SIMD-0480: Deprecate Rent Burn Percent

proposals/0480-deprecate-rent-burn-percent.md

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+---
+simd: '0480'
+title: Deprecate Rent Burn Percent
+authors:
+  - Dean Little (@deanmlittle)
+category: Standard
+type: Core
+status: Accepted
+created: 2026-03-03
+feature: (fill in with feature tracking issues once accepted)
+---
+
+## Summary
+
+Set `burn_percent` in `Rent` to `0` and deprecate it from the protocol.
+
+## Motivation
+
+The `burn_percent` value in `Rent` is no longer used anywhere in the protocol 
+and has already been flagged as deprecated in `solana-sdk@4.0.1`. 
+Unfortunately, its value being set in the Rent sysvar account recently 
+resulted in a network divergence on testnet. With many upcoming changes to 
+Rent, it would be ideal to clean this up by zeroing out the sysvar value 
+moving forwards.
+
+## New Terminology
+
+N/A
+
+## Detailed Design
+
+Set the value of `DEFAULT_BURN_PERCENT` to `0`, update `burn_percent` value in 
+`Rent` sysvar and `RentCollector` to `0`.
+
+```rs
+pub const DEFAULT_BURN_PERCENT: u8 = 0;
+```
+
+## Alternatives Considered
+
+- Leave current value at `50`
+
+## Impact
+
+Reduce footguns in future Rent changes by removing a vestigial feature of the 
+protocol.
+
+## Security Considerations
+
+None.
+
+## Drawbacks
+
+None.
+
+## Backwards Compatibility
+
+This feature is backwards compatible.