Chapter 4: The payoff playbook

Sixteen years and eight months is how long Tasha's $6,800 of card debt would last if she paid only the minimums, and the interest along the way would reach $11,245, more than one and a half times what she actually spent. The same three cards, attacked with the same minimums plus $250 a month, are gone in 24 months for $1,676 of interest. The balances cannot tell those two futures apart. The plan decides, and this chapter builds the plan.

The Finvest Personal Finance Guide covers payoff methods in a single chapter. Here we run the full machinery on real numbers, because the details are where plans live or die: which card goes first, what the minimums do as balances fall, and where the $250 comes from in the first place.

Every debt on one page

You cannot aim at a debt you have not written down. Tasha's first move cost nothing but one evening: every statement open, every app open, every balance copied onto one page. The page held the three cards she knew about, plus the four buy now, pay later (BNPL) plans she had honestly lost track of, each one a small autopay biting her checking account on its own schedule.

Two things jump off the page once the page exists. First, the card minimums total $215 a month, and Chapter 1 explained their design: each one is that month's interest plus 1% of the balance, with a $25 floor, which is why minimums shrink as balances fall and why minimums alone never finish the job. Second, the BNPL plans look harmless at 0%, but together they pull about $220 a month out of checking in eight separate bites, and they are a big reason Tasha felt broke on paydays she could never explain. The good news hides in the same column: every one of those plans ends on its own within six weeks.

Pick an order, not a mood

Once every debt is listed, the strategy question is simply which balance your extra money attacks first.

There is a fourth order, and it is the one that fails reliably: paying whichever balance feels worst this week. It spreads money thin, finishes nothing, and turns guilt into the strategy. Any written order beats it.

Tasha's 24 months, computed exactly

To compare the orders honestly, we ran Tasha's actual cards through the same model the calculator below uses. Every card gets its minimum each month, recalculated as interest plus 1% of the balance with the $25 floor, so the minimums shrink as the balances do. The $250 extra goes to one target card on top of its minimum. When the target hits zero, the $250 moves to the next target. Freed-up minimums are not rolled forward as extra money; they simply stop being owed, which is exactly how minimums behave in real life.

Both orders open the same way, because Tasha's smallest balance, the $1,300 store card, is also her highest rate at 29.9%. The universe handed her one free decision: target number one is the same card under every method, and it dies in month 5.

Then the orders split. Avalanche sends the $250 to the $3,400 card at 26.4% next; it dies in month 17, and the $2,100 card at 22.9% follows in month 24. Snowball goes by size instead, so the $2,100 card dies in month 13 and the $3,400 card closes things out in month 24. Either way, the last balance hits zero in month 24. Total interest comes to $1,676 by avalanche and $1,732 by snowball. The famous method war, fought on Tasha's real numbers, is worth $56 over two years and not a single month of time. Hybrid, for her, is identical to avalanche, since the quick win and the highest rate are the same card.

That result is common. When balances are similar in size and rates sit within a few points of each other, the gap between methods stays small. The gap that is never small is the one between any order and no order:

Your debts are not Tasha's debts. The calculator below runs the exact same model on your balances, your rates, and your extra payment, with both orders side by side:

Finding the $250

A plan without fuel is a wish, so the honest question is where Tasha's $250 comes from on a $52,000 salary, roughly $3,300 a month after taxes. For her it came from three places, and none of them involved suffering for sport.

The first was the BNPL freeze: no new plans, starting today. The four existing plans finish on their own within six weeks, and the roughly $220 a month they were draining comes home. That money is not new income. It was already hers, just spoken for in eight pieces. The second was the gap work from the Personal Finance Guide's cash-flow chapter: two forgotten subscriptions and a delivery-fee habit gave back about $90 a month. The third was a one-weekend sprint, selling an old tablet and a bike that had not moved in two years, which raised $240 and went to the store card the same day as a head start. Sprint money always goes straight to the target, while the $250 is the steady engine.

Her first-month outlay is $215 of minimums plus the $250 attack, $465 in total, and it falls a little every month afterward as the minimums shrink with the balances.

Automate the floor, throw the punch by hand

Automation does two different jobs here, and they deserve different settings. Every minimum goes on autopay with no exceptions, because one missed minimum buys a late fee and can trigger the penalty APR repricing from Chapter 1, which would tax the entire plan. The $250 attack payment stays manual on purpose. Tasha sends it two days after payday, by hand, because the small ritual of aiming the money is part of what keeps the plan alive. The Personal Finance Guide's automation chapter calls this the floor-and-attack split: machines hold the floor so a human can throw the punch.

The month-7 plateau

Every payoff plan has a quiet middle, and the quiet middle is where most plans die. Tasha's month 5 is a celebration: a card is dead. Month 13 or 17 brings the next kill, depending on her order. In between sits month 7, where she owes $4,617, no account has closed recently, and the plan feels like rowing in fog. The balances are in fact falling by about $290 a month at that point, faster than when she started, but nothing about her day announces it.

The fix is to make progress visible on purpose: a paper chart on the fridge with one box per $100 of debt, colored in monthly; the dead card cut up and taped above it; and a two-minute balance check on the same day each month, never daily, since daily checking turns a two-year project into a mood disorder. Motivation in this fight works like a supply line, and supply lines get built.

The triage line

This chapter assumes the minimums fit inside your income with room left over. For some readers they do not, and that is a math condition, not a character flaw. Three signs mark the line: the minimums alone exceed what is left after rent, food, and transport; you are paying debt with new debt, like a cash advance to cover a card bill; or basics are losing to interest, with groceries shrinking so payments can clear. If any of those describe this month, the playbook you need is Chapter 8, which covers hardship programs, nonprofit credit counseling, and the heavier tools, in that order and without judgment. The math got you here, and the math gets you out. Go there first and come back to this chapter when the floor holds.

Where people go wrong

1. Spreading the extra everywhere. Sending $80 to each of three cards feels fair and finishes slowest. Concentrate on one target.
2. Draining the emergency fund to speed up. A $0 buffer plus one flat tire equals new card debt at 26.4%. Keep the starter reserve from the Personal Finance Guide intact while you attack.
3. Financing new BNPL mid-plan. Four plans became zero for a reason. One new "harmless" $30 autopay reopens the leak.
4. Quitting after the first win. Month 5 is the most dangerous month, because relief feels like completion. The chart, the ritual, and the next named target carry you through the plateau.

Key takeaways

• Write every debt on one page first: balances, APRs, and real payments, BNPL included. Tasha found $7,079, not the $6,800 she expected.
• On her actual cards with $250 extra, avalanche finishes in 24 months with $1,676 of interest and snowball in 24 months with $1,732. The order is worth $56; the $250 is worth more than 14 saved years against the minimums-only path of 200 months and $11,245.
• Minimums shrink as balances fall, so automate them as the floor and aim one manual attack payment at a single target.
• Fuel the plan with recovered money: the BNPL freeze, the cash-flow gap, and one-time sprints sent straight to the target.
• If the minimums themselves do not fit, that is the triage line. Chapter 8 exists for exactly that, no shame attached.

Sources: LendingTree, Credit Card Debt Statistics · Bankrate, Current Credit Card Interest Rates · Finvest Personal Finance Guide