Information You Need to Supply for Professional Help with Your Tax Return

Information You Need to Supply for Professional Help with Your Tax Return

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Information You Need to Supply for Professional Help with Your Tax Return

[Updated November 2025]: If you’re self-employed in the UK and earn more than £1,000 after allowable deductions, you need to file a self-assessment tax return each year. It’s not only the self-employed, though. If you are on a higher income* or receive untaxed income from things like property rental, tips, commission, savings, investments, dividends, or foreign income, you also have to submit a return. Partners in business partnerships and those who made a capital gain resulting in Capital Gains Tax (CGT) also need to submit a return. You can check here if you’re not sure.

If you do have to fill in a self-assessment tax return, getting all the tax return fields filled in properly and the figures right can sometimes be difficult. That’s where professional help from companies like Taxfile is worth its weight in gold. But what information will your accountant or tax advisor need from you? In today’s guide, we’ll explain exactly what you’ll need to supply.

* (Those earning more than £100,000 for tax years up to and including 2022-23, or over £150,000 for the tax year 2023-24. Higher earners earning only through PAYE for tax years thereafter only need to submit a tax return if their tax was not collected correctly at source). You can check here if you’re not sure.

What Information Do You Need to Supply for Professional Help with Your Tax Return?

If you’re getting help filling in and submitting your tax return through an accountant or tax advisor like Taxfile, a list of what they will need from you follows below. You’ll need to supply information for the right financial tax year, of course, unless you have a different accounting period.

For the purpose of this post today, let’s assume information will be required for the tax year starting on 6 April 2024 and ending on 5 April 2025.

Here’s what will be needed:

Income-related information if applicable:

  • Copies of all employment income documents (P60s, P45s, and P11ds), as well as any unreimbursed employment expenses.
  • Copies of all pension income documents (P60s, state pension notices, etc.).
  • Details of bank and building society interest.
  • Details of all investment income (interest, dividends, etc.), as well as details of any investments that may qualify for relief, such as the Enterprise Investment Scheme.
  • Details of any self-employed income and expenses (schedules and paperwork).
  • Details of any rental income and expenses (schedules and paperwork).
  • Details of any assets that were sold (or gifted) and may be subject to Capital Gains Tax (CGT).
  • Details of any other income received, including foreign income.

Potential tax relief information:

  • Details of any personal pension contributions made from taxed income.
  • Details of any gifts to charity using Gift Aid.

You’ll also need to confirm if there is any other information that may be relevant to the completion of your tax return.

Personal Information:

If you’re a new client or an existing client who hasn’t supplied them already, you’ll also need to provide the following:

  • A copy of your passport or driver’s licence. This is to comply with ‘Know Your Customer’ (KYC) and ‘Anti-Money Laundering’ (AML) regulations.
  • Confirmation of any changes to your personal details, such as a change of address.
  • If you or your partner receive Child Benefit, you’ll need to provide details.
  • If you have a student loan, you’ll need to provide details of the amount you paid during the year and the remaining balance as at April 5, 2025.

Once your accountant or tax advisor receives all of your information, they will be in a position to prepare your tax return. Once approved by you, they will be able to submit it to HMRC on your behalf.

Do You Need Help With Your Tax Return?

Taxfile would be delighted to help you with your self-assessment tax return — or any other type of tax return. We prepare and submit hundreds of tax returns every year for our clients as well as offering all the usual accountancy-related services like bookkeeping, VAT returns, end-of-year accounts for limited companies, arranging tax rebates for CIS sub-contractors and others, accounting for capital gains tax (CGT), payroll, auto-enrolment for workplace pensions and much more.  If it involves tax or accounting, we can help!

For help with any tax or accounting matter, call Taxfile on 020 8761 8000 or book your free 20-minute, no-obligation consultation here. Alternatively, send us a message and we’ll come right back to you. We’re tax advisors and accountants in Tulse Hill near Dulwich (SE21) in the South East.

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Late with your tax return and tax payment? What happens now?

