Total fixed cost is the sum of all expenses that stay the same no matter how much you produce or sell
Fixed costs are the bills your business pays whether you make one unit or one thousand units. Rent, salaries, insurance, and equipment leases do not change based on production volume. To find your total fixed cost, you list every expense that remains constant over a set period — usually one month or one year — and add them together.
The math itself is straightforward: identify which costs are fixed, write down the dollar amount for each, and add them up. The harder part is knowing which expenses count as fixed and which do not. A cost is fixed if you would still owe it even if your business produced nothing that month.
Key Takeaways
- Fixed costs stay the same each month regardless of how many products you make or sell, while variable costs change with production volume.
- Common fixed costs include rent or mortgage, salaried employee wages, insurance premiums, loan payments, and equipment depreciation.
- To calculate total fixed cost, list every expense that does not change with output, then add all amounts together for your chosen time period.
- Knowing your total fixed cost helps you set prices, plan budgets, and understand how much revenue you need just to break even.
The difference between fixed and variable costs
A variable cost changes when your output changes. If you run a bakery, flour and eggs are variable costs — you buy more when you bake more loaves. If you make fewer loaves, you buy less flour. Fixed costs do not work that way.
Your bakery's rent is the same whether you bake 100 loaves or 500 loaves that month. Your manager's salary does not drop if sales are slow. These stay fixed. The distinction matters because fixed costs are what you owe even in a bad month, and they determine your break-even point — the sales level where revenue covers all your costs.
Some costs blur the line. A utility bill might be partly fixed (the base charge) and partly variable (usage charges). For total fixed cost, count only the portion that does not change with production.
Common fixed costs to include in your calculation
Start with rent or mortgage on your building or workspace. This amount is set by your lease or loan and does not move month to month. If you own the building, include the monthly mortgage payment, not the full property value.
Add salaried employee wages. If you pay someone $3,000 per month whether business is booming or slow, that $3,000 is a fixed cost. Hourly wages are usually variable because you pay more hours when you produce more, but some businesses keep a core staff at minimum hours — count only the may provide minimum as fixed.
Include insurance premiums — liability, property, workers' compensation, or vehicle insurance. These are billed monthly or annually at a set rate. Add loan payments on equipment, vehicles, or business lines of credit. The monthly payment stays the same for the life of the loan.
Count equipment depreciation if you track it on your books. This is an accounting entry that spreads the cost of a machine or vehicle across its useful life. If you bought a $12,000 printer with a five-year life, you might record $200 per month as depreciation — that $200 is fixed. Also include subscriptions and licenses — software subscriptions, professional licenses, permits — anything billed at a set rate each period.
Step-by-step calculation with an example
Suppose you run a small graphic design studio. Here is how you would calculate total fixed cost for one month:
| Expense | Amount |
|---|---|
| Office rent | $1,200 |
| Your salary (owner, salaried) | $2,500 |
| Designer salary (full-time employee) | $2,000 |
| Business insurance | $150 |
| Equipment loan payment | $300 |
| Software subscriptions (design tools, accounting) | $80 |
| Internet and phone | $100 |
| Total Fixed Cost | $6,330 |
This studio must bring in at least $6,330 in revenue each month just to cover fixed costs, before paying for any variable expenses like freelance contractors, stock images, or printing. If the studio only earns $5,000 in a slow month, it still owes the full $6,330 in fixed costs.
Why total fixed cost matters for your business decisions
Knowing your total fixed cost tells you the minimum revenue you need to survive. Divide total fixed cost by your average profit margin per sale, and you know how many sales you must make each month. If your studio has $6,330 in fixed costs and earns $500 profit per project, you need at least 13 projects per month to break even.
Total fixed cost also shapes pricing. You cannot price so low that you cannot cover fixed costs across your expected sales volume. It informs hiring decisions — adding a salaried employee raises your fixed cost permanently, so you must be confident sales will cover it. It guides budget planning: if you know fixed costs are $6,330, you can forecast cash flow and plan for slow months.
Lenders and investors also look at fixed costs. A business with high fixed costs is riskier in a downturn because those costs do not shrink. Understanding and communicating your fixed costs shows you have thought through your financial structure.
Common mistakes when calculating total fixed cost
The biggest mistake is including variable costs. Office supplies, shipping, raw materials, and freelance labor change with output — do not add them to total fixed cost. Another error is forgetting costs that feel small. A $30 monthly software subscription or a $50 professional membership adds up across twelve months and belongs in the calculation.
Some people include one-time costs by accident. If you bought a $5,000 computer this month, do not add $5,000 to fixed cost. Instead, spread it across its useful life as depreciation — perhaps $100 per month over five years. Also avoid double-counting: if you record equipment depreciation, do not also record the loan payment on the same equipment.
Finally, do not confuse total fixed cost with average fixed cost per unit. Total fixed cost is your lump sum. Average fixed cost per unit is total fixed cost divided by the number of units you produce — it shrinks as you produce more, which is why high-volume producers have an advantage.
Frequently Asked Questions
Is my salary a fixed cost if I am the owner?
Yes, if you pay yourself a set amount each month. Owner salary is a fixed cost. However, if you take variable draws based on profit, that is not a fixed cost — it changes with business performance. Most accountants recommend setting yourself a regular salary to make fixed costs predictable.
Should I include utilities in total fixed cost?
Only the fixed portion. Most utility bills have a base charge that stays the same and a usage charge that varies. Count the base charge as fixed. If your bill is always between $200 and $300 depending on the season, use an average base amount or your lowest month as the fixed portion.
What if I lease equipment instead of owning it?
Equipment lease payments are fixed costs. The monthly payment is set by the lease agreement and does not change based on how much you use the equipment. Record the full monthly payment as fixed cost.
How often should I recalculate total fixed cost?
Recalculate whenever a fixed cost changes — when you renew a lease, hire or fire a salaried employee, take out a loan, or cancel a subscription. At minimum, review it once per year during budget planning. Tracking changes helps you spot cost creep and plan for growth.