The most common debt advice is to pay more than the minimum. It is correct but dangerously vague. How much more? On which debt? Starting when? The surplus method answers all three with a specific number derived from your actual income and expenses.
FreeByDate is built around the surplus method. Enter your income, bills, savings, and debts. It calculates your real monthly surplus and sequences your debts showing the exact closing date for every balance.
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The step-by-step plan
1
Calculate your actual monthly surplus
Monthly take-home income minus every fixed recurring bill minus a protected savings contribution minus the minimum payment on every debt. What remains is your surplus.
2
Protect savings before calculating surplus
This step comes before debt calculation. Even $200 per month in protected savings means a $1,200 car repair does not derail a 2-year payoff plan. FreeByDate ring-fences savings first.
3
Choose a sequencing order
Snowball sequences by smallest balance, faster first closure. Avalanche sequences by highest APR, lower total interest. The surplus method works with either order.
4
Concentrate the full surplus on one target
Every dollar of surplus goes to one debt only. Every other debt receives its exact minimum payment. This is the central principle and the step most people skip.
5
Roll freed payments forward without exception
When a debt closes its minimum payment adds immediately to your surplus for the next target. Your effective surplus grows with every closure.
Why "pay extra" is the wrong instruction
When people are told to pay extra, the usual result is $50 extra on three different cards simultaneously. At 22% APR on a $5,000 balance an extra $50 per month across three cards makes almost no visible progress on any of them. Concentrating $150 on one balance closes it meaningfully faster.
The surplus method does not ask you to find extra money. It asks you to concentrate the money you are already paying more precisely. That distinction is what changes the outcome.
How surplus differs from traditional snowball and avalanche
Traditional snowball and avalanche calculators ask for a fixed extra payment, say $200 per month. Most people do not have a stable consistent $200 available every month. Their actual available cash fluctuates and the entered amount is often optimistic.
The surplus method starts from the other direction. It calculates the surplus mathematically from real income and real expenses. The resulting number is your actual available cash, not an aspiration, which means the closing dates are dates you can actually rely on.
Worked example, your numbers in action
Your scenario, worked example
Credit card A
$5,800
23.99% APR
Credit card B
$3,200
19.99% APR
Personal loan
$8,500
14.99% APR
Snowball method
13 months
to debt free · $2,480 in interest
Order: Card B then Card A then Personal loan
Avalanche method
12 months
to debt free · $2,190 in interest
Order: Card A then Card B then Personal loan
Snowball vs Avalanche, full comparison
Both methods work with the surplus sequencing approach. The difference is in what you optimise for.
| Factor | Snowball | Avalanche |
|---|
| Total months | 13 months | 12 months Wins |
| Total interest | $2,480 | $2,190 Wins |
| Monthly surplus used | $2,070 | $2,070 |
| vs min payments | 7+ years saved | 7+ years saved |
| vs spreading payments | 4 months faster | 5 months faster Wins |
Calculate your real surplus and see every closing date
Enter your income, bills, savings, and debts. FreeByDate calculates your actual monthly surplus and shows the exact closing date for every debt.
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Frequently asked questions
What is the debt payoff surplus method?
The surplus method calculates your real monthly cash after all bills and a protected savings contribution then concentrates the entire amount on one debt at a time. When each debt closes the freed payment rolls to the next target.
How is the surplus method different from snowball and avalanche?
Snowball and avalanche describe the order in which you attack debts. The surplus method describes how much to attack with. It is compatible with both, you choose snowball or avalanche as your ordering and the full calculated surplus executes that order.
What if my surplus is very small?
The surplus method works at any surplus size. Even $200 per month concentrated on your smallest balance closes it faster than spreading across three cards. The timeline is longer on a small surplus but the method is identical.
Does FreeByDate use the surplus method?
Yes, this is the core mechanism. FreeByDate subtracts bills and savings from income to calculate your real monthly surplus then sequences your debts and shows the closing date for every balance.