Allowable expenses, mileage, home-boarding rules, cash income, National Insurance, VAT and MTD explained for UK self-employed pet sitters and dog walkers.
Pet sitting looks like one of the simplest trades to run, and in many ways it is: low startup cost, no premises, and word-of-mouth clients in your own neighbourhood. But that simplicity hides the thing that trips sitters up at tax time. The money comes in small, frequent and often in cash, a tenner here for a lunchtime walk, fifty for a weekend of drop-in visits, a bank transfer for a fortnight of holiday boarding. When income arrives that way it is dangerously easy to lose track of, and HMRC treats unrecorded cash exactly the same as any other income.
This guide is built around how pet sitters actually earn and spend: lots of small jobs, heavy mileage between clients, kit that wears out fast, and the home-boarding rules that change your tax picture entirely. Get into the habit of logging every job and every mile as it happens, and your annual return becomes a quick tidy-up rather than a scramble.
As a sole trader you pay Income Tax on your profit, which is everything you take from sitting, walking and boarding minus your allowable expenses. For 2025/26 the personal allowance covers the first GBP 12,570, then you pay 20% to GBP 50,270, 40% to GBP 125,140 and 45% above, with the personal allowance tapering away between GBP 100,000 and GBP 125,140. Class 4 National Insurance is 6% on profit between GBP 12,570 and GBP 50,270 and 2% above, with Class 2 NIC settled through Self Assessment, which keeps your state pension record ticking over.
Scottish pet sitters pay Scottish Income Tax through six bands (19%, 20%, 21%, 42%, 45% and a 48% top rate) and carry an S-prefixed tax code, while National Insurance stays UK-wide. Welsh sitters have a C-coded tax code at rates currently matching the rest of the UK. If you also have a part-time PAYE job, perhaps doing this around employed work, a wrong code can quietly cost you, so run it through the tax code checker.
Most pet sitters start small, walking a neighbour's dog or covering holidays for a few local families. The GBP 1,000 trading allowance is built for exactly this. If your gross self-employed income from all your pet care work is GBP 1,000 or less in a tax year, it is tax-free and you do not need to register for Self Assessment. Cross GBP 1,000 and you must register and report the full amount, including every cash job.
Above the threshold you choose each year. You can deduct the flat GBP 1,000 trading allowance instead of working out actual expenses, which suits a walker with barely any costs. Or you can deduct your real allowable expenses if they total more than GBP 1,000, which is common once mileage and insurance are in the mix. You cannot do both, so add up your costs and pick whichever leaves the lower profit. A sitter doing high mileage across a rural area usually beats the GBP 1,000 easily once the miles are counted.
The defining cost of dog walking and pet visiting is driving. You criss-cross town between client homes, drive to off-lead parks, and shuttle dogs to boarding. Most sitters use HMRC's simplified mileage method rather than working out actual vehicle costs.
The flat rate is 45p per business mile for the first 10,000 miles in a tax year, then 25p per mile above that. It covers fuel, servicing, insurance, tax and wear and tear, so if you use it you cannot also claim those running costs separately. The alternative is the actual-cost method, where you claim the business proportion of every motoring bill, which can win for an expensive vehicle but needs far more record-keeping. For most sitters the flat rate is simpler and generous.
The discipline that matters is the log. Record every business journey with the date, where you went and the miles, ideally as you go. Driving from home, which is your business base, to a client or a regular walking spot counts as business mileage; a genuine personal detour does not. Put your real figures through the sole trader tax calculator to see how mileage cuts the bill.
An expense is allowable when incurred wholly and exclusively for the business. Beyond mileage, a sitter's list is dominated by kit, insurance and compliance costs.
