Debt Payoff Strategies: Debt Snowball vs. Debt Avalanche

 Debt Payoff Strategies: Snowball vs. Avalanche

When you have more than one debt, the question is not only how much you owe, but also which debt you should focus on first.

Two repayment strategies discussed as per research are the Debt Snowball and Debt Avalanche. They use different rules to decide where extra repayment money goes.

The Debt Snowball starts with the smallest balance, while the Debt Avalanche starts with the highest interest rate. The research also examines how motivation, simplicity, cost, and the effort required to maintain a repayment strategy can affect its performance.

What Is the Debt Snowball Method?

The Debt Snowball method organizes debts from the smallest balance to the largest balance. The borrower continues making the minimum payments on the other debts while putting available extra money toward the smallest debt. Once that debt is completely paid, the payment that had been going toward it is added to the payment for the next-smallest debt. (Ramsey, 2009a; Ramsey, 2009b)

The key feature of Snowball is that balance size determines the repayment order, rather than interest rate. If two debts have the same balance, the source states that the debt with the higher interest rate should be placed first. (Ramsey, 2009b)

How the Debt Snowball Works

1. Arrange the debts from the smallest balance to the largest.
2. Continue making the required minimum payments on the other debts.
3. Direct any available extra repayment money toward the smallest debt.
4. Once the smallest debt is paid off, take the payment previously assigned to it and apply that amount to the next-smallest debt.
5. Repeat the process as each debt is eliminated. (Ramsey, 2009a; Ramsey, 2009b)

Why Does the Debt Snowball Focus on Small Balances?

The reasoning behind Snowball is not purely mathematical. The research discussed in the provided documents points to a psychological and motivational component.

Paying off a smaller debt can provide a visible sense of progress. These smaller victories may encourage borrowers to continue making repayments. The psychological effect of paying off smaller balances is discussed in the research by Amar et al. (2011), Elmblad (2018), and Gathergood et al. (2017).

Research from Northwestern University's Kellogg School of Management found that consumers who focused on smaller balances were more likely to eliminate their overall debt than consumers who attempted to tackle debts with the highest interest rates first. (Boyer, 2012)

The provided research also discusses repayment behavior in relation to account balances. Gathergood et al. (2017) found that a balance-matching model captured more than 50% of the predictable variation in repayment behavior, with account balances showing a stronger correlation with repayment behavior than interest rates. (Gathergood et al., 2017)

Research discussed from Harvard Business Review also described the approach as straightforward and easy to communicate and apply. (Trudel, 2016)

What Are the Limitations of the Debt Snowball?

The main difference between Snowball and Avalanche also creates one of Snowball's main limitations.

Because Snowball prioritizes balance size instead of interest rate, a borrower may continue paying a smaller debt while interest continues accumulating on a larger debt. (Berger, 2017)

The newer research provides an additional qualification. Snowball does not consistently produce the greatest savings across every type of debt. In the documented examples involving traditional debts, Snowball generally produced lower savings than Avalanche. For certain non-traditional debts, however, Snowball produced greater savings than Avalanche. (Lorenzo, 2025)

There is also an execution requirement. Snowball is a sustained repayment strategy, meaning payments must be adjusted as debts are eliminated. The borrower may need to recalculate payment amounts and redirect the payment from one debt to another. (Lorenzo, 2025)

What Is the Debt Avalanche Method?

The Debt Avalanche, also known as debt stacking, takes a different approach.

Instead of looking at the size of each balance, Avalanche ranks debts according to their interest rates, beginning with the highest rate and moving toward the lowest. Extra repayment money is directed toward the debt carrying the highest interest rate. (Kagan, 2018). 

The other debts continue receiving their minimum payments while the targeted debt receives the additional repayment amount. Once the highest-interest debt has been paid off, the payment is redirected toward the next-highest-interest debt. (Kagan, 2018)

How the Debt Avalanche Works

1. Rank debts from the highest interest rate to the lowest.
2. Continue making minimum payments on the other debts.
3. Put the remaining repayment money toward the debt with the highest interest rate.
4. After that debt is paid off, redirect its payment toward the next-highest-interest debt.
5. Continue until the debts have been paid. (Kagan, 2018)The purpose of this repayment order is to direct additional money toward the debt generating the highest interest. (Kagan, 2018)

Why Can Debt Avalanche Be Financially Efficient?

