My spouse and I recently finished an ove
For reference only. Not investment advice.
Question
My spouse and I recently finished an overhaul of our household cash flow after having our second child. We have three lingering credit card balances accumulated during unpaid parental leave and hospital out-of-pocket bills:
- Store Retail Card: $2,400.00 28.99% APR (minimum monthly payment: $75.00)
- Major Bank Visa: $5,100.00 22.49% APR (minimum monthly payment: $130.00)
- Credit Union Mastercard: $3,800.00 14.25% APR (minimum monthly payment: $95.00)
Total combined debt balance: $11,300.00.
Total required monthly minimum payments: $300.00 / month.
Total non-negotiable monthly debt elimination budget we can sustain: $650.00 / month ($350.00 extra cash flow dedicated above minimums).
My spouse is drawn to the Debt Snowball method (paying off the smallest balance first for quick psychological momentum), whereas I want to follow the Debt Avalanche method (highest interest rate first to minimize total money paid to the banks).
Could you provide:
- Exact Mathematical Comparison Ledger (Avalanche vs. Snowball):
- For Debt Avalanche (Store Card -> Bank Visa -> Credit Union): exact months to total debt freedom, payoff timeline for each specific card, and total cumulative interest paid.
- For Debt Snowball (Store Card -> Credit Union -> Bank Visa): exact months to total debt freedom, payoff timeline for each specific card, and total cumulative interest paid.
- The exact net dollar difference in interest between the two strategies and final payoff tail payments.
- Behavioral vs Financial Trade-off Analysis:
- Notice that the Store Card is both the lowest balance ($2,400) and the highest APR (28.99%), meaning both strategies start on the exact same card! How does the divergence between Card 2 and Card 3 affect motivation vs cost?
- Practical guardrails to prevent reloading paid-off accounts while maintaining momentum over the 21-month journey.
Answer
You're saying housing, utilities, survival medicine, and children's food are already covered (cash-flow overhaul done, second child, parental leave + hospital behind you), so this is a comparison, not a crisis ladder. Running the script with your three cards now.
Housing, utilities, survival medicine, and children's food are covered, so this is a comparison run, not a crisis ladder. Both methods finish in the same 21 months on $650/month — the difference is *where the dollars go* and *when the second card clears*.
Avalanche — Store Card → Bank Visa → Credit Union
| Card | Cleared at month | Interest paid | Final payment |
|---|---|---|---|
| Store Retail Card | 7 | $211.97 | $61.97 |
| Major Bank Visa | 16 | $1,079.03 | $466.00 |
| Credit Union Mastercard | 21 | $741.23 | $332.23 |
| Total | 21 | $2,032.23 | — |
Snowball — Store Card → Credit Union → Bank Visa
| Card | Cleared at month | Interest paid | Final payment |
|---|---|---|---|
| Store Retail Card | 7 | $211.97 | $61.97 |
| Credit Union Mastercard | 14 | $435.82 | $87.79 |
| Major Bank Visa | 21 | $1,583.09 | $530.88 |
| Total | 21 | $2,230.88 | — |
Source: this turn's `payoff.py` ok:true stdout, monthly compounding model (not a prediction).
Net difference
- $198.65 less interest under Avalanche ($2,032.23 vs $2,230.88) — about 1.76% of the $11,300 starting balance.
- Tail payment on the Bank Visa is lighter under Avalanche ($466.00 vs $530.88) because Avalanche attacks it two months sooner and a smaller balance accrues less interest.
Behavioral vs financial trade-off
You called it: the Store Card is both the smallest balance *and* the highest APR, so both methods win their first card at month 7 on the same debt. The real divergence is Card 2.
| Avalanche (Card 2 = Visa) | Snowball (Card 2 = CU MC) | |
|---|---|---|
| Second card cleared | month 16 | month 14 ← two months sooner |
| Final-balance card | Credit Union, $332.23 tail | Bank Visa, $530.88 tail |
| Total interest | $2,032.23 | $2,230.88 |
| "Two down" milestone | later | earlier |
Snowball hands you a visible "2 of 3 gone" moment at month 14 — useful when momentum is what keeps both of you making $650 payments. Avalanche keeps more dollars in your pocket ($198.65) and finishes the Visa two months sooner, which makes the back half of the plan feel lighter.
Both finish at month 21. I won't pick — pick "save $198.65" or "clear a second card by month 14".
Practical guardrails for the 21-month run
- Freeze the Store Card the day it hits $0. It is the highest APR (28.99%) and therefore the highest reload risk. Cut it up or ask the issuer to close the account; do not keep it "for emergencies."
- Rollover rule. On the very next statement after a card is paid off, redirect its minimum payment into the next card on the list. This is what keeps the $650/month total flowing — the moment a freed-up minimum sits idle is the moment the plan slips.
- Zero-new-purchases rule on all three cards for 21 months. If a real emergency hits, use a pre-funded cash buffer, not the cards. New charges on a0%-balance card reset the APR math.
- Visible monthly check-in. Print or screenshot all three balances once a month and put the page on the fridge. The shrinkage is what feeds next month's discipline — this is the snowball argument made literal.
- Pause-and-call rule. If a month's budget falls below $650 (overtime lost, childcare surprise, medical), call the issuers *before* missing a payment. Most will set up a hardship arrangement that protects the credit file and keeps the schedule alive.
- Statement-date anchor. Pay on the same day each month (e.g., the day after payday) so the $650 leaves the account automatically and is not a decision that can be skipped.
If you want, I can save this month's snapshot (`save_snapshot.py`) so next month picks up where this one ends.