Rule 4 Deductions Explained: Non-Runner Betting Rules UK

You back a horse at 8/1, it romps home by three lengths, and you collect your winnings. Except the payout is smaller than you expected. What happened? Almost certainly, Rule 4 deductions applied.

Rule 4 exists because horses sometimes withdraw after betting markets open. When a fancied runner scratches late, the remaining horses have better chances of winning than their original odds suggested. Without adjustment, anyone who backed the non-withdrawn runners would receive inflated returns based on outdated odds. The Tattersalls Committee established Rule 4 to address this, allowing bookmakers to make deductions that reflect the changed competitive landscape.

Understanding Rule 4 matters for anyone betting on horse racing in the UK. It affects both traditional wagers and free bet profits. As Alan Delmonte, Chief Executive of the Horserace Betting Levy Board, noted in the HBLB Annual Report 2024-25: “Average turnover per race was down by about 8% on 2023/24, representing a 15% fall on 2022/23 and 19% on 2021/22.” With tighter margins across the industry, knowing exactly how deductions work helps you calculate real returns before a race even finishes.

The Tattersalls Rule 4 Deduction Scale

The deduction amount depends on the odds of the withdrawn horse at the time of withdrawal. A heavily backed favourite scratching triggers a much larger deduction than a 100/1 outsider pulling out. The scale follows a set formula, expressed in pence per pound.

If the withdrawn horse was priced at odds of 1/9 or shorter, the deduction is 90p in the pound. At odds of 2/11 to 2/9, the deduction drops to 85p. Between 1/4 and 1/3, the deduction sits at 80p. At 2/5 to 8/15, it falls to 75p, while odds of 8/13 to 4/5 incur a 70p deduction. The scale continues downward: 4/6 to 5/6 takes 65p, 20/21 to evens takes 60p, and 6/5 to 6/4 takes 55p.

The middle ranges are where most significant withdrawals occur. Odds of 13/8 to 7/4 mean a 50p deduction, while 15/8 to 9/4 drops to 45p. Between 5/2 and 3/1, the deduction is 40p, at 10/3 to 4/1 it falls to 35p, and 9/2 to 11/2 triggers 30p. For horses priced 6/1 to 9/1, expect a 25p deduction. The scale tails off from there: 10/1 to 14/1 means 20p, 16/1 to 22/1 means 15p, 25/1 to 33/1 means 10p, and anything from 40/1 outward triggers just 5p in deductions.

When multiple horses withdraw, their deductions add together, though total deductions are capped at 90p in the pound. If three runners scratch and their combined deductions would equal 110p, you still only face a 90p deduction. This prevents the unlikely scenario where deductions exceed your entire winnings.

The timing of withdrawal matters. Rule 4 only applies if you placed your bet before the horse was officially withdrawn. If a horse scratches at 2pm and you place your bet at 3pm, no deduction applies to your wager because the market already reflected that horse’s absence. Ante-post bets are typically not subject to Rule 4, though they carry their own non-runner risks depending on each bookmaker’s terms.

Different bookmakers display Rule 4 deductions in slightly different formats. Some show the deduction scale explicitly on bet slips, while others simply inform you that deductions may apply to certain markets. The calculation itself follows the Tattersalls standard across all licensed UK operators, so the actual deductions are consistent even if presentation varies.

How Deductions Affect Your Returns

Abstract percentages become clearer with specific examples. Consider a £10 win bet on a horse at 5/1. Under normal circumstances, a winning bet returns £50 profit plus your £10 stake, totalling £60. Now suppose another horse in the race, priced at 3/1 when you placed your bet, withdraws an hour before post time.

A 3/1 withdrawal triggers a 40p in the pound deduction. Your £50 profit gets reduced by 40%, or £20. Your actual profit becomes £30 rather than £50. With your stake returned, you receive £40 total instead of the £60 you might have expected.

The deduction applies only to winnings, not stakes. This distinction matters when calculating returns. You always get your stake back on a winning bet, but the profit portion shrinks according to the deduction scale. On a losing bet, Rule 4 is irrelevant since there are no winnings to deduct from.

