Accounting

Self Assessment Tax Returns · Northern Ireland

Self Assessment tax returns in Castlewellan

Sole traders, landlords, directors and higher earners across Northern Ireland use us for one reason: the return is filed correctly, on time, for a price they knew in advance. From Castlewellan the process is the same as everywhere in the UK. Records in, draft out, approve, filed, receipts back to you.

from £129 · fixed, one-off

Next deadlines

  • Online Self Assessment filing deadline and balancing payment due
  • Second payment on account due
  • Register for Self Assessment if you started self-employment or new untaxed income in the last tax year
  • Paper Self Assessment return deadline

Who this is for

Self Assessment Tax Returns for Castlewellan

Anyone in Castlewellan who has been told to file a return: the self-employed, landlords with one or several properties, company directors taking dividends, people earning over £100,000 or repaying Child Benefit through the High Income charge, and those with capital gains, foreign income or untaxed savings interest to report.

What is included

Everything inside the fixed fee

  • SA100 and every supplementary page you need (self-employment, UK property, dividends, capital gains, foreign income)
  • A reconciliation against your HMRC personal tax account so nothing is missed or double counted
  • Payments on account calculated and a one-page payment schedule sent to you
  • Claims for allowable expenses, pension relief, Gift Aid and the trading allowance checked before filing
  • Reminders at 60, 30 and 7 days before the 31 January deadline
  • HMRC correspondence about the return we filed handled at no extra charge

How it works

Self Assessment Tax Returns from Castlewellan, step by step

  1. Scope the job

    We find out what you need filed, when it is due and what state the records are in, and tell you which fixed-fee package applies.

  2. Agree the price

    The fee is confirmed in writing. There is no hourly billing and nothing added for questions during the work.

  3. Hand over the records

    Photographs, PDFs, software access or a spreadsheet, sent however suits you. We confirm what we have and what is missing within two working days.

  4. Approve, then we submit

    You review the draft with our explanation, sign off, and we file. Receipts, copies and the next deadlines come back to you immediately.

Why IGI

What you get in Castlewellan

One fixed fee for self assessment tax returns in Castlewellan, agreed in writing before any work starts and never changed part-way through the job, however long it takes us.

We work to the HMRC and Companies House calendar, not an appointment diary. Clients in Castlewellan get reminders at 60, 30 and 7 days before each date that applies to self assessment tax returns.

No appointments, no travel across Northern Ireland, no parking. Everything for self assessment tax returns in Castlewellan happens online, with a real person on the other end during UK working hours.

A named person handles your self assessment tax returns from Castlewellan and knows the file, so you are not re-explaining your business to a different helpdesk each time.

We explain self assessment tax returns in the words Castlewellan business owners use, not in accountant's shorthand, and we show our working so you can check it.

You stay in control of self assessment tax returns: drafts go to Castlewellan clients first, with the figures explained, and nothing leaves us until you say so.

Local facts

About Castlewellan

Castlewellan is in Northern Ireland, in the BT31 postcode district, Northern Ireland. Tax for Northern Ireland businesses and individuals matches the rest of the UK in almost every respect: UK income tax bands, UK National Insurance, UK Corporation Tax, Stamp Duty Land Tax. The exception is VAT on goods, where the Windsor Framework arrangements for trade with the Republic of Ireland and the EU create specific rules that online sellers and distributors need handled correctly.

Nearby places we also serve for self assessment tax returns
PlaceDistanceDirection
Newcastle, Northern Ireland4 miSE
Dromara9 miN
Ballynahinch10 miN
Annalong10 miS
Downpatrick10 miNE
Crossgar12 miNE
Annahilt12 miN
Kilkeel14 miS

Worth knowing

Rules that come up in this work

Making Tax Digital for Income Tax

MTD for Income Tax replaces one annual return with quarterly digital updates and a year-end declaration, submitted from software. The threshold is gross trading and property income, measured two years earlier, and started at £50,000 in April 2026 before falling to £30,000 in April 2027. Anyone affected needs digital record keeping in place before their start date, not after.

