Allowable Expenses for Sole Traders in Ireland: What You Can (and Can’t) Claim in 2026

At a Glance: What You Can and Can’t Claim

Before the detail, here’s a quick-reference summary of common expense categories.

Expense	Allowable?	Conditions
Accountancy & professional fees	Yes	Must relate directly to your trade
Advertising & marketing	Yes	Wholly and exclusively for the business
Home office costs	Yes, apportioned	Only the business-use percentage
Phone & broadband	Yes, where applicable	Business-only costs may be fully deductible; mixed-use costs should be reasonably apportioned
Motor & travel	Yes, apportioned	Actual costs only — flat mileage rates don’t apply to sole traders
Software subscriptions	Yes, generally.	Where wholly and exclusively for the trade; treated as a revenue expense, not capital
Laptops, tools & equipment	Yes, via capital allowances.	12.5% per year over 8 years, not a single deduction
Pre-trading costs	Yes	Within 3 years before you started, under Section 82 TCA 1997
Client entertainment	Generally no	Not deductible, even when used for marketing purposes
Ordinary clothing	No	Only genuinely protective/specialist clothing qualifies.
Your own salary or drawings	No	Treated as profit distribution, not a cost
Commuting	No	Home to your regular place of work is never allowable.
Fines & penalties	No	Including Revenue’s own late filing surcharges

The Golden Rule: What Makes an Expense “Allowable” (Section 81 TCA 1997)

Every allowable expense in Ireland comes back to one legal test: it must be wholly and exclusively laid out for the purposes of your trade or profession. This comes directly from Section 81 TCA 1997.

“Wholly” means the entire cost relates to your business, not partly. “Exclusively” means the expense serves no other purpose, not even a secondary personal benefit. Ireland’s courts have taken this test seriously: in Fahy v Revenue Commissioners [2023] IEHC 710, the High Court disallowed a claim precisely because the expense served a dual purpose, personal as well as business.

It also helps to separate two categories of spending early, since it changes how you claim them:

• Revenue expenses are the day-to-day running costs of your business, such as rent, software, advertising, and insurance. These are deducted in full against your profit in the same year you incur them.
• Capital expenditure is different. This covers assets you buy that last beyond one year, such as a laptop, a work van, and office furniture. You can’t deduct the full cost in year one. Instead, you claim it gradually through capital allowances, which we cover in detail further down this guide.

Keep that distinction in mind as you read through the categories below; it’s the difference between claiming something all at once and claiming it over eight years.

Allowable Expenses for Sole Traders in Ireland: The Full List

Here’s a category-by-category breakdown of what typically qualifies as an allowable expense for sole traders in Ireland.

Professional & Accountancy Fees

Accountancy fees, bookkeeping costs, and fees for preparing your Form 11 are all allowable, since they’re incurred directly to run and comply with your business. Legal fees are usually allowable too, but only where they relate to your trade, as legal costs tied to buying a capital asset (like a premises) are treated as capital, not revenue expenditure.

Advertising, Marketing & Website Costs

Website design and hosting, social media advertising, business cards, signage, and marketing campaigns are all allowable. 

Rent, Rates & Office Running Costs

Rent for business premises, commercial rates, electricity, heating, and general office running costs are allowable in full if the premises is used entirely for business. If you work from home, this category needs apportionment instead; see the dedicated home office section below.

Staff Wages, Employer PRSI & Training

If you employ staff, their wages, your employer’s PRSI contributions, and job-related training costs are all allowable business expenses. This applies to your employees; it does not apply to payments you draw for yourself, which we cover under disallowed expenses.

Bank Charges, Card Fees & Loan Interest

Business bank account charges, card and merchant processing fees, and interest on loans taken out for business purposes are allowable. Keep business and personal banking separate, as mixing the two makes this category far harder to substantiate if Revenue ever asks.

Insurance

Public liability insurance, professional indemnity insurance, and business property insurance are all allowable, since they exist specifically to protect your trade.

