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marc0olo merged 2 commits into from
Jun 29, 2026
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docs: clarify how to change the SNS token transfer fee #306

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docs: clarify how to change the SNS token transfer fee
marc0olo Jun 29, 2026
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docs: strengthen caution that desyncing transaction_fee_e8s breaks ne…
bjoernek Jun 29, 2026
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8 changes: 8 additions & 0 deletions docs/guides/governance/managing.md
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Expand Up @@ -121,6 +121,12 @@ type NervousSystemParameters = record {
};
```

:::caution[Changing the SNS token transfer fee]
Do not use `ManageNervousSystemParameters.transaction_fee_e8s` to change the SNS token transfer fee. This field updates only Governance's stored parameter, not the SNS ledger canister. Worse, because Governance uses this stored value as the fee for its own neuron-operation transfers (disbursing, splitting, staking maturity, and so on), setting it to a value that differs from the ledger's actual fee will cause those transfers to be rejected by the ledger (`BadFee`), breaking neuron operations.

To change the actual ledger transfer fee, submit a [`ManageLedgerParameters`](#manageledgerparameters) proposal with `transfer_fee` set. On successful execution, the ledger fee is updated and Governance's `transaction_fee_e8s` is synced to the same value automatically.
:::

For a description of each parameter and its effect, see the [SNS settings reference](../../references/sns-settings.md).

### ManageSnsMetadata
Expand Down Expand Up @@ -155,6 +161,8 @@ quill send message.json

Updates ledger parameters: transfer fee, token name, token symbol, or token logo. Fields set to `null` remain unchanged.

Use `transfer_fee` here to change the SNS token transfer fee; this is the only proposal that updates the actual fee charged by the ledger. On successful execution, it also syncs Governance's `NervousSystemParameters.transaction_fee_e8s` to the same value, so a separate `ManageNervousSystemParameters` proposal is not needed.

```bash
quill sns \
make-proposal $PROPOSAL_NEURON_ID \
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2 changes: 1 addition & 1 deletion docs/references/sns-settings.md
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Expand Up @@ -43,7 +43,7 @@ For background, see [SNS framework](../concepts/sns-framework.md).

| Parameter | Type | Description |
|---|---|---|
| `transaction_fee_e8s` | `nat64` | Per-transfer fee on the SNS ledger, in e8s. Does not apply to minting or burning. |
| `transaction_fee_e8s` | `nat64` | Governance's stored copy of the per-transfer ledger fee, in e8s. Does not apply to minting or burning. Do not set this field via `ManageNervousSystemParameters` to change the fee: it updates only Governance's copy, not the ledger. Change the fee with a `ManageLedgerParameters` proposal instead, which updates the ledger and syncs this field automatically (see [Managing an SNS](../guides/governance/managing.md#manageledgerparameters)). |

## Voting reward settings

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