AUOdds

Arbitrage Betting Guide: Splitting a Bankroll Across 9 Books

By the AUOdds team · Updated 5 Nov 2026 · 7 min read

Key takeaways
  • Treat your accounts as one bankroll held in nine places, and keep a cash reserve outside them for top-ups and fixes.
  • Your smallest account balance limits the size of any lock that uses that bookmaker.
  • A total outlay of around 15% of the bankroll per lock is a sensible starting point for a A$2,000 bank.
  • Rebalance with clear triggers and a weekly review rather than reacting to every result.
  • A lock locks in a return only at the prices shown, so keep buffers for price moves, stake limits, voids and mistakes.

This arbitrage betting guide covers the part most guides skip: how to split one bankroll across 9 Australian bookmakers so both legs of a lock can be funded the moment it appears. The maths of a single lock is simple. Keeping enough money in the right accounts, week after week, is harder, and it is where many people struggle. Below you'll find a weighted split for a A$2,000 bank and a rule of thumb for sizing each lock. There is also a worked example with real-looking odds and a rebalancing routine for after results. You'll also see what your reserve is for, because prices move, stakes get limited and bets can be voided.

In this guide
  1. Why does this arbitrage betting guide start with the bankroll?
  2. How should you split A$2,000 across 9 bookmakers?
  3. What does an arbitrage betting strategy example look like with real stakes?
  4. How do you rebalance accounts after results?
  5. What should your reserve cover when a lock goes wrong?
  6. How do you track balances, limits and tax records?

Why does this arbitrage betting guide start with the bankroll?

Most guides explain how to find a lock and calculate the stakes, then stop. That's the easy part. The harder part is having money in the right two accounts when a lock appears, because you can't bet with a bookmaker you haven't funded.

A lock only exists for a short time. AUOdds data shows 3,937 locks in the last 30 days across 9 bookmakers, with a typical lock of 1.4%. The prices behind those locks are usually about 10 seconds old, and a gap you spot now may be gone a few minutes later. If you need to transfer money before placing the second leg, the price may move while you wait.

That's why the bankroll split matters as much as the maths. A good split means:

Think of the 9 accounts as one bankroll held in nine places. The total is the number you track. Individual balances matter only because each leg of a lock must come from one specific account.

Before you deposit anywhere, confirm each operator is licensed. The ACMA's page on checking whether a gambling operator is legal is the place to start. Stick to pre-match markets. Online in-play sports betting isn't offered to Australians, so every lock in this arb betting guide is placed before the start.

How should you split A$2,000 across 9 bookmakers?

Start by holding back a reserve. In this example, 10% (A$200) stays in your bank account. It has a job to do: you use it to top up a short account or fix a lock that goes wrong.

The remaining A$1,800 goes into the 9 bookmakers. An even split is A$200 each. It's simple and works well in your first few weeks. Once you've logged where your locks actually land, weight the split towards the books that appear most often.

A weighted split might look like this:

That adds up to A$2,000. Base each book's tier on your own records, not guesswork. After 50 or so locks, count how often each book appears on either leg and adjust.

Two rules keep the split workable. First, your smallest account balance limits the size of any lock that uses it. An account holding A$110 can't fund a A$150 leg.

Second, avoid putting most of the money in one book, however often it appears. If that account has its stakes limited, a large slice of your bankroll is stuck where it can't be used for locks. You'll then need to withdraw it.

Some books may rarely pair with others in the markets you follow. A small balance there is enough until your records say otherwise.

What does an arbitrage betting strategy example look like with real stakes?

Here's an arbitrage betting strategy example using the split above. A two-outcome tennis match is priced at 2.05 for Player A at Book C (Tier 1, A$260) and 2.02 for Player B at Book G (Tier 2, A$200).

Check it's a lock by adding the implied probabilities:

The margin is about 1.7% (1 ÷ 0.9828 = 1.0175). For a total outlay of A$300, the stakes are:

Here are the results at the prices shown:

Why A$300? A useful starting point is to keep each leg comfortably below the smaller account balance. Here the biggest leg is A$151 and Book G holds A$200. That leaves room if a price shifts and you need to stake a little more.

A total outlay of around 15% of the bankroll suits a A$2,000 bank. Bigger outlays tie up more money and drain accounts faster. Smaller ones earn less per lock but leave more locks fundable at once.

