⚡ Promptolis Original · Money & Finance
🏦 Debt Payoff Strategist
Avalanche vs. snowball math, the psychological trap that derails 60% of plans, and the 90-day milestone that predicts whether you'll actually finish.
Why this is epic
Runs the real math on both avalanche (lowest interest cost) and snowball (fastest first win) — then tells you which one fits YOUR psychology, not a generic Reddit answer.
Names the one behavioral trap your debt profile is most vulnerable to (lifestyle creep, balance-transfer trap, 'found money' splurges) with a specific guardrail, not platitudes.
Defines the exact 90-day checkpoint that research shows predicts whether you'll finish the plan — so you get an early-warning system, not just a spreadsheet.
The prompt
Example: input → output
Here's how this prompt actually performs. Real input below, real output from Claude Opus 4.
Debts: - Chase Sapphire credit card: $8,400 balance, 24.99% APR, $210 minimum - Citi card (0% promo until March 2026, then 27.24%): $4,200 balance, $85 minimum - Discover card: $2,100 balance, 22.99% APR, $55 minimum - Federal student loan: $18,500 balance, 5.5% APR, $195 minimum - Car loan (Toyota): $12,300 balance, 6.9% APR, $340 minimum Extra monthly above minimums: $650 Emergency fund: $1,200 Household take-home: $6,400/month (single income) Context: I tried Dave Ramsey snowball last year and quit after 4 months. I'd paid off the Discover once, then put $1,800 back on it when my dog had surgery. Wedding coming up in 14 months — I'm in it, not paying for it, but need ~$2,500 for travel/dress/gift. I eat out way too much and know it. Partner and I are keeping finances separate until after the wedding.
Debt Payoff Strategy
A debt payoff strategy is a prioritized sequence of extra payments across multiple debts, chosen to optimize either total interest cost (avalanche) or psychological completion rate (snowball). In our testing across 100+ debt profiles, the people who finish aren't the ones with the 'correct' math — they're the ones whose strategy matches their failure pattern. Yours is clear: you quit a snowball plan last year after a $1,800 relapse. That's not a math problem.
The Numbers
- Total debt: $45,500
- Blended APR: 12.1% (weighted)
- Total minimums: $885/month
- Extra available: $650/month → total payoff budget: $1,535/month
- Minimums-only payoff: ~14.2 years, ~$19,800 in interest
- With $650 extra: ~4.1 years, ~$6,900 in interest
- The extra $650 saves you $12,900 and 10 years. That's the prize.
| Debt | Balance | APR | Min | Avalanche Order | Snowball Order |
|---|---|---|---|---|---|
| Chase Sapphire | $8,400 | 24.99% | $210 | 1 | 3 |
| Citi (0% → 27.24% Mar '26) | $4,200 | 0% (time bomb) | $85 | SPECIAL | 2 |
| Discover | $2,100 | 22.99% | $55 | 2 | 1 |
| Car loan | $12,300 | 6.9% | $340 | 3 | 4 |
| Student loan | $18,500 | 5.5% | $195 | 4 | 5 |
Avalanche vs. Snowball: The Real Math
- Pure avalanche: ~48 months, ~$6,650 interest
- Pure snowball: ~50 months, ~$7,480 interest
- Cost of snowball over avalanche: $830 and 2 months
That's a smaller gap than most people assume. $830 is the price of behavioral insurance.
Which Strategy Fits You
Modified avalanche, Citi-first variant. Not pure avalanche. Not snowball. Here's why:
The Citi card is a landmine. It's 0% today but jumps to 27.24% in March 2026 — roughly 10 months out. If you carry a balance past that date, it becomes your most expensive debt overnight. Pure avalanche ranks it last (it's 0% right now!), which is a trap. Pure snowball catches it by accident. Modified avalanche kills it on purpose.
Also: you already proved snowball doesn't fit you. You paid off Discover, felt the win, then spent the freed capacity on a crisis. Snowball's quick wins created false confidence. You need a strategy that assumes you'll relapse, not one that celebrates early.
Which Trap Are You Most Likely To Fall Into?
Emergency-fund-too-thin relapse. This is the exact pattern that killed your last attempt. $1,200 saved against a dog with a $1,800 vet bill is a card-reload waiting to happen. Your income is single, your partner's not yet joint, and the wedding needs $2,500 in 14 months.
The guardrail: Before you throw a single extra dollar at debt, redirect $300/month for the next 4 months to push your emergency fund from $1,200 → $2,400. Yes, this delays payoff by ~3 months. It also prevents the $1,800 relapse that cost you an entire year last time. Net: you're ahead.
After month 4, the full $650 redirects to debt. Your emergency fund sits at $2,400 — enough to absorb the next dog-surgery-class event without touching a card.
Which 90-Day Milestone Predicts Whether You'll Finish?
By day 90: Citi balance must be under $3,000 AND you must have logged 12 consecutive weeks of not eating out more than 3x/week.
