Salaries tax saving from home loan interest.
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Deductible interest
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Your breakdown
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A deduction, not a rebate: what this tool actually shows
Hong Kong lets owner-occupiers subtract the interest paid on a qualifying home loan from their assessable income before salaries tax is worked out. That is the point people miss. The relief does not hand you back the interest you paid to the bank. It removes that interest from the income the Inland Revenue Department taxes, so your benefit is the interest multiplied by the rate you would otherwise have paid on that slice of income. A taxpayer in a low band and a taxpayer in the top band can pay identical interest and walk away with very different savings.
This calculator models the deduction the way the IRD applies it: it caps the interest you can claim, then multiplies the allowed amount by the marginal band you select. The cap this calculator applies is $100,000 of interest per year of assessment, rising to $120,000 in any year in which you have a child born to you. You can claim in up to 20 separate years of assessment over your lifetime, and they do not have to run consecutively. Treat the $100,000 and $120,000 figures and the 20-year limit as the calculator's working assumption, and confirm the current numbers with the IRD before you file, because Budget changes can move them.
How your band drives the size of the saving
Salaries tax runs on a progressive scale, with successive $50,000 slices of net chargeable income taxed at rising rates, and a standard-rate cap that stops the bill ever exceeding a flat rate on your net total income. The IRD charges you the lower of the two. Because the home loan deduction comes off your income, its value tracks the rate on your top slice. At the 17 percent band a dollar of deductible interest is worth 17 cents; at the 2 percent band it is worth 2 cents. Note that Hong Kong taxes employment income only here. There is no capital gains tax on a later sale of the flat, no tax on dividends, and no GST, so this interest deduction is one of the few levers a salaried owner actually has.
Worked figures: $90,000 of interest at the top band
Take the calculator's default. You paid $90,000 in mortgage interest over the year, no child was born, and your top slice of income sits in the 17 percent band. The interest is below the $100,000 cap, so the whole $90,000 is deductible. The saving is the rate this calculator applies, 17 percent, times $90,000.
The same $90,000 at the 6 percent band would save only $5,400. That gap is the whole story of why high earners value this relief and basic-rate owners often barely notice it.
The mistakes that cost owners money
Three errors come up again and again. First, people claim the deduction in low-income years and burn one of their 20 entitlements for a tiny benefit. If you took a year of unpaid leave or were between jobs, the interest is often better saved for a higher-earning year, because the entitlement is counted in years, not dollars. Second, couples forget that only the spouse who is the registered owner and is paying the interest can claim, and that they can nominate the other spouse in some cases. Third, interest on a loan used to refinance or to buy a second non-residence property usually does not qualify, since the relief is tied to the dwelling you actually live in.
A practical tip: if your interest comfortably exceeds the cap every year, the marginal band you pick here is the only input that matters, so model your realistic top rate rather than an average. And if a child arrives mid-year, switch the newborn answer to yes, because that single year carries the higher $120,000 ceiling.
Does claiming home loan interest reduce my MPF or change my take-home pay?
No. The deduction only affects your annual salaries tax assessment, which you settle through your tax return, not your monthly payslip. Your mandatory MPF contributions, set at 5 percent of relevant income from each side up to the monthly ceiling, are unaffected by it. The saving turns up as a smaller tax demand note, or a refund, after the year ends.
Can I claim both the home loan interest deduction and the domestic rent deduction?
Not for the same period. The home loan interest relief is for owners paying a mortgage on the home they occupy, while the domestic rent deduction is for tenants. If you bought partway through the year after renting, you may be able to claim each for the months it applied, but you cannot stack both on the same dwelling at the same time. Check the apportionment rules with the IRD.