A letter or email from HMRC can unsettle even a well-run business. Knowing the top warning signs of an HMRC enquiry helps you deal with potential issues early, keep the right evidence and respond calmly if questions arise. An enquiry does not automatically mean HMRC believes you have done something wrong. It may be a routine check, a targeted review or a request for clarification. The difference often lies in how prepared your records are.

For owner-managed businesses, sole traders, landlords and higher-income taxpayers, the best protection is not last-minute paperwork. It is accurate bookkeeping, sensible tax planning and regular review throughout the year.

What is an HMRC enquiry?

An HMRC enquiry is a formal examination of a tax return or other tax submission. It can relate to Self Assessment, corporation tax, VAT, PAYE or another area of tax compliance. HMRC may ask for records, explanations, calculations and supporting documents before deciding whether the return is correct.

Some enquiries are selected at random. Others are prompted by information HMRC already holds, patterns in a return, third-party data or figures that appear inconsistent with previous years. A query can be narrow and focused on one point, or wider where HMRC believes more of the return needs checking.

The practical point is simple: do not ignore correspondence or assume a quick informal reply will always be enough. Deadlines matter, and an incomplete response can turn a manageable question into a longer, more expensive process.

Top warning signs of an HMRC enquiry

There is no public checklist that confirms an enquiry is coming. HMRC uses a range of data and risk assessments, and even perfectly compliant taxpayers can be selected. However, the following situations are common reasons for questions and deserve closer attention.

Figures that do not match the wider picture

A sudden fall in profit, a sharp increase in expenses or a major change in turnover is not a problem by itself. Businesses change direction, lose customers, invest in equipment and face rising costs. But where the figures differ markedly from earlier returns or typical results in the sector, HMRC may want an explanation.

For example, a café reporting stable card sales but substantially lower VATable takings needs a clear record of why. A consultant claiming high travel costs while working mainly from home should be able to show that the journeys were wholly and exclusively for the business. The issue is not whether a figure looks unusual. It is whether the figure can be evidenced.

Income missing from a return

HMRC receives information from many sources, including employers, banks, property agents, online platforms, Companies House and other government systems. Income that is omitted, reported late or does not align with this information can prompt a query.

This particularly affects directors who receive salary, dividends, benefits or loans from their company, as well as landlords with rental income and self-employed individuals taking payments through several channels. Cash sales and informal payment arrangements require just as much care as card or bank transactions. If money has come into the business, there should be a clear accounting trail for it.

Expense claims that are personal, rounded or poorly supported

Expenses are a regular area of enquiry because the rules can be misunderstood. A cost must have a genuine business purpose, and the business element should be claimed where an expense has mixed personal and commercial use.

Repeated round-sum claims, large entertainment costs, unclear motor expenses and frequent payments to a director without supporting records can all raise questions. This does not mean a legitimate claim should be avoided. It means receipts, mileage logs, invoices and a short explanation should be retained while the details are fresh.

For limited companies, it is also sensible to review the director’s loan account regularly. An overdrawn or unexplained balance can create tax consequences and can be harder to resolve once the year-end has passed.

VAT returns that do not agree with accounts or sales records

VAT is data-heavy and time-sensitive, making it a frequent focus for checks. Common warning signs include late VAT returns, repeated repayment claims, unusually low output VAT, changes in the VAT liability of sales, or differences between VAT returns and annual accounts.

Errors are often caused by process rather than intent. A business may use the wrong VAT code, miss sales invoices, reclaim input VAT without valid evidence, or fail to account correctly for deposits and credit notes. The right treatment depends on the transaction, so guessing is rarely a good commercial decision.

Regular bookkeeping and reconciliation of sales, purchases, bank transactions and VAT control accounts make discrepancies easier to spot before a return is filed. This is also increasingly relevant as Making Tax Digital places greater emphasis on digital records and a reliable VAT return process.

