Preparing a tax return is not always as straightforward as declaring income and submitting an online form. Different rules may apply to employment income, self-employment, rental property, dividends, overseas earnings and capital gains. Legitimate expenses and tax reliefs must also be considered before the correct liability can be calculated.

Professional tax return services can make the process more accurate, organised and manageable. An experienced accountant can review your financial records, identify relevant deductions, calculate the amount payable and submit the appropriate return to HM Revenue & Customs.

SAS Accountants provides comprehensive tax return services for individuals, sole traders, landlords, contractors, partnerships, company directors and limited companies. The team combines accurate preparation with straightforward explanations, helping clients understand both their current liabilities and their future responsibilities.

Why Professional Tax Return Support Matters

Tax returns contain information that can affect your liability, HMRC records and future financial planning. Even an innocent mistake may result in additional tax, interest or correspondence from HMRC.

Common problems include omitting an income source, entering figures in the wrong section, claiming personal expenditure as a business expense or failing to account for payments on account. Some taxpayers also pay more tax than necessary because they overlook legitimate allowances and reliefs.

Professional support provides an additional level of review. Instead of simply transferring totals into a return, an accountant considers whether the records are complete, whether the treatment is appropriate and whether any further information is required.

SAS Accountants aims to ensure that every return is accurate, properly supported and submitted within the applicable deadline.

What Is Included in a Tax Return Service?

A professional tax return service normally begins with an assessment of your financial circumstances. Your accountant needs to understand how you earned your income, whether tax has already been deducted and whether any significant changes occurred during the year.

The service may include reviewing income records, organising expenses, calculating taxable profits and identifying available reliefs. The appropriate return is then prepared and provided for your approval before electronic submission.

A good accountant should also explain the calculation. You should understand how much is due, when it must be paid and whether the total includes payments towards the following tax year.

SAS Accountants can also advise on improved record-keeping, digital reporting and sensible tax planning for future periods.

Self Assessment Tax Returns

Self Assessment is the system HMRC uses to collect tax from individuals whose liabilities have not been fully dealt with through PAYE or another automatic deduction.

A return may include income from self-employment, partnerships, rental property, dividends, savings, investments or overseas sources. Capital gains, pension contributions and student-loan obligations may also need to be reported.

Self Assessment commonly applies to sole traders, landlords and partners in a business partnership. Employees and company directors may also need to file if they receive additional untaxed income or HMRC formally issues a notice requiring a return.

SAS Accountants can review your circumstances, establish what must be reported and prepare the return using the supporting information you provide.

Self Assessment Deadlines for 2025–26

The 2025–26 tax year ended on 5 April 2026. Someone who needs to use Self Assessment for the first time will generally need to notify HMRC by 5 October 2026.

Paper returns must normally reach HMRC by 31 October 2026. Online returns must be submitted by 31 January 2027, and the corresponding tax payment is generally due on the same date.

If an eligible taxpayer wants HMRC to collect an amount through their PAYE tax code, an earlier online filing deadline of 30 December 2026 normally applies. HMRC confirms these dates in its Self Assessment deadline guidance.

Beginning the process early gives you time to locate missing records, resolve unclear transactions and prepare for the amount payable.

Tax Returns for Sole Traders

Sole traders are generally taxed on business profits rather than total sales. The calculation therefore needs to include both trading income and allowable business expenditure.

Depending on the business, eligible expenses may include professional fees, advertising, insurance, office costs, software subscriptions and certain travel or premises expenses. Equipment and vehicles may require separate consideration under capital-allowance or simplified-expense rules.

Personal expenditure cannot normally be deducted simply because it was paid from a business bank account. Where an expense has both business and private use, only the appropriate business proportion may be allowable.

SAS Accountants can review income and expenses, identify legitimate claims and calculate the taxable profit accurately. The team can also help sole traders establish better bookkeeping systems for future returns.

Tax Return Services for Landlords

Landlords may need to report rental income and eligible property expenses through Self Assessment. Relevant information can include rent received, letting-agent fees, insurance, repairs and certain replacement costs.

It is important to distinguish between routine repairs and capital improvements. Restoring an existing feature may receive different treatment from replacing it with something substantially better.

Residential mortgage interest is also subject to specific rules for individuals. It should not automatically be deducted in the same manner as an ordinary property expense.

The position may become more complicated where a property is owned jointly, rented for only part of the year or sold. A disposal may create a Capital Gains Tax liability with a separate reporting deadline.

SAS Accountants can help landlords organise property records, calculate rental profits and understand how property income affects their wider tax position.

CIS Tax Returns for Subcontractors

Subcontractors working under the Construction Industry Scheme frequently have tax deducted from their payments before receiving them.

These deductions are advance payments towards the subcontractor’s eventual Income Tax and National Insurance position. The final calculation is completed through Self Assessment after business income, expenses and CIS deductions have been considered.

Subcontractors should retain their monthly deduction statements and check that these agree with their payment records. Missing or incorrect statements can delay preparation of the return and any potential repayment.

SAS Accountants can reconcile CIS deductions, review eligible construction-related expenditure and prepare the annual return. Depending on the final figures, the subcontractor may owe additional tax or qualify for a repayment.

