Build a twelve-month budget or forecast with an AI agent
A Monmo agent can build your budget or forecast. It reads last year's actuals from Xero or an Excel export, cleans them, and lays out twelve months in Google Sheets or Excel with formulas instead of typed numbers. Every figure traces back to an assumptions sheet, and best, expected and worst cases sit side by side. The assumptions remain yours to set.
Updated 2026-11-13 · Free to start. Paid plans from $15 a month.
How the agent does it
- 01
It starts from last year's actuals
Point it at the numbers you have: profit and loss by month in Xero, or a file such as FY26-actuals.xlsx. Reading them needs no approval. It lists the accounts it found and asks how to group them.
- 02
It cleans the baseline
Before forecasting it looks for things that distort the year: an invoice entered twice, a one-off cost, a missing month. It reports what it found, for example a freight bill of $8,400 counted twice, and what it corrected.
- 03
It asks for the assumptions
Growth, price changes, new hires, a launch month, payment terms. Where you have no view, it proposes a figure from last year's trend and labels it as its own suggestion for you to change.
- 04
It builds twelve months with formulas
Revenue lines, cost of goods, payroll and overheads are laid out month by month. Each cell is a formula that points to the Assumptions sheet, so changing one input updates the whole year.
- 05
It adds three scenarios
Best, expected and worst cases share one structure with different inputs. A single switch on the Scenarios sheet changes the view, and a chart compares the net result and the lowest cash point of each.
- 06
It checks its own arithmetic
Totals are tested against the sum of their rows, last year's figures are tied back to the source, and the workbook is reopened to confirm no formula returns an error. Then it writes a one-page summary.
What is in the workbook
- A workbook with four sheets: Summary, Monthly plan, Scenarios and Assumptions
- Formulas throughout, so one changed assumption updates all twelve months
- Best, expected and worst cases, each with its break-even month and lowest cash point
- A list of what was corrected in last year's actuals, and why
- The assumptions the agent suggested itself, marked for you to confirm or change
When it asks you
Reading Xero and building the workbook need no approval, and the file is kept in the Library. The agent asks before it creates the spreadsheet in your Google account or shares it with anyone. Nothing in Xero is changed by this job.
How to ask
- Build next year's budget from last year's actuals in Xero. Twelve months, formulas not typed numbers, with best, expected and worst cases. Tell me when we break even.
- Here is FY26-actuals.xlsx. Add the Japan launch from March and forecast cash month by month. Flag any month where cash drops below $50,000.
- On the first working day of each month, update the forecast with last month's actuals from Xero and tell me which lines are more than 10% off plan.
Watch it work
A sample replay with example data, sped up. Pause it, scrub through it, or take the mouse yourself.
On screen
Google Drive
Google Sheets
Pick a job. Watch it get done.
Your team. Connected to everything.
FY27 launch budget+FY27 launch budget
Expected case · prepared by Ren · sample data
Japan launch adds $474k from March.
Sea freight, six-week lead time.
Marketing peaks in launch month.
Sample replays with fictional data, sped up. Pause one, scrub through it, or take the mouse yourself.
Questions people ask
Can an AI agent build a budget in Excel or Google Sheets?
Yes. A Monmo agent reads your actuals, builds a twelve-month plan in a real spreadsheet with working formulas, and adds scenarios and a summary. It delivers an Excel file or a Google Sheet that you can open and edit. The assumptions behind the numbers, such as growth and hiring, are yours to set and to sign off.
Where does the agent get last year's numbers?
From the source you connect or share: a profit and loss report in Xero or QuickBooks, an Excel or CSV export, or a Google Sheet. It reads through your own account and sees only what that account can see. If two sources disagree, it shows you both figures and asks which one to trust.
Is a forecast built by an AI agent reliable?
The arithmetic can be checked: every total is a formula and every input sits on one sheet. A forecast is still a set of assumptions about the future, and the agent cannot know your plans better than you do. Review the Assumptions sheet first, and have your accountant look over anything that goes to a bank or an investor.
Can it keep the forecast up to date each month?
Yes, as a routine. On the first working day of each month, for example, the agent reads last month's actuals, places them beside the plan, recalculates the remaining months and tells you which lines moved most. Changing a shared spreadsheet is a write, so it shows you the update and asks before it saves.