My favorite resource lately is earlyretirementnow.com, particularly the Safe Withdrawal Rate series and their spreadsheet. It basically either expands upon or r

My favorite resource lately is earlyretirementnow.com, particularly the Safe Withdrawal Rate series and their spreadsheet. It basically either expands upon or rebuts every other commonly-recommended financial advice resource people tend to suggest. The basic mindset is you have to understand your expenses ie spend rate. People flush with income tend to forget that, thinking it's just for people living paycheck-to-paycheck and needing a budget. But it's essential for being able to project retirement reliably. And of the income/performance/expense triumvirate, it's the one that you have the most control over (assuming you're already investing responsibly).