Encyclopedia How the network works · Entry 79
Bitcoin change addresses: where the rest of a payment goes
In this article
At a glance
Key facts
| Fact | Detail | Source |
|---|---|---|
| Conservation | Input value equals output value plus transaction fee. | [1] |
| Separate output | Change is a new UTXO, not an unspent remainder inside an old one. | [1] |
| Position | The wallet RPC reports where it placed change; it need not always be the last output. | [2] |
Account for every satoshi
A wallet spends an input worth 100,000 satoshis, pays a recipient 60,000 and pays a 1,000-satoshi fee. It can create 39,000 satoshis of change. The original 100,000-satoshi output has been consumed; the recipient and change outputs are new records.
An explorer can show both destinations without knowing that one is your change. Wallet ownership information and derivation records explain more than the shape or position of an output.
Why change may use an unfamiliar address
A deterministic wallet can derive separate receiving and change keys from its key hierarchy. Generating another address does not mean opening another account with the network. Your backup must cover the keys or descriptors needed to locate and spend the outputs.
Repeatedly using one address can make activity easier to link. A fresh change address is helpful wallet practice, but it does not make the transaction graph private or guarantee that observers cannot infer relationships.
Do not confuse change with the fee
The fee is the difference between total inputs and total outputs. It is not a mysterious extra output. When reviewing a payment, compare the actual recipient amount and fee rather than assuming every unfamiliar output is a loss.
Different funding options can subtract fees from recipient outputs or add selected inputs. The final signed transaction is the record to inspect.
Direct answers
Questions people ask
Can I spend change later?
Yes, if you control its spending conditions and it remains unspent. Unconfirmed change may have additional wallet and relay restrictions until its parent confirms.
Inspect the evidence
The answer and key facts have stable claim links. These records retain the scope and qualification when reused.
A Bitcoin transaction spends selected UTXOs in full. If their value exceeds the recipient amount plus the fee, the wallet can create a change output controlled by the sender. A new change address is usually another destination derived or managed by that wallet, not a separate charge.
Scope: Bitcoin · data through 2026-10-02. Verification: verified · 2026-10-02T18:15:23.891Z.
Link to this claimConservation: Input value equals output value plus transaction fee.
Scope: Bitcoin · data through 2026-10-02. Verification: verified · 2026-10-02T18:15:23.891Z.
Link to this claimSeparate output: Change is a new UTXO, not an unspent remainder inside an old one.
Scope: Bitcoin · data through 2026-10-02. Verification: verified · 2026-10-02T18:15:23.891Z.
Link to this claimPosition: The wallet RPC reports where it placed change; it need not always be the last output.
Scope: Bitcoin · data through 2026-10-02. Verification: verified · 2026-10-02T18:15:23.891Z.
Link to this claimRevision history
- — Initial Bitcoin encyclopedia entry at this permanent URL.
- — Added reusable claims, explicit source locators, and matching Markdown and JSON. This publishing change does not itself establish factual verification.
Source register
Sources and references
Retrieval dates and locators are recorded individually.- Bitcoin Developer Guide: TransactionsBitcoin developer documentation contributors
UTXO inputs, transaction outputs, change and the difference paid as a fee.
Locator: P2PKH Script Validation; Transaction Fees And Change · Retrieved: 2026-10-02T17:03:41.190ZOpen source - walletcreatefundedpsbt RPCBitcoin Core
Input selection, fee units, change output, selected inputs and transaction funding.
Locator: Arguments and result fields · Version / scope: Bitcoin Core 29.0.0 RPC · Retrieved: 2026-10-02T17:03:40.827ZOpen source - Bitcoin Developer Guide: WalletsBitcoin developer documentation contributors
Spending keys, address derivation, backups and privacy trade-offs.
Locator: Wallet Programs; Public Key Distribution-Only Wallets; Hierarchical Deterministic Key Creation · Retrieved: 2026-10-02T17:03:41.163ZOpen source - Hierarchical Deterministic WalletsBitcoin BIPs contributors
Extended public keys, derivation and private-key exposure limitations.
Locator: Extended keys; Child key derivation; Security · Version / scope: BIP-32; immutable revision pinned in source URL · Retrieved: 2026-10-02T17:22:20.467ZOpen source
Research and drafting use AI assistance. A separate automated review checks claims against primary sources; no external expert or named human review is implied. Publication, substantive editing, source retrieval and verification are recorded separately. This version was independently checked by an automated reviewer on 2 October 2026.
Editorial method and correctionsDegrees of Satoshi editorial project. “Bitcoin change addresses: where the rest of a payment goes.” Published 2026-10-02; updated 2026-10-02. https://degreesofsatoshi.com/encyclopedia/bitcoin-change-addresses/