Losses, low profits or lifestyle inconsistencies

Making a loss is not evidence of wrongdoing. New businesses can take time to become profitable, and established businesses can experience difficult trading periods. However, repeated losses alongside significant personal spending, asset purchases or lifestyle indicators that appear inconsistent with declared income may lead HMRC to ask how those costs were funded.

The same applies where a business consistently reports very low profits while turnover, staffing or visible activity suggests a different scale of operation. A clear explanation may be available, such as loans, savings, one-off investments or a temporary downturn. Good records allow that explanation to be made quickly and credibly.

Late filing, amendments and inconsistent record keeping

One late return will not necessarily trigger an enquiry, but persistent late filing, frequent amendments and recurring errors can make HMRC look more closely. Repeated corrections may suggest that the underlying records are not being kept properly.

This is where a year-round relationship with an accountant can make a practical difference. Waiting until the filing deadline to reconstruct a year of transactions creates pressure and increases the chance of omissions. Monthly or quarterly review gives business owners clearer information for decisions as well as better tax compliance.

Transactions between connected parties

Payments between a business, its directors, family members or related companies are legitimate in many circumstances, but they should be documented and priced appropriately. Examples include loans, rent, management charges, wages, dividends and the transfer of assets.

HMRC may ask whether a payment was genuinely for the stated purpose, whether it was authorised and whether the tax treatment is correct. Keep agreements, board minutes where appropriate, invoices and evidence of payment. Informal arrangements can be commercially sensible at the time, but they are difficult to explain years later without paperwork.

What to do if HMRC contacts you

Start by checking exactly what HMRC is asking for, which period is under review and the response deadline. Keep copies of all correspondence and do not alter or discard records. Gather the requested information methodically, including bank statements, invoices, bookkeeping reports, contracts and calculations where relevant.

It is usually better to provide a clear, accurate response than to send a large volume of unorganised documents. If something was reported incorrectly, taking advice early can help you understand the position and make a considered disclosure. Trying to explain an issue away without checking the facts can create further complications.

Do not overlook the scope of the enquiry. A full enquiry can allow HMRC to examine the whole return, while an aspect enquiry is limited to specific points. HMRC may also ask questions beyond the initial issue if the evidence suggests a wider concern. The approach should therefore be proportionate, but thorough.

Build records that stand up to questions

Good records are not simply a compliance requirement. They give you a clearer view of cashflow, margins, tax liabilities and the financial health of the business. Keep business and personal spending separate, reconcile bank accounts regularly and retain invoices and receipts in an organised digital system.

For directors, make time to review salary, dividends, expenses and loan account movements before the year-end rather than after it. For sole traders and landlords, keep income and property costs up to date throughout the year. A small amount of routine discipline is far easier than rebuilding evidence when HMRC is already asking questions.

If correspondence arrives, a calm and organised response gives you the strongest starting point. The most useful next step is to review the facts early, ask for professional support where needed and use the experience to improve the financial systems that support your business growth.

For many owner-managers, the company accounts deadline becomes urgent only when a reminder arrives or a filing date is close. That is understandable when you are focused on customers, staff and cashflow, but leaving statutory accounts until the final weeks can create unnecessary pressure, missed opportunities and avoidable penalties.

For a private limited company, annual accounts are more than a Companies House requirement. They show how the business has performed, support the corporation tax process and give directors useful information for decisions on drawings, dividends, investment and growth. A little forward planning makes compliance easier and turns the year-end into something more valuable than a form-filling exercise.

What is the company accounts deadline?

Most private limited companies must file their accounts with Companies House no later than nine months after their financial year end. If your company’s accounting period ends on 31 March, for example, the usual filing deadline is 31 December that year.

This deadline is for accounts filed at Companies House, not for payment of corporation tax or filing the company tax return with HMRC. These obligations are closely connected, but their dates differ. Mixing them up is one of the most common reasons directors believe everything is in hand when an important deadline has already passed.

The deadline is different for a company’s first accounts. In most cases, first accounts are due 21 months after incorporation, or three months after the accounting reference date, whichever is later. Public limited companies generally have six months after their accounting period ends to file. Special circumstances can apply where an accounting reference date has changed, so it is sensible to check the company’s specific filing date rather than relying on a general rule.

