Originally published on xroot.dev . The rent-cut post explained the economics: Solana is cutting the price of account storage by 90% in five feature-gated steps, and accounts funded at the old price keep every lamport they were funded with. The follow-up question arrived within a day of publishing it: if my account holds more rent than it now needs, can I get the difference back without closing it? For four kinds of account, yes. Here is the arithmetic per type, the instruction that ...