Repairs & Maintenance

Genuine repairs (fixing what’s already there) are allowable in full as a revenue expense. But an improvement or upgrade (replacing an old kitchen with a better one in a rental property, for example, or upgrading equipment rather than repairing it) is treated as capital expenditure instead and claimed through capital allowances over time, not as a straight deduction.

Home Office Expenses for the Self-Employed

If you run your business from home, you can claim a proportion of your household running costs, but only the business-use portion, calculated on a reasonable, consistent basis.

What’s typically includable: electricity, heating, and broadband, apportioned by the space and time your home office is actually used for work.

Rent or mortgage interest is a special case. It can technically be apportioned and claimed the same way as your other home office costs, but two things make it worth extra caution. First, if you claim a portion of your mortgage interest as a business expense, you can’t also claim standard mortgage interest relief on that same portion; you have to choose one treatment, not both. Second, claiming part of your home for business use can affect your capital gains tax exemption on your home if you later sell it. For these reasons, many accountants recommend getting this specific claim checked before relying on it, rather than treating it the same as a straightforward utility bill.

Apportionment approach: One of the most common approaches is to divide the number of rooms used for work by the total number of rooms in the property, then apply that percentage to the bills.

Worked Example: Let’s assume you use 1 of the 5 rooms in your property exclusively for work purposes. That’s 20% of your home used for business. If your annual heating and electricity bill is €2,000, you can claim 20% of that €400 as a business expense.

Whatever apportionment method you use, apply the same one every year unless your circumstances genuinely change.

Phone & Broadband Expenses

Phone and broadband costs follow the same apportionment logic as home office expenses, but they trip people up often enough to deserve their own section.

If you have a dedicated business phone line or broadband contract, one used solely for work, you can generally claim the full cost. No apportionment needed, since there’s no personal use to separate out.

If you share one phone or broadband plan for both business and personal use (the more common situation for most sole traders), you need to apportion the cost fairly. The most straightforward approach is by percentage of use; for example, if roughly a third of your calls and data are genuinely business-related, you claim a third of the bill.

A few things worth knowing:

• Business-related apps or add-ons (cloud storage, professional software, international call packages) are claimable if they’re used wholly for business. Personal subscriptions on the same bill.
• Mobile data used while travelling for business is claimable as part of your normal apportionment.
• Keep a simple record of how you arrived at your business-use percentage. It doesn’t need to be complicated, but it does need to be reasonable and consistent if Revenue ever asks how you calculated it.

Motor & Travel Expenses: What You Can Actually Claim

This is one of the most commonly misunderstood expense categories for Irish sole traders, and it’s an area where accurate records and apportionment are particularly important.

The distinction that trips people up: business travel between different work locations is allowable. Ordinary commuting from home to your regular place of work is not, no matter how far you travel.

When deducting your own vehicle costs against your trading profits, you must use the actual-cost method, not a flat mileage rate. This is the single most important thing to know about claiming motor expenses in Ireland: unlike employees, self-employed people cannot use the Civil Service mileage rates to work out their own deduction. Instead, you claim the business-use proportion of your actual running costs, such as fuel, insurance, motor tax, servicing, and repairs, based on a mileage log showing business versus private use. (This applies specifically to a sole trader deducting their own vehicle running costs; it doesn’t necessarily describe every travel reimbursement arrangement you might encounter, such as recharging costs to a client under a separate agreement.)

For example, if your total annual running costs are €8,000 and 50% of your mileage was for business, you can claim €4,000. The vehicle’s purchase cost itself isn’t claimed this way at all; it’s claimed separately through capital allowances (see below), also apportioned for business use.

Subsistence while travelling for business is allowable if the cost is reasonable and accepted. Ordinary daily meals near your usual place of work are not the cost that has to relate specifically to travelling away from your normal working base.

Capital Allowances: Claiming for Equipment, Vehicles & Assets

Capital allowances are how you claim for assets that last beyond a year, like computers, furniture, tools, and commercial vehicles.