Partnership Tax Returns

A business partnership normally needs to submit a partnership return showing its income, expenses and total profit or loss. Each partner must then report their allocated share through an individual Self Assessment return.

The figures in the partnership return must agree with those reported by the partners. Incorrect allocations or inconsistent records can create discrepancies and potential HMRC questions.

SAS Accountants can prepare the partnership return, calculate the appropriate profit shares and coordinate the personal returns of the individual partners.

Company Tax Returns

Limited companies must prepare annual accounts and submit a Company Tax Return to HMRC. The return includes taxable profits, relevant adjustments, reliefs and the Corporation Tax calculation.

The deadline for filing a Company Tax Return is generally 12 months after the end of the accounting period. Corporation Tax is usually payable earlier, at nine months and one day after the accounting period ends. Different payment rules can apply to companies with substantial profits. HMRC explains the standard dates in its Company Tax Return guidance.

A company must still file the required return when HMRC has issued a notice, even if there is no Corporation Tax to pay.

SAS Accountants can prepare annual accounts, calculate Corporation Tax and submit the Company Tax Return using compatible commercial software. Directors also receive a clear explanation of the figures and the company’s overall financial performance.

Personal Tax Returns for Company Directors

Holding a company-director position does not automatically mean that every director needs to complete Self Assessment. However, a personal return may be required when the director receives dividends, property income, taxable benefits, capital gains or other untaxed income.

Salary, dividends, benefits, expense reimbursements and director’s loans all have different tax treatments. The information reported personally should agree with the company’s payroll, dividend documentation and annual accounts.

SAS Accountants can prepare the director’s personal return alongside the company accounts, helping ensure that the records remain accurate and consistent.

Capital Gains Tax Reporting

Selling property, shares or another valuable asset may result in a taxable capital gain. The tax calculation is based on the gain rather than simply the total sale proceeds.

Purchase costs, disposal expenses, qualifying improvements, capital losses and available reliefs may all affect the final amount. The appropriate treatment depends on the type of asset and the taxpayer’s circumstances.

Certain property disposals have reporting deadlines that arise before the normal Self Assessment deadline. Waiting until the annual return is prepared could therefore result in late reporting.

SAS Accountants can calculate potential gains, consider available reliefs and explain the reporting and payment requirements. Seeking advice before completing a major disposal can provide a clearer understanding of its likely tax consequences.

Overseas Income and Tax Returns

UK taxpayers may receive income from overseas employment, property, investments or business activities. Foreign income can create complicated reporting obligations.

The correct treatment may depend on UK residence status, the source of the income and whether tax has already been paid in another country. Paying overseas tax does not necessarily remove the requirement to declare the income in the UK, although double-taxation relief may be available.

Bank statements and financial documents denominated in another currency may need to be converted using an appropriate exchange rate.

SAS Accountants can help clients organise overseas income information and report it correctly. Complex residence, domicile, trust or cross-border matters may require additional specialist consideration.

Reporting Dividends, Savings and Investment Income

Individuals may receive dividends from their own limited companies or investments in other businesses. They may also earn savings interest or receive income from investment funds.

Even where a bank or investment platform reports information directly to HMRC, the taxpayer remains responsible for ensuring that their return is complete and accurate.

Dividend vouchers, bank statements and investment reports should be retained. Where assets have been sold, transaction histories may also be required to calculate capital gains or losses.

Professional tax return services help bring these different sources together so that the taxpayer’s overall position is calculated correctly.

Understanding Payments on Account

Payments on account are advance contributions towards a taxpayer’s next Self Assessment liability. They commonly apply when a significant amount of tax is not collected at source.

The first payment is generally due on 31 January alongside any remaining balance for the year already reported. The second is normally due on 31 July.

Consequently, the January amount can be considerably higher than expected. Part of the payment may relate to the following tax year rather than the return just completed.

If income is genuinely expected to fall, it may be possible to reduce payments on account. However, reducing them excessively can lead to interest when the actual liability is calculated.

SAS Accountants can explain the amount due and assess whether an application for reduction is reasonable.

Making Tax Digital for Income Tax

Making Tax Digital for Income Tax became mandatory on 6 April 2026 for qualifying sole traders and landlords whose combined gross income from self-employment and property exceeded £50,000 in the relevant earlier tax year.

Affected taxpayers must use compatible software to create digital records and submit quarterly summaries to HMRC. These updates contain totals for business or property income and expenses; they are not additional tax returns.

The qualifying-income threshold is scheduled to reduce to more than £30,000 from April 2027 and more than £20,000 from April 2028. Qualifying income is generally measured before expenses rather than by taxable profit.

HMRC explains the current requirements in its Making Tax Digital for Income Tax guidance.

SAS Accountants can help taxpayers determine when the rules apply, select suitable software and maintain the records needed for quarterly and annual reporting.

What Records Are Needed?

The records required depend on the type of return and your sources of income.

Sole traders may need sales invoices, expense receipts, bank statements, mileage records and details of equipment purchases. Landlords should provide rental statements, mortgage-interest documents, repair invoices and letting-agent summaries.

