Opex vs capex
See how opex and capex differ for Hong Kong small businesses, from tax treatment to cash flow and when to use each.
November 2023 | Published by Xero
Published Thursday 6 August 2026
Table of contents
Key takeaways
- Opex covers your day-to-day running costs like wages, rent and utilities, while capex refers to longer-term investments in assets like equipment, property or vehicles.
- For profits tax in Hong Kong, opex is usually deducted in full in the year you spend it, while capex is relieved gradually through depreciation allowances rather than deducted straight away.
- Choosing between opex and capex affects your cash flow, tax position and financial statements, so it is worth understanding the trade-offs before committing to a large purchase or subscription.
- Cloud-based software and leasing arrangements make it easier for small businesses to shift spending from capex to opex, keeping more cash available month to month.
What is opex (operating expenditure)?
Operating expenditure (opex) is the money you spend to keep your business running on a daily basis. These are the recurring costs that do not result in a long-term asset on your balance sheet.
Common examples of opex include wages and salaries, office rent, utility bills, insurance premiums, marketing spend and office supplies. Many of these are your business overheads, and if you are paying for something that gets used up within the financial year, it is almost certainly opex.
Opex shows up on your profit and loss statement (also called an income statement) as an expense in the period you incur it. It also flows through your cash flow statement, giving you a clear picture of how much cash leaves the business each month.
It is worth noting that cost of goods sold (COGS) is technically a separate line item from operating expenses on your profit and loss statement. COGS covers the direct costs of producing what you sell, while opex covers the broader costs of running the business.
What is capex (capital expenditure)?
Capital expenditure (capex) is the money you spend on assets that will benefit your business over a longer period, typically more than one year. These purchases appear on your balance sheet as fixed assets rather than being expensed immediately.
Typical capex includes machinery, commercial property, company vehicles, computer hardware and major technology systems. If an item has a useful life beyond the current financial year and adds lasting value, it is likely capex.
There are two broad types of capex to be aware of. Maintenance capex covers spending to keep existing assets in working order, like replacing a worn-out component in a machine. Growth capex covers new investments that expand your capacity, such as buying additional equipment or fitting out a second premises.
Because capex assets deliver value over multiple years, you do not deduct the full cost in the year of purchase. Instead, the cost is spread across the asset's useful life through depreciation. Each year, a portion of the asset's value moves from the balance sheet to the profit and loss statement as a depreciation expense.
Key differences between opex and capex
While both opex and capex represent money leaving your business, they are treated very differently in your accounts and tax returns. Here is how they compare across four key areas.
Time horizon
Opex covers short-term, recurring costs that are consumed within the financial year. Capex involves longer-term investments in assets you will use for several years. This distinction drives how each type of spending is recorded and reported.
Impact on profitability
Opex reduces your reported profit in the period you spend it, since the full amount appears on your profit and loss statement straight away. Capex only reduces profit gradually through annual depreciation charges, so a large capital purchase will not wipe out your profit in a single year.
Flexibility and timing
Operating expenses tend to be more flexible. You can often scale them up or down relatively quickly, for example by adjusting your marketing budget or renegotiating a service contract. Capital expenditure usually involves a larger upfront commitment that locks in spending for years, making it harder to reverse if circumstances change.
Predictability
Many operating expenses are predictable month to month: rent, salaries, subscriptions and utility bills follow a regular pattern. Capital expenditure is often irregular and harder to forecast, since it depends on when assets need replacing or when growth opportunities arise.
Pros and cons of opex and capex
Neither approach is better in every situation. Weighing the advantages and drawbacks of each helps you match your spending to your cash position and growth plans.
Handy Resources
Advisor directory
You can search for experts in our advisor directory
Up-to-date reports from Xero
Get your opex and capex numbers at the click of a mouse
Want to grow your busness?
Get a free business plan template to help map your path to success
Advantages and drawbacks of opex
Opex suits businesses that value flexibility and steady cash flow. Its main pros and cons include:
- Preserves cash, since you pay in smaller, regular amounts rather than one large sum
- Scales up or down quickly as your needs change
- Reduces taxable profit in the same year you spend it
- Costs more over the long run for something you use for many years
- Offers less control than owning an asset outright, for example with a leased or subscription service
Advantages and drawbacks of capex
Capex suits businesses investing in assets they expect to use for years. Its main pros and cons include:
- Builds owned assets that can be cheaper over the full life of the asset
- Attracts depreciation allowances that reduce your profits tax over time
- Gives you full control over the asset
- Ties up a large amount of cash upfront
- Locks in spending that is harder to reverse if your plans change
How opex and capex affect cash flow
Cash flow is often the deciding factor for a small business, so it helps to see how each type of spending hits your bank balance. Opex and capex affect the timing of cash out very differently.
Opex spreads cash outflows evenly across the year, which keeps your cash flow steadier and easier to plan around. Capex front-loads a large payment, which can strain cash in the short term even though the asset delivers value for years. That is why a business with limited cash reserves often leans towards opex, while a business with strong reserves or access to financing may be comfortable funding capex.