Missed the Tax Return Deadline? What Happens Now?

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Missed the Tax Return Deadline? What Happens Now?

[Updated February 2025]: If you missed the 31 January deadline to submit your self-assessment tax return, you are now into the penalty stage. HMRC applies an automatic £100 penalty to those who are anywhere from 1 day to 3 months late. Further penalties are then added if you take even longer to comply. It’s even worse if you haven’t paid the tax owed to HMRC by 31 January because you’ll then owe interest on that too.

Our Advice if You’re Late

If you are late submitting your tax return and/or paying the tax owed, our advice is to:

  1. submit your tax return without delay;
  2. pay as much tax as you can as soon as possible*.
    By doing both, you’ll minimise the penalty and interest payable to HMRC.

* Payment of any historic tax for 2023/24 and prior years is best dealt with by the last day of February at the latest. Any amount that remains due for 2023/24 is considered late thereafter and will attract an automatic HMRC charge of 5%.

What if you Cannot Pay?

If you cannot pay (or have tax arrears) it’s important that you demonstrate to HMRC that you’re paying as much as you can — and as regularly as possible. The good news is that HMRC has a quick and easy facility for exactly this purpose. By calling 0300 200 3402, you can pay using a debit card. It takes only minutes and doesn’t require any explanation — give it a try!

You will need your tax reference and, after making a payment, will be given a payment reference.

Possible Excuses for Late Tax Returns

What are your options if there were genuine reasons, beyond your control, that stopped you being able to submit your tax return on time? Well, if you “took reasonable care to meet” a deadline and there was a genuine reason why you were late, you have the option to appeal. However, your circumstances must fit HMRC’s eligibility criteria. Let’s take a look at those below.

Circumstances that are taken into account by HMRC when considering appeals include:

  • if a close relative or partner died shortly before the tax return or payment deadline;
  • if you had to stay in hospital unexpectedly;
  • if you had a life-threatening or serious illness;
  • if your computer or software failed at the time you were preparing your online return;
  • if HMRC’s online services were disrupted;
  • if you were prevented from filing your return or paying your tax because of a fire, flood or theft;
  • if there were unexpected postal delays;
  • if you have a disability of mental illness that affected the delay;
  • if you misunderstood your legal obligation, or were unaware of it;
  • if someone you’d appointed for the task (e.g. accountant or tax adviser) failed in their obligation on your behalf;
  • and occasionally other reasons which, if genuine, HMRC may deem to be relevant (for example, some Covid-related circumstances).

Excuses that aren’t usually accepted by HMRC include:

  • you didn’t receive a reminder from HMRC;
  • you found HMRC’s online system too difficult to use;
  • your cheque bounced or payment failed due to you having insufficient funds;
  • you made an error on your return.

Appealing Against an HMRC Penalty

You have the right to appeal against HMRC’s decision to issue you a penalty so long as it’s appealed soon enough after the penalty notice. That includes penalties for late tax returns or payments. Taxfile can help advise you about all of that (see below).

Taxfile are Here to Help

If your tax return is late, you owe HMRC tax, or are owed a refund by them, come and see us as soon as possible. Taxfile are accountants and tax advisors in Tulse Hill, South London. We’ll help to sort it all out for you with the minimum of fuss, at a competitive price. Come in as early in the month as you can and we’ll help you to sort things out — for the best possible outcome. We know the rules and liaise with HMRC every single day on behalf of our clients. So, if we can help convince HMRC to reduce or completely remove any penalty you may be facing, we will do so, so long as your circumstances fit the relevant HMRC criteria. You can only appeal within 30 days of the date of any penalty notice you receive, so the earlier you contact us the better – give us a call on 020 8761 8000 or fill in this short form and we’ll take it from there. Alternatively, book an appointment with one of our expert tax advisors to chat things over, without obligation. Payment plans called ‘Time to Pay’ arrangements may also be available for eligible people who cannot to afford to pay their tax in one lump sum — Taxfile would be happy to tell you more.

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