The standard rate is 12.5% per year over 8 years (known as the wear and tear allowance), claimed on a straight-line basis under Section 284 TCA 1997. So a €4,000 laptop and office setup gets you a €500 deduction each year for eight years, not a single upfront deduction. Capital allowances sit alongside but separately from the income tax, USC, and PRSI calculations covered in our self-employment tax guide.

Motor vehicle allowances depend on emissions, not just a flat cap. The €24,000 maximum qualifying cost only applies to lower-emission vehicles (CO₂ emissions up to 140 g/km). Vehicles in the next band (141–155 g/km) are capped much lower, at the lesser of 50% of cost or €12,000. Vehicles above 155 g/km CO₂ currently receive no capital allowances at all. Whatever category your vehicle falls into, that figure then gets apportioned for business use, the same way running costs are. If you’re buying a vehicle specifically to claim capital allowances on it, checking its emissions band before you commit can make a significant difference to what you’re able to claim.

Accelerated Capital Allowances (ACA) for energy-efficient equipment are worth knowing about if you’re investing in a qualifying kit. Instead of spreading the deduction over 8 years, the ACA scheme lets you deduct 100% of the cost in year one for equipment listed on SEAI’s Triple E register, including certain electric and alternative-fuel vehicles, where the accelerated allowance is based on the lower of the actual cost or €24,000. The scheme has been extended to 31 December 2030 under Budget 2026, so it’s not going anywhere soon if you’re planning a purchase.

Tools, Equipment & Software

There is more misunderstanding regarding this category of expenses than there should be, largely because two very similar items, a laptop and a software subscription, are accounted for quite differently from a tax point of view.

Physical tools and equipment, such as a laptop, camera, power tool, office furniture, and machinery, fall under capital expenditure. As mentioned above, you do not write off 100% of the cost in year one – only through capital allowance, 12.5% per annum for 8 years.

Subscription services, such as software licences for accounting software, design tools, cloud storage, and others, are usually revenue expenses. They fall under capital expenditure only if you are buying a one-time software licence rather than subscribing to it monthly or annually. In fact, software subscription is deductible in its entirety for the period it covers, just like any other revenue or expense, including rent or insurance.

The tricky part here is that you can write off a one-time software purchase as a capital expenditure if it provides a benefit to the business for more than one year.

A simple rule of thumb: if you pay for it repeatedly (monthly or annually), it’s very likely a revenue expense. If you buy it once and it lasts for years, it’s very likely a capital item.

Pre-Trading Expenses: Claiming Costs From Before You Started

Most people assume that costs incurred before their business officially started can’t be claimed. That’s not quite right.

Section 82 TCA 1997 allows you to claim pre-trading expenses incurred in the 3 years before your business commenced, provided they would have qualified as allowable had you already been trading. (Revenue’s own guidance on Section 82 confirms this 3-year lookback explicitly.) These costs are treated as if they were incurred on your very first day of trading.

Common examples include market research, business plan preparation, logo and website design, and professional set-up fees paid before you officially began trading.

This is a genuinely underused relief as many first-time sole traders don’t realise it exists and simply write off their early setup costs as a personal expense they can’t recover.

Expenses You Cannot Claim in Ireland

Just as important as knowing what you can claim is knowing what Revenue will reject every time.

• Business entertainment

This one surprises people constantly. Revenue’s position is that business entertainment expenses are generally not deductible; even when entertainment is genuinely used to win or retain business, there’s no “marketing” exception here.

• Ordinary clothing

Everyday clothes, even if you only wear them for work, are not allowable. The only exception is genuinely protective or specialist clothing that isn’t suitable for everyday wear.

• Your own salary or drawings

Money you pay yourself isn’t a business expense; it’s a distribution of profit, not a cost of earning it.

• Commuting

Ordinary travel between home and your regular place of work is never allowable, regardless of distance.

• Fines and penalties

This includes Revenue’s own surcharges and interest for late filing or late payment; you can’t deduct the cost of being late as a business expense.

Common Mistakes Sole Traders Make With Expenses

These are some common mistakes to watch out for:

• Claiming personal expenses as business costs

The most frequent issue is a family phone plan, personal groceries, or a holiday framed loosely as “research”; none of these pass the wholly-and-exclusively test, however the paperwork is worded.

