The Vesting Clock: The Employer’s Last Offsetting Lever — and How to Set It Without Losing

Core proposition: Since 1 May 2025, employer mandatory contributions can no longer offset severance or long service payments. One lever survives: employer voluntary contributions (ERVC). But that lever has two mechanisms, not one. The contribution rate decides how big the pot gets; the vesting scale decides how much of it can actually be used to offset when an employee leaves. Set either one wrong, and a decade of contributions may cover less than half the leaving bill.

1. What remains after the offsetting rewrite

The Labour Department’s FAQ Q9 is unambiguous. For employees hired on or after 1 May 2025 (the transition date), employers cannot use mandatory-contribution accrued benefits to offset severance payment (SP) or long service payment (LSP) for post-transition service. But employer voluntary contributions and service-based gratuities can still offset SP and LSP, for service before and after the transition date alike. Mandatory contributions are closed; voluntary contributions are the only offsetting channel left standing.

The other number to hold in mind: SP and LSP accrue at two-thirds of monthly wages, with wages capped at HK$22,500 — so at most HK$15,000 per year of service, up to a total cap of HK$390,000. Twenty-six years of service hits the ceiling.

The first phase of full portability opens on 21 December, 57 days from today. Employees will be able to move their employer mandatory-contribution balances — but the voluntary-contribution pot does not travel with them. It stays in the employer’s scheme, governed by that scheme’s vesting rules. Before the gate opens, the vesting design is the thing employers should be re-checking.

2. Through the data: one vesting table, three fates

Vesting scales are set by the employer in the scheme participation agreement and vary between schemes. The standard template used across the market looks like this:

Run a concrete sandbox. An employee earns HK$30,000 a month (HK$360,000 a year). On top of the mandatory HK$1,500 a month, the employer pays a further 5% in voluntary contributions — HK$1,500 a month, HK$18,000 a year. The figures below count contributions only, excluding investment returns: they are the floor of the pot, not its ceiling.

Three conclusions, all uncomfortable. First, the first two years the pot is worth zero as a buffer: an employee who leaves within two years forfeits the entire HK$36,000, and the HK$30,000 leaving payment comes entirely out of cash — the pot helps not at all. Second, at year five it covers only 60%: HK$45,000 of vested money against a HK$75,000 bill. Third, only at year ten does it break even: the HK$180,000 pot clears the HK$150,000 bill, and the HK$30,000 surplus belongs to the employee, not the employer.

Compare the employer who pays no voluntary contributions at all: after ten years, the full HK$150,000 is a cash payment. The pot is not a free lunch — it is a leaving-payment reserve pre-funded at HK$18,000 a year for a decade.

3. The compounding cost: the longer the vesting clock, the later the buffer arrives

The vesting scale is also a retention chain. An employee who leaves at year two forfeits the whole HK$36,000; one who leaves at year four keeps 40% of a HK$72,000 pot — HK$28,800 — and leaves HK$43,200 behind. For the employer, a long vesting clock holds people. But viewed as an offsetting tool, a long clock postpones the buffer: redundancy waves rarely wait ten years.

Then the tax ceiling. Inland Revenue Department FAQ Q17 caps the employer’s profits-tax deduction for mandatory plus voluntary contributions at 15% of the employee’s total emoluments. In the sandbox: 15% of HK$360,000 is HK$54,000; mandatory HK$18,000 plus voluntary HK$18,000 totals HK$36,000, or 10% of pay — leaving HK$18,000 of deduction headroom. The contribution rate can rise to 10% before it hits the ceiling. That is the hard boundary of the design. Beyond it, the excess is not deductible, and lump-sum or special contributions must in any case be spread over five years for deduction purposes under section 16A of the Inland Revenue Ordinance.

One truth from the employee’s side deserves stating plainly: offsetting is not extra money from the employer. Vested voluntary contributions already sit in the employee’s account; using them to offset means paying the leaving bill out of the employee’s own retirement savings. The cash the employer saves is the same cash the employee’s retirement pot loses. That is not a moral judgement — it is arithmetic, and both sides should negotiate against the same table.

4. The fix: a design checklist for the three-way trade-off

Designing employer voluntary contributions means balancing three things at once: how fast the buffer builds, how hard it retains, and how much tax headroom remains. The practical checklist:

1. Match the rate to the accrual speed of leaving payments. For a HK$30,000-a-month employee, leaving payments accrue at HK$15,000 a year; a 5% voluntary rate puts in HK$18,000 a year, just above the accrual line. Below that rate, the pot never catches up with the bill; above a 10% rate, it hits the 15% tax ceiling.

2. Shorten the vesting cliff. The standard template pays 0% for the first three years — exactly when early-leaver waves need the buffer most. If turnover is high, consider graded vesting from year one (say 10–20% a year) so the pot becomes a real buffer sooner. The price is a shorter retention chain, to be compensated elsewhere in the benefits package.

3. Keep two ledgers in the conversation. The offsetting pot and the retirement benefit are the same money with two uses. Do not present voluntary contributions to staff as a pure benefit: show the vesting table, explain the offsetting mechanism, and let employees see that their years of service are tied to their own account. That transparency is what makes the vesting clock a retention tool rather than a resentment machine.

4. Review before the gate opens. From 21 December, employees can move their mandatory-contribution balances once a calendar year; the voluntary pot stays in the original scheme and does not move automatically. Check the vesting table and the contribution rate in the participation agreement, and confirm the pot is still the pot you think it is when the transfer wave arrives.

This week’s action list: ① Pull your scheme participation agreement and find the vesting table; ② Run the sandbox above for your own 3-, 5- and 10-year employees — vested pot versus leaving payment; ③ Measure the contribution rate against the 15% tax ceiling and see how much room is left.