The Practical Debt Management research explains that Avalanche produces low costs for traditional debts because excess money is directed toward the highest-interest loan. The strategy attempts to minimize the total cost of the debts over their collective lifetime. (Lorenzo, 2025)

What Are the Limitations of the Debt Avalanche?

The research does not present Avalanche as a strategy that produces the lowest cost in every possible debt portfolio.

For some non-traditional debts, Avalanche can produce higher costs than Snowball. One reason discussed in the research is that Avalanche does not account for certain characteristics of these debts, including forgiveness eligibility. (Lorenzo, 2025)

There can also be a psychological difference between the two approaches. When the highest-interest debt has a large balance, the borrower may spend a significant amount of time paying it down without experiencing the satisfaction of completely removing a debt from the list. (Pant, 2018)

Avalanche also requires ongoing execution. Interest rates may need to be monitored, and payment amounts may need to be recalculated and changed as debts are eliminated. (Lorenzo, 2025)

Traditional vs. Non-Traditional Debt

One of the most important findings in the newer research is that the characteristics of the debt itself matter.

The study defines a traditional debt as one with a fixed interest rate, no outstanding interest, and no forgiveness eligibility. (Lorenzo, 2025)

A non-traditional debt may have a varying interest rate, outstanding interest that may or may not capitalize, or forgiveness eligibility. (Lorenzo, 2025). The performance study also works with debts that are described as predictable and independent.

A predictable debt has relevant properties—such as remaining principal, interest rate, minimum payment, outstanding interest, forgiveness time, and capitalization time—that are known in advance. An independent debt is one whose properties can be accessed separately and toward which specific payment amounts can be directed. (Lorenzo, 2025)

The assumptions used in the research cover many common debt types but exclude certain variable-rate loans, some revolving credit accounts, and some income-based or graduated repayment plans where relevant rates, balances, or minimum payments are not known in advance. (Lorenzo, 2025)

Why Does the Type of Debt Matter?

The distinction between traditional and non-traditional debt helps explain why the two repayment strategies can produce different results.

In one example involving two forgiveness-eligible debts, both Avalanche and Snowball produced a cost of $23,400, while making only minimum payments resulted in a cost of $20,800. Both repayment strategies therefore produced −$2,600 in savings. (Lorenzo, 2025)

The research explains that the strategies did not account for the possibility of loan forgiveness. As a result, additional payments could be directed toward debts that would eventually be forgiven. (Lorenzo, 2025)

Another example involved eight highly non-traditional debts containing combinations of outstanding interest, capitalization, and forgiveness.

With a total monthly payment of $4,000, the results were:

• Avalanche: $62,818 in savings
• Snowball: $74,128 in savings

(Lorenzo, 2025)

In this scenario, Snowball produced greater savings than Avalanche.

When the monthly payment for the same example was increased to $4,500, the results changed:

• Avalanche: $71,476 in savings
• Snowball: $50,030 in savings

(Lorenzo, 2025)

These examples show that the performance of Snowball and Avalanche can change according to the structure and characteristics of the debt portfolio.

Four Characteristics of an Ideal Debt Repayment Strategy

The Practical Debt Management paper evaluates repayment strategies using four characteristics: optimality, motivation, simplicity, and comparability. (Lorenzo, 2025)

1. Optimality

A repayment strategy meets the optimality criterion when it minimizes the total cost of the debts over their collective lifetime. (Lorenzo, 2025)

2. Motivation

A strategy should encourage borrowers to continue making payments, allowing them to continue saving money on interest charges. (Lorenzo, 2025)

3. Simplicity

A repayment strategy should be easy to execute. The research notes that a strategy that is unclear, difficult, or inconvenient may be executed incorrectly and can result in unexpected interest charges. (Lorenzo, 2025)

4. Comparability

The strategy should be possible to compare with other investment opportunities using financial measures such as return on investment (ROI) or rate of return (ROR). (Lorenzo, 2025)

Snowball and Avalanche: Motivation, Simplicity, and Execution

Snowball and Avalanche share an important characteristic: both are sustained repayment strategies.This means the process does not simply stop after the initial repayment order has been established. As individual debts are paid off, the borrower has to redirect payments toward other debts. (Lorenzo, 2025)

With Snowball, payments are shifted as smaller debts are eliminated, and calculations may be required before changing payment amounts. (Lorenzo, 2025)

Avalanche requires similar payment adjustments, but its interest-rate-based structure also means that interest rates need to be monitored when they change. (Lorenzo, 2025)

The performance research measures this execution effort by counting the number of times borrowers must manually recalculate and change payment values. It treats savings as an indicator of theoretical performance and effort as an indication of how likely a strategy is to be executed perfectly in practice. (Lorenzo, 2025)

What Do the Performance Examples Show?

