Hong Kong Salaries Tax: Joint Election vs Personal Assessment 2027
Compare HK salaries tax under joint election (married couple combined assessment) vs personal assessment (each spouse separate) for 2026-27. Critical for couples with one high earner + one low/no earner — joint can save HK$15-50k annually through allowance pooling and bracket sharing.
When Joint Election Helps Most
Joint election (Section 10 of the IRO) combines both spouses' income into one assessment. The married person's allowance (HK$264k) replaces the two single allowances (HK$132k each) — neutral on allowances. But joint election lets the lower-earning spouse's unused mortgage interest, MPF, and child allowance flow to the higher earner. For couples with imbalanced income (e.g., HK$800k + HK$50k), joint can save HK$15-50k annually.
When Personal Assessment Wins
When both spouses earn roughly equal income (e.g., HK$500k each), personal assessment is usually equal or slightly better — each gets full benefit of single brackets and the standard rate cap (15%) applies separately. Joint adds no flexibility advantage in this case. Likewise, when both earn under the basic allowance threshold and pay no tax anyway, joint election is pointless.
Mortgage Interest Deduction Sharing
For a couple jointly owning a property, mortgage interest (capped at HK$100k/year) can be claimed by either spouse or split between them. The split should favor the higher earner if marginal tax rate differs. Under joint election, all goes to the joint pool. Under personal, plan ahead — the IRO allows up to 20 years of claims on the same property; missing optimal allocation each year leaves money on the table.
How to Elect
Election is made on the annual tax return (BIR60). You can elect joint or personal each year independently — there is no permanent lock-in. The IRD also computes both and applies the more favorable automatically if you explicitly mark "joint election" on the form. Smart taxpayers run both calculations and verify the IRD applied the lower one before paying.
Sources: mpfa.org.hk, ird.gov.hk, gov.hk, hkma.gov.hk. Last updated: May 2026.