Late filing penalties

HMRC's penalties for a late Self Assessment return are automatic: £100 the day after 31 January, £10 a day from three months late up to £900, then the greater of £300 or 5% of the tax at six and twelve months. Interest and separate late-payment penalties apply to the tax itself. Companies House charges £150 to £1,500 for late accounts, doubling for a second consecutive year.

Payments on account

If your Self Assessment bill exceeds £1,000 and less than 80% of your tax was collected at source, HMRC asks for two advance payments towards the following year, each half of the current bill, due 31 January and 31 July. The first year this happens the January payment is effectively one and a half times the bill. We model it in advance and show you how to reduce the payments if income is falling.

The Self Assessment calendar

Four dates govern Self Assessment: 5 October to register, 31 October for paper returns, 31 January to file online and pay, and 31 July for the second payment on account. Missing the January date triggers an automatic £100 penalty before any tax is even considered, so we treat it as the fixed point around which the rest of the year is planned.

Director's loan accounts

A director's loan account records money moving between a director and the company that is not salary or dividend. If the director owes the company money nine months and one day after the year end, the company pays section 455 tax at 35.75% of the balance, refundable only when the loan is repaid. Loans over £10,000 are also a benefit in kind unless interest is charged at HMRC's official rate.

Salary versus dividends

Directors of their own companies usually take a salary at or just above the National Insurance thresholds, which keeps the year qualifying for State Pension and is deductible for Corporation Tax, with further income as dividends. Dividends above the £500 allowance are taxed at 10.75%, 35.75% and 39.35% by band and can only be paid from distributable profits after tax, with a minute and voucher each time.

Corporation Tax rates and marginal relief

Since April 2023 there have been two Corporation Tax rates, 19% small profits and 25% main, with marginal relief smoothing the transition between £50,000 and £250,000 of profit. The band is where planning matters: each pound of profit in it is taxed at an effective 26.5%, so pension contributions and capital expenditure timed to keep profit below £50,000 are worth more than they look.

Questions

Self Assessment Tax Returns questions from Castlewellan

Will Making Tax Digital change my return?

From April 2026 sole traders and landlords with qualifying income over £50,000 send quarterly updates to HMRC through software, with the £30,000 threshold following in April 2027. The year-end return becomes a final declaration. We set this up through our bookkeeping service when it applies to you.

What happens after you file?

You receive HMRC's submission receipt, a PDF of the return, the tax computation and a payment schedule with HMRC's bank details and your payment reference. We diarise next year's deadlines for you and send reminders before each one.

I am employed and have a small side income. Do I need a return?

If the side income is under £1,000 a year the trading allowance covers it and no return is needed. Above that you must register and file. If the side income is the only reason for the return, the £129 package applies and we make sure your PAYE figures from the P60 are reconciled correctly.

Do I pay before or after filing?

The fee is invoiced when you approve the draft, before we file. Nothing is submitted to HMRC until it is paid and you have confirmed every figure, and you receive HMRC's submission receipt within minutes of filing.

Can you deal with HMRC on my behalf?

Once you authorise us as your agent we can speak to HMRC about your return, see your account and respond to letters about the return we filed. The authorisation is free, done through your Government Gateway or a code HMRC posts to you, and takes a few days to activate.

Which expenses can I claim as a sole trader?

Costs that are wholly and exclusively for the business: materials, business travel other than ordinary commuting, a proportion of home running costs, software, insurance, professional fees and bank charges. If your expenses are under £1,000 the trading allowance may be better, and we check both.

Is self assessment tax returns in Castlewellan really the same price as elsewhere?

Yes. The fee published on this page is what a client in Castlewellan pays and what a client in any other part of Northern Ireland pays. It is confirmed in writing before work starts and the invoice matches the quote. Where a higher package applies because your situation is more complex, we say so at the quote stage, never afterwards.

Do you have an office in Castlewellan?

No. IGI Accounting is an online-only firm. We serve Castlewellan and every other UK postcode remotely, with records sent by WhatsApp or email and everything filed electronically. The absence of local premises is why the fee for self assessment tax returns is the same in Castlewellan as anywhere else in the country, and why there is nothing to visit and nothing to print.

Start the conversation from Castlewellan

Tell us what you need. You get one fixed fee in writing, and nothing is filed until you approve it.

WhatsApp for a fixed quote