Pre- vs post-retirement asset allocation

Most retirement planning assumes two different returns: a higher, equity-heavy one while you’re still working and contributing, and a lower, more conservative one once you retire and start withdrawing. That shift isn’t arbitrary — it reflects a real change in what your portfolio can afford to risk once you’re relying on it for income rather than adding to it.

Why the conventional advice is to shift

While you’re working, a market downturn is mostly an inconvenience — you keep contributing, prices eventually recover, and you weren’t relying on the portfolio for cash in the meantime. In retirement, a downturn hits differently: you’re withdrawing from a shrinking balance during the exact period it’s down, which locks in losses that a portfolio still being contributed to would have simply ridden out. Shifting toward safer, lower-volatility assets reduces that exposure, at the cost of a lower expected return.

How sensitive your required corpus really is

Why this isn’t a free lunch

That gap makes the aggressive assumption look tempting — save less today, need less overall. But assuming a 12% return through retirement means staying equity-heavy while withdrawing, which is exactly the setup where a bad sequence of early returns does the most damage: a downturn in your first few retirement years, combined with ongoing withdrawals, can permanently impair a corpus that would have recovered fine if it were still being contributed to rather than drawn down. Sequence of returns risk covers that mechanic in detail.