How to Increase the Fee of an Unconfirmed Bitcoin Transaction in Electrum

Understanding Unconfirmed Transactions in Electrum

1. Bitcoin transactions remain unconfirmed until miners include them in a block.

2. Electrum displays pending transactions with zero confirmations in the History tab.

3. A low fee rate causes delays, especially during network congestion on the mainnet.

4. Electrum does not automatically rebroadcast unconfirmed transactions after wallet restarts unless explicitly configured.

5. The transaction must be replaceable via RBF (Replace-By-Fee) or CPFP (Child-Pays-For-Parent) to adjust fees post-broadcast.

RBF-Based Fee Increase Workflow

1. Open Electrum and ensure the wallet is synchronized.

2. Navigate to the History tab and locate the unconfirmed transaction.

3. Right-click the transaction and select Details to verify RBF status—look for “RBF: yes” under Transaction Properties.

4. Click increase fee in the bottom-right corner of the Details window.

5. Adjust the new fee rate using the slider or manual input; Electrum calculates the minimal bump required for timely confirmation.

CPFP as an Alternative Strategy

1. If RBF is disabled, the original transaction cannot be modified directly.

2. Create a new transaction sending from one of the unconfirmed transaction’s change outputs.

3. Assign a high fee to this child transaction while keeping the output amount minimal.

4. Broadcast the child transaction—miners evaluate the combined fee rate of parent + child.

5. This method relies on wallet control over change addresses and requires access to unspent outputs tied to the stuck transaction.

Electrum Configuration for Future RBF Support

1. Go to Wallet → Preferences → Transactions.

2. Enable “Enable Replace-By-Fee” before creating any new outgoing transaction.

3. Set default fee estimation mode to “ETA” or “Mempool.space” for dynamic fee suggestions.

4. Configure “Use dynamic fees” to allow automatic fee adjustments based on real-time mempool pressure.

5. Save settings and restart Electrum to apply changes across all future broadcasts.

Frequently Asked Questions

Q: Can I increase the fee of a non-RBF transaction in Electrum?A: No. Electrum only provides the “increase fee” option when RBF is signaled in the original transaction. Without RBF signaling, users must rely on CPFP or wait for natural confirmation.

Q: Why does Electrum show “RBF: no” even though I enabled RBF in preferences?A: RBF preference only affects newly created transactions. Previously broadcasted transactions retain their original signaling state and cannot be retroactively altered.

Q: Does increasing the fee guarantee faster confirmation?A: It improves priority in the mempool but does not guarantee immediate inclusion—confirmation depends on current block space demand and competing transaction fee rates.

Q: What happens if I attempt to increase the fee while the original transaction confirms?A: Electrum detects confirmed status and disables the “increase fee” button. No replacement transaction is generated, and the original remains valid on-chain.