The other dates directors need to track

A company normally needs to pay corporation tax nine months and one day after the end of its accounting period. Its corporation tax return is usually due 12 months after the end of that accounting period. The tax return is filed with HMRC, whereas statutory accounts are filed with Companies House.

There may also be VAT returns, PAYE reporting, confirmation statements and personal self-assessment responsibilities to consider. For directors who receive dividends or have other income outside payroll, these dates can overlap. Keeping one clear compliance calendar is often far more effective than trying to remember each obligation separately.

Why late accounts cost more than a penalty

Companies House applies automatic late filing penalties. For a private company, the current penalties start at £150 when accounts are filed up to one month late, rising to £375 for more than one month and up to three months late. They increase to £750 for more than three months and up to six months late, and £1,500 once accounts are more than six months overdue.

If accounts are filed late in two consecutive financial years, the penalty is normally doubled. The financial cost can therefore become significant for a small business, particularly when it arrives alongside corporation tax, VAT or other seasonal demands on cash.

There is a wider commercial cost too. Late accounts can affect the company’s public record, create concern for lenders and suppliers, and delay discussions about finance. More importantly, a rushed year-end often means directors are making decisions with old or incomplete information. That can make it harder to spot falling margins, rising overheads or customers who are taking too long to pay.

Prepare well before your financial year end

The easiest way to meet the company accounts deadline is not to treat it as a nine-month task. Good accounts are built steadily throughout the year through accurate bookkeeping, regular bank reconciliations and timely review of the numbers.

Ideally, directors should know before the year end whether records are complete and whether any issues need attention. This might include missing purchase invoices, unreconciled transactions, director’s loan account movements, stock records or expense claims. Resolving these items while the detail is still fresh is quicker than trying to reconstruct them months later.

A useful starting point is to agree a timetable shortly after your year end. Your accountant can explain what records are needed, when they should be supplied and which matters need a director’s input. The work can then be completed in good time, leaving space to review the figures properly instead of simply approving accounts to meet a deadline.

Records that commonly delay accounts

Bank statements alone rarely tell the full story. Accounts can be delayed by gaps in sales records, incomplete expense evidence, unclear payments between the company and director, or bookkeeping that has not been reconciled to the bank.

Other areas deserve particular attention. If the company owns equipment, vehicles or property, the treatment of assets and finance arrangements needs to be correct. If it has taken out loans, paid dividends, traded with connected businesses or changed its VAT position, those transactions may require further review. These are normal issues for growing businesses, but they are easier to manage when raised early.

Accounting software can help by keeping invoices, bank feeds and financial reports in one place. However, software is only as reliable as the information entered into it. Regular review by someone who understands your business remains valuable, especially where profitability, tax planning or cashflow is concerned.

Use the accounts to make better decisions

Statutory accounts look backwards, but the conversation around them should look forward. Once the final figures are available, directors have an opportunity to ask practical questions: Which services or products generated the best return? Has gross profit moved in the right direction? Are overheads increasing faster than turnover? Is the business collecting money promptly enough?

The answers can shape the next 12 months. A business that is profitable on paper but short of cash may need stronger credit control, revised payment terms or a rolling cashflow forecast. A company with healthy profits may need to consider future tax liabilities, pension contributions, investment plans or the most suitable timing for dividends. There is no one-size-fits-all answer, as the right approach depends on the company’s objectives, reserves and the director’s wider personal tax position.

This is where year-round accountancy support can make a meaningful difference. Instead of receiving accounts long after the period has ended and filing them without discussion, directors can use up-to-date management information to address problems earlier and act on opportunities sooner.

What to do if your accounts deadline is close

If the deadline is approaching and your records are not ready, act straight away. Do not assume that starting the work before the deadline prevents a penalty. Companies House measures whether acceptable accounts have been filed by the due date.

