Perpetual futures feel simple because there is no expiry date, but that convenience creates a recurring cost: funding. Binance Academy explains that funding rates help keep perpetual contract prices aligned with spot markets, while Binance’s futures documentation breaks the rate into components such as premium and interest. Bybit’s help center summarizes the trader-level result with a direct formula: funding fee equals position value multiplied by the funding rate.
This matters because a trade can be directionally right and still lose money after costs. A leveraged long may profit from a small price rise, but if it pays repeated positive funding while price moves sideways, the holding cost can eat the edge. A short position can face the same issue when the market’s funding direction flips.
The first calculation should be position value, not account equity. A trader holding a notional position that is several times larger than account balance is paying or receiving funding on that larger notional exposure. Mark price also matters because exchanges generally calculate position value and liquidation logic from mark or index-linked prices rather than the last traded tick.
A simple checklist can prevent many beginner mistakes: check the next funding time, current rate, estimated rate, whether you pay or receive, expected holding period, and whether spot or dated futures can express the same view with less recurring cost. Funding arbitrage sounds attractive, but fees, slippage, borrow constraints and liquidation risk can erase the headline yield.
Sources: Binance Academy funding-rate explainer; Binance Futures funding-rate documentation; Bybit funding-fee calculation guide.
Risk notice: Perpetual futures are leveraged products. Funding rates, mark prices and liquidation levels can change quickly; this article is educational and is not a recommendation to use leverage or pursue funding strategies.
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