The 15% Ceiling: After Offsetting’s Abolition, Every Dollar of Voluntary Contributions Over the Line Is Paid in After-Tax Dollars

Since 1 May 2025, when the MPF offsetting arrangement was abolished, employers’ mandatory contributions can no longer be used to offset severance or long service payments for post-transition service. The Labour Department’s thematic site states it plainly: accrued benefits derived from employers’ voluntary contributions can continue to offset both pre- and post-transition service. Voluntary contributions are now the only MPF offsetting lever an employer has left.

But that lever has a ceiling. The Inland Revenue Department’s FAQ Q17: employer regular and voluntary MPF contributions are deductible under Profits Tax, but “restricted to 15% of the total emoluments of the employee”. The MPFA’s own voluntary-contributions page confirms the same cap, mandatory and voluntary combined.

The data: where the ceiling bites

First, clear up the common misreading: 15% is a tax-deduction ceiling, not a contribution ceiling. You can contribute more than 15%. The excess simply buys no deduction — it is funded from after-tax dollars.

Employer mandatory contributions are 5% of salary, capped at HK$1,500 a month (HK$18,000 a year). Subtract the mandatory slice from the 15% ceiling and what remains is the voluntary-contributions headroom:

The pattern is clean: the higher the salary, the more the HK$18,000 mandatory cap compresses the mandatory slice, and the wider the tax-deductible VC headroom becomes. Lower-paid staff hit the wall at roughly 10% of salary; senior staff can run to 13–14%.

Meanwhile the offsetting need is compounding. Severance and long service payments accrue at two-thirds of monthly wages (capped at HK$15,000) times years of service, up to HK$390,000 in total. Every day of post-transition service adds to the liability the employer must now fund itself. Any employer building a voluntary-contribution buffer to hedge that liability will push contribution rates toward 10% and beyond — exactly the zone where the ceiling bites.

The compounding cost: the tax on generosity compounds too

The standard Profits Tax rate is 16.5%. Every dollar of non-deductible voluntary contributions costs HK$1.198 of pre-tax profit to fund (1 divided by 0.835).

Put the foregone tax shield on a compounding clock (illustrative, 7% gross return):

HK$100,000 a year over the line, and the thirty-year compounding cost of the lost shield is HK$1.56 million — more than fifteen years of the contributions themselves. That is not “over-contributing”. That is the tax code penalising generosity.

The playbook: two games, above and below the line

Below the ceiling, voluntary contributions are the employer’s cheapest dollar. Deductible, usable to offset severance and long service payments, and vesting terms can be written into the scheme’s governing rules (the law sets no mandatory vesting scale — the design is the employer’s call). One dollar doing three jobs. No substitute exists.

Above the ceiling, a pay rise is cheaper than more contributions. Salary is a general business expense, fully deductible with no 15% cap. At the margin: each dollar of excess VC needs HK$1.198 of pre-tax profit to fund, while HK$1 of salary costs HK$1 of pre-tax profit — above the line, voluntary contributions are 19.8% dearer than salary. The trade-off: salary vests immediately, has no vesting schedule, and cannot offset severance.

A third route is service-based gratuities: the Labour Department confirms these can also offset pre- and post-transition service, and as ordinary remuneration they carry no 15% cap. But gratuities are immediate cash outflows with no compounding and no long-term growth inside an MPF account.

One note for the employee side: benefits derived from employer voluntary contributions may be chargeable to Salaries Tax on payment, depending on the timing and manner of payment — employer generosity does not always arrive intact.

This week’s action list

1. Run the ratio once: total mandatory plus voluntary contributions divided by total emoluments — how many of your people are already near 15%?
2. Match it once: the contingent severance and long service liability on post-transition service against the coverage your voluntary-contribution buffer provides.
3. Ask once: your tax adviser to confirm the treatment of any excess contributions, and check the vesting terms in your scheme’s governing rules.