Most new businesses don’t fail because the idea was bad — they run out of cash before the idea has time to work. Knowing your total funding need before you sign a lease is the single most useful number in a business plan. This calculator adds up what it costs to open the doors, funds a chosen number of months of operations, adds a contingency, and compares the total with the money you already have.
How to use the startup costs calculator
- List your one-time startup costs, one per line with the amount at the end — for example
Espresso machine 12,500. - List your monthly operating expenses the same way: rent, payroll, utilities, insurance, software, marketing, loan payments.
- Choose how many months of expenses to fund before the business supports itself.
- Optionally enter expected monthly revenue during that period — be conservative.
- Set a contingency percentage and enter the funding you already have to see the gap.
Startup funding formula
Worked example
A small café plans $30,700 of one-time costs (inventory, equipment, deposit, branding, legal fees, permits and launch marketing). Running costs are $11,250 a month, and the owner expects about $2,000 a month of sales while building a customer base. She wants six months of runway and a 15% contingency, and has $40,000 saved.
Monthly burn = 11,250 − 2,000 = $9,250 → reserve = 9,250 × 6 = $55,500
Subtotal = 30,700 + 55,500 = $86,200; contingency = 15% × 86,200 = $12,930
Funding needed = $99,130
Funding gap = 99,130 − 40,000 = $59,130; after opening, her savings cover only about one month of burn
That result points to the real decision: raise or borrow roughly $60,000, trim the plan, or find a way to open with lower fixed costs.
Costs that are easy to forget
| Category | Examples |
|---|---|
| Before opening | Build-out, permits and inspections, professional fees, signage, deposits on utilities |
| Inventory and supplies | Opening stock, packaging, small tools, uniforms |
| Technology | Point-of-sale hardware, software subscriptions, domain and website hosting |
| People | Hiring, training, payroll before revenue arrives, employer payroll taxes |
| Financial | Business insurance, bank and card-processing fees, loan interest |
| Owner’s pay | What you need to live on if the business is your only income |
If you plan to hire, the employee cost calculator shows what a salary really costs once payroll taxes and benefits are added.
Startup costs and taxes
The IRS distinguishes start-up costs (such as market research, advertising before opening and training) from equipment and inventory. Under the start-up cost rules, you may elect to deduct up to $5,000 in the year the business begins, reduced by the amount total start-up costs exceed $50,000, and amortize the rest over 180 months. Organizational costs for forming a corporation or partnership get a separate, similar allowance. Equipment is usually depreciated, and inventory is deducted as it is sold. A tax professional can help classify each item.
Once you know your costs, the break-even calculator shows how many sales you need to cover them, and the loan calculator prices any financing.
These figures are planning estimates, not financial, legal or tax advice. Get written quotes for large items and revisit the budget as plans change.
Frequently asked questions
How do I estimate the cost of starting a business?
Split costs into one-time expenses you pay before or at opening — equipment, deposits, legal fees, initial inventory, branding — and monthly operating expenses such as rent, payroll and insurance. Fund the one-time costs plus several months of operating expenses, and add a contingency for surprises.
How many months of expenses should I have before launching?
It depends on how quickly the business can bring in revenue. Many planners use six months as a starting point; businesses with long sales cycles, build-outs or seasonal demand often need more. Entering a cautious revenue estimate shows how much it shortens the runway you need.
What is a burn rate?
Burn rate is how much cash a business loses each month: operating expenses minus revenue. Dividing the cash left after opening costs by the burn rate tells you how many months the business can run before it needs more money or must break even.
Are startup costs tax deductible?
Partly. IRS rules let you elect to deduct up to $5,000 of start-up costs in the year the business begins, reduced dollar for dollar once total start-up costs exceed $50,000; the rest is amortized over 180 months. Equipment is generally depreciated instead, and inventory is recovered through cost of goods sold.