• Claiming full costs instead of apportioning

Home office bills, phone and broadband, and motor expenses all need a business-use percentage applied. Claiming 100% of a mixed-use cost is one of the easiest mistakes to make and one of the easiest for Revenue to challenge.

• Treating commuting as a business expense

Ordinary travel from home to your regular place of work doesn’t become deductible just because you’re self-employed rather than employed.

• Including business entertainment under “marketing”.

 As covered above, this is generally not an accepted exception, no matter how the expense is framed or documented.

• Mixing personal and business banking

Using one account for both makes every other mistake on this list harder to spot and harder to defend if Revenue ever asks for evidence.

• Switching apportionment methods without a reason

Changing how you calculate your home office or motor percentage every year, with no genuine change in circumstances, is exactly the kind of situation where accurate records and a consistent method are particularly important.

Allowable Expenses and Self-Assessment in Ireland

Expenses don’t exist in isolation; everything covered in this guide ultimately feeds into your annual self-assessment tax return.

Every allowable expense you correctly claim reduces your taxable profit, which in turn reduces your income tax, USC, and PRSI liability for the year; this is exactly what our worked example further down shows in real euro terms. Get your expenses right, and the rest of your self-assessment return becomes noticeably more straightforward.

There’s a second, less obvious reason expenses matter for self-assessment: your preliminary tax payment, due alongside your Form 11 each year, is based on an estimate of your current-year liability. If your expense claims are inaccurate, whether under-claimed or over-claimed, that estimate is thrown off too, which can affect whether you meet the “safe harbour” rules covered in our self-assessment guide.

For sole traders who also handle their own day-to-day bookkeeping, keeping expense categories clean throughout the year, rather than reconstructing them at filing time, makes this whole process considerably less stressful. This is one of the main reasons many sole traders eventually move to outsourced bookkeeping support once their transaction volume grows.

Where Do These Expenses Go on Your Form 11?

Knowing what you can claim is only half the job; you also need to know where it actually lands on the return. This is where most first-time filers get stuck.

Think of the Form 11 as a series of lettered sections, called panels, each covering a different type of income or information. You won’t touch most of them as a sole trader with straightforward self-employment income; you can safely leave those blank.

The panel that matters most for expenses is Panel B. This is where self-employed trading income and expenses are entered, specifically in a subsection called “Extract from Accounts”. Here, you’re not uploading your full accounts or attaching receipts; you’re transcribing summary figures: your turnover, your purchases, and your expense categories, which together produce your net profit figure.

Capital allowances are entered separately, below the profit line, not mixed in with your day-to-day revenue expenses in the Extract from Accounts panel. This matters because it means your revenue expenses and your capital allowances follow two different claim mechanics on the same form, even though both reduce your final tax bill.

A simple way to think about it: if it’s a cost you’d claim in full this year (rent, insurance, a software subscription), it goes in the Extract from Accounts section. If it’s an asset you’ve been claiming over several years (a laptop, a van), it goes in the capital allowances section instead.

As Form 11 panel layouts can shift slightly year to year, always check your figures against the current-year form before submitting or have a professional confirm the mapping for you.

Example: How Much Tax Do Allowable Expenses Actually Save You?

Numbers make this concrete. Take a self-employed graphic designer with €65,000 in gross trading income for 2026, filing as a single person with no other income.

Scenario A — expenses under-claimed (taxable profit stays at €65,000):

• Income tax: €44,000 × 20% + €21,000 × 40% = €17,200, less €4,000 in credits (Personal Tax Credit + Earned Income Tax Credit) = €13,200
• USC: approximately €1,483
• PRSI Class S (blended 2026 rate): approximately €2,754
• Total tax bill: approximately €17,437

Scenario B — €8,500 correctly claimed (taxable profit drops to €56,500):

• Income tax: €44,000 × 20% + €12,500 × 40% = €13,800, less €4,000 in credits = €9,800
• USC: approximately €1,228
• PRSI Class S: approximately €2,394
• Total tax bill: approximately €13,422

The difference: roughly €4,015, simply by correctly claiming expenses this sole trader was already legitimately entitled to. This illustrates the potential tax impact of correctly claiming eligible expenses.

