Negative funding rate explained: when shorts pay longs on perps

29 September 2026

A negative funding rate on a perpetual futures contract means traders holding short positions are paying a periodic fee to traders holding long positions. This payment happens at regular settlement intervals (typically every 1, 4, or 8 hours, depending on the exchange) and is designed to keep the perpetual contract price aligned with the underlying spot market price.

Why funding rates go negative

Funding rates are not random. They reflect the balance of demand between long and short positions in the perpetual market. When the majority of traders are bearish - more open interest in shorts than longs - the contract price tends to trade below the spot price. The exchange’s funding mechanism then sets a negative rate to incentivize new long entries and discourage existing shorts.

A negative rate means: - Short position holders pay a percentage of their position size to long holders. - Long position holders receive that payment, regardless of whether their trade is profitable on price movement.

The rate itself is calculated from the difference between the perpetual contract price and the spot index price (the basis) plus a dampening or interest component, depending on the exchange’s formula. Most exchanges use a variation of: Funding Rate = Premium Index + clamp(Interest Rate - Premium Index, 0.05%, -0.05%). When the premium index is negative enough, the entire rate becomes negative.

What happens during a negative funding period

1. Shorts Are Charged at Settlement

At each funding timestamp (e.g., 00:00, 08:00, 16:00 UTC), the exchange debits the short trader’s wallet balance by:

Position Size × Funding Rate

If the rate is -0.01%, a short of 10,000 USDT worth of contracts pays 1 USDT to the long side. This payment is taken from available margin, not from unrealized P&L, so it directly reduces the short’s equity.

2. Longs Receive the Payment

Longs get the same amount credited to their wallet, added to available balance. This is pure cash flow on top of any price gains or losses.

3. Funding Rate Can Change at Each Settlement

A negative rate today does not guarantee it stays negative tomorrow. If enough traders close shorts or open longs, the basis can flip to positive, and shorts will start receiving instead of paying.

How leverage magnifies the effect

Funding is applied to the full notional position size, not just the margin you posted. That means a 10x leveraged short of 10,000 USDT pays funding on the full 10,000 USDT, even though you only put up 1,000 USDT of margin. Higher leverage means a larger effective funding cost relative to your collateral.

Example with simple numbers: - Position size: 10,000 USDT - Margin at 10x leverage: 1,000 USDT - Funding rate: -0.01% - Funding cost: 10,000 × 0.0001 = 1 USDT - Cost as percentage of margin: 0.1% per settlement

Over 24 hours (three settlements), that same 10x short would pay 3 USDT, or 0.3% of margin. If the negative rate persists for days, the cumulative cost can be significant - especially on high leverage.

The relationship between negative funding and liquidation

Negative funding does not directly cause liquidation, but it accelerates it for shorts. Each funding payment reduces the short’s margin balance. If you are already near your liquidation price, a series of funding charges can push you over the edge.

Conversely, longs receiving funding get a small buffer. Their margin increases at each settlement, making liquidation slightly less likely - though price movement against them can still erase that advantage quickly.

How traders respond to negative funding

• Short sellers monitor funding costs before opening positions. A deeply negative rate may make holding a short unprofitable even if price falls, because the funding payments eat into gains.
• Long holders may hold positions longer if receiving funding, especially in flat or slightly bearish markets where the cash flow compensates for small price declines.
• Arbitrageurs execute cash-and-carry trades: buy spot, short the perpetual, and collect the positive funding (if the rate flips positive) or avoid paying negative funding by hedging.

When negative funding is extreme

Most exchanges impose caps on funding rates (e.g., ±0.75% per settlement) to prevent extreme imbalances. If the rate hits the cap, it signals extreme bearish sentiment. This can happen during sharp selloffs or when the market expects a major negative event. However, capped negative rates also attract contrarian traders who see a potential short squeeze: if enough shorts exit or get liquidated, the price can spike and flip funding positive quickly.

Practical Steps for a Short Position in a Negative Rate Environment

1. Check the current funding rate on the exchange’s contract details page before opening the trade. Look for “Funding Rate” or “Next Funding” fields.
2. Calculate the cost over your intended holding period. If you plan to hold for three days, multiply the current rate by the number of settlements in that window.
3. Set a funding cost budget as part of your risk management. If the cumulative cost exceeds your expected profit on price movement, the trade may not be worth taking.
4. Monitor rate changes at each settlement. Some exchanges display a “predicted” or “estimated” funding rate for the next period based on current order book imbalance.
5. Consider closing before funding timestamps if the rate is negative and you want to avoid payment. Note that many traders do this, which can cause temporary price spikes near settlement times.

Negative funding is a mechanical cost of holding a short position in perps. It is not a signal to buy or sell - it is simply the market’s way of balancing long and short demand over time.

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