The Answer in 60 Seconds

Two levers decide what you pay for commercial motor cover, and most SMEs read both of them wrong. The first is the excess: the fixed amount you pay out of your own pocket on each own-damage claim before the insurer pays the rest. It is not a single number. It stacks: a base excess on every claim, plus extra layers when a young or inexperienced driver was at the wheel, and again when an unnamed driver was driving. The second is the No-Claim Discount (NCD), which the General Insurance Association of Singapore describes as an entitlement earned when no claim is made under the policy for a year or more. NCD climbs a scale with each claim-free year and falls back after an at-fault claim.

Cover itself is not optional. The Motor Vehicles (Third-Party Risks and Compensation) Act 1960 requires every vehicle used on a Singapore road to carry at least third-party liability insurance. What you choose within that floor is how much risk you keep (the excess) versus how much you pay the insurer to carry (the premium). For a single vehicle or a small fleet, NCD usually attaches to each vehicle. For a larger fleet, insurers often stop tracking per-vehicle NCD and price the whole book on its combined claims experience, called fleet-rating or burning-cost. The trap is the same in both models: one at-fault claim rarely costs you only the excess. It collapses the discount and pushes the renewal premium up for years.

The Sourced Detail

Commercial motor pricing looks opaque because two mechanisms are working at once and they pull in opposite directions. The excess sets how much of each loss you absorb. The NCD or experience rating sets how your past losses feed forward into next year's premium. Understand both and the renewal stops being a surprise.

A note on sourcing before the detail. The statutory floor here is anchored to a primary source: the Motor Vehicles (Third-Party Risks and Compensation) Act 1960. The NCD definition is anchored to the General Insurance Association of Singapore. Beyond those, the mechanics below are market practice, not statute. There is no published regulation that fixes excess layers, NCD percentages, or fleet-rating formulas, and they vary by insurer. We describe how the levers work and deliberately quote no fixed market figures, because there are none to quote accurately.

What the excess actually is, and why it stacks

The excess (sometimes called the deductible) is the first slice of any own-damage claim that you pay yourself. If your windscreen and panel repair comes to a few thousand dollars and your excess is a few hundred, you pay the excess and the insurer pays the balance. On a third-party-only claim against you, the excess works the same way against the third party's repair where the wording applies it.

What surprises SMEs is that the excess is layered, not flat. A commercial motor schedule typically carries several excesses that add together on a single claim:

  • Base or standard excess. Applies to every own-damage claim regardless of who was driving.
  • Young or inexperienced driver excess. An additional amount when the driver was below a stated age or held a licence for fewer than a stated number of years. Commercial fleets that hire younger drivers carry this exposure on every shift.
  • Unnamed or unauthorised driver excess. An additional amount when the driver was not named on the policy, or fell outside the "any authorised driver" definition. This is where loose driver administration becomes expensive.
  • Specific peril excesses. Some wordings set separate excesses for windscreen claims, theft, or flood.

These are additive. A claim involving a 22-year-old relief driver who was not named on the schedule can attract the base excess, the young-driver excess, and the unnamed-driver excess at once. The total you absorb on that single claim can be several times the headline base figure. The exact amounts are insurer-specific and set out in your schedule, not in any public rate table.

The voluntary excess trade-off

Beyond the compulsory excesses, you can usually elect a voluntary excess: you agree to absorb more of each claim in exchange for a lower premium. The logic is simple. Small, frequent claims are expensive for an insurer to administer and price. If you agree to carry them yourself, the insurer prices off a thinner band of risk and the premium drops.

The trade-off is a cash-flow and frequency calculation, not a discount to chase blindly:

  • A higher voluntary excess lowers the premium but means you self-fund more of every incident. It suits a fleet with disciplined drivers and few small knocks, where the premium saving across the year outweighs the rare large excess.
  • A lower voluntary excess raises the premium but caps your out-of-pocket exposure per claim. It suits a fleet with frequent minor damage, where a low excess means the insurer absorbs the steady drip of small claims.

The hidden cost of a high voluntary excess is behavioural. When the excess is high, small claims become not worth claiming, so you pay them yourself and never report them. That keeps your NCD intact, which is often the real saving, but it also means your insurer sees an artificially clean record that can reverse sharply the first time a large claim lands. The excess and the NCD are not independent levers. They interact.

How NCD works, and how a claim cascades

The NCD rewards claim-free years. As the General Insurance Association of Singapore puts it, it is an entitlement earned when no claim has been made under the policy for a year or more. Each claim-free year moves you up a scale, and the discount applies to the renewal premium. The scale and its top step are set by each insurer, so we quote no percentages here.

The part that costs SMEs money is what happens after an at-fault claim. The cascade typically runs in three stages:

  1. You pay the excess on the claim itself, including any stacked young-driver or unnamed-driver layers.
  2. Your NCD steps down or resets. A single at-fault claim usually knocks the discount back by one or more steps, sometimes to zero. The discount you spent years building can be undone in one renewal.
  3. The base premium is re-rated upward. Separately from the NCD, the insurer now sees a worse claims record and may load the underlying rate. So the renewal premium rises on two counts at once: a smaller discount applied to a higher base.

This is why a claim that costs the insurer a modest repair can cost you far more over the following years through lost discount and a higher rate. The repair is a one-off; the NCD and rating effect is a multi-year tail. An SME weighing whether to claim a borderline small loss should price that tail, not just the repair.

Some insurers offer NCD protection, an add-on that lets you keep your discount through one or a limited number of claims. It does not protect the base rate from re-rating, only the discount step. Whether it is worth the extra premium depends on your claims frequency, and that is a calculation your adviser can run against your record.