| Expense | What qualifies | Notes |
|---|---|---|
| Mileage or vehicle costs | 45p/25p per business mile, or actual running-cost proportion | Pick one method and stay consistent within the year |
| Pet care equipment | Leads, harnesses, slip leads, poo bags, treats, toys, water bowls used for clients | Items used for your own pets are not allowable |
| Insurance | Public liability, care/custody/control, key cover, equipment cover | A core cost for any professional sitter |
| DBS and checks | Enhanced DBS, ID and reference checks clients expect | Allowable where required to trade |
| Training and qualifications | Canine first aid, animal care courses, behaviour CPD | Courses that develop your existing trade |
| Licence fees | Home-boarding or day-care licence from the local council | Mandatory for boarding in your home |
| Phone and broadband | Business proportion of your bills for bookings and client contact | Exclude the private share |
| Software and apps | Booking, scheduling, GPS-tracking and invoicing app fees | Subscriptions fully deductible |
| Advertising and website | Local ads, flyers, directory listings, website and domain | Fully deductible running costs |
| Accountancy and bank fees | Bookkeeping, Self Assessment, business banking | Fully deductible |
Boarding dogs or cats in your own home changes your tax picture in two ways. First, you usually need a licence from your local council under the Animal Welfare (Licensing of Activities Involving Animals) Regulations, and that fee is an allowable expense. Second, because you are using your home for the business, you can claim a fair proportion of household running costs, heat, light, water and a share of rent or mortgage interest, based on the rooms and time given over to boarding. You can also claim crates, bedding, baby gates, extra cleaning and waste disposal that exist for the boarders. The line you must not cross is your own pets: their food, vet bills and kit are personal, never business, and only the genuine business share of any dual-use cost is allowable.
Everyday clothing is not allowable even if you buy sturdy wet-weather gear for walks, though branded uniform or genuine protective equipment can be. The private share of your phone, broadband and vehicle must be stripped out. Your own pets' costs are personal. And ordinary commuting, if you ever had a fixed work base, would not count, though for a home-based sitter almost all driving is genuinely business.
Because so much pet sitting money is cash and the jobs are small and frequent, record-keeping is the whole game. The sitter who logs every booking, every cash payment and every mile as it happens pays the right tax and sleeps easily; the one who guesses in January either overpays or risks a problem if HMRC ever asks.
A simple routine beats any clever system: note each job the day it happens with the amount, the client and whether it was cash or transfer; bank your cash regularly so your account roughly mirrors your takings; and keep the mileage log running in the same place. Keep receipts for kit, insurance, licence and training. You must hold these records for at least five years after the Self Assessment deadline. If you also juggle a PAYE job or rental income, the multiple-income tax calculator shows how the streams stack.
For a pet sitter, the tenner you forget to record costs you more than the lead you forget to claim. Log every job and every mile as it happens, and the tax return looks after itself.
Take a home-based sitter doing daily dog walks, drop-in visits and some weekend home-boarding, with GBP 26,000 of income for the year and 9,000 business miles driven.
Income: GBP 26,000 (walking GBP 12,000, drop-in visits GBP 7,000, home-boarding GBP 7,000)
Allowable expenses:
Taxable profit: GBP 26,000 minus GBP 6,900 = GBP 19,100
Income Tax: GBP 19,100 minus GBP 12,570 = GBP 6,530 at 20% = GBP 1,306
Class 4 NIC: GBP 6,530 at 6% = GBP 392
Total tax and NIC: GBP 1,698 for the year, plus Class 2 settled through Self Assessment. Notice how much the mileage alone does here, more than half the total deductions, which is exactly why the mileage log matters so much for this trade.
You must register for VAT once your taxable turnover passes GBP 90,000 in any rolling 12-month period. A solo walker rarely gets near it, but a sitter who takes on staff, runs day care or scales up boarding can, so keep an eye on the rolling figure rather than your accounting year. Because almost all pet sitting customers are private individuals who cannot reclaim VAT, registering means either adding 20% to your prices or swallowing it from your margin, so voluntary registration seldom helps a consumer-facing pet business. If you do grow past the threshold, register on time, as late registration brings penalties and a backdated VAT bill.
Making Tax Digital for Income Tax Self Assessment replaces the once-a-year return with quarterly digital submissions and a year-end finalisation. The thresholds are based on gross income, not profit:
For a pet sitter the upside is real. The lumpy, cash-heavy income that makes a year-end scramble so painful becomes far easier to handle when you record each job digitally as it happens and send HMRC a quarterly summary. Instead of reconstructing a year of small payments from memory and a messy bank statement, you keep a running tally. Our guide to MTD for sole traders walks through what the quarterly rhythm looks like in practice.
Not recording cash jobs. A cash walk or weekend of cover is taxable income exactly like a bank transfer. Log it the day it happens.
Not registering once over GBP 1,000. The trading allowance is a threshold, not a free pass. Cross it and you must register for Self Assessment, even as a sideline.
No mileage log. Mileage is often a sitter's biggest deduction, but HMRC can disallow it without a contemporaneous record. Keep the log running all year.
Claiming for your own pets. Your own animals' food, vet bills and kit are personal and never allowable, however much you also use them for demos or company.
Boarding without the licence. Home-boarding usually needs a council licence; trading without it risks penalties, and you also miss claiming the licence fee and home-use proportion.
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