Business budget calculator

‍How to use the business budget calculator

Only 2 fields are required: your revenue and your salaries. Everything else is optional, and each optional section unlocks an extra insight. Here's the quickest way through it.

1. Choose your currency. SGD is the default, and USD, HKD, AUD, EUR, and GBP are also supported.

2. Add your cash on hand. This is optional but worth 10 seconds, because it unlocks your cash runway if you're operating at a loss and your buffer coverage if you're profitable.

3. Enter your monthly income. Separate revenue from sales, other operating income, interest, and grants, so you can see which streams actually drive the business.

4. Fill in your monthly expenses. Salaries and wages sit here too, alongside rent, marketing, software, insurance, and inventory. Count your own salary as well. If the business only works because you work for free, that's worth knowing now rather than later.

5. Add one-time costs if you have any coming up. Pick a template, from business setup and marketing campaigns to office openings, events, website builds, equipment purchases, product launches, trade shows, and recruitment drives. Add as many as you need, or build your own with the custom option, where you can rename every field.

6. Read your summary. You'll see your budget balance, profit margin, cash position, payback period, a breakdown of where your money goes, and up to 3 insights that tell you what to look at first.

A tip from us: use the calculator both ways. Enter last month's actual figures to understand where your money went, then enter your planned figures to set next month's budget. The difference between the two is usually where the most useful conversations start.

What is a business budget, and why should you care

A business budget is simply a plan for your company's money over a set period, usually a month, a quarter, or a year. It sets out how much you expect to earn, how much you'll spend, and what should be left over. Your P&L tells you what happened. Your budget tells you what you wanted to happen, and the gap between the two is where the useful information lives.

Here's why this matters so much in Singapore specifically. QBE's annual SME survey found that 51% of Singapore SMEs struggle with managing cash flow and accessing funding, up from 36% just a year earlier. And the Singapore Business Federation's National Business Survey found that among businesses facing a credit crunch, more than a third don't hold enough cash to operate for even 3 to 6 months. 

The pattern behind those numbers is rarely a lack of revenue. It's costs drifting quietly for months while nobody compares actual spending against the plan. A working budget fixes that in 3 ways:

- Visibility: you know your true monthly cost base instead of guessing
- Early warning: a negative budget balance shows up months before a cash crisis does, while the fix is still cheap
- Faster decisions: hiring, pricing, and expansion calls get easier when you know exactly how much slack you have

Built for how startups, SMEs, and mid-sized businesses actually budget

The maths of budgeting is the same at every stage. What changes is which number deserves your attention, and the calculator surfaces all of them.

Startups: watch your runway

If you're pre-revenue or early-revenue, running at a loss is usually the plan, not the problem. The real question is whether your burn matches your milestones. Enter your monthly figures and cash on hand, and the calculator shows how many months you can operate before the account hits zero. Our advice: if your runway is shorter than the time to your next funding milestone plus about 6 months of fundraising time, treat that as this week's problem, not this quarter's. Given that most Singapore SMEs hold less than 6 months of runway, you won't be alone, but you do want to be ahead of it.

SMEs: watch your margin and your buffer

For an established business, the budget balance and profit margin are your operating heartbeat. Two companies with identical revenue can have completely different resilience depending on margin. The calculator benchmarks yours, flags when payroll is taking an outsized share of income, and shows how many months of expenses your cash covers. A buffer of 3 to 6 months of operating expenses is the target most finance advisers suggest. If one late-paying customer or one soft month would push you into difficulty, the insights panel will surface that before your bank statement does.

Mid-sized businesses: watch the category mix

Once you're running multiple teams or markets, the risk is rarely one big cost. It's drift across many categories at once: software subscriptions that outlived the teams that bought them, marketing spend that grew with revenue but never got re-justified. The "where your money goes" breakdown ranks your top cost categories as a share of total spend, which makes drift visible at a glance. It's also a quick scenario tool: raise the salaries figure to model a hiring plan, or trim revenue by 10% to see how your margin holds before you commit to new fixed costs.

What the calculator measures

Monthly budget balance

Income minus all expenses. Positive means your operations fund themselves. Negative means you're drawing down cash, and the runway figure tells you for how long.

Profit margin

Your budget balance as a percentage of income. As rough guidance: under 10% is thin and leaves you exposed to small shocks, 10 to 20% is healthy for most operating businesses, and above 20% gives you real room to reinvest. Margins vary a lot by industry, so treat these as starting points. For a deeper look at just this number, try our margin calculator.

Cash runway or cash buffer

Both come from the same input, your cash on hand. If your balance is negative, you'll see runway: how many months until the money runs out. If your balance is positive, you'll see buffer coverage: how many months of expenses your reserves cover. Below 3 months, prioritise building reserves. Well above 6, your surplus cash is sitting idle, and you can put it to work earning returns with Yield.

Payback period

Your one-time costs divided by your monthly budget balance. Spend SGD $50,000 on a new office fit-out while keeping SGD $2,000 a month, and your payback period is 25 months. Under 2 years is generally strong for a small business. Beyond 3 years, it's worth a rethink: reduce the outlay, lift the margin, or stage the investment.

Where your money goes

Your top 5 cost categories ranked as a share of total spend, salaries included. This is where budget reviews earn their keep. A 5% saving negotiated on your largest category usually beats aggressive cuts across all the small ones, and it takes one conversation instead of ten.

How to create a business budget in 5 steps

The calculator handles the arithmetic. These 5 steps handle the thinking behind it.

1. Start with real income figures. Use your average monthly revenue from the past 3 to 6 months rather than your best month. Pre-revenue? Build a conservative case and budget against that one.

2. List fixed costs first. Rent, salaries, insurance, and software subscriptions don't move with sales, so they set the floor your income has to clear every month.

3. Add variable costs. Inventory, transaction fees, delivery, and performance marketing usually rise with revenue, so estimate them as a percentage of sales if that's how they behave.

4. Keep a little aside for surprises. Unexpected costs always come, so reserve 5 to 10% of monthly expenses for them, and work towards a cash reserve of 3 to 6 months of expenses over time.

5. Compare your actuals against the plan each month. This is honestly the step that matters most. The budget itself is just a starting point; checking how reality compared to it is what tells you something.

Make it a habit, not a one-off

Here's the simple routine we'd suggest, and it takes about 30 minutes a month.

At the end of each month, pull your actual figures from your business account and run them through the calculator. Ask yourself 3 quick questions: did the balance land where you expected, which category moved the most, and did your cash buffer grow or shrink. Jot down the biggest surprise and why it happened. That's it. Done every month, this catches cost drift in weeks instead of quarters. If your spend is already categorised in real time through your cards and account, the whole thing takes minutes, which is exactly what Aspire's expense management and budgets are built for.

Then, once a quarter, spend a little longer and look forward instead of back. Re-run the calculator with your best estimates for the next 3 months, and stress-test it: reduce the revenue field by 10% and see if your balance stays positive. That 10-second test is the cheapest early warning system available to any business.

Before any big commitment, model it here first. A new hire is a permanent rise in your salaries figure. New equipment or an office move is a one-time cost block with a payback period you can see instantly. Raising funds? Run your current burn to see how much runway the raise actually needs to buy you.