Free Tool
Rule 4 Deduction Calculator
When a horse is withdrawn after you've backed a runner in the same race, a Rule 4 deduction is taken from your winnings - not your stake - based on the withdrawn horse's odds at the time it came out.
Deduction only applies if your bet wins - it's taken off your winnings, not your original stake.
Based on the standard Tattersalls Rule 4(c) deduction scale used across UK bookmakers. Rates can occasionally vary slightly by operator - check their terms if the amount matters. Not betting advice. 18+ BeGambleAware.org
How to use this calculator
- Enter the odds you actually got on your selection, and your stake.
- Enter the withdrawn horse's odds at the time it was pulled out - not your own selection's odds.
- The deduction rate, amount, and your adjusted total return update instantly.
What Rule 4 is
Rule 4 is a standard deduction UK and Irish bookmakers apply to winning bets when a horse is withdrawn from the race after you've placed your bet. It only applies if your bet wins or places - if your selection loses anyway, Rule 4 is irrelevant. For the full explanation of why it exists and the complete deduction scale, see our Rule 4 explainer.