TL;DR: Tax deductions reduce your taxable profit, which directly reduces your tax bill. Every jurisdiction allows broadly similar categories of business expenses, but the specific rules differ. Understanding what you can and cannot deduct — and how to document it — is one of the highest-return activities available to a small business owner.
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Many small business owners overpay tax simply because they do not claim deductions they are legally entitled to. Others create problems for themselves by claiming expenses that do not qualify. This guide maps the major deduction categories across 7 countries and explains the documentation requirements that make those claims defensible in an audit.
The general test across all jurisdictions is that an expense must be incurred wholly and exclusively (or substantially, in some jurisdictions) for business purposes to be deductible. Personal expenses are not deductible. Mixed-use expenses require apportionment.
Salaries, wages, bonuses, employer social security contributions, and pension contributions paid on behalf of employees are deductible in all jurisdictions. This is typically the largest deduction category for service businesses.
Documentation: Payroll records, payslips, pension payment records, employment contracts.
Rent, business rates/rates (UK), property tax (USA, Canada), utilities, cleaning, and maintenance of business premises are deductible.
Home office: If you work from home, a proportion of home costs (rent, mortgage interest in some jurisdictions, utilities, internet) may be deductible. Rules vary significantly — in the UK, HMRC offers a flat rate of £6/week for simplified use, while the USA allows either a simplified method (USD 5/sq ft, up to 300 sq ft) or actual expense method.
Documentation: Rental agreements, utility bills, property tax statements, floor plan calculations for home office.
Stationery, postage, computer equipment, software subscriptions, phone bills, and internet costs used for business are deductible.
Capital vs revenue distinction: Most countries distinguish between capital expenditure (assets with multi-year lives — depreciated over time) and revenue expenditure (consumed in the current period — deducted immediately). Equipment above a certain cost threshold is typically treated as capital.
Accountancy, legal, consultancy, and other professional fees paid in connection with the business are deductible. Note that fees for capital transactions (e.g., legal costs of acquiring a business) may be capital rather than revenue expenditure.
Business travel — flights, trains, hotels, and subsistence during business trips — is deductible. Commuting from home to a regular place of work is generally NOT deductible. Rules for subsistence allowances vary.
Mileage allowances (using personal vehicle for business):
| Country | Rate (approx., standard car) | Notes |
|---|---|---|
| UK | 45p per mile (first 10,000 miles), 25p thereafter | HMRC approved mileage rates |
| France | Variable by car type and km | Barème kilométrique published annually by DGFIP |
| Sweden | SEK 25 per km | Skatteverket standard rate |
| Australia | AUD 0.88 per km (2023–24) | ATO cents-per-km method |
| New Zealand | NZD 1.04 per km (Tier 1, first 14,000 km) | IRD rate |
| Canada | CAD 0.70 per km (first 5,000 km), 0.64 thereafter | CRA prescribed rates |
| USA | USD 0.67 per mile (2024) | IRS standard mileage rate |
Documentation: Mileage log with date, destination, business purpose, and odometer readings. Receipts for all actual costs.
Website costs, advertising spend, social media marketing, promotional materials, trade show attendance, and PR costs are deductible.
Distinction: Initial brand creation costs may be capital. Ongoing marketing campaigns are revenue.
Bank fees, merchant processing fees, and in most jurisdictions, interest on business loans are deductible.
Restriction (UK): Corporate interest deductibility limited to 30% of EBITDA for large businesses. Most small businesses are unaffected.
Research and Development (R&D) Tax Credits: For SMEs (companies with fewer than 500 employees and turnover ≤ €100M or balance sheet ≤ €86M), qualifying R&D expenditure generates an additional deduction.
From April 2024: SME scheme merged with RDEC. Effective credit rate for loss-making companies is 14.7%. Contact HMRC or a qualified accountant for current rates.
Annual Investment Allowance (AIA): 100% first-year deduction on qualifying plant and machinery up to £1 million. Reduces taxable profit in year of purchase rather than spreading over asset life.
Source: gov.uk/guidance/corporation-tax-research-and-development-rd-relief
Frais généraux: General business expenses deductible under standard rules.
JEI (Jeune Entreprise Innovante): R&D-intensive startups may qualify for employer social contribution exemptions alongside tax relief.
Amortissement: Capital assets depreciated at legally prescribed rates. Exceptional depreciation available for certain investments.
Source: impots.gouv.fr/portail/professionnel/professionnel-bic-deductions-charges
Periodiseringsfond: Up to 25% of taxable income can be set aside as an untaxed reserve (tax deferred for up to 6 years). Powerful tax deferral tool.
Expansionsfond: For sole traders and partnerships — up to 32.72% of equity can be allocated to this fund, reducing current year tax.
Source: skatteverket.se/foretagochorganisationer
Instant Asset Write-Off: Eligible businesses can immediately deduct the full cost of qualifying assets. Thresholds and turnover limits change — always check current ATO guidance.
R&D Tax Incentive: Refundable 43.5% tax offset for eligible companies with turnover < AUD 20M. Non-refundable 38.5% offset for larger entities.
Small Business Income Tax Offset (SBITO): For sole traders with small business income — up to AUD 1,000 offset against income tax.
Source: ato.gov.au/businesses-and-organisations/income-deductions-and-concessions
Deductions under Income Tax Act 2007: "Generally permitted deductions" section allows expenses incurred in deriving assessable income.