Why fleets are priced differently

For a single commercial vehicle, the NCD model above applies cleanly: that vehicle earns and loses its own discount. The same holds for a very small fleet, where each vehicle typically carries its own NCD and its own claims history.

Once a fleet reaches a certain size, insurers usually abandon per-vehicle NCD and price the whole fleet on its combined claims experience. This is variously called fleet-rating, experience-rating, or burning-cost. The mechanism: the insurer looks at the total claims the fleet generated over a rolling period (commonly two to three years), expresses it as a loss ratio against premium paid, and sets the renewal rate off that figure rather than off any one vehicle's record.

The consequences are different from per-vehicle NCD in ways SMEs misjudge:

  • There is no individual NCD to lose, but the whole fleet's record moves together. A single bad vehicle or a single reckless driver pulls up the loss ratio for every vehicle. You cannot quarantine the damage to one schedule line the way individual cover can.
  • Pricing smooths but also persists. A fleet running a low, stable loss ratio sees steady, often favourable renewals. A fleet that has a bad year carries that year in the rolling experience for two or three renewals, not one.
  • Frequency matters as much as severity. Burning-cost rewards a fleet that prevents the steady stream of small claims, because every claim, large or small, feeds the loss ratio. This is why disciplined small-claims management and a sensible excess structure compound into real renewal savings on a fleet.

The structural choice between fleet-rating and per-vehicle cover, and the break-even point where one overtakes the other, is its own decision. We cover it in annual fleet rated versus individual vehicle commercial motor cover. The point here is narrower: the way your claims feed forward into next year's premium depends on which model you are in.

The liability limit sits underneath all of this

Excess and NCD govern your own-damage and renewal cost. They sit on top of a separate question: how much third-party liability cover the policy carries, and how that limit is structured. A motor liability policy can express its limit as a single combined amount or split it across bodily injury and property damage, and the structure changes how a large third-party claim is covered. That interacts with pricing but is a distinct lever, covered in combined single limit versus split limit motor liability.

Common Mistakes

  1. Reading the excess as one number. The base excess is only the first layer. Young-driver and unnamed-driver excesses stack on top, and a single claim can trigger all three.

  2. Chasing a high voluntary excess for the premium saving alone. The saving is real, but a high excess means you self-fund every small knock. If your fleet has frequent minor damage, the year's worth of unclaimed repairs can exceed the premium saved.

  3. Treating a claim as costing only the excess. The larger cost is usually the NCD step-down plus the upward re-rating of the base premium, paid over the following years, not the one-off repair.

  4. Assuming fleet-rating has an NCD to protect. Once you are experience-rated, there is no per-vehicle discount. The whole fleet's loss ratio drives the renewal, so one bad driver lifts the price on every vehicle.

  5. Letting unnamed drivers operate without checking the excess and cover position. A driver outside the "any authorised driver" definition can attract the unnamed-driver excess and, in some wordings, jeopardise the claim entirely.

  6. Buying NCD protection and thinking the renewal is safe. Protection preserves the discount step through a limited number of claims. It does not stop the insurer re-rating the base premium upward after a bad year.

  7. Reporting every small claim reflexively. A borderline small loss claimed may cost more in lost NCD and re-rating than paying the repair yourself. The arithmetic is worth running before you notify.

What This Means for Your Business

If you run commercial vehicles, treat the excess and the NCD as the two dials you actually control, because the premium is largely a function of both.

Start with the excess structure. Read your schedule and find every excess layer, not just the headline figure. Know your young-driver and unnamed-driver excesses, because those are the ones that detonate on the claims you least expect. Then decide your voluntary excess deliberately against your real claims frequency: if your drivers are disciplined and small knocks are rare, a higher voluntary excess can pay for itself; if minor damage is a steady fact of your operation, a lower excess keeps the insurer carrying it.

Then manage the NCD or experience tail. On a small fleet, protect each vehicle's discount by being deliberate about which small claims you report. On a larger, experience-rated fleet, the lever is fleet-wide claims discipline: every claim, large or small, feeds the loss ratio that sets your rate for the next two to three renewals, so preventing the small ones compounds into real savings. Either way, the cost of an at-fault claim is a multi-year figure, not a one-off repair, and that is the number to weigh before you claim.

When a claim does happen, the mechanics of reporting it cleanly matter for both the payout and the record. Our walkthrough on how to file a motor insurance claim in Singapore sets out the steps.

Covarage helps with the part that quietly erodes the saving: keeping your motor schedules, excess structure, and renewal-experience reports organised in one place, with renewal reminders before the policy lapses, and a route to a licensed adviser when you want the excess-versus-premium and NCD trade-offs priced against your actual record.

Questions to Ask Your Adviser

  1. What are all the excess layers on our schedule, including young-driver, unnamed-driver, windscreen, and theft, and how do they stack on a single claim?
  2. For our claims frequency, would a higher voluntary excess save more in premium than it costs us in self-funded small claims?
  3. Are our vehicles on per-vehicle NCD or are we fleet-rated on combined experience, and what changes if our fleet grows or shrinks?
  4. After one at-fault claim, what happens to our discount and our base rate, and over how many renewals does the effect persist?
  5. Is NCD protection available and worth it for our record, and what exactly does it protect against?
  6. How is our loss-experience report compiled, and what can we do over the next year to improve the figure that drives our renewal?
  7. Which of our drivers fall outside the "any authorised driver" definition, and what excess or cover consequence follows if one of them has a claim?

Related Information

Published 31 May 2026. Source verified 31 May 2026. COVA is an introducer under MAS Notice FAA-N02. We do not recommend insurance products. We provide factual information sourced from primary regulators and route you to a licensed IFA who can match a policy to your specific situation.