Debt Snowball Tool · Calculator case study

How to Pay Off $15,000 in Debt in 1 Year

Yes — but only if you can free up $1,200 above the minimums, which means $1,600 a month against the balance on the four-card example below. At that payment both methods finish in 12 months, and avalanche pays $242.73 less in interest. The number that actually decides whether this works is the other one: pay the $400 in minimums only and the same $15,000 takes 81 months and costs $11,271.94 in interest.

Monthly payment needed
$1,600
$1,200 above the $400 in minimums
Months to debt-free
12
both snowball and avalanche
Total interest (snowball)
$1,751
first card gone at month 2
Total interest (avalanche)
$1,509
first card gone at month 5 — $243 less

Numbers from this site's public API on a 4-card $15,000 portfolio at 17-24% APR. Open the calculator with your own balances and rates and the same numbers come out in real time.

The example portfolio

"Can I pay off $15,000 in a year" depends entirely on how the balance is split, so here is the exact split behind every number on this page. Four US credit cards, with a deliberate mismatch: the smallest card is also the cheapest, and the largest card is the most expensive. That is the worst case for the snowball method and the best case for avalanche, so if avalanche only wins by $243 here, it is not going to win by much on your stack either.

CardBalanceMin paymentAPR
Card A$6,000$15024%
Card B$4,000$10021%
Card C$3,000$8019%
Card D$2,000$7017%
Total$15,000$400—

What minimums-only actually costs on $15,000

Sending $400 a month — the minimums, nothing more — clears this portfolio in 81 months on both methods, which is nearly seven years. Interest comes to $11,271.94 on snowball and $11,243.13 on avalanche. You repay the $15,000 and then pay another 75% of it again in interest.

So the honest framing is not "I need $1,600 a month." It is "the gap between doing nothing extra and doing the one-year plan is $9,520.52 in interest and 69 months." Compare that with the $242.73 that choosing avalanche over snowball saves you, and the priority ordering writes itself: the payment size is worth about 39 times more than the method.

Where snowball actually wins, and it is not on money

At $1,600 a month both methods finish at month 12 and avalanche costs $242.73 less. That is the whole financial argument, and avalanche wins it. But look at what happens in the first four months, because this is the part the "avalanche is mathematically optimal" crowd leaves out.

MonthSnowballAvalanche
2Card D cleared ($2,000, 17%)—
4Card C cleared ($3,000, 19%)—
5—Card A cleared ($6,000, 24%)
8Card B cleared ($4,000, 21%)Card B cleared ($4,000, 21%)
10—Card C cleared ($3,000, 19%)
12Card A cleared ($6,000, 24%)Card D cleared ($2,000, 17%)

Snowball has a card gone at month 2 and two cards gone by month 4. Avalanche's first card does not die until month 5, and at month 4 it still has all four open. If you are the kind of person who quits a plan in month three because nothing has visibly changed, that three-month head start is worth more to you than $242.73 — and the calculator will not price it for you, because it is not a number, it is a behaviour.

What avalanche gives you instead is a lower remaining balance every single month from month 2 onward. The gap between the two curves widens steadily and peaks at about $504 around month 10, then closes to zero at month 12. That wedge is the $242.73.

Line chart: remaining balance by month on a four-card $15,000 portfolio paid at $1,600 a month. Both the snowball and avalanche lines start at $15,000 and reach zero at month 12; avalanche runs lower from month 2 onward, with the gap peaking near $504 around month 10.
Both lines start at $15,000 and hit zero at month 12. Avalanche (dashed) drops below snowball (solid) from month 2 onward, and the gap widens to about $504 around month 10 before closing again. The area between the two lines across the year is the $242.73 difference in interest. Drawn from the same API run as the tables above.

What if you can't free up $1,200 a month?

Then this becomes a 17-month, a 21-month or a 30-month plan, and all three are still far better than 81 months. The curve is steepest at the bottom: the first $200 above minimums cuts 34 months off the timeline. The last $50 before the one-year mark cuts one month.

