What Is a Limit Order? Crypto Guide for Australians (2026)

What is a limit order?

A limit order tells an exchange to trade an asset only at a specific price (the "limit price") or a better one. It is one of the basic order types on share markets and on centralised crypto exchanges that run an order book.

• A buy limit order is placed at or below the price you are willing to pay. It fills only if a seller will accept your price or less.
• A sell limit order is placed at or above the price you are willing to accept. It fills only if a buyer will pay your price or more.

"Or better" matters. If you place a buy limit at A$2.00 and sellers are offering at A$1.98, you pay A$1.98, not A$2.00. The limit is a ceiling for buyers and a floor for sellers, not a fixed price.

How does a limit order work?

On an order-book exchange, every open buy order (a bid) and sell order (an ask) sits in a live list sorted by price. The gap between the highest bid and the lowest ask is the spread. Our crypto exchange guide explains how order-book trading differs from an instant-buy screen.

1. You set the details. Choose the pair (for example BTC/AUD), buy or sell, quantity, limit price and how long the order should stay open.
2. It matches straight away or waits. If your price can already be met (a buy limit at or above the lowest ask), it fills immediately against existing orders, up to your limit. If not, it joins the order book and waits.
3. It fills in queue order. Many exchanges match orders by price first and then by time, so earlier orders at the same price usually fill first. The market can touch your price and your order can still miss out if there was not enough volume to reach it.
4. It can fill in pieces. A partial fill happens when only some of your quantity trades. The rest stays open until it fills, expires or you cancel it.

Many exchanges also charge different fees depending on how an order trades. An order that rests on the book adds liquidity and is usually treated as a "maker" order; one that matches immediately removes liquidity and is usually a "taker" order. Fee levels vary, so check your exchange's fee page.

Limit order vs market order

• Market order: buys or sells immediately at the best prices available. You get speed and near-certain execution, but not a guaranteed price. A large market order can work through several price levels, which is how slippage happens.
• Limit order: waits for your price. You get price control and protection from slippage beyond your limit, but you give up certainty that the order will fill.

As a rough rule of thumb, market orders suit small trades in very liquid pairs where speed matters more than a few cents. Limit orders suit larger orders, smaller coins with thinner order books, and anyone who has a specific price in mind. Our crypto trading basics guide covers both alongside charts and risk management.

Limit orders vs stop and stop-limit orders

• Stop order (stop-loss): sits inactive until the price reaches a trigger (the stop price), then becomes a market order. It is designed to get you out, but in a fast drop it can fill well below the stop price.
• Stop-limit order: also waits for a stop price, but then places a limit order instead of a market order. You control the worst price, but if the market gaps past your limit, the order may not fill and you can stay in the position.
• Take-profit order: a sell limit placed above the current price to lock in a target. Some exchanges label it separately; the mechanics are the same.

Not every exchange offers every order type, and names differ between platforms, so read the order ticket carefully before you confirm.

How long does a limit order last?

That depends on the "time in force" you choose and what your exchange supports. Common options include:

• Good 'til cancelled (GTC): stays open until it fills or you cancel it. Some platforms still cancel very old orders after a set period.
• Good 'til date or time: expires at a time you set.
• Immediate or cancel (IOC): fills whatever it can straight away and cancels the rest.
• Fill or kill (FOK): fills the whole quantity immediately or cancels entirely.
• Post-only: only rests on the book; if it would match immediately, it is cancelled instead. Traders use it to make sure an order is treated as a maker order.

Share-market "day orders" expire at the close of trading, but crypto markets run 24 hours a day, 7 days a week. A GTC crypto limit order can fill overnight or on a weekend while you are not watching, so only leave open orders you are still happy to have filled.

A worked example in Australian dollars

This example is entirely hypothetical. The numbers are invented to show the mechanics, ignore fees, and are not real prices or a forecast.

Imagine "Token X" on an AUD order book. The lowest asks are 200 tokens at A$2.10 and 300 tokens at A$2.12. You want 500 tokens.

• Market order. You buy 200 at A$2.10 and 300 at A$2.12, paying A$1,056 in total, an average of A$2.112 per token. It is done instantly.
• Buy limit at A$2.15. Because A$2.15 is above the lowest asks, the order fills straight away at the same A$2.10 and A$2.12 prices, since you pay your limit or better. The limit would only stop you buying above A$2.15.
• Buy limit at A$2.00. Nothing fills yet, and your bid sits on the book. Overnight, sellers come in at A$2.00 and 300 tokens trade, costing A$600. Then the price rises and the other 200 never fill. You hold 300 tokens and an open order for 200, which you can leave, change or cancel.

The A$2.00 limit got a better price on the tokens it bought, but not the full amount. That trade-off between price and certainty is the core of every limit order.

Advantages and disadvantages of limit orders

Advantages:

• Price control. You never pay more (or sell for less) than your limit.
• Protection from slippage beyond your limit, which matters most in thin or volatile markets.
• Planning. You can set entry and exit prices in advance instead of reacting to every move.
• Possible lower fees where an exchange charges less for maker orders.

Disadvantages:

• No guarantee of a fill. The price may never reach your limit, or move through it too quickly.
• Partial fills can leave you with an awkward amount and an open order to manage.
• Missed moves. A limit set a few cents too low can miss a rally entirely.
• Forgotten orders. An old GTC order can fill months later, when your plans have changed.

Why didn't my limit order fill?

The usual reasons are that the market never reached your price, that it reached your price only briefly and orders ahead of you in the queue used up the available volume, or that the order expired or was cancelled by its time-in-force setting. On some platforms an order can also be rejected for reasons such as insufficient balance or a minimum order size. Check the order history on your exchange for the exact status.

Limit orders for Australians

• Instant buy vs the order book. Many Australian exchanges offer an instant-buy screen and a separate order-book ("markets") screen. Limit orders are usually only available on the order-book side, and the instant-buy price often includes a spread. Compare both before you buy, for example on our how to buy Bitcoin in Australia guide or the buy Bitcoin and buy Ethereum pages.
• AUD pair depth. AUD order books can be thinner than a coin's busiest global pairs, particularly for smaller altcoins. A limit order helps you avoid filling far from the last traded price.
• Spreading purchases. Some people use a series of limit orders at different prices as part of a plan to buy over time. Our dollar-cost averaging guide explains the regular-purchase approach.
• Decentralised exchanges. Most swaps on a DEX execute immediately against a liquidity pool, controlled by a slippage tolerance rather than a limit price. Some DEX interfaces and aggregators offer limit-order features built on smart contracts, with their own mechanics and fees. Our DEX guide covers the basics.
• Records and tax. Each fill is a separate trade at its own price, so a partly filled order can create several records. The ATO generally treats selling crypto, or swapping one crypto for another, as a capital gains tax event; see the ATO's crypto asset investments guidance. This is general information, not tax advice.
• Independent sources. The same order types apply on share markets; Investor.gov has a plain-English types of orders explainer and Investopedia has a detailed limit order definition. Moneysmart, run by the Australian Securities and Investments Commission (ASIC), says most crypto assets are high risk and you should be prepared to lose everything you put in. Read its crypto assets page before you trade.

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