# How to build your SMB's annual budget with AI (and keep it useful all year) > Guide to the annual budget with AI: start from real data, build by scenarios and the monthly follow-up that keeps it alive. - Canonical: https://serchai.com/en/guides/ai-business-budget/ - Site: Serchai (https://serchai.com) — AI tools comparator - Language: en - Updated: 2026-07-26 --- ## Tools you will use - [Holded](https://serchai.com/en/reviews/holded/) — Invoicing, accounting and SMB management in the cloud, with AI in the flow. - [Gemini](https://serchai.com/en/reviews/gemini/) — Google's assistant, built into Gmail, Drive and Android. - [Gamma](https://serchai.com/en/reviews/gamma/) — Turns a text or a topic into presentations and documents that look good. ## The steps, in short 1. **Start from the real year, not the wished-for year** — Tagged history is the honest base: the budget from scratch invents, the one starting from data adjusts. 2. **Build by scenarios, not a single figure** — The base, the prudent and the ambitious, with each one's assumptions written down. 3. **Bring the budget down to concrete decisions** — Hires, investments and caps per line item: a budget is a plan, not a sheet. 4. **Set up the monthly follow-up or it dies in March** — Budget against actuals every month, deviations explained and adjustments without drama. > **TLDR:** The typical SMB annual budget gets made in December with enthusiasm, filed in January and remembered in summer with embarrassment. The system that works: start from real history (Holded's tagged data), build three scenarios with written assumptions, bring it down to concrete decisions (hires, investments, caps) and the monthly budget-against-actuals ritual that keeps it alive. AI speeds up construction and follow-up: the plan's decisions remain yours. This guide is for anyone running an SMB and budgeting loosely (or not at all): the year that starts with a wished-for sales figure and no plan for what produces it. A useful budget is not guessing the future: it is deciding in advance what you will do in each scenario, so you decide calmly what otherwise gets decided in a rush. ## 1. Start from the real year, not the wished-for year The honest budget starts by looking back: the current year by months and by lines, which with [Holded](https://serchai.com/en/reviews/holded/)'s tagged accounting and the previous guides' flow already exists without archaeology. Revenue per line with its seasonality, fixed costs with their known increases, variables with their proportion over sales. On that base, the named adjustments: what you know will change (the lease renewing, the contract ending, the announced supplier increase) enters with its figure, and what you wish would change (selling more) enters step 2 as a scenario with assumptions, not as a figure fallen from the sky. The classic trap this base avoids: the budget inheriting December's optimism, when the year's fatigue gets cured by fantasizing about the next one. ## 2. Build by scenarios, not a single figure The single figure is fragile and it also lies: nobody knows next year. The three scenarios with written assumptions: the base (last year plus known changes, no heroics), the prudent (sales 15-20% down: which costs get touched and when?) and the ambitious (the desired growth: which investment produces it and when does it get cut if it does not arrive?). [Gemini](https://serchai.com/en/reviews/gemini/) (from $4.99 a month, with a free tier) speeds up construction: you hand it the history and the assumptions and build the scenarios conversationally. It fits here because an SMB budget lives in a Drive spreadsheet and it works inside that sheet, and because at $4.99 a month the tool does not eat the saving the exercise is chasing. The sensitivity simulations ("what if cost X rises 10%?") are the ones that feel like a chore by hand. The usual rules: verified calculations and written assumptions, because the scenario without explicit assumptions cannot be revisited when reality weighs in. The three scenarios' value is not precision: it is that the hard decisions (what to cut, when to stop an investment) get thought through in December calmly, not in the bad month with anguish. ## 3. Bring the budget down to concrete decisions The budget that stays as figures per line item is a sheet: the useful one comes down to decisions. Hires with their when and their condition ("the second salesperson joins if the first quarter meets the base"), investments with their cap and cut-off criterion, spending caps per line item that turn monthly control into traffic lights, and the explicit cushion for what nobody budgeted, because there always is some. Those conditional decisions are the system's heart: the budget stops being a prediction (which will fail) and becomes an action plan by scenarios (which works even when the prediction fails). The shareable version fits one page with [Gamma](https://serchai.com/en/reviews/gamma/) (free credits to start): the three scenarios, the key decisions and the traffic lights, for partners, bank or team. ## 4. Set up the monthly follow-up or it dies in March The budget lives or dies in the follow-up: the monthly budget-against-actuals comparison, embedded in the [financial reports](https://serchai.com/en/guides/ai-financial-reports/) ritual. Relevant deviations (the threshold is fixed beforehand: 10% on large items) get explained in one line each, and the explanation feeds action: the one-off deviation gets noted, the structural one triggers the scenario adjustment. Adjustment without drama is the mature system's mark: the budget gets revised by quarters if reality drifts, because a map that no longer describes the territory is useless for navigating. Revising is not failing: it is exactly what the assumptions were written for. And the circle closes where it started: this year's tagged actuals are next year's honest base, each time with less work and better aim. The whole sector lives in [AI for accounting and finance](https://serchai.com/en/ai-for/accounting-finance/). ## Common mistakes Budgeting from desire. The dreamed sales figure with no plan producing it is the budget that embarrasses in summer. History plus known changes is the base that holds. The single figure without scenarios. The budget that only contemplates everything going well fails to help exactly when needed: in the scenario that did not go well. Figures without decisions. The line-item document without hires, investments or conditional caps is accounting of the future, not a plan. Budget without follow-up. The monthly budget-against-actuals ritual is what separates the living plan from the December document. Without it, everything before was ceremony. ## Frequently asked questions ### How long does a budget like this take? With tagged history, the first time is a couple of sessions (base, scenarios, decisions) plus the shareable page. Following years, less: the structure is inherited and only data and assumptions get updated. ### Can AI make the budget alone? It can assemble the numbers on your history and play the scenarios with you, which is the mechanical work. Business assumptions and conditional decisions are exactly what does not get delegated: it is your plan, not its prediction. ### What do I do when actuals drift from the budget? First understand the deviation (one-off or structural?), then act on what the scenarios already decided, and if reality truly changed, revise the budget by quarter. The budget rigid in the face of evidence is not discipline: it is denial. ### Are budget and cash-flow forecast the same thing? They are cousins with different horizons: the budget is the annual plan of results and decisions, the [cash-flow forecast](https://serchai.com/en/guides/ai-cashflow-forecast/) is the thirteen-week cash movie. They feed each other and neither replaces the other.