Key Takeaways
- Build the budget, then run the business on a rolling forecast. The budget is the plan you set in the fall and measure against all year. The rolling forecast is updated every month after the close and always looks 12 to 24 months ahead, so it is the number you make decisions from.
- A useful 2027 budget is built in six steps: set the goals and constraints, build revenue from its drivers, budget headcount by name and start date, separate fixed costs from variable ones, clearly show a view where the P&L budget converts to a monthly cash model, and write a downside case with triggers agreed in advance.
- Check the starting numbers before you project anything. Is cash reconciled to the bank statements? Do receivables and payables match the aging reports? Did your CPA’s year-end adjustments make it into the books? If any of those are off, every line you project inherits the error.
- Give the process four to six weeks and one owner. Benchmarking research shows top-performing companies finish the annual budget in 25 days or less (with modern AI tools, often faster), and that most of the elapsed time goes to waiting on inputs and rework.
It is the middle of October. Last year’s budget was last year’s P&L with 10% added to every line, approved in a hurry the week before the holidays. By March nobody was referencing it. Revenue came in lumpy, two hires started a quarter late, and the one month that was supposed to be comfortable turned into a scramble to cover payroll.
That budget failed because of how it was built. A budget is a snapshot. It is built in October from what you knew in October, and by March some of it is already wrong. That is expected. What keeps a company out of trouble is the rolling forecast that sits on top of it: a monthly update of where the next 12 to 18 months are actually headed. If the budget is the map you drew before the trip, the forecast is your headlights.
So build the budget, and build it well. For a company between $5M and $50M in revenue, that takes four to six weeks of focused work in the fourth quarter. Then run the rest of the year on the forecast. Here is how to do both.
What is an annual budget supposed to do?
A budget is your plan for the year expressed in dollars: what you expect to sell, what you will spend to do it, who you will hire, and what all of that does to cash. It is set once, usually approved by the owners or the board, and used as the yardstick for the year.
It has three jobs. It forces decisions about priorities while there is still time to make them calmly. It gives every department head a number they agreed to. And it gives you something to measure against, so that when April comes in $80,000 under plan you know by the tenth of May and can see which line caused it.
Most small and midsize companies feel the absence of that discipline somewhere. In the Federal Reserve Banks’ most recent Small Business Credit Survey, 94% of employer firms reported at least one financial challenge in the prior 12 months, with paying operating expenses and uneven cash flow among the most common. What a budget cannot do is tell you where you are headed once the year starts. That is the job of two forecasts: a rolling forecast that looks 12 to 18 months out, and a 13-week cash flow forecast built from actual expected receipts and payments (the direct method), which reflects what is happening in the bank right now.
Why the rolling forecast matters more than the budget
The budget is the plan you committed to at the start of the year. It stays fixed, and that is its value: it tells you how you are doing against what you promised.
The rolling forecast is your current best estimate of where things will land, and it keeps moving forward. Each month, after the books close, you drop the month that just ended, add a new month at the end, and update everything in between with what you now know. It always looks 12 to 18 months out, so in October you are already looking at next fall, well past December 31.
That is why our founder, Dan DeGolier, treats the forecast, and the cash flow forecast in particular, as the more valuable tool for running a business. The budget answers how you did against plan. The forecast answers the questions a CEO faces every month: can we make this hire, take on this customer, or get through a slow quarter?
For a smaller business, a forecast refresh should take a few days. APQC, a nonprofit that benchmarks business processes, studied nearly 3,900 organizations and found that top performers turn a forecast in about 8 days, against a median of 11. If yours takes weeks, the model is too complicated or the books are closing too slowly.
Keep both. Measure performance against the budget, and make decisions from the forecast. Most companies under $50M do best with an annual budget plus a rolling forecast on top of it. We cover the tradeoffs in more detail in rolling forecasts vs. annual budgets.
Before you start: check the numbers you are starting from
When our CFOs open a new client’s balance sheet, the first thing they check is whether it reconciles. Are the material bank balance sheet accounts reconciled? Do receivables and payables match the aging reports? Did your CPA’s year-end adjustments make it into the books? If any of those are off, the books underneath the budget have errors in them.
Fixing that rarely means rebuilding the entire history of the company. For a long-running business, the practical approach is to pick a date, often January 1, build a clean opening balance sheet as of that date, and roll forward from there. If a sale, a raise, or a significant bank loan is likely in the next few years, plan on at least three clean years, because that is the window buyers, investors, and lenders usually ask to see.
