000 of leftover allowance turns into HK$3,060 of tax back. A spouse who earned very little all year leaves a much bigger gap to transfer, and unused deductions — MPF contributions from a few working months, say — travel across the same way. The bigger the gap, the stronger the case for joint.

When separate actually wins

When both of you earn comfortably past the HK$132,000 basic allowance, joint assessment has nothing to transfer — your combined allowances are the same either way. This year it goes one step further: the YA 2025/26 one-off reduction is capped at HK$3,000 per case. Separate assessment means two cases and two ceilings — up to HK$6,000 off between you. Joint means one case and one ceiling. For two-earner couples, separate is the comfortable default, and in 2025/26 it’s slightly better than usual.

There’s no trap in checking, either. Joint assessment only happens when both of you elect it on the return, fresh each year — nobody slides into it by accident. In practice the risk runs the other way: couples who would genuinely benefit never elect it, because the default feels safe and the form never insists.

When personal assessment wins

Personal assessment earns its keep when one of you pays tax that ignores allowances — most commonly property tax on rental income, or profits tax on a side business. Electing it folds that income in with your salary, where unused allowances and the 2%–17% progressive bands can reach it. If neither of you has rental or business income, you can skip this option without regret. It’s a fresh election every year — a prior-year tick doesn’t carry forward.

A real worked example — Catherine and Patrick

Catherine earns HK$60,000 a month and Patrick HK$55,000 — HK$720,000 and HK$660,000 a year. Each pays the capped HK$18,000 of mandatory MPF, with no other deductions. First, separate assessment.

Household total: HK$141,600. Now the same couple, assessed jointly: combined income HK$1,380,000, minus HK$36,000 MPF, minus the HK$264,000 married person’s allowance, leaves HK$1,080,000 of net chargeable income. Progressive tax on that is HK$165,600, minus one HK$3,000 reduction — HK$162,600.

Joint assessment would cost this couple HK$21,000 more. Two reasons: separately, each of them gets the cheap 2%–14% bands on their first HK$200,000 — jointly there’s only one set of bands — and separately they get two HK$3,000 reduction ceilings instead of one. Ticking the joint box out of togetherness is expensive sentimentality.

Now change one fact: Patrick takes most of the year off and earns HK$120,000. Separately, his income sits below his own allowance, so he pays nothing — but HK$18,000 of his allowance goes unused, and Catherine still pays HK$75,900. Jointly, that unused HK$18,000 shelters income that was being taxed at 17%.

Same marriage, different year, opposite answer. That’s the entire argument for re-checking annually instead of inheriting last year’s tick.

The decision tree

1. Does either of you have rental or business income? If yes, compare personal assessment before anything else.
2. Did the lower earner make less than about HK$150,000 this year? If yes — under the basic allowance plus their MPF — joint assessment is probably worth electing.
3. Do you both earn comfortably above the basic allowance? Stay separate, and enjoy both HK$3,000 ceilings this year.
4. Not sure which side of the line you’re on? That’s the comparator’s job — it’s free and takes 90 seconds.

If you got it wrong last year

You generally have one month from the date on a notice of assessment to object in writing — the notice itself states the deadline. A short letter (or eTAX message) saying you wish to object and elect the other assessment method is usually enough to start. Honestly, whether it’s worth doing depends on the size of the difference: for a few hundred dollars, many people let it go; for a few thousand, write the letter. If the window has long closed, the practical move is simply to choose correctly this year.

For the wider context — bands, every allowance, both deadlines — the full 2025/26 guide is the reference. And if dependent parents are part of your family’s picture, the sibling coordination guide pairs naturally with this one.