Working for yourself around Watford
A lot of Watford's working life happens one person at a time. Mobile hairdressers, cleaners, driving instructors, personal trainers, tutors and gardeners drive between Garston, Oxhey, Abbots Langley and Croxley Green every day. Others run a small unit or a shopfront on St Albans Road, or sell online from a spare room.
As a sole trader, you and the business are the same thing in the eyes of HMRC. There is no separate company, so the profit is simply added to your other income and taxed through your own self assessment return. That keeps things simple, but it also means every mistake is your own. Plenty of people across Hertfordshire run a business this way for years without ever needing anything more complicated.
Registering and your first tax bill
You need to register for self assessment by 5/10 after the end of the tax year in which you started. For the 2026/27 tax year that is 5/10/2027. If your gross trading income for the year is £1,000 or less, the trading allowance means you may not need to report it at all.
The first bill is where many new sole traders get caught. On 31/1 you pay the tax for the year just gone, and usually a first payment on account towards the next year as well. A second payment on account follows on 31/7. Each one is half of the previous year's bill. If your bill is under £1,000, or most of your tax is already taken at source, no payments on account are needed. Warning you about it well in advance is one of the most useful things accountants for sole traders in Watford can do.
If your profit is falling, you can ask HMRC to reduce your payments on account. Reduce them too far and you pay interest on the difference, so we work out a sensible figure with you.
What is included
- Self assessment tax return each year
- Registration with HMRC as self employed
- Making Tax Digital set up and quarterly updates
- Profit and tax estimates during the year
- Advice on vehicle and home working costs
- Reducing payments on account where profits fall
- Help with HMRC letters and late filing issues
National Insurance on your profit
Sole traders pay Class 4 National Insurance through the tax return. For 2026/27 the rate is 6% on profits between £12,570 and £50,270, and 2% on profits above £50,270.
Class 2 National Insurance no longer has to be paid by most people. If your profit is £7,105 or more, it is treated as paid, which protects your record for the State Pension. Below that, you can choose to pay voluntary Class 2 at £3.65 a week to fill the gap. For anyone with low profits in a start up year, that small payment can be well worth it.
Making Tax Digital is here for many sole traders
Making Tax Digital for Income Tax applies from 6/4/2026 if your qualifying income is over £50,000. From 6/4/2027 the limit falls to £30,000, and from 6/4/2028 to £20,000. Qualifying income means your turnover from self employment plus any rental income, not your profit. A self employed plumber in Watford whose 2025/26 tax return shows £35,000 of sales will need to join from 6/4/2027, even with a lot of materials costs.
Under the scheme you keep digital records and send a quarterly update from compatible software. The quarters run to 5/7, 5/10, 5/1 and 5/4, with updates due on 7/8, 7/11, 7/2 and 7/5. You still file a tax return by 31/1, and you still pay tax on the usual dates. For 2026/27, late quarterly updates do not earn penalty points, but a late tax return still does.
Costs you can claim and the cash basis
Since 6/4/2024 most sole traders use the cash basis by default. You count money when it actually comes in and goes out, rather than when you send or receive an invoice. You can opt for traditional accounting if it suits your business better, for example if you hold a lot of stock or want to claim certain reliefs.
For your vehicle you can claim either a share of the actual running costs or a simplified mileage rate. If you work from home, a flat monthly rate based on the hours you work there is available instead of working out a share of your bills. Instead of claiming any expenses at all, you can deduct the £1,000 trading allowance. That only makes sense if your real costs are lower.
How accountants for sole traders in Watford help through the year
We set you up in simple software, check your records each quarter and tell you roughly what tax to put aside. When the tax year ends, we prepare your return, explain the bill line by line and file it well before 31/1.
If your profits keep rising, there may come a point where a limited company makes more sense. We will tell you when that point looks close, and what it would cost in extra paperwork, rather than pushing you into it.
Who this suits
- Mobile and home based trades across Watford and Three Rivers
- People with a job and a side business
- New sole traders filing their first return
- Sole traders with turnover close to the Making Tax Digital limits
- Shopfront businesses on St Albans Road and in North Watford
Common questions
I have a full time job and a weekend business. Do I need to tell HMRC?
If your gross income from the business is more than £1,000 in a tax year, yes. You register for self assessment and report the profit on a tax return. Your job stays taxed through PAYE as normal, and the business profit is added on top.
What is the trading allowance and should I use it?
It is a £1,000 tax free allowance for trading income. You can either deduct it from your income or claim your actual expenses, but not both. If your real costs are higher than £1,000, claiming them usually works out better.
Can I spread my tax bill instead of paying it all at once?
Payments on account already split your bill into two halves, paid on 31/1 and 31/7. You can also make extra payments to HMRC during the year to build up credit. We can tell you a sensible monthly amount to set aside.
How do I find my UTR number?
Your Unique Taxpayer Reference is a ten digit number HMRC sends after you register for self assessment. It appears on letters from HMRC and in your online HMRC account. We need it to act for you. If you cannot find it, accountants for sole traders in Watford like us can help you request it from HMRC.
My income has dropped this year. Do I still have to pay the full payment on account?
Not always. You can ask HMRC to reduce your payments on account if you expect a lower bill. If you reduce them too much, HMRC charges interest on the shortfall, so it pays to base the claim on proper figures.
When does Making Tax Digital start for me?
It depends on your qualifying income from self employment and property. Over £50,000 it started on 6/4/2026, over £30,000 it starts on 6/4/2027 and over £20,000 on 6/4/2028. HMRC uses figures from an earlier tax return to decide.