CIS subcontractors should retain deduction statements, while company directors may need salary records, dividend vouchers and director’s loan information. Investment statements, pension documents and property-disposal records may also be relevant.

Organised information allows the return to be prepared more efficiently. It also provides evidence supporting the figures if HMRC later raises a question.

SAS Accountants can provide a personalised checklist based on your particular tax position.

Benefits of Filing Early

Filing early does not normally mean that the tax must be paid immediately. The usual payment deadline continues to apply.

Early preparation tells you the amount due sooner, providing additional time to budget and manage cash flow. It also allows missing information and bookkeeping errors to be addressed without the pressure of an approaching deadline.

If a repayment is due, filing early may allow the claim to be processed sooner. Completed tax calculations may also be useful when applying for a mortgage, rental property or business finance.

HMRC itself encourages taxpayers to submit their returns early rather than waiting until January.

Correcting an Earlier Return

Mistakes sometimes become apparent after a tax return has been submitted. Income may have been omitted, an expense duplicated or information entered in the wrong section.

Self Assessment returns can generally be amended within twelve months of the original filing deadline. Older errors may require a separate disclosure or written communication with HMRC.

Company Tax Returns also have an amendment period. The correct process will depend on the type of error and when it is discovered.

Correcting a mistake voluntarily is normally preferable to waiting for HMRC to identify it. SAS Accountants can review the original submission, calculate the adjustment and help provide the corrected information.

Late and Overdue Tax Returns

Missing a tax-return deadline can result in penalties even if there is no tax to pay. Further charges and interest may arise when the return remains outstanding or the liability is paid late.

Ignoring an overdue return generally makes the situation more difficult. Filing it promptly establishes the actual tax position and may prevent further penalties from accumulating.

Where records are incomplete, an accountant can help reconstruct income and expenses using available bank statements, invoices and third-party documents.

SAS Accountants assists with overdue personal and company returns, helping clients organise their records and understand the resulting tax, interest and penalties.

Support with HMRC Enquiries

HMRC may open an enquiry when it wants to examine figures included in a return. This does not automatically mean that deliberate wrongdoing is suspected, but the request should be handled carefully.

The taxpayer may be asked to provide bank statements, invoices, calculations or explanations supporting particular entries. Responses should be complete, accurate and provided within the requested timescale.

SAS Accountants can review HMRC correspondence, organise the relevant evidence and communicate with the department when properly authorised. Professional representation can reduce uncertainty and help ensure that replies address the questions raised.

Tax Planning Beyond the Return

Preparing a return records what has already happened. Tax planning considers what may be done before the next financial decision or year-end.

Depending on your circumstances, planning could involve reviewing business expenditure, pension contributions, capital purchases, property transactions or the way profits are withdrawn from a company.

Tax planning does not mean avoiding legitimate responsibilities. It means organising financial affairs efficiently and making proper use of available allowances and reliefs.

SAS Accountants combines return preparation with forward-looking advice so clients can plan for future payments and avoid preventable surprises.

Why Choose SAS Accountants?

SAS Accountants provides tax return services for sole traders, landlords, CIS subcontractors, partnerships, company directors, individuals and limited companies.

The team can assist with record reviews, allowable expenses, tax calculations, electronic submissions, payments on account and Making Tax Digital. Support is also available for corrections, overdue returns and HMRC enquiries.

Clients receive clear explanations rather than simply a final tax figure. This personalised approach helps them understand their responsibilities, improve their records and make more confident financial decisions.

Get Professional Tax Return Support

Professional tax return services can save time, reduce errors and provide reassurance that your income and eligible expenses have been reported correctly.

Whether you need assistance with Self Assessment, a partnership return, a Company Tax Return or a complicated mixture of income sources, SAS Accountants can provide support tailored to your circumstances.

Contact SAS Accountants on 0330 133 0278 to discuss your tax return requirements.

Frequently Asked Questions
What tax return services does SAS Accountants provide?

SAS Accountants can assist with Self Assessment, sole-trader accounts, landlord returns, CIS tax returns, partnership returns, directors’ personal returns and Company Tax Returns. Support is also available for corrections, overdue filings and HMRC enquiries.

When is the Self Assessment deadline?

For the 2025–26 tax year, paper returns are generally due by 31 October 2026. Online returns and the corresponding payment are normally due by 31 January 2027. New taxpayers will usually need to notify HMRC by 5 October 2026.

What information should I give my accountant?

You should provide details of every relevant income source, along with expense receipts, bank statements, property documents, CIS statements, dividend vouchers and HMRC correspondence. Your accountant can provide a checklist based on your circumstances.

Can SAS Accountants help with an overdue tax return?

Yes. SAS Accountants can help organise incomplete records, prepare outstanding returns and explain any tax, interest and penalties due. Dealing with the matter promptly may help prevent additional charges.

Can an accountant reduce my tax bill?

An accountant can identify legitimate expenses, allowances and reliefs that may reduce the amount payable. Every claim must be accurate, supported by suitable evidence and compliant with current UK tax legislation.