Acca insurance explained: what the refund is worth
Acca insurance refunds your stake as a free bet when one leg loses. How it works, what the refund is really worth, and a worked five-fold with the maths.
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Acca insurance is a bookmaker offer that gives you your stake back if exactly one leg of an accumulator lets you down. In most versions the refund is a free bet, not cash, and it only applies to bigger accas: BoyleSports, for example, needs five or more selections, each at 1.20 or longer, and returns the stake as a free bet, up to 20 pounds or euros, if exactly one loses. It is worth something. It is worth a lot less than the headline suggests, and it does not turn a bad accumulator into a good one. The legs still have to be good bets on their own: BAI8's match predictions give a researched chance for each match result, which is the number to check a leg's price against.
How acca insurance works
The terms vary by bookmaker, but the shape is the same:
- A minimum number of legs. Five is common. BoyleSports applies it to five-folds or bigger.
- A minimum price per leg. BoyleSports uses 1.20 (1/5), so you cannot pad the acca with near-certainties.
- Exactly one loser. Two losing legs and you get nothing back.
- A free bet, capped. The refund usually comes as a free bet up to a maximum amount, credited after the acca settles. BoyleSports caps it at 20 pounds or euros per bet and credits it within 15 minutes of settlement.
- Void legs do not count. BoyleSports says voided selections do not count toward the qualifying number of legs, so a five-fold with one void becomes a four-fold and loses its insurance.
Some bookmakers let you choose between insurance and a boost on the same bet. BoyleSports offers one or the other per accumulator, never both. For how boosts are worth less than they look, see price boosts explained.
Why a free bet is not cash
A free bet returns its winnings but not its stake. Put a 10 euro free bet on a selection at 4.00 and win, and you collect 30 euros, not 40. Lose and you lose nothing of your own, but you get nothing either.
So the value of a free bet depends on where you use it. If you place it on a selection at 4.00 that really has a 25% chance, you collect 30 euros a quarter of the time: 0.25 × 30 = 7.50 euros on average. A 10 euro free bet is worth about 7.50 euros, and less if the price you use it on is worse than the true chance. The longer the price, the closer a fairly priced free bet gets to its face value, but the more often it returns nothing.
A worked five-fold
The numbers here are made up to show the maths, not a quote or a BAI8 call. Five football legs, each at 1.55, and each one with a true chance of 60%. That 1.55 implies 64.5%, so each leg is already a slightly bad bet, which is normal: it is the bookmaker's margin. Stake: 10 euros, under the 20 euro cap, so the whole stake would come back. The free bet is valued at 7.50 euros, as worked out above.
| Chance | Pays | Expected value | |
|---|---|---|---|
| All five win | 0.6⁵ = 7.8% | 1.55⁵ = 8.95, so 89.47 euros | 6.96 euros |
| Exactly one loses | 5 × 0.4 × 0.6⁴ = 25.9% | Free bet worth about 7.50 euros | 1.94 euros |
| Two or more lose | 66.3% | Nothing | 0 |
| Total | 8.90 euros |
Without insurance the acca returns 6.96 euros on average for every 10 staked: an expected loss of about 30%. That is what five small margins do when you multiply them, as accumulator odds explained shows.
With insurance it returns 8.90 euros: an expected loss of about 11%. The offer is worth roughly 1.94 euros on a 10 euro acca, which is real money. It still leaves you with a bet that loses about a ninth of its stake on average.
When it actually helps
Insurance pays out most when "exactly one loses" is likely. That happens when each leg is fairly likely but not certain, and when there are five or six legs rather than ten. With ten legs at 60%, it is much more likely that two or more lose, so the insurance pays out less often.
It also helps more when each leg is closer to fair. If your own estimate for each leg beats the bookmaker's price, the acca might already be a good bet and the insurance is a bonus on top. If every leg is a bad price, insurance only softens the damage.
How to treat it
- Price each leg on its own first. If you would not back a leg as a single, insurance is not a reason to add it.
- Count the free bet at about three quarters of its face value, not the full amount.
- Read the void rule. A postponed match can quietly remove your insurance.
- Stake the acca as what it is: a long-odds bet that usually loses. How much a long-odds bet should get is in staking without going broke.
What this does not tell you
Terms differ between bookmakers and change often; check the current rules before you bet. The worked example uses made-up chances, and the value of a free bet depends on where you use it. BAI8 prices single match results, not accumulators, so there is no number for an acca as a whole; to check each leg, open the match predictions. The Free plan covers 5 assessments a month, no card needed.
Keep your record and your bankroll in one place
Record every bet with its stake, odds and result, and watch your profit, your return and your total stake move as each one settles.
Free plan: 5 assessments a month. No card.
Common questions
What is acca insurance?
A bookmaker offer on accumulators: if exactly one selection loses, you get your stake back, usually as a free bet rather than cash. BoyleSports, for example, applies it to five-fold accas or bigger with every leg at 1/5 (1.20) or longer, and caps the refund at 20 pounds or euros.
Is acca insurance a refund in cash?
Usually not. Most versions return a free bet, and a free bet returns only its winnings, not its stake, so it is worth less than the same amount in cash.
How much is a free bet worth?
Less than its face value. A 10 euro free bet placed on a selection at 4.00 that really has a 25% chance is worth about 7.50 euros on average, because you keep only the 30 euros of winnings a quarter of the time.
Does acca insurance make an accumulator a good bet?
Not on its own. In our worked example it cuts the expected loss on a five-fold from about 30% of the stake to about 11%. It makes a bad acca less bad; it does not make it good.
What happens if a leg in an insured acca is void?
It drops out and the acca settles on the remaining legs. At BoyleSports a voided selection does not count toward the five legs needed to qualify, so the insurance can fall away.