Bookkeeping tells you what happened last month. Financial planning and analysis (FP&A) tells you what is about to happen, and what you can still change. Large companies have whole departments for it. Most growing businesses have a set of accurate books and an owner doing the forecasting in their head. This guide covers the four tools that make up most small-business FP&A, how to run them in a few hours a month, and the signs that it is time to add them.
Key Takeaways
- FP&A is forward-looking: budgeting, forecasting and analysis that support decisions. Bookkeeping, which records the past, is what it is built on.
- An annual budget sets the plan; a rolling forecast, updated monthly, shows where you are actually heading.
- A 13-week cash flow forecast, week by week, is the single most useful tool for a business that has ever been surprised by its bank balance.
- Monthly variance analysis (actual vs budget, with a short explanation for each large gap) turns reports into decisions.
- Scenario planning answers questions like “can we afford this hire?” before you commit, not after.
FP&A vs bookkeeping
Bookkeeping and accounting record and report what has already happened: every transaction categorized, accounts reconciled, a profit and loss statement and balance sheet at month-end. FP&A takes those numbers and looks forward. What will cash look like in eight weeks? What happens to margin if a big client leaves? Which service line actually makes money?
The order matters. Forecasting on top of books that are late or wrong just produces confident-looking guesses. Clean, monthly-closed books come first. See our bookkeeping service if that part is not in place yet.
Tool 1: Budget, then a rolling forecast
An annual budget is the plan for the year: expected revenue by month, the costs that go with it, and the profit you are aiming for. It is fixed once agreed, so you can measure against it.
A rolling forecast is your best current estimate, updated every month and always looking twelve months ahead. When the year does not go to plan, and it rarely does, the budget tells you how far off plan you are and the forecast tells you where you will actually end up. For most growing businesses, monthly detail for the next twelve months is enough, with quarterly detail beyond that if you need a longer view.
Tool 2: The 13-week cash flow forecast
Profitable businesses still run out of cash, because profit is recorded when revenue is earned and cash arrives when customers pay. A 13-week cash flow forecast lays out, week by week for the next quarter:
- the opening bank balance;
- cash expected in, from receivables by customer and expected payment date;
- cash going out: payroll, rent, suppliers, loan payments, and tax deposits including estimated tax payments and payroll taxes;
- the closing balance, and the lowest point in the period.
Updated weekly, it shows a cash squeeze six or eight weeks out, while there is still time to chase a receivable, move a purchase, or arrange a line of credit on your own terms rather than in a hurry.
Tool 3: Variance analysis
Once a month, after the books are closed, compare actual results with the budget and the latest forecast, line by line. For every material gap, write one sentence on why: a price change, a lost client, a timing difference, a cost that crept up. The value is in the explanation, not the table. Three months of “timing” on the same line is usually not timing.
Tool 4: KPIs and scenario planning
Pick a handful of measures that actually drive your business, not thirty. For most service businesses, that is gross margin, revenue per employee or per billable hour, days sales outstanding, and cash runway. Our guide to financial KPIs gives the formulas.
Scenario planning puts the forecast to work on real decisions. Before you hire, sign a lease or take on a large contract, run a base case, a downside and an upside. A typical example: a new hire adds salary, payroll taxes and benefits from day one, while the revenue they bring in may take months to arrive. The scenario shows whether cash can carry that gap, and for how long, before you make the offer.
Signs your business needs FP&A
- You have been surprised by your bank balance in the last six months.
- You are profitable on paper but always short of cash.
- You are planning a hire, an expansion, a large purchase or a loan application.
- Revenue has grown but profit has not kept pace, and you are not sure why.
- A lender, investor or potential buyer has asked for a forecast. See what drives your business’s value.
A monthly FP&A rhythm
- Close the books promptly after month-end. We aim for the first two weeks.
- Run variance analysis against budget and forecast, with a sentence for each material gap.
- Update the rolling forecast for what you now know.
- Refresh the 13-week cash forecast, weekly if cash is tight.
- Go over the KPIs and agree one or two actions.
For an owner-run business, that is a few hours a month once the templates exist. Most of the work is in setting it up the first time.
How Ledger Tree helps
Ledger Tree works mainly with established, privately held businesses in the $1 million to $20 million revenue range across Dallas–Fort Worth. Our FP&A service builds the budget, rolling forecast and 13-week cash forecast from your own books, then runs the monthly rhythm with you, so the numbers are there when you need to make a decision. Call (214) 807-2440 to talk it through.
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Frequently Asked Questions
What is the difference between FP&A and bookkeeping?
Bookkeeping records and reports what has already happened, producing accurate monthly financial statements. Financial planning and analysis uses those statements to look forward, through budgets, forecasts, cash flow planning and analysis that support decisions. Reliable books come first, because forecasts are only as good as the numbers they start from.
What is the difference between a budget and a forecast?
A budget is the plan for the year and stays fixed once agreed, so you can measure performance against it. A forecast is your best current estimate of where the business is heading, and a rolling forecast is updated every month to keep looking twelve months ahead.
What is a 13-week cash flow forecast?
A week-by-week projection of cash coming in and going out over the next quarter, starting from your current bank balance. It shows the lowest balance you are likely to hit and when, so you can act on a cash shortfall weeks before it happens.
How detailed should a small business forecast be?
For most growing businesses, monthly detail for the next twelve months is enough, with quarterly detail beyond that if a longer view is needed. Cash is the exception: a 13-week cash forecast works best week by week.
When does a small business need FP&A?
Common signs are cash surprises despite being profitable, planning a hire, expansion or loan, revenue growing faster than profit, or a lender, investor or buyer asking for a forecast. The earlier the tools are in place, the more decisions they can inform.
How much time does FP&A take each month?
Once the budget, forecast and cash templates are set up, an owner-run business can usually run the monthly cycle in a few hours: close the books, compare actuals with the plan, update the forecast, refresh the cash view and check a handful of KPIs.
Sources: Ledger Tree Financial Group practice guidance. Related detail: IRS estimated tax and payroll deposit schedules (see our Q3 estimated tax and Texas payroll tax guides) for the tax lines in a cash forecast. Updated 2026-09-26.