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+---
+simd: '0185'
+title: Vote Account v4
+authors: Justin Starry (Anza)
+category: Standard
+type: Core
+status: Review
+created: 2024-10-17
+feature: (fill in with feature tracking issues once accepted)
+---
+
+## Summary
+
+A new update for the vote program is proposed to free up state space used for
+unnecessary bookkeeping.
+
+## Motivation
+
+Over 40% of vote state size is reserved for tracking a history of 32 prior
+authorized voters in the `prior_voters` field. Having such a long history of
+prior voters is not useful onchain and for offchain usecases this information
+can be fetched via other means.
+
+By removing the `prior_voters` field, the space in vote accounts can be used for
+future field additions to vote state without needing to reallocate existing vote
+accounts.
+
+## Alternatives Considered
+
+NA
+
+## New Terminology
+
+NA
+
+## Detailed Design
+
+### Vote Account 
+
+A new version of vote state will be introduced with the enum discriminant value
+of `3u32` which will be little endian encoded in the first 4 bytes of account
+data. 
+
+```rust
+pub enum VoteStateVersions {
+    V1(..),
+    V2(..),
+    V3(..),
+    V4(VoteStateV4), // <- new variant
+}
+```
+
+This new version of vote state will remove the `prior_voters` field.
+
+```rust
+pub struct VoteStateV4 {
+    pub node_pubkey: Pubkey,
+    pub authorized_withdrawer: Pubkey,
+    pub commission: u8,
+    pub votes: VecDeque<LandedVote>,
+    pub root_slot: Option<Slot>,
+    pub authorized_voters: AuthorizedVoters,
+
+    /// REMOVED
+    /// prior_voters: CircBuf<(Pubkey, Epoch, Epoch)>,
+
+    pub epoch_credits: Vec<(Epoch, u64, u64)>,
+    pub last_timestamp: BlockTimestamp,
+}
+```
+
+### Vote Program
+
+Whenever a vote account is modified by the vote program in a transaction AND
+hasn't been updated to v4 yet, the account state MUST be saved in the new
+format. New vote accounts should still be allocated with the same size (3762
+bytes) as the prior vote state version to keep extra space for future field
+additions.
+
+#### `Authorize`, `AuthorizeChecked`, `AuthorizeWithSeed`, `AuthorizeCheckedWithSeed`
+
+Since `prior_voters` will be removed in the new vote state version, existing
+authorize instructions will no longer need to update `prior_voters` when setting
+new authorized voters.
+
+## Impact
+
+This is a prerequisite for implementing custom block fee collection in SIMD-0232.
+
+## Security Considerations
+
+NA
+
+## Drawbacks *(Optional)*
+
+NA
+
+## Backwards Compatibility *(Optional)*
+
+A new feature gate will be added to switch over vote accounts to the new state version.