An AUOdds alert gives the exact stake for each outcome. Always check those stakes against your actual balances before placing either leg.

How do you rebalance accounts after results?

Every settled lock moves money from one account to another. In the example above, suppose Player A wins:

Your total bankroll rose by about A$5, but Book G can no longer fund a A$150 leg. If the next lock needs Book G, you'll either miss it or have to deposit in a hurry.

Set rebalancing triggers rather than reacting to each result. A simple version:

Here both triggers fire. Withdraw about A$156 from Book C to bring it back to A$260. Top up Book G with A$151 from your reserve so it's back at A$200. When the withdrawal lands, it refills the reserve.

Withdrawals take time to process, and each bookmaker sets its own terms. Your reserve bridges that gap. Without it, you'd have to wait for one account to pay out before you could fund another.

Keep rebalancing boring and regular. Moving money after every lock creates a lot of transactions to track. Waiting a month lets balances drift until half your accounts are too low to use. A weekly review plus the two triggers is a sensible middle ground for most people.

What should your reserve cover when a lock goes wrong?

A lock locks in a return at the prices shown. It doesn't protect you from what happens between seeing the prices and having both bets accepted. Your reserve and account buffers exist for these situations:

A useful habit is to place first the leg most likely to move or be limited. If it's accepted in full, the second leg is usually the steadier one.

Your account buffer is the gap between your typical leg and your account balance. It gives you room to cover a repriced second leg without making a deposit. Your bank reserve covers bigger fixes.

If you find yourself dipping into the reserve for fixes more than occasionally, cut your outlay per lock until your process improves.

Never chase a broken lock with a bigger stake to win it back. Take the result, log it and work out what went wrong.

How do you track balances, limits and tax records?

A spreadsheet is enough. Use one row per lock, with these columns:

Add a second tab with one row per account. Show its target, current balance and any stake limits you've noticed. Over time this shows which books earn their Tier 1 spot and which can drop to Tier 3. If a book starts limiting you, lower its target and move the money to accounts you can still use.

Keep records of deposits and withdrawals as well, because they make reconciling balances much easier. On tax, the ATO's Taxation Ruling IT 2655 sets out how it views gambling and betting winnings. Read it, and speak to a registered tax agent if you're unsure how it applies to you.

Finally, keep perspective. Arbitrage involves real money and real mistakes, and it can take up a lot of time. Only use money you can afford to lose.

Betting is for people aged 18 and over. If you want a break, BetStop, the National Self-Exclusion Register, lets you exclude yourself from all licensed Australian online and phone wagering services in one step. Gambling Help Online offers free, confidential support if gambling stops feeling like something you control.

Frequently asked questions

How many bookmakers do I need for arbitrage?

You can start with three or four licensed books, but more accounts mean more locks you can act on. Nine accounts give wide coverage, though each one needs funding and tracking. Many people start with fewer accounts and log where locks appear. They then add the bookmakers that keep showing up on one leg or the other.

Is A$2,000 enough to start?

It's workable for a 9-book split with lock outlays around A$300. A smaller bank can work with fewer books or smaller stakes. The key is that every account you use can fund one full leg plus a buffer. Start smaller if you're still learning, because early mistakes can cost more than the margin on a typical lock.

Should I split my bankroll evenly?

An even split is a sensible start because you don't yet know which books will appear in your locks. After 50 or so locks, weight it towards the books that appear most often. Cap any single account so that a stake limit there doesn't trap too much of your bankroll.

How often should I rebalance my accounts?

A weekly review works for most people, with triggers in between. Top up any account that falls below about 60% of its target, and withdraw from any account above about 160%. Fund top-ups from a bank reserve so you can act straight away, because withdrawals take time to process.

Sources

  1. Check if a gambling operator is legal, Australian Communications and Media Authority
  2. BetStop: the National Self-Exclusion Register, Australian Communications and Media Authority
  3. Taxation Ruling IT 2655: gambling and betting winnings, Australian Taxation Office

More guides

18+ only. Betting involves risk, and prices and limits can change before you place a bet. If gambling isn't fun any more, Gambling Help Online (1800 858 858) is free and confidential, and BetStop lets you exclude yourself from every licensed Australian bookmaker.