What is a fixed cost?

A fixed cost is a business expense that stays the same over a set period, no matter how much you produce or sell. If your shop rent is €2,000 a month, you pay €2,000 whether it’s your busiest month or your quietest.

You’ll also see fixed costs called fixed expenditure or overheads, and accountants often class them as indirect costs. Some overhead costs are variable, though, such as an electricity bill that climbs as you get busier.

Characteristics of fixed costs

Fixed costs share a handful of traits that set them apart from the rest of your spending. Use them to spot which costs in your accounts are truly fixed.

They’re set for a period, such as a month or a year
They stay constant only within a relevant range, the level of activity your current setup can handle
They’re still due when your sales are zero
They’re predictable, so they’re easier to plan for
They can change when a lease or insurance policy comes up for renewal

Examples of fixed costs

Most small businesses in Ireland pay a similar set of fixed costs. These are the ones you’re most likely to find in your accounts.

Rent or lease payments for your premises or equipment
Insurance premiums for public liability, employer’s liability and property cover, paid monthly or annually
Salaries for permanent staff, which stay the same whatever your sales
Loan repayments and interest paid on a fixed schedule
Software subscriptions billed at a flat monthly or annual fee
Depreciation, which spreads the cost of equipment or vehicles over their useful life
Commercial rates, the annual charge your local authority levies on the occupier of commercial property, based on its rateable valuation
Licences you renew on a set cycle, such as a liquor licence for a pub or restaurant

Commercial rates apply to tenants as well as owners. Local government guidance on business rates explains that the occupier pays. Your bill is the property’s rateable valuation multiplied by the Annual Rate on Valuation (ARV) your local authority sets.

Fixed costs vs variable costs

Fixed costs stay the same when your sales change, while variable costs rise and fall with every sale you make. Here’s how the two compare.

Fixed costs stay level as output changes; variable costs move in step with it
Fixed costs include rent and salaries; variable costs include raw materials and sales commissions
Fixed cost per unit falls as you sell more; variable cost per unit stays roughly the same
Fixed costs are easy to forecast; variable costs depend on how busy you are

A quick test helps you sort them: imagine you sell nothing for a month. Any cost you’d still have to pay is fixed, and any cost that disappears is variable.

Some costs sit in between. Semi-variable, or mixed, costs have a fixed base plus a usage charge. A phone plan with a flat monthly fee and extra data charges is one example, and an electricity bill with a standing charge is another.

How to calculate fixed costs

You can work out your fixed costs in a few minutes using your bank statements or accounting software. Follow these steps.

Choose a period, such as a month or a quarter
List every expense you paid in that period
Separate the costs that don’t change with sales from those that do
Add up the fixed costs to get your total

Total fixed costs

The simplest method adds up each fixed cost for the period. The formula is:

Total fixed costs = rent + insurance + salaries + loan repayments + subscriptions + other fixed costs

Say your monthly rent is €2,000, insurance is €500, salaries are €8,000 and software subscriptions are €300. Your total fixed costs are €2,000 + €500 + €8,000 + €300 = €10,800 a month.

Fixed costs from total costs

If you know your total costs and your variable cost per unit, you can work backwards. This helps when your records don’t split costs neatly. The formula is:

Fixed costs = total costs − (variable cost per unit × number of units)

Say your total costs for the month are €15,800 and you sold 1,000 units at a variable cost of €5 each. Your variable costs are €5 × 1,000 = €5,000, so your fixed costs are €15,800 − €5,000 = €10,800.

Fixed cost per unit

Fixed cost per unit shows how much of your fixed costs each product or service has to cover. Divide your total fixed costs by the number of units you produce.

Fixed cost per unit = total fixed costs ÷ number of units

Using the example above, €10,800 ÷ 1,000 units = €10.80 per unit. At 2,000 units it falls to €5.40, because the same fixed costs are spread across more sales.

Why fixed costs matter for your business

Your fixed costs set the minimum you need to earn each month. That figure shapes how you plan ahead and how you price.

Budgeting and predictability

Fixed costs are the easiest part of your budget to forecast, because you know what’s coming. They give you a solid base for forecasting your cash flow.

When sales dip for a month or two, your fixed costs still fall due in full. Knowing that total lets you set a cash buffer and spot early when a quiet spell is starting to squeeze your bank balance.

Break-even analysis

Your break-even point is the level of sales where your revenue covers all your costs. The higher your fixed costs, the more you need to sell before you make a profit.

Keeping startup and fixed costs low is one of the quickest ways to bring your break-even point forward.

Pricing decisions

Your prices need to cover your fixed cost per unit as well as your variable cost per unit. What’s left from each sale after variable costs is your contribution margin, which pays off your fixed costs first and then becomes profit.

In the earlier example, each unit carries €10.80 of fixed cost and €5 of variable cost. At 1,000 units a month, you’d need to charge more than €15.80 to make a profit.

Operating gearing

Operating gearing describes how sharply your profit reacts when sales change. A business with a higher share of fixed costs sees profit swing more when sales rise or fall.

Once your fixed costs are covered, each extra sale adds more to profit, because only its variable cost comes out. That’s why your profit margin can widen quickly as sales grow, and why a steady sales pipeline matters more when your costs are mostly fixed.

How to manage fixed costs

You often have more room to lower fixed costs than their name suggests. These four habits help you keep them in check.

Review your expenses regularly

A quarterly review helps you catch costs that have crept up and services you’ve stopped using. Go through your bank statements, and track business expenses in one place so every recurring charge is easy to see.

Negotiate with suppliers

Before a contract renews, ask your suppliers for better terms, especially if you’ve always paid on time. Discounts for paying annually or signing a longer contract are good places to start.

Consolidate tools and services

Paying for several apps that do similar jobs adds up month after month. Choose one platform that covers more of what you need, and cancel the overlaps.

Consider flexible arrangements

Flexible options turn some fixed costs into costs that move with your needs. A co-working space or a pay-as-you-go plan means you pay for what you use each month.

Track your fixed costs with Xero

Once you know your fixed costs, you can price with confidence and plan ahead for quieter months. Xero keeps those numbers up to date for you.

With Xero, you can track expenses as they come in and set up recurring bills for regular costs like rent. You can also run reports and compare your spending against your budget in real time. Explore Xero plans and get one month free.

FAQs on fixed costs

Here are quick answers to common questions about fixed costs.

Can a fixed cost become a variable cost?

Yes. If you swap a salaried role for a freelancer paid per project, or move to usage-based software, that cost starts moving with your workload.

What are stepped fixed costs?

Stepped fixed costs stay flat up to a certain level of activity, then jump to a new fixed level. For example, renting a second warehouse when you run out of space adds a new rent bill that then stays fixed again.

How do fixed costs affect profit margins?

When sales are low, fixed costs take a bigger share of your revenue, so your margins look thinner. Cutting a fixed cost lifts your margin across all your sales at once.

What’s the difference between direct and indirect costs?

Direct costs link to a specific product or job, such as materials, while indirect costs, like rent, support the whole business. Most fixed costs are indirect, but not all indirect costs are fixed: a utility bill is indirect and still varies with use.

Can fixed costs change?

Yes. “Fixed” means a cost doesn’t move with output, so it can still rise at a rent review or step up as you grow; update your break-even figure after each change.

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Disclaimer

This glossary is for small business owners. The definitions are written with their requirements in mind. More detailed definitions can be found in accounting textbooks or from an accounting professional. Xero does not provide accounting, tax, business or legal advice.

What is a fixed cost?

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