Nearly every Australian bookmaker hands out bonus bets as part of their welcome offer or ongoing promotions. Sportsbet, TAB, Ladbrokes, Neds and a long list of others regularly credit accounts with $50, $100, or more in bonus bet funds after a qualifying deposit. The catch is that bonus bets are not cash. You cannot withdraw them directly, and if your bet loses, the stake does not come back. What you get back, if you win, is only the profit portion of the return.
That distinction - stake not returned, or SNR - is what defines an Australian bonus bet and what makes a smart conversion strategy so important. Left unconverted, most people simply place their bonus bet on a random match, lose, and walk away with nothing. With the right approach, you can reliably extract 70% to 85% of the bonus bet's face value as real, withdrawable cash every single time. Across dozens of offers per month, that adds up to thousands of dollars.
This guide explains exactly how to do it, step by step. And if you want the maths done for you automatically, DegenToPro's bonus bet finder calculates the optimal conversion odds and cover stake for every offer on the calendar.
What bonus bets actually are (SNR explained)
In Australia, the overwhelming majority of promotional bets are issued as "stake not returned" or SNR bonus bets. This is different from what some offshore platforms call a "free bet with stake returned" (FBSR). Understanding the difference is fundamental to knowing what your bonus bet is actually worth.
With an SNR bonus bet, if you place a $100 bonus bet at odds of $3.00 and you win, you receive $200 in total return - but $100 of that is treated as the returned stake, which in this case is the bonus bet amount and is not yours to keep. So you net $200 total minus the $100 stake that is the bonus bet = $100 in profit. That $100 is real cash.
If you lose, the bonus bet is simply gone. You do not lose any of your own money on the bonus bet itself, but you also receive nothing back. The bonus bet stake is consumed either way.
So the effective value of a $100 SNR bonus bet at odds of $3.00 is just the $200 profit portion: $100. But that only holds if your selection wins. The conversion strategy is designed to lock in a portion of that profit regardless of the result - so you extract cash value from the bonus bet with near certainty rather than gambling it away.
Some promotions do issue "stake returned" bonus bets, but these are relatively rare in Australia. If you are unsure which type a bookmaker has issued, read the terms carefully or check the DegenToPro promo calendar, which flags bonus bet types for every current offer across 100+ Australian bookmakers.
The conversion concept: why odds matter
Here is the core insight that makes bonus bet conversion work: because only the profit comes back (not the stake), the higher the odds you back, the larger the profit relative to the stake, and the more of the bonus bet's face value you can retain after covering the other outcomes.
Think of it this way. If you place a $100 SNR bonus bet at $1.50 (short odds), and your selection wins, you receive $50 in profit. Your net gain is $50. But you used a $100 bonus bet to generate only $50 in profit. That is a 50% retention rate - you kept half the value.
Now place that same $100 SNR bonus bet at $5.00. If it wins, the profit is $400. Your net gain is $400. That is a 400% retention rate on the bonus bet - but the problem is that $5.00 winners only come in 20% of the time (in a fair market). Without covering the other outcomes, you are gambling.
The solution is to back the high-odds selection with your bonus bet and cover all other outcomes with your own cash at another bookmaker or exchange - specifically, by placing a lay bet on Betfair or a covering back bet elsewhere. When you cover correctly, you guarantee a profit whether your selection wins or loses. That guaranteed profit is your conversion rate: the percentage of the bonus bet's face value you reliably extract as real cash.
The optimal odds range to maximise conversion - balancing the higher profit from longer prices against the cost of the cover stake - sits roughly between $4.00 and $7.00. DegenToPro's bonus bet finder calculates the exact optimal odds and cover stake for your specific bonus bet amount in real time.
Retention rate maths
The retention rate tells you how many cents of real cash you extract for every dollar of bonus bet. A retention rate of 75% means a $100 bonus bet converts to $75 in withdrawable cash. Here is how to calculate it manually.
For an SNR bonus bet, the formula for retention rate when using a lay bet on Betfair to cover is:
Retention rate = (Back odds - 1) / Back odds x (1 - Betfair commission) x 100
This simplifies in practice to approximately: (1 - 1/Back odds) x (1 - commission)
For a $100 bonus bet at back odds of $5.00 with Betfair's standard 5% commission:
- Profit if your selection wins = $400 (that is $500 minus the $100 SNR stake)
- Lay stake needed to cover = $100 x (1/5.00) = $20 at $5.00 lay odds
- If the selection wins: you net $400 profit (bonus bet) minus the lay liability, which at $5.00 lay odds on a $20 lay stake is $20 x (5.00 - 1) = $80. Net = $400 - $80 = $320. But wait - you also receive your $20 lay stake back. So net profit = $400 (back win) - $80 (lay loss) = $320.