Two more checks are worth an afternoon before budgeting starts:
- Confirm the books are on an accrual basis (revenue recorded when earned and expenses when incurred, regardless of when cash moves). A budget built on cash-basis history bakes last year’s payment timing into next year’s plan. Our guide to cash vs. accrual accounting covers the conversion.
- Confirm every balance sheet account was reconciled through the most recent month-end. If nobody can say what makes up the balance in accrued liabilities or customer deposits, the budget’s cash projections will be off by whatever is hiding there.
Get right-sized financial leadership from experienced CFOs ready to lead your team.
Six steps to build the budget
There is more than one way to build a budget. Top-down starts with the targets leadership sets and allocates them to departments. Bottom-up starts with each department’s inputs and adds them up. The six steps below are a hybrid of the two, and the examples lean toward a recurring-revenue business. Treat it as one workable approach. The right mix depends on your business model.
1. Set the goals and the constraints first
Start with three to five outcomes the company needs from 2027, stated as numbers: revenue of $14M, gross margin of 42%, a second location open by July, the line of credit paid down to $500,000. Then write down the constraints. These are the limits the plan cannot cross, such as a minimum cash balance of two months of operating expenses, a debt covenant, or an owner distribution that has to happen. Every later step gets tested against this short list.
2. Build revenue from its drivers
“Last year plus 12%” is a guess. A driver-based revenue budget starts with the things that produce revenue and multiplies them out: number of sales reps, times deals per rep per quarter, times average contract value. For a construction company, signed backlog plus expected awards, scheduled by month of work. For a subscription business, opening customers plus new customers less churn, times price.
The benefit shows up in the middle of the year. When revenue misses, you can see which input missed (fewer deals, smaller deals, slower starts) and respond to that specific problem.
3. Budget headcount by name and start date
This step matters most for people-heavy businesses like SaaS and services, and less for capital-intensive ones. Payroll is the largest cost in most growing companies, and it is the line most often budgeted wrong. List every current employee and every planned hire with a start month and a salary. Then load each one for payroll taxes and benefits. The Bureau of Labor Statistics reports that benefits make up about 30% of total compensation cost for private-industry employers, so a $100,000 salary costs you well above $100,000.
Be honest about start dates. A hire budgeted for January who starts in April changes both the cost and whatever revenue that person was supposed to produce.
4. Separate fixed costs from variable ones
Go through the expense lines and mark each as fixed (rent, salaried staff, insurance, software subscriptions) or variable (materials, commissions, shipping, hourly labor). This is what lets you answer the question every owner should ask in budget season: what happens to profit and cash if revenue lands 15% under plan? Variable costs fall with revenue. Fixed costs stay put, which is why a 15% revenue miss can erase far more than 15% of profit.
5. Turn the P&L budget into a cash budget
A P&L budget can show a profit in a month you can’t make payroll. Converting it to cash means adjusting for timing and for everything the P&L leaves out:
- Collections lag revenue. Look at how long each major customer takes to pay, and plan on that. Our founder’s rule is to take the customer’s average days to pay and add 15.
- Loan principal payments, equipment purchases, and owner distributions use cash and never appear as expenses.
- Inventory and prepaid costs go out before the related revenue comes in.
- Tax payments, annual insurance premiums, and bonuses land in specific months.
The output is a month-by-month cash balance for the year. The lowest point on that schedule is the number to plan around. If it dips below your minimum, you have until then to arrange a credit line, move a hire, or change payment terms. A rolling cash flow forecast picks up from there in January and gets updated every month for the rest of the year, and a 13-week cash flow model gives you the close-up.
6. Write the downside case and agree on the triggers
Build one alternate version of the budget in which revenue comes in 15% to 20% below plan. It’s important to build a budget sheet with input and tab options so you can input dynamic drivers and review potential outcomes. Then decide, now, what you would do about it and what would cause you to act. For example: if bookings are more than 15% behind plan at the end of the first quarter, the two open sales hires are frozen and the equipment purchase moves to 2028.
Deciding in October is easier than deciding in May with cash tightening. It also supports a principle our CFOs repeat often: when you have to cut, cut fewer times and cut deeper. A written trigger makes that possible.