Gather the core records first: bank statements, sales and purchase information, payroll records, VAT returns, finance agreements, details of assets and any transactions involving directors. Be open about anything that is missing or unclear. An experienced accountant can help identify priorities, but they need a complete picture to give practical advice.

In limited circumstances, a company may apply to extend its filing deadline, usually where an event outside the company’s control has caused serious disruption. Such applications must be made before the filing deadline, and an extension should never be treated as routine. It is much safer to plan early and keep the accounts process moving.

Make compliance part of a stronger business plan

Meeting your filing obligations matters, but it should not be the only ambition. Timely accounts give you a reliable platform for budgeting, forecasting and tax planning. They also create the discipline of looking closely at how the business is performing, rather than relying on a bank balance or a general sense that things are going well.

For Manchester businesses balancing day-to-day demands with plans to grow, having an approachable adviser makes this process less daunting. RK & Co works with directors throughout the year to keep records organised, meet key deadlines and turn financial information into practical, simple advice.

The best time to deal with your next accounts is not when the deadline is a few days away. Set the timetable now, keep the information current and use the conversation around your figures to make the next year more profitable and more secure.

A rental property can look profitable on paper while producing a surprisingly large tax bill. Knowing the best deductible expenses for landlords helps you calculate the profit HMRC actually taxes, rather than paying tax on income that has already gone towards running and maintaining your property.

The central rule is straightforward: an expense must be incurred wholly and exclusively for the purpose of the rental business. In practice, the difficult part is separating genuine running costs from capital improvements, private spending and costs that receive tax relief in a different way. Good records make that judgement far easier and give you a clearer view of what each property is really earning.

Best deductible expenses for landlords: the main categories

Most allowable costs fall into a handful of practical categories. The expense must relate to the period when the property is available to let, not just when rent is being received. This matters where a tenant has moved out and you are actively preparing or marketing the property for a new tenancy.

Letting and property management costs

Letting agent fees, tenant-find fees, inventory costs, reference checks and property management charges are normally deductible. So are advertising costs for finding tenants and fees for preparing tenancy agreements, provided they relate to the ongoing letting business.

If you manage the property yourself, software subscriptions, a dedicated landlord telephone line and reasonable stationery costs may also qualify where they are genuinely used for the rental activity. Keep invoices and make a note where a cost has any mixed business and personal use.

Repairs, maintenance and safety work

Repairs are often among the most valuable allowable deductions. They keep the property in its existing condition rather than making it substantially better than before. Common examples include fixing a leaking roof, repairing a boiler, replacing broken locks, redecorating between tenants, clearing drains and repairing damaged plasterwork.

Required safety work is generally deductible too. This can include annual gas safety checks, electrical inspections, smoke and carbon monoxide alarm maintenance, and remedial work needed to meet letting standards.

The distinction between a repair and an improvement is crucial. Replacing worn kitchen cupboard doors may be a repair. Installing a significantly larger, higher-specification kitchen as part of a refurbishment is more likely to be capital expenditure. Capital costs are not usually deducted from rental income, although they may be relevant when calculating Capital Gains Tax on a future sale.

Like-for-like replacements can still use modern materials. Replacing old single-glazed windows with standard double glazing, for example, will often be treated as a repair where it is the modern equivalent rather than a meaningful upgrade to the property.

Insurance, service charges and running bills

Landlord insurance premiums are normally allowable, including buildings, contents and landlord liability cover. Where you pay them, service charges, ground rent and estate management charges for a leasehold property are usually deductible as well.

You can also claim utility bills, council tax and broadband where you remain responsible under the tenancy agreement. This is common in houses in multiple occupation and properties let on an inclusive-bills basis. The key point is that the payment needs to be a cost of generating your rental income, not a private household expense.

Professional fees and financial administration

Accountancy fees for preparing rental accounts and self-assessment tax returns are normally deductible. Legal fees may be allowable where they relate to short leases or the day-to-day management of the tenancy, such as pursuing rent arrears. However, legal fees connected with buying, selling or extending the lease of a property are usually capital costs instead.

