South East · England
Accountants in Thornhill, Southampton
Accountants for Thornhill, Southampton who work to the deadline rather than the appointment diary. We handle Self Assessment, company accounts, Corporation Tax, bookkeeping, VAT and payroll for Thornhill clients at the fixed fees shown on this page, and the next dates that apply to your business are tracked from the day you join. There is no office in South East to visit, because none of the work needs one.
Next deadlines
- VAT return and payment for the quarter that ended last month
- VAT return and payment for the quarter that ended last month
- VAT return and payment for the quarter that ended last month
- Confirmation statement due within 14 days of your review date, at least once every 12 months
Services
What we do for Thornhill and what it costs
The eight core services below each have a page for Thornhill, Southampton; specialist and advisory services are delivered nationally and are listed further down. Every fee is fixed and confirmed in writing before work starts.
Why IGI
Working with Thornhill businesses
An online firm suits Thornhill because the things that matter in accounting, accuracy, deadlines, clear explanations and a known price, do not depend on geography. What does depend on geography is overhead, and by not carrying it we charge Thornhill, Southampton clients the published fee and nothing more, with every submission approved by you before it goes.
Deadline-first: the dates that matter for self assessment tax returns are shown at the top of this page, diarised for every Thornhill client and chased before they arrive.
The price for self assessment tax returns is published on this page and is what a client in Thornhill pays. We confirm it in writing first, and the invoice matches the quote.
You get one contact for self assessment tax returns, not a queue. Thornhill, Southampton clients message the same person throughout and get an answer in working hours, usually within a few hours.
Local facts
About Thornhill, Southampton
Thornhill, Southampton sits in South East. For businesses in England the tax rules are those set by the UK Parliament: the 20/40/45% income tax bands, Class 4 National Insurance for the self-employed at 6% and 2%, Corporation Tax at 19% to 25%, and Stamp Duty Land Tax on property. Business rates are set locally by the council.
| Place | Distance | Direction |
|---|---|---|
| Thornhill Park | 0.4 mi | NW |
| Hightown, Southampton | 0.5 mi | S |
| Weston Common | 0.5 mi | SW |
| Netley Common | 0.5 mi | SE |
| Surrey House Estate | 0.6 mi | SW |
| Moorhill | 0.8 mi | N |
| Harefield, Southampton | 0.8 mi | NW |
| Sholing Common | 0.9 mi | W |
All places in South East · South East places beginning with T
National services
Also available to Thornhill clients
These services do not vary by location and are delivered the same way for Thornhill, Southampton as for the rest of the UK.
- Limited by Guarantee Formation from £49
- Dormant Company Formation from £29
- Non-Resident UK Company Formation from £149
- Registered Office Address from £69/yr
- Confirmation Statement Filing £33
- Company Name Change £49
- Director Appointments & Resignations £29
- PSC Register Changes £39
- SIC Code Change £39
- Registered Office Address Change £29
- VAT Registration £49
- PAYE Employer Registration £49
- UTR Registration £29
- CIS Registration £49
- Dormant Company Accounts £49
- Make a Company Dormant £44
- Company Strike-Off & Dissolution £59
- CIS Tax Returns from £30/mo
- R&D Tax Credits from £999
- Crypto Tax from £199
- Capital Gains Tax from £149
- Landlord & Property Tax from £149
- Contractor Accountants from £75/mo
- Startup Accountants from £59/mo
- E-commerce Accountants from £79/mo
- Freelancer Accountants from £45/mo
- Small Business Accountants from £65/mo
- Locum Accountants from £69/mo
- Management Accounts from £99/mo
- Tax Planning from £249
- Business Advisory from £149
- Cash-Flow Forecasting from £199
- HMRC Investigation Support from £299
- Making Tax Digital from £99
- Accounting Software Support from £99
Worth knowing
Rules that affect most businesses here
CIS deductions
CIS turns construction subcontractors into advance taxpayers: a fifth of every labour payment goes to HMRC before they see it. Registering keeps the rate at 20% rather than 30%; gross payment status, for established businesses with a clean record, removes deductions altogether. The annual return is where the overpayment comes back, and filing it early brings the refund sooner.
Confirmation statements and identity verification
The confirmation statement is the annual check that the public register is right: officers, registered office, SIC codes, shareholders and the PSC register. It carries a £50 fee and no financial penalty for lateness, but failure to file leads to compulsory strike-off. The identity verification regime introduced in November 2025 has added a further check to every statement.
Corporation Tax rates and marginal relief
Corporation Tax is not a flat rate. Profits to £50,000 pay 19%, profits above £250,000 pay 25%, and the band between is taxed at an effective marginal rate of 26.5% through the marginal relief mechanism. Associated companies share the thresholds, which catches directors who own more than one company and is the most common cause of underpaid tax in owner-managed groups.
The VAT registration threshold
VAT registration is compulsory once taxable turnover in any rolling twelve-month period exceeds £90,000, or when you expect to exceed that in the next thirty days alone. The test is rolling, not by tax year, and includes zero-rated sales. Businesses regularly cross it without noticing, and late registration means accounting for VAT on sales where it was never charged to customers.
Director's loan accounts
The most common tax problem in owner-managed companies is an overdrawn director's loan account: drawings taken during the year that were never declared as dividends or salary. The company faces a 35.75% charge on the balance outstanding nine months after the year end, and the director may have a benefit in kind. We review the account before every year end to clear it properly.
Questions
Questions from Thornhill
I already have an accountant in Thornhill. How hard is it to switch?
It takes about two weeks and costs nothing extra. You authorise us, we write to your current accountant for professional clearance and your records, and we transfer the agent authorisations. We pick up the next filing without a gap. You do not need to wait for a year end, and we tell you honestly if switching mid-job would be awkward.
Can you deal with HMRC and Companies House for me?
Yes. Once you authorise us as your agent, HMRC and Companies House correspond with us about the filings we make for your Thornhill business, and we can see your accounts and respond on your behalf. Authorisation is free and takes a few days to activate. Routine correspondence about work we have filed is handled at no extra charge.
Why are the fees the same in Thornhill as in London?
Because the cost of an accountant is mostly premises and that is a cost we do not have. The work is done online by UK-based staff, so a client in Thornhill, Southampton pays exactly the published fee, as does a client in central London or a Highland village. The fee is confirmed in writing before anything starts.
Which services are available in Thornhill?
Every service on this page is available to businesses and individuals in Thornhill, Southampton, at the fee shown. Core compliance work, accounts, tax returns, bookkeeping, VAT, payroll and company formation, is listed with its own local page. Specialist services such as R&D, crypto tax and HMRC enquiry support are national services delivered the same way from anywhere in the UK.
How do I get started from Thornhill, Southampton?
Message us on WhatsApp or email with a sentence about your business and what you need. We reply in working hours with any questions and a fixed fee for self assessment tax returns. Once you confirm, we tell you exactly which records to send and the work begins. Most Thornhill clients are set up within a day.
Which deadlines matter most for self assessment tax returns?
The next four dates that apply to self assessment tax returns are shown at the top of this page, calculated from today. For Thornhill clients we diarise every one of them from the day you join and send reminders before each, so the work is done in good time rather than in the last week before a penalty.
Start the conversation from Thornhill
Tell us what you need. You get one fixed fee in writing, and nothing is filed until you approve it.