- If the selection loses: the bonus bet is lost (no cost to you), and you win the lay bet: $20 x (1 - 0.05 commission) = $19. Net profit = $19.
The asymmetry here is significant: winning scenarios net far more than losing scenarios. This is why choosing the right odds matters so much - longer prices increase the win-scenario profit while the cover cost stays manageable. The table below shows how retention rate varies with back odds, assuming Betfair 5% commission and an optimal lay stake.
| Back Odds | Approx. Retention Rate | Cash from $100 Bonus Bet | Notes |
|---|---|---|---|
| $2.00 | ~47% | ~$47 | Too short - low profit margin |
| $3.00 | ~63% | ~$63 | Below optimal range |
| $4.00 | ~71% | ~$71 | Entering optimal range |
| $5.00 | ~76% | ~$76 | Strong conversion point |
| $6.00 | ~79% | ~$79 | Near-peak retention |
| $8.00 | ~82% | ~$82 | Good if liquidity allows |
| $10.00 | ~84% | ~$84 | Diminishing gains, liquidity risk |
| $15.00+ | ~87%+ | ~$87+ | Lay liquidity often unavailable at size |
The sweet spot for most Australian bonus bet conversions is $4.00 to $8.00. Above $10.00, retention rate continues to improve but Betfair lay liquidity at those prices becomes unreliable for larger stakes, and the variance increases if you are not covering perfectly. Below $4.00, you are leaving significant value on the table for no practical reason.
The back-and-cover method
The back-and-cover method is the standard approach for converting bonus bets to cash in Australia. It works as follows:
- Choose a market with good Betfair liquidity. NRL, AFL, EPL, and NBL head-to-head markets are reliable. Avoid niche markets where lay liquidity is thin.
- Find a selection priced between $4.00 and $8.00 at the bookmaker where your bonus bet is held. This is your back bet.
- Check the corresponding Betfair lay odds. Ideally, lay odds should be close to the back odds - a large spread between back and lay prices increases your conversion cost. Differences of 0.10 to 0.20 are normal; 0.50+ will noticeably hurt your retention rate.
- Calculate your lay stake. The formula is: Lay stake = (Bonus bet amount x Back odds) / Lay odds. This ensures that if your selection wins, the profit from the bonus bet covers the lay liability precisely.
- Place the bonus bet back at the bookmaker.
- Immediately place the lay bet on Betfair for the calculated lay stake. Do not wait. If the price moves between placing your back and lay bets, your conversion rate changes.
- Settle and withdraw. Whether your selection wins or loses, you have extracted a guaranteed cash amount from the bonus bet. Both scenarios result in a profit - though the win scenario profits significantly more than the lose scenario.
This is the core method. It is also available in a variation using two bookmakers instead of Betfair - backing one outcome with your bonus bet at one book and backing the other outcome with your own cash at a second book offering the opposite side at a price that guarantees profit. This is sometimes preferable when Betfair liquidity is unavailable, though it requires finding a back-back opportunity rather than a back-lay, which is more situational. DegenToPro's bonus bet finder identifies both types and shows you which produces the better conversion in real time.
Stop guessing. Let DegenToPro find the optimal conversion.
DegenToPro's bonus bet finder scans 100+ Australian bookmakers and calculates the exact back odds, lay stake, and retention rate for every bonus bet you hold. Start on the free tier - no card required.
Start Free →Worked example with real numbers
Let us walk through a complete conversion from start to finish using a realistic Australian bonus bet offer.
Scenario: You have a $100 SNR bonus bet credited to your Sportsbet account after meeting a qualifying deposit requirement. You want to convert it to cash.
Step 1 - Find the market. You identify an AFL match: Collingwood vs Richmond, head-to-head. Sportsbet has Collingwood at $4.50. Betfair has Collingwood available to lay at $4.60.
Step 2 - Calculate the lay stake.
Lay stake = ($100 x $4.50) / $4.60 = $450 / $4.60 = $97.83
Round to $97.85 for simplicity.
