Tracking Debt Payoff in a Spreadsheet: Snowball vs. Avalanche
By Hupp Goods ·
Reddit threads about debt payoff spreadsheets follow a pattern: someone builds a sheet to track their own payoff, shares it, and other people ask how to adapt it for their own list of debts. That comes up regularly across r/personalfinance, r/Debt, and r/Frugal. The spreadsheet part is usually simpler than people expect. The part that actually takes a decision is picking snowball or avalanche, and that choice happens before you open Excel.
Snowball and avalanche are ordering methods, not formulas
Snowball means paying minimums on every debt, then putting any extra money toward the smallest balance first, regardless of interest rate. Avalanche means the same minimums, but the extra goes toward the highest interest rate first. Both are just rules for which debt gets extra money next. Neither one is something a spreadsheet calculates for you. You pick the order, then the spreadsheet's job is to record what happened.
What a debt tracker actually needs to record
Regardless of which method you use, the same handful of columns cover it for each debt:
- Starting balance and current balance
- Interest rate (needed if you're comparing avalanche order, or just want to see it)
- Minimum payment
- Each payment made, with its date and amount
- Remaining balance after that payment
That last column, remaining balance, is the one people ask about most. A row-by-row running balance is the same idea used for tracking any account balance in Excel: this row's balance equals the row above it, minus this payment.
Worked example (illustrative numbers, not a real person's data)
Say a credit card starts at $2,400. Row 1: Payment $150, Balance =2400-150
= $2,250. Row 2: Payment $150, Balance =C1-B2 (previous balance minus this
payment) = $2,100. Copy that formula down and each new payment automatically reduces
from wherever the balance currently sits, no manual subtraction needed each month.
With more than one debt, the same pattern repeats per debt, either as separate tabs or separate row blocks on one sheet. What changes between snowball and avalanche is only which debt you point extra payments at first. The tracking columns don't change.
Where people run into trouble building this themselves
A recurring question on r/excel is how to structure a multi-debt workbook at all, before formulas even come up: separate tables for debts, creditors, and payments, linked so a payment can reference which debt it belongs to. That's a reasonable way to build it, and it's also more structure than most people need for a handful of personal debts. The more common failure mode is simpler: ranges that don't get extended when a new payment row is added, or a running balance formula copied down inconsistently so one row breaks the chain and every balance after it goes wrong.
This is exactly what a prebuilt debt section automates: the running balance formula is already wired correctly, and it stays wired when you add a new payment row because the structure is fixed ahead of time. The Paycheck Bill Tracker includes a debt section that records principal payments against up to 10 debts (200 principal-payment entries total per workbook) and shows the remaining balance for each one. To be direct about what it doesn't do: it does not choose snowball or avalanche for you, calculate an interest-rate comparison, or generate a payoff date. You still decide the order and enter each payment yourself. What it removes is the formula-building and range-extending work, not the decision.
Sources
Reader questions and spreadsheet patterns referenced above came from: r/personalfinance, "Here's my budget/debt tracking spreadsheet", r/Debt, "Snowball Method Spreadsheet", r/Frugal, "Snowball Debt Reduction Calculator Spreadsheet", and r/excel, "How to create a comprehensive workbook for all my debt", accessed September 2026.