Betfair Cash Out closes an open bet by automatically placing the opposite bet at current prices, locking the same return whoever wins. On the Exchange it submits a real lay or back order against the live order book; the displayed figure already has a small spread (about 1–3%) baked in, which is the price you pay for one-click convenience versus a manual green-up.
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This is a sub-article in our Betfair Cash Out guide pillar. The pillar covers when and why to cash out across different sports; this page is the engine-room view — what the button is doing in the order book the instant you press it, and why the number it shows you is never quite the number a sharp trader would have got doing the hedge by hand. If you grasp the mechanic, you stop treating Cash Out as magic and start treating it as one tool among several.
What Cash Out actually does
Cash Out places the opposite bet to your open position so the result no longer matters. If you backed a selection, Cash Out lays it; if you laid one, Cash Out backs it. The size of that opposite bet is calculated to leave you with the same net profit or loss across every outcome — a flat, locked figure. That is the entire idea: it converts an open, swinging position into a fixed result you can take right now.
Experienced exchange traders have done this manually for years — it is called hedging, or "greening up" when you are in profit. Cash Out is simply Betfair automating the calculation and firing the order for you. The value it adds is speed and simplicity; the cost it adds is the spread it takes for the favour. Everything else on this page flows from that single trade-off. If the words back, lay and green-up are not yet second nature, our green-up explained page is the place to start before this one.
The lay calculation behind the figure
The figure you see is the result of a standard hedging formula. Say you backed a selection for a stake S at odds B, and the current price to lay it is L. To lock an equal profit on both sides, Betfair lays a stake of (S × B) / L. The locked profit before commission is then your potential back winnings minus the lay liability, spread evenly across outcomes.
Concretely: you backed £50 at 4.0, and the selection is now trading at 2.5 to lay. The lay stake is (50 × 4.0) / 2.5 = £80. Lay £80 at 2.5 and whatever happens you are left with roughly £30 before commission — the same figure win or lose. That £30 is what Cash Out would offer you, minus its spread. The trading calculator does this arithmetic for you, and the dedicated cash-out calculator walkthrough shows the numbers step by step if you want to check Betfair's figure against your own.
Where the hidden spread comes from
The Cash Out figure is always slightly worse than the raw hedge because Betfair takes a margin off the prices it uses. Instead of offering you the exact best lay price in the book, it shades the calculation a fraction in its own favour — typically 1–3% of the locked profit on the Exchange. Two things justify it from Betfair's side: execution risk (the price could move between display and fill) and the convenience of doing the maths and the order for you. From your side, it is a small, recurring tax on laziness.
That tax is exactly why most active traders green up manually rather than press Cash Out. A manual green-up lets you place a limit order at the price you choose and queue it, often getting matched at a better price than Cash Out's shaded one, and keeping the spread for yourself. Over one bet the difference is pennies; over a thousand bets it is the gap between a system that nets out and one that bleeds. The full side-by-side is in cash out vs green up, and the underlying skill of hedging at a price you pick is covered in hedging on Betfair.
Exchange vs Sportsbook cash out
Cash Out behaves very differently on the Exchange versus the Sportsbook, and the difference matters for how much you lose to the spread. On the Exchange, your Cash Out is a real order matched against the live order book at market prices — there is genuine liquidity behind it, the spread is tight in busy markets, and you can verify the maths yourself. On the Sportsbook, there is no order book; Betfair calculates the figure entirely in-house using its own model, so the margin is wider and far less transparent.
The practical takeaway: if you care about getting the best value from cashing out, do it on the Exchange where the figure is anchored to real prices, not on the Sportsbook where it is whatever Betfair decides. For the broader distinction between the two products — commission, liquidity, how prices are set — see Sportsbook vs Exchange: when to use each. Exchange liquidity is what makes a clean cash out possible at all, which our liquidity explained piece unpacks.
The position: I had laid the draw for £100 at 3.6 before kick-off in a mid-table Premier League match — liability £260 if it finished level, profit £100 if either side won.
The move: the home side scored on 28 minutes. With a goal in it, the draw price drifted out to 4.8 in the match-odds market — my lay was now well in profit because the draw had become less likely.
What Cash Out offered: the button showed £28.40 to close the whole position. I checked it against the manual hedge: backing the draw for (100 × 3.6) / 4.8 = £75 at 4.8 locks about £29.20 before commission. So Cash Out was shading roughly 80p — its spread — off the true figure.
What I did: I greened up manually instead, queuing a back of £75 at 4.8. It matched, locking £29.20 across all outcomes (about £27.74 after 5% commission). The 80p I kept versus the button is trivial on one trade — but that is the exact leak that, repeated all season, separates traders who study the mechanics from those who just tap Cash Out and never ask what it cost them.
Cash Out locks a result; it does not protect you from a bad entry, and the figure can swing violently in-play. A single goal can move your Cash Out value 30–40% in seconds, in either direction. Never treat the displayed number as guaranteed — it updates live and your fill can slip. Most Betfair traders lose money overall; cashing out a losing position simply crystallises the loss. Only ever stake what you can afford to lose.