(This example is illustrative, based on verified 2026 income tax bands and USC rates. PRSI Class S is charged at 4.2% until 30 September 2026 and 4.35% from 1 October 2026; because the rate changes mid-year, Revenue applies a blended rate of 4.2375% to 2026 annual income for anyone paying through the self-assessment system, which is the rate used here. It assumes no other credits, reliefs, or income sources and that reckonable income is above the €650 minimum PRSI contribution threshold. Your own figures will vary.)

Keeping the Right Records

None of the above matters if you can’t back it up. 

How long to keep records?

Hold on to every invoice, receipt, bank statement, and mileage log for at least 6 years from the end of the relevant tax year. This applies whether your records are on paper or stored digitally.

What counts as evidence:

• Invoices and receipts showing the date, amount, and what the expense was for
• Bank or card statements backing up business transactions
• A mileage log for any motor expense claim, showing business versus private use for each journey

Stick to one method. If you apportion home office costs by room count or motor expenses by mileage percentage, use that same method every year. Only change it if your actual circumstances change. Switching methods without a real reason is exactly what draws Revenue’s attention.

Why this matters beyond this year’s return. Getting your expenses wrong, even by accident, distorts your income estimate for the year. That matters if you’re relying on the 90% “safe harbour” for preliminary tax under Section 959AN TCA 1997. Get your expenses right, and preliminary tax gets easier too; we cover that in more detail in our Self-Assessment guide.

Conclusion

Every expense you claim comes back to one question: is it wholly and exclusively for your trade? Answer that honestly, category by category, and the €4,015 difference in our example isn’t a lucky outcome; it’s just what happens when you claim what you’re already entitled to.

The payoff goes beyond this year’s tax bill, too. Accurate expenses mean an accurate preliminary tax estimate, a Form 11 that holds up if Revenue ever asks questions, and one less thing to second-guess every October.

If you are unsure about mixed-use expenses, vehicle capital allowances, or costs you paid before starting your business, it is better to get them checked before filing your tax return. Get in touch with Aone Outsourcing’s self-assessment team and we’ll go through your numbers with you ahead of the deadline.

Frequently Asked Questions

Q1. What expenses can a sole trader claim in Ireland? 

Any cost that’s wholly and exclusively for your trade, like accountancy fees, advertising, business insurance, a proportion of home office running costs, staff wages, bank charges, and the business-use portion of motor and travel costs. Capital items like equipment and vehicles are claimed separately through capital allowances rather than as a direct deduction.

Q2. Can I claim my phone bill as a sole trader in Ireland? 

Yes, but only the business-use portion. If you use the same phone for personal and business calls, you need to apportion the bill reasonably between the two; claiming 100% of a phone you also use personally isn’t wholly and exclusively for your trade.

Q3. Can I claim my car as a business expense in Ireland? 

Not as a single upfront cost. You claim the business-use share of your running costs based on your records. The purchase price is treated separately through capital allowances, and how much qualifies depends on the car’s CO₂ emissions, so the €24,000 figure isn’t a blanket limit; it only applies to lower-emissions vehicles. Sole traders also can’t use the flat civil service mileage rate; that’s for employees only.

Q4. What happens if I claim an expense I shouldn’t have? 

If Revenue queries or disallows a claimed expense, you’ll typically owe the extra tax due, plus interest for the period it was outstanding. If the error appears deliberate rather than a genuine mistake, penalties can apply on top. This is exactly why keeping clear, contemporaneous records matters; a genuine mistake backed by reasonable evidence is treated very differently from an unsupported or careless claim.

Q5. Do I need a receipt for every expense I claim? 

Yes. Keep invoices, receipts, bank statements, and (for motor expenses) a mileage log for at least 6 years, so your claim can be substantiated if your return is ever reviewed.