What Is a Solana Priority Fee?
A Solana priority fee is an optional additional fee that a user can attach to a transaction to increase the chance it gets processed quickly by the current block leader. Introduced to give users more control over transaction ordering, priority fees work on top of Solana's fixed base fee of 5,000 lamports per signature.
How Priority Fees Work
When a validator's scheduler receives multiple pending transactions, it orders them by a calculated priority score. Transactions with a higher compute unit price receive a higher score and are processed before those with lower or zero priority fees. This is especially important during periods of network congestion — such as popular NFT mints or high-volume DeFi activity.
Base Fee vs. Priority Fee
- Base fee: Fixed at 5,000 lamports per signature — always required.
- Priority fee: Optional. Set in micro-lamports per compute unit (CU).
- Priority fee formula:
ceil(CU price × CU limit / 1,000,000)lamports. - Default CU price is 0, meaning no priority fee unless you set one.
Who Needs Priority Fees?
- Developers building time-sensitive dApps (DEX trades, arbitrage bots).
- Users minting NFTs during high-demand events.
- Anyone whose transaction keeps failing or timing out during congestion.
- MEV strategies that require landing transactions in specific blocks.
Priority fees allow users to bid for transaction ordering priority in the Solana leader queue. Higher fees increase the probability of fast confirmation, especially during network congestion.
— Solana Official Documentation
Fee Distribution
When you pay a priority fee on Solana, the funds are not simply burned. The validator that processes your transaction receives 50% of the prioritization fee as a reward. The remaining 50% is burned, reducing SOL supply. This split-burn model incentivizes validators to prioritize higher-fee transactions while also making the network more deflationary over time.
Priority Fee Calculation Formula
The exact formula for computing your priority fee in lamports is:
Prioritization Fee = ceil(compute_unit_price × compute_unit_limit / 1,000,000)For example, if you set a compute unit price of 100,000 microlamports and your transaction uses 200,000 CUs, your priority fee is: ceil(100,000 × 200,000 / 1,000,000) = 20,000 lamports. At current SOL prices, this is a fraction of a cent.
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