Why funding exists
A perpetual does not have the same expiry as a dated future. Its price can diverge from the underlying reference. Funding payments aim to encourage balance: maintaining one side can cost money while the opposite side receives a payment. The mechanism does not force prices to match at every moment.
This guide covers the cost of holding exposure rather than predicting Bitcoin’s price. Start with spot versus futures if contract, asset and margin are unfamiliar. Merely depositing USDT without opening a position does not itself produce these funding payments.
Who pays under a positive or negative rate
With a positive rate, longs pay shorts; with a negative rate, shorts pay longs under the contract rules. The same percentage has opposite effects depending on your side. Read both the sign and position direction rather than the percentage’s absolute size alone.
A screen may display an estimated next rate and a settlement countdown. That estimate is not necessarily the final charge. Funding history shows what was actually settled; the trading panel provides information about an upcoming settlement.
The formula for a linear contract
For a straightforward linear contract, funding equals position value multiplied by the interval’s rate. Position value normally uses contract quantity and the provider’s specified mark price. The calculation is not simply applied to the margin you set aside to open the position.
Assume 5,000 USDT notional and a positive 0.01% rate. Then 5,000 × 0.0001 = 0.50 USDT: a long would pay that amount and an equally sized short would receive it. This demonstrates the formula, not a live rate or guaranteed payment.
Why leverage changes the charge relative to margin
If that 5,000 USDT exposure is supported by 500 initial margin, a 0.50 payment equals 0.10% of the margin even though the displayed rate is 0.01%. Changing the leverage setting does not remove funding for the same notional. The exposure used in the calculation is what matters.
Inverse contracts may use another formula and payment currency. Do not apply the linear example automatically to any instrument containing BTC in its name. Check the contract specification, size unit and settlement balance before estimating its holding cost.
Compare the rate and interval together
Not every pair settles every eight hours. Intervals can differ between contracts and change under certain conditions. A 0.01% hourly rate is not equivalent to 0.02% every eight hours, although the first percentage looks smaller. Establish the period represented by each number.
For a constant hypothetical 5,000 notional and constant rates, eight hourly payments at 0.01% total 4 USDT; one eight-hour payment at 0.02% costs 1 USDT. Actual rates, notional and timing can change. Multiplying one screenshot across a year does not reliably predict annual holding costs.
When an open position counts
Payment depends on the contract’s settlement conditions. Bybit describes payments for positions held at the relevant time and warns that intervals can vary. Check the actual pair’s schedule, not an old screenshot’s clock or a general rule for another market.
Closing just before the countdown is not costless: execution can take time, prices can move and reopening is another trade. If avoiding a payment drives the decision, compare the expected funding amount with the fees and spread of an additional exit and entry.
Include funding in the complete result
Suppose the contract price movement produces 50 USDT realised profit, opening and closing cost 3, and funding paid totals 2. The net result for those items is 45. Received funding reverses that sign; check whether the history already includes it to avoid double counting.
Charges can affect available balances and collateral according to account rules. A thinly margined position remains vulnerable even when price barely moves. Read funding, margin and unrealised profit together, particularly when several positions share collateral.
What to compare and what not to infer
Compare the same contract, collateral currency, side and holding period. The Bybit, BTCC and LBank reviews distinguish products; a European spot fee cannot estimate an international perpetual’s funding. Available functions can also differ between accounts.
Positive funding does not guarantee a profitable short: a rise in the underlying can exceed the receipts. Hedging with spot introduces capital, execution and cross-platform risk. If you copy another trader, inspect the same costs through how copy trading works; automation does not remove them.
