Self Assessment Tax Returns · South East
Self Assessment tax returns in Mentmore
If HMRC has asked you for a tax return, the quickest way to get it done from Mentmore is to hand it over. You upload what you have, we tell you what is missing, and the finished SA100 comes back for approval with the tax owed explained line by line. One fixed fee for Mentmore residents, agreed in writing, no hourly rate.
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 Mentmore
Anyone in Mentmore 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 Mentmore, step by step
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.
Agree the price
The fee is confirmed in writing. There is no hourly billing and nothing added for questions during the work.
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.
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 Mentmore
No hourly rate and no surprise invoice. Mentmore clients know the fee for self assessment tax returns before they send a single document, and it stays fixed.
Deadline-first: the dates that matter for self assessment tax returns are shown at the top of this page, diarised for every Mentmore client and chased before they arrive.
Online only, UK based. There is no office in Mentmore to pay for, which is why the fee is the same here as anywhere in England; the work is done by people in the UK who answer the same day.
You get one contact for self assessment tax returns, not a queue. Mentmore clients message the same person throughout and get an answer in working hours, usually within a few hours.
Plain English, with the numbers. Every draft for Mentmore comes with a short explanation of what the figures mean and what, if anything, you should do about them.
Approval before filing is a rule, not a courtesy. For self assessment tax returns in Mentmore, every submission to HMRC or Companies House follows your written go-ahead.
Local facts
About Mentmore
Mentmore is in South East, England. 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 |
|---|---|---|
| Horton, Buckinghamshire | 1 mi | E |
| Crafton | 1 mi | W |
| Ledburn | 1 mi | N |
| Cheddington | 2 mi | SE |
| Westend Hill | 2 mi | S |
| Slapton, South East | 2 mi | E |
| Grove, Buckinghamshire | 2 mi | NE |
| Lower Ascott | 2 mi | NW |
Worth knowing
Rules that come up in this work
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
Self Assessment runs on a fixed annual cycle. Registration by 5 October following the tax year, online filing and payment by 31 January, and a second instalment on 31 July for those making payments on account. The penalties for lateness are automatic and escalate monthly, which is why we file early and chase approvals well before the window closes.
Making Tax Digital for Income Tax
The biggest change to Self Assessment in a generation is Making Tax Digital for Income Tax, now live for higher-earning sole traders and landlords and arriving for the rest in stages. Quarterly updates are due by 7 August, 7 November, 7 February and 7 May, built from digital records. The practical consequence is that spreadsheet-and-shoebox bookkeeping is ending for anyone above the threshold.
Late filing penalties
Penalties are the clearest reason to work to deadlines. A Self Assessment return one day late costs £100 regardless of whether any tax is due; three months late adds £10 a day. Late company accounts start at £150 and reach £1,500, and double if the previous year was also late. None of this is negotiable afterwards except through a narrow reasonable-excuse appeal.
Workplace pensions and auto-enrolment
Every employer must assess its workers for automatic enrolment from the first employee's start date. Those aged 22 to State Pension age earning over £10,000 a year must be enrolled into a qualifying pension with minimum contributions of 8% of qualifying earnings, at least 3% from the employer, and a declaration of compliance made to the Pensions Regulator within five months.
Employer National Insurance
Since April 2025 employer National Insurance has been 15% on earnings above a £5,000 secondary threshold, a substantial increase for small employers. The Employment Allowance rose to £10,500 at the same time to soften it for the smallest businesses. Directors deciding their own salary weigh this cost against the Corporation Tax deduction a salary provides.
The trading and property allowances
Not every small income needs a tax return. The trading allowance exempts the first £1,000 of self-employment or casual income and the property allowance does the same for rental income, each measured on gross receipts. They cannot be combined with rent-a-room relief on the same income, and claiming the allowance means giving up the expense deduction for that source.
Questions
Self Assessment Tax Returns questions from Mentmore
What if my return is late?
We file late returns at the £179 rescue fee, which includes drafting a reasonable-excuse appeal where the facts support one. The £100 automatic penalty is HMRC's, not ours, and we tell you honestly whether an appeal has a realistic chance before you pay for it.
I have never filed before. Do I need a UTR first?
Yes. If you have not registered we handle the registration as part of the job and HMRC posts your Unique Taxpayer Reference within about ten working days. Start early if your first deadline is close, because HMRC will not accept a return without it.
How quickly can you file once I send my records?
Most straightforward returns are drafted within five working days of receiving complete records and filed the day you approve. In January we prioritise by deadline risk and tell you your slot when you book, so late bookers are not left guessing.
What does the £129 return cover?
A full SA100 with the supplementary pages for one income source, prepared, checked and filed online. Rental income, capital gains or several income sources move you to the £169 or £199 package, and we tell you which applies before we start, never on the invoice.
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.
How do payments on account work?
If your bill is over £1,000 and less than 80% of your tax is collected at source, HMRC asks for two advance payments towards next year, due 31 January and 31 July, each half of this year's bill. We calculate both and show you how to reduce them if your income is falling.
How do I get started from Mentmore?
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 Mentmore 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 Mentmore 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.
Fixed fees, filed on time, for Mentmore
Tell us what you need. You get one fixed fee in writing, and nothing is filed until you approve it.