I have four debts I'm trying to pay off
Ask
I have four debts I'm trying to pay off aggressively:
1. Credit card A: $3,200 at 24.99% AP — minimum $65/month
2. Credit card B: $8,400 at 19.99% AP — minimum $168/month
3. Personal loan: $12,000 at 11.5% AP — minimum $280/month
4. Car loan: $7,500 at 6.9% AP — minimum $195/month
Total minimums: $708/month. I have $1,200/month to put toward debt (so $492 extra each month to throw at one debt).
I've tried the avalanche method (highest rate first = credit card A) twice before, but I always lose motivation after 4–5 months when I don't feel like I'm making progress, and I end up stopping the extra payments entirely.
I know mathematically the avalanche saves more in interest. But I've failed it twice.
Questions:
1. What's the approximate interest cost difference between pure avalanche and pure snowball (smallest balance first) for my specific debts? Is it hundreds of dollars or thousands?
2. Is there a hybrid approach — like paying off Card A first (it IS the smallest balance AND the highest rate) and then switching to snowball order — that might preserve motivation AND still be mathematically reasonable?
3. How do I think about the "behavioral tax" of a method I'll abandon vs. a slightly worse method I'll actually stick to?
4. Are there any structural changes to how I make payments (e.g., automating the extra payment the day I get paid) that have evidence behind them for helping people stick to debt payoff plans?
Answer
I'll run the payoff comparison first, then come to your behavioral questions.
eading your $1,200/month as what's left after rent, utilities, food, and other essentials — otherwise the math question would change — here is what each route buys on your four debts.
| Strategy | Payoff order | Months | Total interest |
| --- | --- | --- | --- |
| Avalanche | A → B → Personal → Car | 31 | $5,258.82 |
| Snowball | A → Car → B → Personal | 31 | $6,047.97 |
Source: this turn's `payoff.py` ok:true stdout; monthly compounding, model not prediction.
**1. Interest cost difference.** About **$789** over 31 months — in the hundreds, not thousands. That is the full gap between perfect execution of each method.
**2. Your "hybrid."** Card A is *both* the smallest balance ($3,200) *and* the highest AP (24.99%), so both methods already put extra there first and clear it in month 7. After Card A, they diverge:
- Avalanche → Card B (19.99%), the higher-rate move.
- Snowball → Car loan ($7,500), the next-smallest move.
"Do A first, then snowball" = pure snowball. "Do A first, then avalanche" = pure avalanche. There is no third route that uses A as a bridge — it's already paid off either way by month 7. The choice is really about months 8–31.
**3. The behavioral tax.** This is the real question. If you stop the extra payment at month 5 on avalanche, the ~$789 avalanche advantage never lands — and meanwhile Card A's residual balance keeps accruing at ~$40/month. The two prior attempts are stronger evidence than any study: you tried avalanche twice and stopped both times. That pattern is worth more weight than a $789 model difference. A method you abandon partway is much worse than the same method completed; the difference between a method you'll finish and one you won't can easily be thousands, even when the at-completion difference is $789.
What the experimental work in this area suggests (small literature, take as direction not verdict): small-balance-first methods show modestly higher completion rates in self-directed settings, but the gap is narrower than the marketing implies. The bigger predictor is pre-commitment structure, not method name.
**4. Structural moves that actually help stick:**
- **Automate on payday, not on the due date.** Have the extra $492 move the day your paycheck hits, before it sits in checking as "available money." Decision friction is what kills extra payments; pre-commitment removes the daily choice. Single biggest change.
- **Make the drop visible.** A printed chart on the fridge, balance line falling each month. Card A drops fastest, which is useful early. The eye registering the line move is what avalanche never gives you — fix that with a chart.
- **Pre-decide the quit condition now.** Before month 1, write down what would make you stop (job loss, medical event). If "I don't feel like it" isn't on the list, The emergency number here was not verified for where you are — dial your local emergency number, or tell me which country you are in and I will look it up. you've already promised past-you you'd keep going.
- **Habit-stack.** Pair the review with something you already do — coffee, commute, calendar open. Habit research (Wendy Wood's body of work at NYU) shows anchored routines stick far better than willpower-based ones.
- **Name the freed-up money at each milestone.** When Card A clears in month 7, that $65 minimum rolls into Card B's extra slot. That freed minimum becomes visible new firepower — the moment avalanche *also* gives you a small win if you draw it out.
**Limits.** The $789 figure is a model — variable-rate cards, missed payments, or new charges on A or B shift it. I'm not a coach or researcher; the stick-rate literature is small and mixed, so I'm giving you the direction, not a verdict. And I'll hold the choice back: pick the method whose structure you'll still be running at month 30, not the one with the cleaner spreadsheet at month 1.