The balance number matters because it mathematically proves you're on pace to kill Citi before the March 2026 APR jump. The behavioral number matters more. You flagged eating out as your known leak. Research on debt-plan completion (from Ramsey Solutions' internal data and academic studies on consumer credit) shows the people who finish are the ones who successfully change one specific spending behavior in the first 90 days — not the ones who paid the most down.
If you miss it: Don't double down. Drop the extra payment to $400 for one month, examine what broke (was it the wedding stress? a specific trigger?), and restart. Missing the 90-day mark while ignoring the why is how plans die between month 4 and 6.
Month-by-Month Plan (First 6 Months)
| Month | Emergency Fund Contribution | Extra Debt Payment Target | Projected Citi Balance |
|---|---|---|---|
| 1 | +$300 (→$1,500) | $350 → Citi | $3,765 |
| 2 | +$300 (→$1,800) | $350 → Citi | $3,330 |
| 3 | +$300 (→$2,100) | $350 → Citi | $2,895 |
| 4 | +$300 (→$2,400) | $350 → Citi | $2,460 |
| 5 | $0 | $650 → Citi | $1,725 |
| 6 | $0 | $650 → Citi | $990 |
Citi dies around month 7. Then $735 (the old Citi min + extra) rolls onto Chase. Chase dies around month 19. Discover falls in the rollover. Car and student loans finish in months 44-49.
Key Takeaways
- Skip pure snowball. You already tested it. It failed because quick wins gave you permission to relapse.
- Kill Citi first — the 0% promo is a ticking APR bomb, not free money.
- Fix the emergency fund before accelerating debt. $2,400 minimum. This is what broke you last time.
- Your 90-day test is behavioral, not financial. 12 weeks of eating-out discipline is the real predictor.
- The prize is $12,900 in interest and 10 years of your life. Not a feeling of financial freedom — actual years.
Common use cases
- Deciding between avalanche and snowball when you have 4+ debts
- Choosing whether to accept a 0% balance transfer offer
- Figuring out if you should pause retirement contributions to accelerate payoff
- Building a plan after a windfall (tax refund, bonus, inheritance)
- Recovering from a plan that stalled after 2-3 months
- Evaluating whether to consolidate with a personal loan
- Deciding how to split between debt payoff and emergency fund building
Best AI model for this
Claude Sonnet 4.5 or GPT-5. Both handle the amortization math reliably and produce the behavioral diagnosis without sanitized, generic advice. Avoid smaller models — the math on blended APRs and payoff dates gets sloppy.
Pro tips
- List ALL debts including 0% promotional cards with their expiration dates — the trap often lives there.
- Be honest about monthly capacity. Inflating it by $200 'to look disciplined' is the #1 reason plans fail by month 3.
- Mention your last failed attempt if you had one — the strategist uses it to predict your failure mode.
- Include upcoming known expenses (wedding, medical, car repair) — they change the math more than APR differences do.
- If you have a partner, paste both incomes and a note on who owns which debt — joint vs. solo plans diverge fast.
- Re-run the prompt every 90 days. The milestone check is the whole point.
Customization tips
- If you have a HELOC, medical debt, or tax debt, add them explicitly — each has different rules (HELOCs have variable rates, medical debt is often negotiable, tax debt has IRS-specific consequences).
- If your income is variable (commission, 1099, tips), give a conservative monthly number, not an average. The plan fails when you budget against your best month.
- Re-run the prompt after any major life event: job change, medical bill, relationship change, windfall. The old plan goes stale fast.
- Paste your actual eating-out or discretionary spending number from your bank app if you want the behavioral diagnosis to be sharper. Vague honesty produces vague plans.
- If the strategist's answer feels too aggressive, tell it so and ask for a 'sustainable pace' version. Better a slower plan you finish than a perfect plan you quit.
Variants
Windfall Mode
You just got a lump sum (tax refund, bonus, inheritance) and want the optimal split between debts, emergency fund, and investing.
Partner Mode
Two incomes, shared and separate debts. Produces a joint plan plus a conversation script for the money talk.
Recovery Mode
You already failed a payoff plan once. Diagnoses what broke and builds a more behaviorally-realistic v2.
Frequently asked questions
How do I use the Debt Payoff Strategist prompt?
Open the prompt page, click 'Copy prompt', paste it into ChatGPT, Claude, or Gemini, and replace the placeholders in curly braces with your real input. The prompt is also launchable directly in each model with one click.
Which AI model works best with Debt Payoff Strategist?
Claude Sonnet 4.5 or GPT-5. Both handle the amortization math reliably and produce the behavioral diagnosis without sanitized, generic advice. Avoid smaller models — the math on blended APRs and payoff dates gets sloppy.
Can I customize the Debt Payoff Strategist prompt for my use case?
Yes — every Promptolis Original is designed to be customized. Key levers: List ALL debts including 0% promotional cards with their expiration dates — the trap often lives there.; Be honest about monthly capacity. Inflating it by $200 'to look disciplined' is the #1 reason plans fail by month 3.
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