Direct unexpected income entirely to the targeted debt

Pre-decide that any windfall — bonus, tax refund, gift — goes to the targeted debt before it can be absorbed into spending.

Why it works

Windfall income is treated differently from earned income in behavioral terms: because it was not expected, it does not feel "spoken for" and is more likely to be spent on discretionary purchases rather than debt reduction. Pre-committing the decision eliminates the in-the-moment negotiation about whether the windfall "deserves" a different use. The pre-commitment is most effective when made before the windfall arrives, not at the moment of receiving it.

How to do it

1. Write a standing rule today: "When I receive unexpected income above $X, 100% goes to [targeted debt name]."
2. Tell one other person about the rule so there is social accountability.
3. When a windfall arrives, transfer the amount to the debt within 48 hours — before it sits long enough to attract alternative uses.
4. Note the acceleration effect in your payoff projections so the impact is visible and motivating.

Evidence

Mental accounting research shows that windfall income is more likely to be spent than earned income; pre-commitment to a savings or debt-repayment use before the windfall arrives is associated with higher follow-through than deciding at receipt. (observational)

Mental accounting and windfall spending are observational findings; the specific pre-commitment protocol for windfalls has not been isolated in controlled trials.

Sources

• Thaler (1999), mental accounting matters, Journal of Behavioral Decision Making

Common mistake

Deciding at the moment the windfall arrives rather than in advance — in-the-moment decisions about money are reliably worse than pre-committed ones because the money has not yet arrived to compete with other desires.