Speak to a CFO
Budget season is when most of our clients build their plan and rolling forecast for the coming year, and it is a natural time to bring in senior finance help. If you want a 2027 budget that ties to cash and holds up in a board meeting, book a CFO strategy call with Ascent CFO Solutions.
How long should the process take, and who owns it?
Data from APQC (a nonprofit that benchmarks business processes), published by CFO.com, shows top-performing organizations completing the annual budget in 25 days or less, about half the time of those at the 75th percentile. The same research found that finance teams spend relatively little of that time working on the budget. Most of it is spent waiting for inputs and going back and forth, and the median organization produces five versions before it is done.
Three habits keep a growing company near the fast end of that range:
- One person owns the calendar and the model. In a company without a CFO, that is usually the controller with the CEO making the calls on goals and tradeoffs.
- Department heads get a template with last year’s actuals already filled in and a due date, and they are asked for drivers (hires, volumes, prices), with finance doing the arithmetic.
- Start later than feels comfortable. Beginning in mid-October with nine months of actuals in hand produces a better budget than beginning in August and revising it three times.
After January, run the business on the forecast
The budget earns its keep in the monthly review. Ideally within 10 days of month-end, compare actual results to budget line by line, and have a named person explain every variance above a threshold you set, such as 10% or $10,000. Then ask the forward-looking question: does this change the forecast for the rest of the year? Then update the rolling forecast: drop the closed month, add a new one at the end, and re-forecast the rest. If the forecast now shows cash dipping below your minimum in August, you find out in March, with five months to act.
That review depends on a timely close. If the books for March aren’t final until late April, the variance conversation is about ancient history. This is often where a fractional controller and accounting team pays for itself, because the budget is only as useful as the actuals it is compared to. A short list of operating metrics reviewed alongside the financials helps too, and we cover how to choose them in implementing KPIs without overwhelming the team.
Frequently asked questions
When should a company start its annual budget?
For a calendar-year company, start in early to mid-October and aim to have an approved budget by early December. That gives you nine months of actual results to work from and leaves time to communicate targets before January. Companies with a board or outside investors often need a draft a few weeks earlier to fit the board calendar.
What is the difference between a budget and a forecast?
A budget is the fixed plan for the year, set in advance and used as the benchmark. A forecast is a running estimate of where results will land, updated as the year goes on. You measure performance against the budget and make decisions from the forecast.
Should we replace our annual budget with a rolling forecast?
For most companies under $50M, keep both. The budget gives everyone a fixed target and a yardstick for the year. The rolling forecast is what you run the business on month to month. Drop the budget and you lose the yardstick; skip the forecast and you are driving on a plan you made last October.
How do you create a budget for a business with unpredictable revenue?
Build revenue from drivers and work in ranges. Set a base case you believe, a downside case 15% to 20% lower, and keep fixed costs at a level the downside case can support. Then tie discretionary spending, such as new hires and equipment, to revenue milestones so that spending follows results.
Should a small business use zero-based budgeting?
Zero-based budgeting (justifying every expense from zero each year, with no reference to prior spending) is thorough and slow. For most companies under $50M, a full zero-based exercise every year costs more time than it returns. A practical middle path is to zero-base two or three large discretionary categories each year, such as software, marketing, and outside contractors, and budget the rest from history adjusted for known changes.
What should be included in a company budget?
At minimum: a monthly P&L budget with revenue built from drivers, a headcount plan, a capital spending plan, a monthly cash budget, and one downside scenario. Companies with debt should add a covenant calculation for each quarter so that a potential breach is visible months ahead.
Who should own the budget in a company without a CFO?
The CEO owns the goals and the final decisions. The controller or senior accountant usually owns the model and the calendar. What tends to be missing is someone who can challenge the assumptions, connect the plan to cash, and build the scenarios. That is the work a fractional CFO does during budget season, often in a few focused weeks.
Build the budget, run on the forecast
We help founders and CEOs of growth-stage companies across the country build budgets and forecasts they can run the business on. Our fractional CFOs lead the planning process, our accounting teams make sure the history underneath is accurate, and our cash flow forecasting work keeps the plan tied to the bank balance all year. For more on the forecasting side, see how to build financial forecasts that drive real decisions.
Contact Us
Questions or business inquiries regarding our part-time CFO, finance and accounting services are welcome at: info@ascentcfo.com
