Rule 4 Protects the Bookmaker After a Late Withdrawal — at Your Expense

Editorial Team «Place bet Horse Racing» June 30, 2026 Reading time: 8 min

I had a place bet on a 7/1 shot at Newbury that should have returned about 30 pounds. Instead it returned 22. The difference was a Rule 4 deduction triggered by a short-priced favourite withdrawing after the final declarations. No one warned me. No notification popped up on the app. I discovered the deduction only when I checked my settled bets that evening and noticed the numbers did not match. That experience, repeated across thousands of bettors every week, is Rule 4 in action: a mechanism that adjusts the odds on all remaining runners when a horse is withdrawn too late for the market to re-form naturally.

Rule 4 — formally Tattersalls Rule 4(c) — exists because a late withdrawal changes the probability of every other horse in the race. If a 2/1 favourite is pulled out an hour before the off, the remaining horses are all more likely to win and place than their original odds suggest. Without an adjustment, the bookmaker would be paying out at prices that overstate the true odds. Rule 4 corrects this, but it does so entirely at the punter’s expense. Understanding how it works, how it applies to place bets specifically, and how to anticipate its impact is essential for any regular place bettor.

The Rule 4 Deduction Scale: What Comes Off Your Return

The deduction scale is fixed and published by Tattersalls. It is based on the Starting Price of the withdrawn horse — the shorter the price, the larger the deduction on remaining runners. The logic is that the withdrawal of a strong favourite affects the market more than the withdrawal of an outsider.

The scale runs from 90p in the pound (for a withdrawn horse priced at 1/9 or shorter) down to 5p in the pound (for a horse priced at 14/1 to 16/1). Beyond 16/1, no deduction applies. Here are the key thresholds that affect place bettors most frequently: a withdrawn 1/1 shot triggers a 45p deduction; a 2/1 withdrawal triggers 30p; a 4/1 withdrawal triggers 20p; and a 6/1 withdrawal triggers 15p. The deduction is applied to your return, not your stake. If your place bet returns 50 pounds and the deduction is 30p in the pound, you receive 50 x (1 – 0.30) = 35 pounds.

Multiple Rule 4 deductions can stack. If two horses are withdrawn from the same race at different times, each deduction applies to the remaining field, and the combined effect is calculated using a formula that multiplies the two individual reduction factors rather than simply adding them. Two 20p deductions do not produce a 40p combined deduction — they produce a 36p deduction (1 – (0.80 x 0.80) = 0.36). The stacking is slightly less punitive than simple addition, but in races with multiple late withdrawals, the cumulative deduction can still take a substantial chunk of your return.

How Rule 4 Applies to the Place Part of Your Bet

This is where confusion is most common, and where the impact on place bettors is most direct. Rule 4 deductions are applied to your place odds, not to the win odds from which the place odds are derived. If you have taken a place bet at 1/4 odds on a 12/1 shot, your place odds are 3/1. The Rule 4 deduction is applied to the 3/1 return, reducing it by the relevant percentage.

In practice, this means the deduction hits place bettors less in absolute terms but harder in relative terms. On a 10-pound win bet at 12/1 returning 130 pounds, a 20p Rule 4 deduction reduces the return to 104 — a loss of 26 pounds. On a 10-pound place bet at 3/1 returning 40 pounds, the same 20p deduction reduces the return to 32 — a loss of only 8 pounds in absolute terms, but 20% of the total return regardless of whether it is a win or place bet.

For each-way bettors, the deduction applies separately to the win half and the place half. Your win leg is reduced by Rule 4 applied to the win return; your place leg is reduced by Rule 4 applied to the place return. The place half absorbs the same percentage haircut but starts from a lower base, so the absolute pound loss is smaller. This is one reason why some bettors prefer place-only bets to each-way in races where a Rule 4 deduction looks likely: you are exposed to the percentage reduction but not doubling the stake across two legs where both are subject to the same deduction.

Worked Example: A Place Bet Before and After a Rule 4 Deduction

Let me walk through a realistic scenario from start to finish, because the numbers tell the story more clearly than any description.

You take a 20-pound place bet on Horse A at 10/1 win odds in a 16-runner handicap. Place terms are 1/4 odds, four places. Your place odds are 10/4, which simplifies to 5/2. If Horse A places, your return before any deduction is 20 x 3.5 = 70 pounds (50 profit plus 20 stake).

Two hours before the race, the 3/1 favourite is withdrawn. The Rule 4 deduction for a 3/1 withdrawal is 25p in the pound. Your adjusted return becomes 70 x (1 – 0.25) = 52.50 pounds. Your profit drops from 50 to 32.50 — a 35% reduction in profit from a single withdrawal that has nothing to do with your horse.

Now suppose a second horse — a 5/1 shot — is also withdrawn 30 minutes later. The Rule 4 deduction for a 5/1 withdrawal is 15p in the pound. The combined deduction factor is 1 – ((1 – 0.25) x (1 – 0.15)) = 1 – (0.75 x 0.85) = 1 – 0.6375 = 0.3625. Your return is now 70 x (1 – 0.3625) = 44.63 pounds. Profit: 24.63 — less than half of what you expected when you placed the bet.

The race now has 14 runners instead of 16. Whether the four-place terms still apply depends on the bookmaker’s policy — some revert to three places if the field drops below 16 after withdrawals, while others maintain the original terms. Check the specific operator’s rules before staking, because the loss of a paid place on top of a Rule 4 deduction is a double blow that can turn a winning selection into a losing bet.

One practical defence against Rule 4 is to delay your bet until closer to the off, after any late withdrawals have been announced. If you take your price at the five-minute mark and no subsequent withdrawals occur, no Rule 4 applies. The trade-off is that you may miss an early price that is longer than the SP — which is where BOG becomes relevant as an insurance policy. The full mechanics of how non-runners interact with place bet settlement, including void legs and refund rules, are covered in the non-runner rules breakdown.

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Prepared by the Place bet Horse Racing editorial staff.