Present bias is the tendency to weight immediate outcomes far more heavily than future ones, well beyond what any consistent rate of discounting would produce.

The inconsistency

Choosing between $100 today and $110 in a week, most people take the $100. Choosing between $100 in a year and $110 in a year and a week, most take the $110 — the same week's wait, the same extra $10, the opposite answer.

The difference is that one option is available now. Immediacy gets a premium that has nothing to do with the time interval, which is why preferences reverse as the near option approaches.

This is what makes plans fail rather than never get made. The plan is made at a distance, where the future is weighted normally. The choice arrives up close, where it is not, and the person who made the plan is outvoted by the person living in the moment it applies to.

What it explains

Most persistent gaps between intention and behavior. Training plans, saving, the difficult conversation, the work with delayed payoff. In business it explains why building leverage gets deferred: the billable hour pays today and the process document pays over two years.

It is the mechanism underneath proxy work — the comfortable task returns its reward immediately, and the uncomfortable one returns it later.

What helps

Commitment in advance. Decide while the choice is still distant and make the decision expensive to reverse. Standing appointments, automatic transfers, scheduled blocks, a commitment made to someone else.

Make the future concrete. Present bias feeds on the future being abstract. A specific figure and a specific date compete better than "later".

Move the immediate reward. Rather than fighting the preference, attach something immediate to the behavior you want, and add friction to the one you do not.

Shorten the gap. Anything that brings the payoff closer works with the bias instead of against it — which is why weekly targets outperform annual ones for almost everyone. See compounding.