Step 3 - Scenario outcomes.
| Outcome | Bonus Bet Return | Lay Bet Result | Betfair Commission (5%) | Net Cash Profit |
|---|---|---|---|---|
| Collingwood wins | +$350 profit (SNR: $100 stake not returned, total return $450, net profit $350) | -$273.99 lay liability ($97.85 x (4.60 - 1) = $352.26 liability, minus $97.85 stake back = -$254.41) | n/a (lay loss, no commission) | ~$95.59 |
| Richmond wins (Collingwood loses) | $0 (bonus bet lost, no cost to you) | +$97.85 x 0.95 (5% commission on winnings) = +$92.96 | -$4.89 | ~$92.96 |
Let us recalculate the win scenario more carefully. If Collingwood wins:
- Bonus bet profit: $100 x ($4.50 - 1) = $350 (SNR, so only profit is retained)
- Lay liability: $97.85 x ($4.60 - 1) = $97.85 x 3.60 = $352.26. You lose this on the lay bet.
- Net: $350.00 - $352.26 = -$2.26... which seems negative. This shows why the back-to-lay odds spread matters. At a 0.10 spread ($4.50 back / $4.60 lay), you lose slightly when the selection wins. The conversion profit comes primarily from the lose scenario.
To fix this, recalculate with the correct lay stake targeting equal profit across both outcomes. The correct formula for equalised conversion is:
Lay stake = Bonus bet amount x (Back odds - 1) / (Lay odds - commission)
= $100 x 3.50 / (4.60 x 0.95) = $350 / 4.37 = $80.09
| Outcome | Back Bet (Bonus) | Lay Bet (Own Cash) | Net Cash Profit | Retention Rate |
|---|---|---|---|---|
| Collingwood wins | +$350 profit | -$80.09 x (4.60 - 1) = -$288.32 liability (offset by $80.09 stake return = -$208.23 net lay loss) | $350 - $288.32 = ~$61.68 | ~62% |
| Richmond wins | $0 (bonus bet lost) | +$80.09 x 0.95 = +$76.09 | ~$76.09 | ~76% |
This illustrates the key point: with SNR bonus bets, you cannot perfectly equalise outcomes the same way you can with cash bets. The profit is inherently asymmetric - you make more if the selection loses. This is why serious matched bettors use a dedicated calculator rather than manual maths. DegenToPro's bonus bet finder runs these calculations instantly for any odds combination, factoring in the back-lay spread and commission to show your exact expected cash return before you place a single bet.
Choosing the right odds
The single biggest lever you control in bonus bet conversion is the odds you back at. Here is how to make that decision well.
Target the $4.00 to $7.00 range
As the retention rate table earlier shows, prices in this range consistently produce 71% to 80% retention rates. Below $4.00 you are giving up conversion value for no benefit. Above $7.00 you can push retention above 80%, but you need to verify Betfair lay liquidity is available at your required stake before placing the back bet.
Check the back-lay spread before committing
A wide spread between the bookmaker's back price and Betfair's lay price eats directly into your retention rate. Spreads of 0.10 to 0.20 are normal and acceptable. If you see a spread of 0.50 or more, look for a different market. Common sports with tight Betfair spreads in Australia include AFL, NRL, EPL, and major tennis.
Check Betfair lay liquidity at your stake size
Before placing your back bet, confirm that Betfair has enough liquidity available to match your lay stake. If you need to lay $150 but only $80 is available at your target price, you may have to lay at a worse price, which reduces your conversion. For larger bonus bets ($200+), check liquidity first. DegenToPro's bonus bet finder surfaces markets with sufficient liquidity for your specific bonus bet amount automatically.
Avoid same-game multis and exotic markets
Bookmakers often try to restrict bonus bet use to multis, specific markets, or minimum odds requirements. Always read the bonus bet terms. Where bonus bets can be used on head-to-head singles, that is almost always the better conversion play compared to multis, where the compounding of probabilities reduces your edge dramatically.
Act quickly once you have found your market
Odds move. The calculation you ran five minutes ago may not hold when you return to place the lay bet. Identify your market, run the calculation, and place both legs as quickly as possible. The back bet first (to lock in the bonus bet use), then the lay bet immediately after.
Common mistakes that destroy conversion value
These are the errors that cost Australian matched bettors real money when converting bonus bets.
Backing at short odds
The most common mistake. New matched bettors often back a "safe" short-priced favourite with their bonus bet, not realising that shorter odds dramatically reduce the profit from the win scenario and therefore crater the retention rate. A $100 bonus bet placed at $1.80 yields only $80 profit if it wins, which means your theoretical maximum conversion - even before covering - is 80%. After covering, you will net far less. Always target longer prices in the $4.00 to $7.00 window.
Forgetting Betfair commission
Betfair charges a standard 5% commission on net winnings on each market. Ignoring this in your calculation means you will receive less from the lay win scenario than you expected. Always factor commission into your lay stake calculation. DegenToPro includes commission in every calculation automatically.