The documented examples provide a useful comparison between the two approaches.

For three traditional debts, Avalanche produced $10,391 in savings, compared with $8,772 for Snowball. Both required four manual changes. (Lorenzo, 2025)

For six traditional debts, Avalanche produced $20,119 in savings, compared with $18,081 for Snowball. Both required ten manual changes. (Lorenzo, 2025)

For twelve traditional debts, Avalanche produced $192,812 in savings, compared with $182,070 for Snowball. Avalanche required 21 manual changes, while Snowball required 22. (Lorenzo, 2025)

The non-traditional example produced a different outcome. With eight highly non-traditional debts and a $4,000 monthly payment, Snowball generated $74,128 in savings, compared with $62,818 for Avalanche. (Lorenzo, 2025)

At a $4,500 monthly payment, the result changed again, with Avalanche generating $71,476 in savings and Snowball generating $50,030. (Lorenzo, 2025)

EPSILON in the Source Comparison

The provided research also compares Snowball and Avalanche with a third repayment strategy called EPSILON.

EPSILON uses fixed payment values calculated to minimize debt costs. After the initial setup, it is designed to operate without ongoing payment adjustments. (Lorenzo, 2025)In the three-debt example, EPSILON produced $9,627 in savings with zero manual changes, compared with $10,391 for Avalanche and $8,772 for Snowball. Avalanche and Snowball each required four manual changes. (Lorenzo, 2025)

The Practical Debt Management paper evaluates the three strategies against the four criteria of optimality, motivation, simplicity, and comparability. In that evaluation, EPSILON is the only strategy identified as satisfying all four criteria. (Lorenzo, 2025)

EPSILON is included here because it forms part of the direct comparison presented in the provided research.

Snowball vs. Avalanche: The Main Findings

So, what does the research show about debt snowball vs. highest interest?

The Snowball method places the smallest debt first. Its approach is closely connected with the psychological effect of achieving smaller, visible repayment milestones. Research cited in the documents links smaller-balance repayment with repayment behavior and motivation. (Amar et al., 2011; Boyer, 2012; Gathergood et al., 2017)

The Avalanche method places the highest-interest debt first. Its purpose is to direct additional repayment money toward the debt carrying the highest interest rate. (Kagan, 2018)In the traditional-debt examples provided by the 2025 performance research, Avalanche produced greater savings than Snowball. (Lorenzo, 2025)

The non-traditional examples were not as consistent. In one documented scenario, Snowball produced greater savings than Avalanche, while changing the monthly payment in that same scenario produced a different result. (Lorenzo, 2025)

The research therefore does not support treating the two repayment strategies as producing an identical outcome across every debt structure.

Final Thoughts: Debt Snowball or Debt Avalanche?

The difference between the two strategies can be reduced to their repayment priorities:

Debt Snowball → smallest balance first → focuses on visible progress and motivation. (Ramsey, 2009a; Ramsey, 2009b; Amar et al., 2011; Boyer, 2012)

Debt Avalanche → highest interest rate first → focuses on directing extra repayment money toward the highest-interest debt. (Kagan, 2018)

The provided research shows that traditional and non-traditional debts can behave differently, and the documented performance examples do not produce the same result in every situation. (Lorenzo, 2025)

The research also evaluates repayment strategies through four broader characteristics: optimality, motivation, simplicity, and comparability, while recognizing that the way a strategy is actually executed can affect its practical performance. (Lorenzo, 2025)

For that reason, the central comparison in the research is not simply smallest debt versus highest interest. It also considers the type of debt, the cost of repayment, the motivational element, the simplicity of the strategy, and the effort required to execute it accurately.