Solana Doubles Inflation Decay Rate Under SIMD-0550, Reaching Floor in Half the Time

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Solana's long-standing inflation schedule, unchanged since 2021, is being modified by proposal SIMD-0550, which doubles the annual taper rate from 15% to 30%. The change is designed to activate seamlessly — the inflation rate on activation day remains identical to the day before, with all effects felt only going forward. Under the new curve, Solana's inflation is projected to hit its 1.5% terminal floor in roughly three years from activation, compared to about six years under the old schedule. Anchored at the live mainnet rate of 3.65% at epoch 1035 in September 2026, the new curve would deliver approximately 27% less cumulative issuance over the first three post-activation years. The foundation's 5% share of issuance has already ended, meaning all new inflation now flows entirely to stakers and validators.

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