Multiple withdrawals compound the effect. Imagine the same race, but now two horses withdraw: one at 3/1 (40p deduction) and another at 7/1 (25p deduction). The combined deduction is 65p in the pound. Your £50 profit becomes £17.50. This scenario is relatively rare but not unheard of during bad weather or when injuries emerge during pre-race preparation.

Place bets and each-way wagers are similarly affected. If you have an each-way bet and only the place portion wins, any Rule 4 deduction applies to the place winnings. The calculation uses the same scale regardless of bet type. Some punters forget this when celebrating a place finish, only to find the payout smaller than anticipated.

Starting Price bets present a slightly different situation. Because SP is determined at the moment the race begins, it already accounts for any withdrawals. If you take SP rather than a fixed early price, Rule 4 deductions typically do not apply because the odds reflect the final field. This is one reason some punters prefer SP for volatile markets where late withdrawals seem likely.

Rule 4 and Free Bet Winnings

Free bets are affected by Rule 4 in the same way as cash bets, but the impact feels more acute because you are working with house money. When extracting value from a free bet, every penny of profit matters. A substantial Rule 4 deduction can significantly reduce what you walk away with.

Take a £20 free bet placed on a horse at 6/1. Under normal conditions, this returns £120 profit (most free bets are stake not returned, so you receive winnings only). If a favourite at 2/1 withdraws before the race, triggering a 60p deduction, your profit drops to £48. That is a meaningful difference, especially if you were counting on the full amount.

For matched bettors, Rule 4 introduces a complication. The lay bet on an exchange is not subject to Rule 4 because exchanges treat non-runners differently. If the horse you backed with a free bet wins after a Rule 4 applies, you receive less from the bookmaker than you owe to the exchange. This creates an unexpected loss on what should have been a balanced position.

The solution is awareness and selectivity. Checking declared runners close to race time reduces Rule 4 risk. Avoiding markets with known injury concerns or unsettled weather helps. Some matched bettors specifically target races with full, confirmed fields to minimise variables. Others build a Rule 4 buffer into their calculations, accepting slightly lower theoretical returns in exchange for more predictable outcomes.

Bookmaker promotions sometimes address Rule 4 explicitly. Non-Runner No Bet offers protect against complete voidance if your selection withdraws, though they do not protect against deductions caused by other horses scratching. Reading promotional terms carefully clarifies what protection, if any, applies to your specific free bet.

Checking Horse Status Before You Bet

Prevention beats calculation. Knowing whether horses are likely to run before placing your bet eliminates most Rule 4 surprises. Several resources help with this.

Bookmaker websites and apps display runner status in real time. Horses marked as non-runners or withdrawn are clearly indicated on race cards. This information updates throughout the day as trainers make final decisions. Checking closer to race time gives you the most accurate picture, though it also means less time to find optimal odds.

Racing industry sources provide additional context. Trainer comments on doubtful runners, going concerns for certain horses, and veterinary inspections all signal potential withdrawals. The Racing Post and At The Races cover these developments, particularly for feature races where scratches attract attention. Following these updates takes time but can save money over a betting session.

Weather plays a significant role in withdrawal patterns. Soft ground specialists may scratch when conditions turn firm, and vice versa. Heavy rain before a meeting prompts late changes as trainers protect horses from unsuitable going. Festival days with crowded fields see more withdrawals simply due to the number of declarations. The Grand National, with its safety reviews and large field, historically sees several non-runners between final declarations and race time.

If you have already placed a bet and a withdrawal occurs, your options are limited. Some bookmakers offer early cashout on certain markets, allowing you to take a reduced return before Rule 4 is applied. This requires the bet to still be cashable, which is not always the case close to race time. Otherwise, you accept the deduction as part of the inherent variability in horse racing.

Know before you bet is a sensible approach. Checking runner status adds only seconds to the betting process but protects against frustrating post-race discoveries. When using free bets with finite value, that extra diligence pays for itself.