Target Date Funds: Set and forget or active trap?

We were working through target date funds: set and forget or active trap?, and the useful part is not a perfect rule. It is having a quick way to spot the tradeoff before the decision gets emotional.

A few things we would pull into the post:

• Start with one real number instead of a broad recommendation.
• Show the monthly impact first, then the yearly total.
• Call out the catch, like taxes, fees, timing, or cash-flow risk.
• Keep the calculator link as a follow-up, not the whole point of the post.

One thing we are trying to keep honest here is the gap between a clean rule and a month with repairs, groceries, medical bills, or irregular pay. The calculator can help after that first pass, but the discussion starts with naming the assumption and checking whether the monthly number still works when life is not perfectly average.

The main angle is to make the math easy to sanity-check without turning it into personal financial advice. Which retirement assumption do you think people underestimate most?

Full write-up: https://affordably.ai/blog/target-date-funds-set-and-forget-or-active-trap

Calculator: https://affordably.ai/calculators/401k

Educational only, not financial advice.