Using Funding Rates When Trading Perps: Costs, Crowding and Limits
Funding is a cost on every perps position held through a funding time. Here is how to calculate it and what it really says about positioning.
Funding rates matter to a perps trader in two ways. They are a cost or income on every position held through a funding time, and they show which side is paying to stay in. They are not a trading signal on their own. This guide shows how to read funding, what it costs over a hold, and what crowded funding can and cannot tell you.
Key takeaways
- Funding cost per interval = position notional × funding rate for that interval.
- Positive funding means longs pay shorts; negative funding means shorts pay longs.
- Funding is small for intraday trades and adds up fast on multi day holds at high rates.
- Extreme funding shows crowded positioning, but crowds can stay crowded for a long time.
What is the funding rate on a perpetual future?
A perpetual future has no expiry date, so nothing forces its price back to spot. Funding does that job. At set intervals, traders on one side pay traders on the other side. Many large exchanges settle funding every 8 hours, and some settle every hour.
When the perp trades above the spot index, funding is usually positive and longs pay shorts. That makes holding a long more expensive and pulls the perp back toward spot. When the perp trades below the index, funding turns negative and shorts pay longs. The exchange does not keep this money. It passes between traders.
On most venues you pay or receive funding only if you hold the position at the funding timestamp. Close one minute before and you pay nothing for that interval. Open one minute after and you wait for the next one. Several large exchanges also build a small fixed interest component into the formula, so a quiet market often shows a small positive default rate. Check your venue’s funding page for its exact formula, interval and caps.
New to perps? Start with what perpetual futures are, then come back here.
How do you work out funding cost over a holding period?
Funding per interval = position notional × funding rate per interval
Funding over a hold = notional × average rate × number of intervals held
Notional is the full size of the position, not your margin. A $20,000 BTC long costs the same funding whether you posted $2,000 or $10,000 of margin. Most venues value the notional at mark price at the funding time.
Example figures, all on a $20,000 long with 8 hour funding, so three intervals per day:
| Rate per 8 hours | Per interval | Per day | Over 5 days |
|---|---|---|---|
| 0.01% | $2 | $6 | $30 |
| 0.03% | $6 | $18 | $90 |
| 0.05% | $10 | $30 | $150 |
| 0.10% | $20 | $60 | $300 |
Check the first row: $20,000 × 0.0001 = $2 per interval. Three intervals make $6 a day. Five days make $30. At 0.10% the same hold costs $300, which is ten times as much.
Now compare that cost with the trade itself. Say you risk $200 on the position with a target of $600. At 0.01% funding, five days of funding is $30, or 5% of the target. At 0.10%, it is $300, half the target. A trade that looked like 3R gross is closer to 1.5R after funding, before any trading fees.
Annualizing helps you compare. A rate of 0.01% every 8 hours is 0.03% a day, or about 11% a year on notional. That is a real carrying cost for a swing position held for weeks.
What does crowded funding tell you?
Funding is driven by the gap between the perp price and the index. A persistently high positive rate means buyers on the perp have been willing to pay up to hold longs. That is a fact about positioning in leveraged derivatives. It is not a forecast.
Read funding alongside open interest and price:
- Price up, open interest up, funding rising: new leveraged longs are joining. The move has fuel, and it also has more positions that could be forced out on a sharp drop.
- Price up, open interest down, funding falling: shorts are closing. The rally may be a squeeze rather than fresh buying.
- Price flat, funding very high: longs are paying heavily while price goes nowhere. That pressure costs them money every interval.
- Funding deeply negative into a selloff: shorts are crowded. A bounce can force them to buy back quickly.
Crowded positioning raises the chance of a sharp move against the crowd if price turns. It says little about when that happens. Funding has stayed high for weeks during strong trends, and traders who faded it early paid funding and lost on price.
What funding does not tell you
- It does not give direction. High funding fits both a healthy trend and a top. You need price structure to tell them apart.
- It does not show the whole market. Each venue has its own rate. One exchange can be crowded while others are not.
- It is not a reliable timing tool. Extremes can last, and the reversal can start without warning.
- It is not a free income stream in a prop account. Being paid funding while price moves against you is still a loss.
You may read about funding carry, where a trader holds spot long and the perp short to collect positive funding. That needs a spot position, collateral on two legs and careful risk control. Most prop firm accounts only offer the perp leg, so it is outside what this guide covers.
A practical way to use funding in your process
Use funding as a filter and a cost line, not as an entry trigger. This is an example process, not a proven edge:
- Before entering any trade you may hold past a funding time, note the current rate and the next timestamp.
- Estimate funding for your expected hold and subtract it from your target. If the trade no longer offers at least your minimum reward to risk, skip it.
- If funding on your side is at an extreme for that market, cut size or demand a cleaner setup. You are joining a crowd that pays to be there.
- For intraday trades, check whether a funding time falls inside your window. One interval is usually small, but it still shows in your PnL.
- Log the funding paid or received on every trade in your journal, so your results reflect true costs.
How this fits prop firm rules
Perps prop firms differ on whether simulated accounts apply funding at all, and how. Some apply it like the exchange feed they copy. Others leave it out. If funding is applied, it changes your balance, and a funding payment can count toward your daily loss limit just like a trading loss.
Example figures: a $100,000 notional position on a $50,000 account with a $1,000 daily loss limit. At 0.10% per 8 hours, one interval costs $100, which is 10% of your daily limit gone without a single tick of price movement. Hold through three intervals and that is $300.
Some firms also restrict holding over weekends or limit how long positions can stay open. Rules vary by firm; check each firm’s page on PropFirmXchange. Our perps prop firms list shows the published rules, and find an account filters by budget. For how losses count toward limits, see the daily loss limit guide.
Questions traders ask
Do I pay funding if I close before the funding time?
On most venues, no. Funding is paid only by positions open at the funding timestamp. Check your exchange or firm’s documentation, since methods can differ.
Is high positive funding a sell signal?
No, not on its own. It shows longs are crowded and paying to hold, which raises the risk of a sharp drop if price turns. Strong trends often carry high funding for long stretches.
Does leverage change how much funding I pay?
Only through position size. Funding is charged on notional, so more leverage lets you hold a bigger position, and a bigger position pays more. The same notional pays the same funding at any leverage.
Trading perpetual futures carries a high risk of loss, and funding can add to losses on any position. Most prop firm accounts are simulated. Nothing here is financial advice.