Why the figure slips between click and fill
The Cash Out number you click is a snapshot, not a promise. It refreshes every one to two seconds against live prices, and your order then has to actually match in the order book. In a fast in-play market — the seconds around a goal, a break of serve, a photo finish — the price can move in the fraction of a second between your click and the fill, so the locked figure comes out a little different from the one you saw. This is normal market behaviour, not a glitch.
How much it slips depends almost entirely on liquidity. In a deep, heavily-traded market the best prices have thousands of pounds queued at them, so your order fills at essentially the displayed price. In a thin market — a minor race, an obscure tennis match — there may be little money at the top of the book, so your Cash Out eats into worse prices and the slippage is real. The same in-play bet delay that affects every order applies here too. If you trade markets where this matters, read why prices move to understand what you are clicking into.
Partial cash out and multiple bets
Cash Out is not all-or-nothing. Where the market supports it, partial Cash Out closes a chosen fraction of your stake and lets the rest run — you bank some certain profit while keeping upside if the position keeps moving your way. The mechanic is identical to a full cash out; Betfair just sizes the opposite bet to the portion you select. It is a genuinely useful middle ground, covered in depth in partial cash out strategy.
Cash Out also aggregates across multiple bets on the same market. If you have backed a selection twice at different prices, "Cash Out" closes both at once and shows the combined P&L, while "Cash Out All" sweeps every open position across your bets. Handy for tidying up a messy book in one click — but the same spread applies to the whole lot, so for anything you care about, a manual green-up per position still keeps more in your pocket.
Three myths about Cash Out worth killing
Most of the confusion around the button comes from three persistent myths, and clearing them up changes how you use it. Myth one: Cash Out guarantees your profit. It guarantees a result, not a profit — if your position is underwater, cashing out simply locks the loss. The button is just as happy crystallising a −£40 as a +£40; it has no opinion on whether you should.
Myth two: the Cash Out figure is the "fair" value. It is the fair value minus Betfair's spread, which is not the same thing. The genuinely fair number is the manual hedge price you can see in the order book yourself. Treating the button's figure as gospel means you never notice the small, steady toll it takes. Myth three: cashing out reduces risk. It removes the open position's variance, yes — but it does not undo a bad bet, and reflexively cashing out every position the moment it ticks green is a well-known way to clip your winners short while letting losers run to the line. The discipline of when to close is a strategy question, covered in when to cash out, not a mechanic the button solves for you.
Hold those three corrections in mind and the button stops being a comfort blanket and becomes what it actually is: a fast, slightly expensive way to execute a hedge you could place yourself. That framing — tool, not talisman — is the whole point of understanding the mechanics.
My verdict: when to use the button
After years on the exchange, my honest position is that Cash Out is a convenience tool, not a trader's tool. Use it when speed and simplicity genuinely outweigh the spread: you are away from your ladder, you are new and not yet confident hedging manually, or the market is liquid enough that the spread is negligible and you just want out now. In those cases the small cost is fair payment for not fumbling a manual hedge.
But if you trade seriously, learn to green up by hand on a ladder in Bet Angel or Geeks Toy. You choose your exit price, you keep the spread, and you understand exactly what your position is — none of which the button gives you. Cash Out is the training wheels; the manual hedge is the bike. Start with the cash out pillar for the strategic picture, decide when cashing out is actually the right call, and graduate to manual green-up when you are ready. The button will always be there; the skill is the thing worth building.
Cash Out is automated hedging with a small spread attached. Learn the lay maths underneath it and you will know exactly what every click costs you.
Trading Calculator Open Betfair Account →FAQ
How does Betfair Cash Out actually work? It places the opposite bet to your open position at current prices, neutralising it so you take the same profit or loss whoever wins. On the Exchange it submits a real lay (or back) order against the live order book; on the Sportsbook it is calculated internally. Either way it is an automated hedge.
Why is the Cash Out figure lower than my potential profit? Because it crosses the spread and Betfair builds in a small margin (roughly 1–3% on the Exchange, more on the Sportsbook). You are paying for the convenience and for locking in now. Doing the same hedge manually with a limit order usually keeps a few of those ticks for yourself.
Why does the Cash Out value I clicked differ from what I got? The figure updates every 1–2 seconds and your order fills against live prices. In a fast in-play market the price can move between click and match, so the actual locked figure slips. In deep markets the slippage is tiny; in thin markets it can be material.
Is manual green-up better than Cash Out? For Exchange traders, usually yes. A manual green-up lets you choose your exit price and queue a limit order, keeping the spread Betfair would otherwise take. Cash Out is faster and simpler, which is its value, but you pay for that in the figure.
Can I cash out only part of my bet? Yes, where the market offers it. Partial Cash Out closes a chosen portion of your stake and lets the rest run, so you bank some profit while keeping upside. The underlying mechanic is identical — it just sizes the opposite bet to the fraction you select.