Why people in Watford use a self assessment accountant
Self assessment is the HMRC system for income that has not already been taxed at source. Most people who use it are not short of ability. They are short of time, and the return lands in the middle of winter when everyone else is busy too. A self assessment accountant gets the figures right first time, spots reliefs you may not know about and sends the return well before the rush.
Our clients include sole traders in North Watford and Garston, landlords with a flat or two in Bushey and Oxhey, and employees who earn something on the side. Each of them has the same core job to do every year: tell HMRC what came in, claim what can be claimed and pay the right amount on the right date. We handle that job for you, and you approve the return before anything is sent.
Do you need to file a return
Not everyone does, and a careful self assessment accountant will tell you when you can stop filing. If your only income is a salary or pension taxed through PAYE, you often have nothing to report. The picture changes when untaxed income appears, and HMRC expects you to tell it by 5/10 after the end of the tax year in which that happened. For the 2026/27 tax year, that means 5/10/2027.
Common reasons people around Watford and Hertfordshire need to register include the following.
- Self employed income with gross takings over £1,000 in the year
- Rental income above £2,500 after expenses, or £10,000 before expenses
- Child benefit in a household where one partner has income over £60,000
- Capital gains with tax to pay that have not already been reported
- Untaxed income from abroad
What is included
- Registering you for self assessment with HMRC
- Preparing and filing your yearly tax return
- Working out your tax bill and payments on account
- Requests to reduce payments on account where justified
- Claiming allowable expenses and reliefs
- Catching up on late or missed returns
- Help with penalty appeals where you had a reasonable excuse
- Acting as your agent with HMRC
The self assessment calendar for 2026/27
Dates are where most problems start. Missing one by a day still counts as late, and HMRC applies some penalties automatically. These are the key dates for income earned between 6/4/2026 and 5/4/2027.
- 5/10/2027: tell HMRC if this is your first year in self assessment
- 31/10/2027: deadline for a paper return
- 30/12/2027: file online by this date if you want a balance under £3,000 collected through your PAYE tax code
- 31/01/2028: online return due, plus any balance for 2026/27 and the first payment on account for 2027/28
- 31/07/2028: second payment on account for 2027/28
How payments on account work
Payments on account are advance payments towards next year's bill. Each one is half of the previous year's tax bill. They are due on 31/1 and 31/7, and they apply unless your last bill was under £1,000 or more than 80% of your tax was already collected at source, for example through PAYE.
The shock usually comes in the second year. A new sole trader might owe a balancing payment for their first year and, on the same 31/1, the first payment on account for the year after. That can feel like paying one and a half years of tax at once. As your self assessment accountant, we show you the figure months ahead so you can put money aside.
If your income has fallen, you can ask HMRC to reduce your payments on account. It is a sensible step, but HMRC charges interest if you cut them too far and the final bill turns out higher. We only recommend a reduction when the numbers support it.
Late returns, penalties and interest
A return filed even one day after 31/1 brings an automatic £100 penalty. Further penalties follow at 3, 6 and 12 months late, and late payment carries its own penalties plus interest on top. These can quickly grow larger than the original tax.
If you have missed a year, or several, it is better to deal with it now. We prepare the outstanding returns, work out what is owed and, where you had a reasonable excuse such as serious illness, help you ask HMRC to cancel a penalty. Mistakes on a return already filed can usually be corrected within 12 months of the 31/1 deadline for that year.
Making Tax Digital and your yearly return
From 6/4/2026, sole traders and landlords with qualifying income over £50,000 have to keep digital records and send quarterly updates to HMRC. Qualifying income means gross self employment and property income, not profit. The threshold falls to £30,000 from 6/4/2027 and £20,000 from 6/4/2028.
The yearly return does not disappear. You still file a tax return through your MTD software, and it is still due by 31/1. We cover the quarterly side in detail on our Making Tax Digital page.
Working with a tax return accountant online
Our office is at 186 St Albans Road in Watford, but most clients in Rickmansworth, Hemel Hempstead and further afield never need to visit. You upload your documents, we ask questions by email or on a short video call, and then we send you a draft return to check. Once you approve it, we file it and confirm exactly what to pay and when.
You will need your Unique Taxpayer Reference, a ten digit number HMRC gives you when you register. As your tax return accountant, we become your authorised agent, so HMRC can speak to us directly. Fees are fixed and agreed before any work starts, after a free review of your situation.
Who this suits
- Sole traders and freelancers filing their first or tenth return
- Landlords with rental income in Watford or elsewhere
- Employees with untaxed side income
- Families paying the child benefit charge
- Anyone behind on returns who wants to catch up
Common questions
When is my 2026/27 self assessment tax return due?
An online return for the 2026/27 tax year is due by 31/01/2028. A paper return must reach HMRC by 31/10/2027. Any tax owed for the year is also due on 31/01/2028.
Why is my second year tax bill so much bigger than the first?
In your second year, you usually pay the balance for the previous year and your first payment on account for the current year on the same date. Payments on account are each half of last year's bill. It is a timing issue rather than extra tax, but it needs planning.
Can I reduce my payments on account if I earn less this year?
Yes. You can ask HMRC to reduce them if you expect your bill to be lower. If you reduce them too far, HMRC charges interest on the shortfall, so it is worth having the figures checked first.
What happens if I file my tax return after 31/1?
HMRC charges an automatic £100 penalty, and more penalties follow at 3, 6 and 12 months late. Paying late also brings interest and separate penalties. Filing as soon as possible limits the damage.
I cannot find my UTR. What should I do?
Your Unique Taxpayer Reference is a ten digit number. It appears on letters from HMRC and in your online HMRC account. If you still cannot find it, HMRC can send it to you by post.
Do I need a tax return for a small side hustle?
If your gross takings from self employment are £1,000 or less in the tax year, the trading allowance means you usually do not need to report them. Above that, you need to register for self assessment and file a return.
Can my tax bill be collected through my tax code instead?
If you are employed or get a pension through PAYE, owe less than £3,000 and file online by 30/12, HMRC can usually collect the balance through your tax code over the next tax year. This spreads the cost across your pay.
Can a tax return accountant sort out returns I missed years ago?
Yes. We gather what records you have, prepare each missing return and work out the tax, penalties and interest. Coming forward before HMRC chases you usually puts you in a better position.