Total monthlyMonths (snowball)Months (avalanche)Interest (snowball)Interest (avalanche)
$400 (minimums)8181$11,271.94$11,243.13
$6004739$6,554.00$5,046.27
$8003027$4,194.28$3,405.25
$1,0002120$3,065.95$2,573.76
$1,2001716$2,445.40$2,073.32
$1,4001413$2,042.93$1,737.11
$1,5001312$1,881.83$1,604.99
$1,5501212$1,805.77$1,561.07
$1,6001212$1,751.42$1,508.69
$1,6501211$1,692.95$1,457.23
$1,8001010$1,528.78$1,326.36

Note what happens at $600 a month: the methods stop agreeing at all. Snowball takes 47 months, avalanche takes 39 — an eight-month gap worth $1,507.73. That is the single largest method gap on this table, six times bigger than the $242.73 gap at the one-year payment. The method matters most when you are paying meaningfully more than the minimum but nowhere near enough to finish quickly. At the one-year payment the two methods converge; in the middle they diverge hard.

How to actually free up $1,200 extra each month

Be honest about the size of this. $1,200 a month is $14,400 across the year. At $20 an hour after tax that is roughly 720 hours, or about 14 extra hours a week for 52 weeks — which is a second part-time job, not a side hustle. Almost nobody clears $15,000 in twelve months on overtime alone. The people who manage it stack three or four sources, usually weighted toward the top of this list:

Two cautions. First, none of this works if new charges keep landing on the cards; a one-year plan assumes the balance only moves in one direction. Second, if your APRs run higher than the 17-24% range used here — store cards often sit at 29% or more — every month figure above gets longer and every interest figure gets bigger. Rerun it with your real numbers instead of borrowing these.

Run your own numbers

Everything on this page came out of this site's API, so you can reproduce it or change it. The endpoint takes your cards and the extra you can pay:

POST https://debtsnowballtool.com/api/payoff
{
  "debts": [
    {"name":"Card A","balance":6000,"apr":24,"minPayment":150},
    {"name":"Card B","balance":4000,"apr":21,"minPayment":100},
    {"name":"Card C","balance":3000,"apr":19,"minPayment":80},
    {"name":"Card D","balance":2000,"apr":17,"minPayment":70}
  ],
  "extra": 1200
}

Two things that trip people up: APR goes in as a percentage (24, not 0.24), and extra is the amount above your total minimums, not your total payment. Or just open the calculator and type your balances in — same engine, no payload.

The same analysis exists at $10K, $20K and $30K. Short answers to the most common payoff questions are in the payoff questions hub.

Frequently asked questions

Can you pay off $15,000 in debt in 1 year?

Yes. With four cards totalling $15,000 at 17% to 24% APR, paying $1,600 a month clears the balance in 12 months on both the snowball and the avalanche method. Interest comes to $1,508.69 on avalanche and $1,751.42 on snowball.

How much do I have to pay each month to clear $15,000 in a year?

$1,600 a month total on the example portfolio. That is $1,200 on top of the $400 in minimum payments across the four cards. At $1,550 a month both methods still land on 12 months; at $1,500 snowball takes 13 months.

What happens if I only pay the minimums on $15,000?

On the four-card example it takes 81 months, which is nearly seven years, and costs $11,271.94 in interest on the snowball method. That is 75% of the original balance paid again in interest alone.

Is it better to use the snowball or avalanche method on $15,000?

Avalanche is cheaper by $242.73 over the 12 months. Snowball is not worse at everything: it clears its first card at month 2 versus avalanche's month 5, and has two cards gone by month 4 versus avalanche's zero. If an early visible win is what keeps you on the plan, snowball's head start is worth more than $243 to you.

Should I use a 0% balance transfer to pay off $15,000 faster?

Only if you can move most of the balance and clear it inside the promotional window. The transfer fee usually runs 3% to 5%, which is $450 to $750 on $15,000 — roughly double the method gap. Run both scenarios in the calculator before you apply.

Do I need to stop using the cards while paying them off?

Yes. Every number on this page assumes zero new charges. If you keep spending on the cards, the balances stop shrinking no matter how much extra you send. A common trick is to remove the cards from your mobile wallet and freeze the physical cards so using one takes effort.

How many hours of overtime would it take to clear $15,000 in a year?

You need $1,200 a month above minimums, which is $14,400 across the year. At $20 an hour after tax that is roughly 720 hours, or about 14 extra hours a week for 52 weeks — which is why most people at this balance size combine overtime with a one-off asset sale rather than relying on hours alone.