Not placing both legs immediately
Placing the back bet and then walking away to place the lay bet an hour later is a significant risk. Odds move constantly. If the lay price increases substantially between your two legs, your conversion rate drops. If you cannot place both legs quickly, wait for a better opportunity rather than taking on unnecessary risk.
Using bonus bets on multis unnecessarily
While some bonus bet terms require multis, many do not. Where you have a choice, single head-to-head markets almost always produce better conversions than multis. Multi legs compound the probability of the bonus bet losing, which increases your cover cost and reduces your net return.
Ignoring the back-lay spread
A wide back-lay spread is a silent drain on your conversion. Always compare the bookmaker's back price with the Betfair lay price before committing. Moving to a different market or sport with a tighter spread can add several percentage points to your retention rate on each conversion.
Not tracking your conversions
Without records, you have no idea whether you are converting at 60%, 75%, or 82%. Tracking each conversion in a bet tracker lets you identify where you are losing value - whether it is wide spreads, late lay placement, or commission miscalculations - and fix it. DegenToPro's bet tracker logs every conversion with verified CLV so your performance data is always accurate.
How DegenToPro automates optimal conversion
DegenToPro is Australian-built software designed specifically for the Australian matched betting and EV betting market. The bonus bet finder is one of the core tools, and it removes every manual step from the conversion process.
- Scans 100+ Australian bookmakers for current bonus bet offers in real time
- Calculates the optimal back odds range for each bonus bet amount
- Identifies the best available market and lay odds on Betfair at your required stake
- Calculates the exact lay stake, factoring in Betfair commission and the back-lay spread
- Displays your expected cash return and retention rate before you place a single bet
- Pushes completed conversions to the bet tracker with one click for CLV verification
Beyond the bonus bet finder, DegenToPro gives you access to a full suite of Australian betting tools: a 7-day promo calendar that shows every upcoming bonus bet offer across the bookmaker landscape, a deposit offers tracker so you never miss a qualifying opportunity, an arbitrage finder scanning 100+ books in real time, a +EV finder for positive expected value singles, and racing software covering Australian thoroughbred and greyhound markets.
All of these tools feed into a single bet tracker that logs your bets, verifies your closing line value (CLV), and displays your running profit. The community behind the platform - more than 6,000 members in the DegenToPro Discord - shares live conversions, tips, and results daily, making it easy to learn from experienced matched bettors who have already solved the conversion puzzle.
Pricing is in Australian dollars. A FREE tier is available with no card required, so you can explore the tools before committing. Paid plans run Weekly at $59.99 AUD, Monthly at $199.99 AUD, or Lifetime access at $699.99 AUD. A World Cup Offer of 20% off is currently live - check the pricing page to lock in the discount before it expires.
For Australians who take matched betting seriously, having a tool that calculates optimal conversions automatically rather than relying on manual maths and spreadsheets is not a luxury. It is the difference between converting at 65% and converting at 80%+ consistently. Across a month of offers from Sportsbet, TAB, Ladbrokes, Neds, and the rest of the Australian bookmaker landscape, that gap is hundreds of dollars.
The bottom line
Converting bonus bets to cash in Australia is a learnable, repeatable process. The core principle is simple: SNR bonus bets only return profit, not stake, so you back at high enough odds to generate meaningful profit if your selection wins, then cover the other outcomes with your own cash to lock in a guaranteed return regardless of the result. The optimal odds range for most conversions is $4.00 to $7.00, which produces retention rates of 71% to 80% before accounting for the back-lay spread.
The retention rate maths, lay stake formula, and market selection rules are all manageable once you understand them. The mistakes that cost people money - backing at short odds, ignoring Betfair commission, letting the back-lay spread blow out, and placing legs at different times - are all avoidable with the right habits and tools.
Manual conversion is viable if you are working through one or two offers per week. But Australian bookmakers post new bonus bet offers continuously across Sportsbet, TAB, Ladbrokes, Neds, and dozens of other platforms. At volume, manual calculation and market hunting become the bottleneck that limits your monthly return. DegenToPro's bonus bet finder eliminates that bottleneck: it calculates the optimal conversion for every offer automatically, surfaces the best available markets and lay prices, and logs everything in your bet tracker for verified performance records.
If you are sitting on bonus bets right now and have not converted them yet, the free tier is available with no card required. Start there, run your first conversion with the finder's guidance, and see what your bonus bets are actually worth.
Convert your bonus bets to cash with DegenToPro
Join 6,000+ Australian matched bettors using DegenToPro's bonus bet finder to calculate optimal conversions, find the best markets, and track verified profit across 100+ bookmakers. The free tier is live right now - no card required.
Start Free →