Short answer: to switch from a spreadsheet to a budgeting app, don’t migrate the spreadsheet; migrate the decisions it held. Freeze the workbook as read-only, move only this month’s income and fixed lines into the app, decide whether to bring in this month’s daily expenses, run one month of comparison against the sheet’s bottom line, then stop opening the file. Most solo budgets move in a weekend afternoon.
This guide is for someone who has a budget spreadsheet that technically works and practically doesn’t. The formulas are fine. The problem is that updating it means sitting down at a laptop, opening the file, finding the right tab, scrolling to the right row and hoping nobody, including you, typed over a total. So it gets updated on Sundays, then every other Sunday, then not until something goes wrong. By the end of this guide you’ll have a step-by-step migration, a checklist of what to move and what to leave, and a rule for when the old file is officially retired.
If you haven’t picked an app yet, start with our comparison of free alternatives to Excel and come back.
Why phone-first wins the upkeep battle
A budget only works if it’s current, and it’s only current if updating it is easier than skipping it. The device in your pocket is the one that’s there when you spend. Pew Research Center’s 2025 mobile fact sheet puts smartphone ownership at 91 percent of US adults. Spreadsheets do run on phones, but entering a $14 lunch into the right row of a tiny grid is exactly the friction that kills the habit.
Even Microsoft gave up on the budget-in-Excel idea as a product: its end-of-support notice for Money in Excel says the bank-linked template stopped updating on June 30, 2023.
Step 1: Audit what the spreadsheet actually does
Open the workbook and list every tab. For each one, write one line: what question does this tab answer? Typical answers:
- “How much is left this month?” (the summary)
- “What are my fixed bills?” (the fixed list)
- “Where did the money go?” (the transaction log)
- “What do I own and owe?” (net worth)
- “Am I on track for the trip?” (a savings goal)
Then mark each tab: used this month, used occasionally, haven’t opened in a year. Only the first group migrates. The second group becomes a yearly review. The third group is already retired; you just haven’t admitted it.
Step 2: Freeze the workbook
Make a copy, name it with the date, for example “Budget archive through Oct 2026”, and set it to read-only or view-only sharing. This is the most important step for your nerves: nothing is lost, and you won’t be tempted to “just update it this once.”
Step 3: Move the fixed lines by hand
Fixed lines are the heart of any budget and the part that changes least: rent or mortgage, utilities, phone, insurance, car payment, loan minimums, subscriptions, childcare, gym. Copy them into the app as fixed expenses with their amounts and due dates. Typing them is faster than any import, and it doubles as a review: each line you type is a chance to ask whether it should still exist.
Check against our monthly budget categories checklist so annual costs like car registration or a renter’s insurance premium don’t fall through the cracks.
Step 4: Enter this month’s income
Enter take-home pay for the current month, not gross salary. If you’re paid every two weeks, enter each paycheck as it lands; if your income varies, enter what has actually arrived so far. In Monthly, income can be added in several pieces and the free-money figure recalculates each time.
Step 5: Decide what to do with this month’s daily expenses
You have two options for the purchases you’ve already made this month:
- Start fresh. Ignore what’s already spent and begin logging from today. Simple, slightly inaccurate for one month.
- Import this month only. In Monthly you can import daily expenses from a CSV with Date, Name, Amount and Currency columns. Dates must be written YYYY-MM-DD, the file can be up to 2 MB and 5,000 rows, and only rows that match the month and currency you’ve selected are imported. Export the current month’s rows from your sheet, rename the columns, and bring them in.
Don’t import previous months. Old transactions don’t change this month’s decisions.
Rename columns before you export
Add a new tab, paste only this month's rows, and set the headers to exactly Date, Name, Amount, Currency. Format the date column as YYYY-MM-DD. It takes two minutes and saves an import that skips every row.
A worked example: a 14-tab workbook becomes 13 entries
All figures are illustrative. A renter’s workbook has 14 tabs: a summary, a fixed list, 12 monthly transaction logs and a “car fund” tab nobody has touched since spring.
The audit shows only two tabs are used every month: the summary and the fixed list. So the migration is:
| What | Entries in the app |
|---|---|
| Take-home pay (two paychecks of $1,975) | 2 |
| Fixed lines: rent $1,425, utilities $160, internet $60, phone $55, car insurance $135, car payment $345, student loan $210, streaming $28, gym $30 | 9 |
| Weekend reserve, $250 | 1 |
| Car fund as a savings goal: $1,500 by June | 1 |
| Total | 13 |
Free money: $3,950 − $2,448 fixed − $250 weekend reserve = $1,252 for groceries, gas and everything else. The sheet’s summary tab showed $1,249; the $3 gap turned out to be a streaming price change the sheet had never caught.
Ten of October’s grocery and gas rows went in through the CSV import. The 12 old logs stayed in the archive.
Step 6: Run one comparison month
For the rest of the month, log every expense in the app only. On the last day, open the frozen spreadsheet once and compare its remainder with the app’s free money. If they’re close, you’re done. If they’re far apart, you’ve almost certainly forgotten a fixed line, which is a useful discovery either way.
Step 7: Set the retirement rule
Write it down: “If I haven’t opened the archive in 60 days, I delete my shortcut to it.” Keep the file; remove the habit. Once a year, export from the app to CSV or Excel for a review workbook if you like charts. That’s the only spreadsheet job left.
The migration in seven moves
- List every tab and the question it answers.
- Freeze the workbook as a dated, read-only archive.
- Type the fixed lines into the app.
- Enter this month's take-home income.
- Start fresh or import only this month's daily expenses.
- Compare bottom lines once at month's end.
- Remove the shortcut after 60 days; keep a yearly export.
Mistakes that drag a migration out
Rebuilding every category from the sheet. Twenty-two categories in a spreadsheet often become eight in practice. Let the app’s structure simplify yours.
Importing history to feel complete. It’s busywork. The archive already holds it.
Waiting for the first of the month. You can start mid-month; the first month is a comparison month anyway.
Keeping net worth in the sheet. Move current balances once. In Monthly, debts, investments and goals sit under Patrimonio and update when you change them.
When to keep the spreadsheet after all
If you model scenarios every month, like comparing loan payoffs or rental options, a spreadsheet is still the better tool for that. Keep it for modeling and use the app for the month. If you’re still unsure, our budgeting app vs. spreadsheet guide walks through the trade-offs with a sample month.
Next step
Pick an afternoon this weekend, freeze the file and type your fixed lines. Open Monthly, add this month’s paychecks and bills, and let the spreadsheet retire on a high note → This is general information, not personalized financial advice.