Solana activated the first of five SIMD-0437 rent-reduction steps on mainnet Beta at epoch 1028, lowering lamports_per_byte from 6,960 to 6,333, or about 9%. The parameter determines the refundable SOL deposit required to keep an account rent-exempt. The full plan targets a gradual reduction to 696 lamports per byte, equivalent to a 90% cut in on-chain storage costs, and could make up to $319 million in previously locked account balances recoverable, although that figure is neither guaranteed nor a conventional airdrop. Existing accounts remain operational and can reclaim surplus balances above the new minimum. Token accounts can use the WithdrawExcessLamports instruction from the reimplemented Token Program, known as P-token, while custom program-owned accounts such as DeFi vaults and escrow PDAs require resizing and bespoke transfer logic. The remaining feature gates depend on reviews of state growth under current rent levels and have no announced activation dates.