What is acca insurance?
Acca insurance — Acca insurance is a bookmaker promotion that refunds your stake on a losing accumulator if exactly one leg lets you down.
Acca insurance is a UK bookmaker promotion that refunds your stake on a losing accumulator if exactly one leg lets you down — typically credited as a free bet up to a stated cap (£20 or £25 is the usual ceiling). Bet365's Soccer Acca Insurance, Sky Bet's Acca Edge, and Paddy Power's standing acca-insurance offer are the canonical UK examples; a handful of operators extend the structure to outright accumulators around major tournaments.
Acca insurance is one of the highest-frequency reload structures in the UK market. Bet365 runs it every weekend on 5+ leg football accumulators; Sky Bet's Acca Edge carries the equivalent shape; Paddy Power's offer sits in the same Saturday window. Combined with sequential laying through an exchange, acca insurance typically extracts £4–£12 of EV per qualifying acca with moderate variance, and members who build the offer into their weekly rhythm often run two or three a week per active account. The mechanic relies on an asymmetric refund: the bookmaker pays the full acca return when all legs win, and refunds the stake when exactly one leg loses, while the exchange's lay structure costs the bettor only on the symmetric outcomes — leaving the "exactly-one-leg-fails" branch as the source of long-run EV.
The full acca-insurance workflow including per-leg lay sizing is in our accumulators guide; the laying-accas mechanics specifically are in our acca laying guide; the sequential-laying technique that drives the EV is in our sequential laying guide. Acca insurance is one of the most reliable components of the wider reload-offer pipeline at the major UK operators.
Worked example
A £20 5-fold acca on Bet365 (acca insurance up to £25). Pick five Premier League match-result selections at average odds of around 2.0 per leg → cumulative odds 32.0, potential return £640 if all five legs win. The promotion's term: if exactly four legs win and one loses, Bet365 refund the £20 stake as a free bet.
Lay each leg sequentially as it kicks off — at Smarkets, lay the first match before its 12:30 kickoff, then re-evaluate after settlement and lay the second before its 15:00 kickoff, and so on. If all five legs win, the bookmaker pays the £640 and the exchange has paid out the lay liabilities; the net result depends on the odds chosen but typically lands within a few pounds of the back stake. If exactly one leg loses, the bookmaker refunds £20 as a free bet, which a matched bettor extracts to roughly £14 cash via a single back-lay pairing. Across many acca-insurance plays the long-run EV from the asymmetric refund averages £4–£12 per acca.
Common mistake
Laying the entire acca up front as if it were a single straight bet. The accumulator's lay liability would be enormous — the cumulative 32.0 odds in the example above mean a £20 acca would require around £620 of liability at the exchange to lay perfectly, which most members can't fund and which would tie up capital for the full duration of the day. Sequential laying — laying leg by leg as each match kicks off — is the only practical route to extracting acca-insurance EV. The other trap is choosing legs at odds the exchange can't lay for liquidity reasons: thin in-play markets on lower-league football or obscure tennis matches will mean the lay bet goes unmatched at the price you need, leaving the position partially uncovered when the leg settles.