The interest calculation method is the same for auto-borrow and manual borrow. The core difference between the two lies in "when borrowing is triggered" and "who decides how much to borrow," not the interest rate itself. Starting from April 30, 2026, the first interest charge on Binance margin loans is calculated based on the actual borrowing duration (accurate to seconds). This rule applies to both auto and manual modes.
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Step 1: Understand the Trigger Logic Differences Between the Two Modes
Auto-borrow is "triggered automatically when placing an order." You don't need to borrow funds in advance. After enabling [Auto-Borrow] on the margin trading page, when the amount of your buy or sell order exceeds the available balance in your account, the system will automatically borrow the shortfall to complete the order. A successfully placed order means the borrowing is completed. Even if the order hasn't been filled yet, interest starts accruing from the moment the order is placed.
Manual borrow means "actively borrowing before placing an order." You first need to click the [Borrow] button in your margin account, enter the amount, confirm the borrowing, and then use the borrowed funds to place a regular order. Borrowing and placing an order are two separate steps. Interest starts as soon as the borrowing action is completed.
Key Takeaway: You should be able to explain that "auto-borrow = the system borrows alongside your order," while "manual borrow = borrow money first, then place an order."
Step 2: Look at Interest Calculation — They Are Exactly the Same, First Interest Calculated by the Second
From April 30, 2026, whether you use auto or manual borrowing, the first interest charge is calculated according to the actual borrowing time (accurate to seconds). It's no longer the old rule of "charging a full hour's interest as soon as you borrow."
First Interest Formula: Loan Principal × Hourly Interest Rate × (Actual Seconds / 3,600)
Example: You borrow 10,000 USDT at 05:30:49. There are 29 minutes and 11 seconds (i.e., 1,751 seconds) until the next hourly interest settlement at 06:00. With an hourly interest rate of 0.0004%, the first interest charge is 10,000 × 0.0004% × (1751 / 3600) ≈ 0.0195 USDT. Under the old rule, this interest would have been charged for a full hour (0.04 USDT).
After the first interest settlement, as long as the loan is not repaid, the system will charge interest for a full hour at each full hour until the loan is fully repaid.
Key Takeaway: You know that regardless of which mode you choose, interest is calculated as the hourly rate multiplied by the actual time the funds were used, and the first interest charge is measured in seconds.
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Step 3: Compare Core Differences — The Risks of Auto-Repay and the Control of Manual Repay
Auto-borrow is usually paired with auto-repay. After an order is filled, the system automatically uses the received assets to repay the corresponding debt, paying interest first and then principal. This mechanism is convenient, but there's a potential pitfall: if you use the funds to place new orders before the system deducts them for repayment, your account balance may become insufficient, causing the automatic repayment to fail. You would then need to manually repay the debt. Manual repayment avoids this "intercepted by yourself" problem. You are in control, deciding when and how much to repay.
High Risk: Even if an auto-borrow order is canceled without being filled, the interest already incurred must still be paid, because the borrowing action is completed the moment the order is successfully placed. If the filled amount is smaller than expected due to slippage, the system will only repay based on the actual filled amount, and you will need to manually cover any shortfall.
Common Failure Reason: Many people think "an unfilled auto-borrow order incurs no fees." In reality, the moment an order is placed, the money is borrowed and interest starts accruing, regardless of whether the order gets filled in the end.
How to Verify Your Operations: Switch between [Auto] and [Normal] modes on the margin trading page to confirm the current status. Then go to [Liability Record] or [Repayment History] to check the interest details, ensuring the interest-bearing period and amount match the rules.
