The 30/50 rule: the investor test that penalises your investors, not the fund

What the rule actually is

The 30/50 rule caps how much of a fund a single resident, non-individual investor — together with its associates — may beneficially own. Below 10 investors, the cap is 30% of the fund's issued securities (or, for a trust, the total value of the trust fund; for a 13OA limited partnership, the equity interest). At 10 or more investors, the cap rises to 50%. An investor exceeding the applicable cap on the relevant day becomes a "non-qualifying investor" — and the consequence is not a threat to the fund's tax exemption. The fund keeps its award. Instead, the non-qualifying investor becomes liable to pay a financial penalty to the Comptroller of Income Tax (CIT) on the income it derived from the fund that year. Two investors count as associates if one beneficially owns, directly or indirectly, at least 25% of the other, or a third entity owns at least 25% of both; individuals are never associates of anyone, and the rule never touches individual investors at all — only resident, non-individual ones.

What a breach actually costs

Annex 10 of the circular sets out the computation precisely:

Financial Penalty = A × B × C

• A — the percentage of the fund beneficially owned by the non-qualifying investor on the relevant day.
• B — the qualifying fund's income for the basis period relating to that YA, per its audited or certified accounts.
• C — the corporate tax rate applicable to that YA.

The penalty approximates the corporate tax the investor would have paid on its slice of the fund's income had the fund never been exempt. It is charged to the investor's own return, never netted against the fund. The "relevant day" is broadly the last day of the fund's basis period for the YA, or the last day the fund enjoyed the exemption if it ceased to qualify partway through.

The CIT may grant a grace period of up to three months from the relevant day to cure a breach, but only where the investor shows it arose for reasons beyond its reasonable control. If the holding is not reduced within that window, the penalty is computed on the ownership percentage as it stood on the relevant day — not on whatever lower figure is reached later.

Fund managers carry the reporting load: the manager of an S13D, S13O or S13OA fund must issue each investor an annual statement (or publish the equivalent on its website) showing the fund's profit, its total value and the investor's holding, state in the offering document that non-qualifying investors must declare the penalty themselves, and separately declare any non-qualifying investors to the CIT on the Annex 2 template for any basis period in which the fund has one.

Which schemes carry it — and which one does not

Annex 10 states its own scope: it determines the penalty "for S13D, S13O and S13OA schemes." The 13O/13OA schemes carry the rule under Annex 6, and the 13D scheme carries its own version under Annex 9, with the same 30%/50% thresholds and associate test. Conspicuously absent is the 13U Enhanced-Tier Fund scheme — and the circular confirms it, listing a qualifying S13U fund as an automatically qualifying investor for 13O/13OA purposes. For a fund weighing the 13O/13OA versus 13U tracks, that is a real advantage on top of the higher S$50 million entry threshold: a concentrated cap table — a handful of large resident institutions, or a fund still raising its first close — is a structural risk under 13O/13OA and 13D that does not exist under 13U.

The 2025 waiver for 13D trusts and unit trusts

The circular records a targeted carve-out that has applied since Year of Assessment 2025. Under §5.1(b), the 30/50 rule is waived for investors of 13O/13OA funds that are themselves trusts or unit trusts incentivised under the S13D scheme ("S13D trusts and unit trusts") — so a S13D trust or unit trust is not discouraged from investing into a 13O/13OA fund purely because of its own size relative to the fund's cap table, and is instead treated as a qualifying investor outright. MAS applied the same logic in reverse under §6.3(b): the rule is also waived for S13D-trust or unit-trust investors in another 13D fund. Both waivers took effect from YA 2025 and carry forward, unchanged in substance, in this circular's Annexes 6 and 9 lists of qualifying investors.

Practical structuring notes

The rule rewards funds that treat their cap table as a live compliance input, not a one-time subscription record:

• Count investors continuously, not just at closing. The applicable cap depends on whether the fund has crossed the 10-investor line, which can change with every subscription or redemption.
• Track resident, non-individual holdings and their associates. The 25% associate test can pull two nominally separate investors into one combined position without either side realising it.
• Treat the relevant day as the test date, not an average through the year. A concentration cured beforehand does not trigger the penalty; one persisting to that day does.
• Weigh the 13U track where the investor base is concentrated. A small number of large resident institutions may cost less to manage under 13U's higher entry threshold than under indefinite 30/50 exposure on 13O/13OA.