How opex and capex are treated for tax and accounting in Hong Kong
The way you account for opex and capex affects both your financial statements and your profits tax position, so it is useful to understand the basics. Hong Kong has no VAT, GST or sales tax; businesses pay profits tax to the Inland Revenue Department (IRD) on profits arising in or derived from Hong Kong.
Operating expenses are recorded on your profit and loss statement in the period they occur. Under section 16 of the Inland Revenue Ordinance, outgoings and expenses incurred in producing your assessable profits are generally deductible, which reduces your profits tax in the same year.
Capital expenditure works differently. The asset goes onto your balance sheet at its purchase price, and its cost is gradually expensed through depreciation over the asset's useful life. For profits tax, the IRD does not follow accounting depreciation. Expenditure of a capital nature is not deductible under section 17, but plant and machinery qualifies for depreciation allowances instead.
For plant and machinery, you can claim a 60% initial allowance in the year of purchase, followed by annual allowances of 10%, 20% or 30% on the reducing value, depending on the asset pool set by the Board of Inland Revenue. Buildings are treated separately: a commercial building attracts a 4% annual allowance, while an industrial building attracts a 20% initial allowance plus 4% a year. Unlike the United Kingdom, Hong Kong has no Annual Investment Allowance, so it is worth checking the current rules on the IRD website as details can change.
On the accounting side, financial statements in Hong Kong follow the Hong Kong Financial Reporting Standards and Hong Kong Accounting Standards issued by the HKICPA. Property, plant and equipment is governed by HKAS 16, which is based on the international standard IAS 16, and smaller companies may use the simpler SME-FRF and SME-FRS framework. Getting the classification right matters: if you treat a capital purchase as an operating expense, or the reverse, your financial statements will not give an accurate picture of the business and you could pay the wrong amount of tax.
How to calculate opex and capex
Calculating your operating and capital expenditure does not require complicated maths, but it helps to know the standard formulas.
To calculate opex, add up all your operating costs for the period, including rent, wages, utilities, insurance, marketing and any other day-to-day business expenses. The formula is straightforward:
OpEx = total operating costs for the period
You will find this figure on your profit and loss statement, either as a single total or broken down by category.
Calculating capex from your financial statements uses this formula:
CapEx = PP&E (current period) − PP&E (prior period) + depreciation
PP&E stands for property, plant and equipment, which you will find on your balance sheet. By taking the change in PP&E and adding back the depreciation charged during the period, you arrive at the total amount spent on new capital assets.
When to choose opex vs capex
The choice between opex and capex is not always clear-cut, and the right answer depends on your business's cash flow, growth plans and risk appetite.
Opex gives you flexibility. Monthly or annual subscriptions, leasing arrangements and pay-as-you-go services keep your cash flow steady and let you adjust spending quickly if conditions change. This is why many small businesses now choose cloud-based software (an operating expense) over traditional on-premises systems (a capital expense).
Capex makes sense when you need an asset that will deliver value for years and you have the cash, or financing, to cover the upfront cost. Owning equipment outright can be cheaper in the long run, and you may benefit from depreciation allowances that reduce your profits tax.
You can also convert would-be capex into opex when it suits your cash position. Leasing equipment instead of buying it, or switching from on-premises software to a cloud subscription, turns a large one-off purchase into a manageable running cost. In practice, most small businesses use a mix of both. You might lease your office space (opex) but purchase specialist tools or machinery (capex), and you can look for ways to reduce your operating costs at the same time. The key is to weigh up the total cost of ownership, the impact on your cash flow and how each option affects your tax position before making a commitment.
Track your business spending with Xero
Whether you are managing day-to-day operating costs or tracking the depreciation on a major purchase, clear visibility over your spending makes it easier to plan ahead and stay on top of your tax obligations. Xero accounting software lets you categorise expenses, monitor cash flow in real time and pull the reports you need at tax time. See how it fits your business and get one month free.
FAQs on opex vs capex
Here are answers to some frequently asked questions about opex vs capex.
Is software capex or opex?
It depends on how you acquire it. Cloud-based software paid for through a monthly or annual subscription is treated as opex, while software you buy outright and install on your own hardware is typically capex and depreciated over its useful life.
Can you convert capex to opex?
Yes, in many cases. Leasing an asset instead of buying it, or switching from on-premises software to a cloud subscription, effectively converts what would have been capex into opex, which can free up cash and simplify your accounting.
Which is better for a small business, capex or opex?
Neither is inherently better. Opex offers flexibility and preserves cash flow, while capex can be more cost-effective over time and may qualify for depreciation allowances, so the best approach depends on your financial situation and growth plans.
How are capex and opex reported on financial statements?
Opex appears on your profit and loss statement as an expense in the period it is incurred. Capex is recorded on the balance sheet as a fixed asset and then gradually expensed through depreciation over the asset's useful life.
Is depreciation capex or opex?
Depreciation is neither; it is the accounting method used to spread the cost of a capex asset across its useful life. The depreciation charge appears as an expense on your profit and loss statement each year.
Related terms
Learn more about opex and capex
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.