Perpetual funding can be a payment or a receipt depending on position direction and the rate’s sign. It differs from opening and closing commission and is not necessarily calculated on allocated margin. Record the contract, value basis, period, currency and actual settlements before interpreting its cost.
A margin allocation of 100 would be a different denominator. These are educational figures, not current rates.
BTKWIN.COM · EDUCATIONAL EXAMPLEIdentify the product and payment direction
Perpetual contracts use funding mechanisms intended to help align their pricing with a reference under the product’s design. In a common arrangement, positive funding has long positions paying shorts, while a negative rate reverses that direction. Confirm the displayed sign convention in both the quote and settlement record.
The Bybit funding-fee guide documents the direction and calculation for its contracts. Funding is not a fixed network charge or automatically a commission retained by the exchange. Identify who pays and receives within the actual mechanism.
Also distinguish perpetual funding from spot-margin borrowing costs. An interface can translate both with similar terminology while applying different formulas, timing and counterparties. Record contract type and settlement currency before selecting a calculation.
Calculate the amount using the correct base
Assume a hypothetical linear contract calculates one period’s funding on a position value of 1,000 settlement-currency units at a final rate of 0.01%. Convert the percentage to decimal by dividing by 100: 0.01% becomes 0.0001. Multiplication gives 1,000 × 0.0001 = 0.10.
If allocated margin is 100, substituting that amount for position value would give 0.01, one-tenth of the assumed correct payment. Collateral and the payment’s calculation base are different quantities. Read the contract’s defined position value instead of assuming the amount posted to open the position is the fee base.
After calculating the 0.10 payment, you can compare it with margin: 0.10 ÷ 100 = 0.1%. That is a derived burden relative to allocated margin, not the original 0.01% rate relative to position value. Label both denominators to avoid displaying one percentage as the other.
| Hypothetical input or result | Amount | Role |
|---|---|---|
| Position value | 1,000 | Payment base in this model |
| Margin allocation | 100 | Separate collateral measure |
| Period rate | 0.01% | 0.0001 as a decimal |
| Funding amount | 0.10 | Value multiplied by period rate |
| Payment / margin | 0.1% | A second ratio with another denominator |
Recalculate each period when values and rates change
Suppose a hypothetical long pays when rates are positive and receives when negative. At value 1,000 and +0.01%, it pays 0.10. At value 1,100 and +0.02%, it pays 0.22. At value 900 and −0.01%, it receives 0.09. Net payment is 0.10 + 0.22 − 0.09 = 0.23.
Taking an average rate and multiplying it by the final position value does not reproduce this sequence because the bases changed. Save the applicable value, final rate, direction and payment for each settlement. If your cash-flow convention uses positive for receipts and negative for payments, apply it consistently throughout the record.
Confirm the period and settlement mechanism
Do not assume every contract settles every eight hours. The Kraken MTF funding examples illustrate a product with hourly rate periods and continuous accrual characteristics. Their educational figures are not current quotes for all derivatives.
The Bybit rate explanation describes how a displayed rate can evolve before settlement. Read the current contract’s interval and whether the screen shows a forecast, a developing estimate or an already applied final rate. A saved earlier number is not necessarily evidence of a later actual charge.
If eligibility depends on holding a position at a settlement event, clicking close just before the displayed time does not alone establish when the server completed execution. Inspect fills, server timestamps and the funding record. Avoid using live opening and closing as an experiment to discover rules that can be read or studied in a documented practice setting.
Annualization is an assumption, not promised income
Assume solely for arithmetic that a rate of 0.01% stays unchanged every eight hours, with three eligible periods each day and a constant position value. Simple multiplication gives 0.03% daily and 10.95% over 365 days. That is a projection under fixed inputs, not a future return available on demand.
The rate can change sign, position value can change and eligibility can end. Fees and price losses are excluded from that projection. Do not automatically compound it as though receipts can be reinvested into an unchanged base without another decision, cost or risk.
A percentage relative to small initial margin can look especially large because exposure exceeds that margin. Show the cash amount, base and period before the percentage. A large margin-relative funding figure does not establish low risk or eliminate the position’s other potential losses.
Linear and inverse contracts need their own units
A simple linear value can be quantity multiplied by its defined reference price. An inverse contract can instead express settlement value in the underlying asset using a contract-specific quantity divided by price. Contract multipliers and specifications matter. Do not copy the linear multiplication example into every instrument.
If funding is received in a volatile asset, later conversion to a reference currency adds another valuation effect. Preserve the original amount and time and apply an identified conversion when needed. Adding 0.1 of one token to 0.1 of another settlement asset does not produce a meaningful common-value total without conversion.
Inspect the debit source and the inclusive result
Funding can affect an available balance or margin resources according to product rules. Read where the actual amount was debited and compare the funding ledger with the account movements. An unchanged position quantity does not mean account support remained unchanged after periodic charges.
A receipt of 0.10 also does not protect against a price loss of twenty. Funding is one component among price result, commissions and other costs. The collateral-scope guide explains why support and payment sources should be documented separately.
Assume gross price profit of five, opening and closing commissions totaling one and net funding paid of 0.23. Inclusive result is 5 − 1 − 0.23 = 3.77. If gross price loss were five instead, inclusive result would be −6.23. Do not deduct funding again from a report already showing the inclusive 3.77.
Keep contract, direction, settlement unit, rate status, period, calculation base and actual payment records together. Use the transfer calculator only for a distinct transport step when relevant. The complete ledger is a better guide to what happened than turning the latest displayed funding rate into a fixed-income promise.
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English content and examples reviewed: 27 October 2026. Read the Arabic edition.