Loss offset provisions: Losses can be carried forward (subject to continuity of ownership) and offset against future profits.
Startup costs: Pre-trading expenditure in certain categories (e.g., market research) may be deductible in the first year of business.
Source: ird.govt.nz/income-tax/income-tax-for-businesses-and-organisations
SR&ED (Scientific Research and Experimental Development): Federal investment tax credit (ITC) of 15–35% on qualifying R&D expenditure. Canadian-Controlled Private Corporations (CCPCs) with qualifying expenditure below CAD 3M qualify for the enhanced 35% refundable credit.
Capital Cost Allowance (CCA): Depreciation of capital assets at prescribed rates (Class 10: 30% declining balance for most vehicles; Class 8: 20% for equipment).
Home Office Deduction: If home is your principal place of business, proportionate home costs are deductible.
Section 179 Expensing: Immediately expense qualifying business property up to USD 1,160,000 (2023 limit; indexed annually) rather than depreciating over asset life.
Bonus Depreciation: Additional first-year depreciation on qualifying property. 60% for 2024 (phasing down annually under TCJA).
Qualified Business Income (QBI) Deduction: Pass-through entities (sole proprietors, S-corps, partnerships) may deduct up to 20% of qualified business income, subject to income limits and W-2 wage tests.
Source: irs.gov/businesses/small-businesses-self-employed/deducting-business-expenses
Use our free tool: Cost Calculator
Try it free →Professional subscriptions: Annual membership fees for professional associations, trade bodies, or journals related to your business.
Training and development: Courses, conferences, and books that maintain or improve skills relevant to your current trade or profession. Note: costs to establish a new qualification or change careers are generally not deductible.
Software and apps: Subscription-based business tools (accounting software, project management, CRM) are revenue expenditure and immediately deductible.
Bank charges on business accounts: Monthly fees, transaction fees, and SWIFT transfer charges.
Bad debts: Invoices definitively written off as uncollectable (specific write-off required — general provision is not deductible in most jurisdictions).
Insurance premiums: Business insurance (public liability, professional indemnity, buildings, contents) is deductible.
Charitable donations: Treated differently by jurisdiction — in the UK, companies claim corporation tax relief via Gift Aid declarations; in the USA, cash donations are deductible up to 10% of taxable income for C-corps; in Australia, deductible if made to Deductible Gift Recipients (DGRs).
| Expense | Why Not Deductible |
|---|---|
| Owner's personal meals | Mixed purpose; personal element not deductible |
| Clothing (non-uniform) | Generally personal, even if worn for work |
| Commuting costs | Personal travel to regular workplace |
| Client entertainment (UK/France) | Specifically disallowed under UK/French rules |
| Capital expenditure | Must be capitalised and depreciated, not expensed immediately (absent special allowances) |
| Fines and penalties | Public policy — not deductible in any jurisdiction |
| Pre-trading expenses (in some jurisdictions) | Consult local rules — treatment varies |
Keep original receipts. Digital copies are acceptable in most jurisdictions. HMRC, ATO, IRD, and IRS all accept digital records. France requires retention of digital originals with guaranteed integrity.
Record the business purpose. On every receipt, note who was present (for meals), what was discussed (for travel), and what business purpose was served. This is essential if audited.
Separate personal from business. If you use a personal vehicle, phone, or home, calculate the business-use percentage using a consistent and defensible method (mileage log, call records, floor area ratio).
Retention periods: Keep records for at least 7 years in most jurisdictions (France: 10 years for accounting records).
The MmowW Cost Calculator helps you estimate professional fees (accountancy, tax advice) — which are themselves deductible business expenses.
The MmowW Filing Deadlines tool ensures you never miss a tax return deadline, avoiding penalties that are non-deductible.
Can I deduct my home office if I rent?
Yes, in most jurisdictions. You deduct a proportion of rent, utilities, and internet based on the floor area of the dedicated workspace relative to the total home area. The workspace must be used regularly and exclusively for business in some countries (USA, UK strict interpretation) or as a principal place of business.
Are startup costs before my business opens deductible?
Treatment varies. In the USA, up to USD 5,000 of startup costs and USD 5,000 of organisational costs are deductible in year 1, with the remainder amortised over 15 years. In the UK, pre-trading expenses incurred in the 7 years before the business starts may be deductible. In Australia, black-hole expenditure provisions allow some pre-trading costs. Consult a qualified accountant for your situation.
Can I deduct business meals with clients?
In the UK, client entertaining is specifically disallowed — even meals with clients are not deductible. In the USA, 50% of business meals are deductible (entertainment was disallowed from 2018). In Australia, 50% of meal entertainment is deductible. Rules differ significantly — check your specific jurisdiction.
Can I deduct the cost of a business vehicle?
Yes, but treatment depends on whether you buy or lease and the business-use percentage. Purchased vehicles are typically capitalised and depreciated (or written off under first-year allowances). Lease payments are generally deductible proportionate to business use. Luxury vehicles may have cost limits. Consult a qualified accountant.
What is the difference between a deduction and a tax credit?
A deduction reduces your taxable income (e.g., a USD 1,000 deduction saves USD 250 if you're in a 25% tax bracket). A tax credit directly reduces your tax bill dollar-for-dollar (a USD 1,000 credit saves USD 1,000). Credits are generally more valuable than equivalent deductions.
MmowW Scrib🐮 is a document preparation service, not a law firm. We do not provide legal advice.
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