To create a monthly budget, list the income you expect, record the commitments it needs to cover, set aside any planned reserves, then check what remains and when payments are due. The first version does not have to be perfect. It needs to be understandable enough that you can correct it.
This guide is written by the Monthly team. It explains a general planning process and how to use our app as one possible tool, not personalised financial advice. The numerical examples are invented for illustration, not recommended spending levels or typical living costs.
1. Define the month and separate income from estimates
Choose one calendar month. Record the take-home amounts you expect to receive during that period, rather than mixing an annual salary with monthly bills. Add a note where an amount or payment date is uncertain.
A freelancer might have one invoice already paid and another awaiting payment. Both can be relevant to planning, but they are not equally certain. Keeping them distinguishable makes it easier to understand why the plan changes if the second payment arrives later than expected.
Do not count a transfer between your own accounts as new income. Moving the same money from one account to another does not increase the amount available for the month. If you include money carried over from a previous period, identify it separately so it is not mistaken for a recurring paycheck.
2. List commitments before choosing a spending target
Record bills, instalments and other commitments you already know about. Include the amount, expected date and whether the figure is confirmed or estimated. Recent records can help reveal an expense you forgot, but last month’s spending is not automatically the right plan for this month.
Keep an eye on double counting. If a purchase is recorded in one category and its payment is also included in a card total, decide how your chosen system handles that relationship. Counting the same cost twice makes the remaining budget artificially small; missing it altogether makes the result artificially large.
The CFPB provides a bill-calendar resource for organising obligations by date. It is a useful companion to a monthly total when timing is part of the problem.
3. Include variable spending and intentional reserves
Not every expense has a fixed bill. Add estimates for the variable categories relevant to you, and identify amounts you intend to reserve for a particular purpose. In Monthly, weekend reserves can be kept separate from other parts of the plan.
Choose categories that answer a question you care about. Splitting groceries into ten subcategories may be helpful for one person and unnecessary work for another. A useful category is one you understand and can maintain, not simply one that makes a chart look detailed.
A reserve is a planning decision. Recording it in an app does not transfer money into a separate bank account or prevent you from spending it elsewhere.
4. Work through a complete example
Suppose a person records 3,000 currency units of income for a month. They enter 1,700 of fixed commitments, 600 of variable spending and 300 of planned reserves. All figures use the same currency.
| Part of the plan | Illustrative amount | What to verify |
|---|---|---|
| Income | 3,000 | Amount and expected payment date |
| Fixed commitments | 1,700 | Bills and instalments included once |
| Variable spending | 600 | Estimates for relevant categories |
| Planned reserves | 300 | Purpose and whether already counted elsewhere |
| Difference | 400 | Missing entries and payment timing |
The arithmetic is 3,000 minus 1,700 minus 600 minus 300, leaving 400. That difference is not a guarantee that 400 can safely be spent today. It depends on the entries being complete and on the income being available when needed.
Now suppose a bill increases by 80. Updating the recorded commitment reduces the difference to 320. The useful result is not a particular target: it is being able to explain the change rather than wondering why the totals disagree.
Monthly’s own summary depends on the categories and records you enter. This simplified example is not a specification of every calculation in the app. The Monthly FAQ explains available money and investment totals.
5. Check dates as well as totals
A month can look balanced while an early bill falls due before the next paycheck. Write down the relevant dates rather than assuming that a positive monthly difference solves every cash-flow problem.
The CFPB’s cash-flow budget worksheet helps examine money coming in and going out over shorter periods. That timing check is separate from simply comparing monthly totals.
If your first draft shows a shortfall, preserve the actual figures. Changing an estimate only to make the summary positive hides the issue. Identify which information is uncertain and seek appropriate assistance if you cannot meet an obligation; this guide does not recommend which debts or essential costs to prioritise.
6. Put the plan into a tool you will use
You can follow this process on paper, in a spreadsheet or in a budgeting app. Monthly offers a prepared monthly structure and does not require bank credentials. You still need to enter and review your records; it does not retrieve your live bank balance or move funds.
Start with the month, add income, then enter known commitments and reserves. Review the summary and correct anything that does not match your records. The product walkthrough and feature guide describe what the app supports.
Monthly uses cloud providers for storage and synchronisation. It is not a fully offline, device-only ledger. Read the Privacy Policy before deciding what information to add.
A checklist for your next review
- Is the plan for the right month?
- Are expected payments separate from confirmed income?
- Is each commitment counted once?
- Did any bills, dates or estimates change?
- Does the remaining figure match the entries you intended to include?
- Have you checked timing, not only the monthly total?
- Can you preserve a copy of the records you need?
You do not need to rebuild the budget every time something changes. Update the affected entry, understand the difference and continue reviewing the same plan. Export options can help you retain records for your own analysis.
Ready to try the process? Open Monthly and create your first monthly plan. Begin with the income and commitments you already know; add detail when it helps you make the plan clearer.
If you are still choosing a tool, compare the best budgeting apps for monthly planning before you start.