Bank charges on an account used for the rental business can be claimed. Bookkeeping fees and reasonable costs of accounting software may be deductible too. For landlords with several properties, consistent bookkeeping is not simply a compliance task. It shows which properties are absorbing repair costs, whether rents need reviewing and whether cash reserves are sufficient for future works.

Mortgage interest: relief works differently for individuals

Mortgage interest is an area that still catches many landlords out. Individual landlords and most partnerships cannot deduct residential mortgage interest from rental income in the same way as other expenses. Instead, they normally receive a basic-rate tax reduction calculated at 20% of qualifying finance costs.

This means higher-rate and additional-rate taxpayers may receive less relief than they expect. It can also affect the income figure used for matters such as child benefit charges and personal allowance tapering. Mortgage capital repayments are never deductible.

A limited company that owns a residential investment property is taxed under different rules. Interest is generally a deductible company expense, subject to the corporate interest restriction rules where relevant. That does not automatically mean incorporation is the right answer. Tax on extracting profits, mortgage availability, stamp duty land tax and the cost of transferring existing properties all need proper consideration.

Replacing furniture and appliances in a let property

For most residential landlords, relief is available when you replace a domestic item that has been provided for a tenant’s use. This can include beds, sofas, carpets, curtains, fridges, washing machines, crockery and televisions.

The relief is normally based on the cost of a like-for-like replacement, including delivery and installation, less any amount received for selling the old item. If you choose a more expensive upgrade, relief is usually limited to the cost of a modern equivalent of the original item.

There is an important timing point. The initial cost of furnishing a newly acquired or previously unfurnished property is usually capital expenditure, so it is not covered by replacement relief. The allowance applies when an existing domestic item is replaced.

Travel, home working and other costs that need care

Travel costs can be deductible when they are wholly and exclusively for managing the rental business. Visiting a property to inspect repairs, meet contractors or deal with tenant matters may qualify. Keep a mileage log showing the date, destination and business reason for each journey.

However, regular travel from home to a separate office may be treated as ordinary commuting, and journeys with a private purpose need apportioning. Claims for home working, mobile phones and internet also need a reasonable basis. It is not sensible to claim the full household bill simply because you answer tenant messages from the kitchen table.

Pre-letting expenditure may be claimed if it would have been allowable had it been incurred while the property business was already running. Costs incurred before the first tenant moves in therefore need careful review, especially where they form part of a wider renovation or purchase project.

Costs landlords cannot deduct from rental profits

A clear list of exclusions can prevent expensive mistakes. The following costs are commonly claimed in error:

• the purchase price of the property and associated acquisition costs;
• mortgage capital repayments;
• improvements that add value or substantially change the property;
• personal expenses or the private share of mixed-use costs;
• tax on your rental profits, including your own income tax payments; and
• legal and professional fees directly connected with buying or selling a property.

These costs may still have tax relevance later, particularly for Capital Gains Tax, so retain the paperwork. “Not deductible against rent today” does not mean “throw the receipt away”.

Keep records that support better decisions

Receipts alone are not enough. Record the date, supplier, property, amount, VAT where applicable and a short explanation of what the expense was for. Photograph major repair work before and after completion, particularly where the line between repair and improvement could be questioned.

A separate bank account is not legally required for most individual landlords, but it is often worthwhile. It avoids personal and property transactions becoming tangled together and makes the annual tax return considerably easier to prepare. Landlords should normally retain records for at least five years after the 31 January submission deadline for the relevant tax year.

Also review your position when circumstances change. The favourable Furnished Holiday Lettings tax regime ended from April 2025, so owners who previously relied on its rules should reassess their reliefs and forecasts. A major refurbishment, a remortgage, a move into higher-rate tax or the purchase of another property are all points at which early advice can protect cash flow.

The best approach is to treat deductible expenses as part of managing a rental business properly, not as a last-minute exercise before your tax return is due. If you are unsure whether a significant cost is a repair, an improvement or a finance cost, speak to an adviser before categorising it. RK & Co can help landlords turn accurate property records into practical tax planning and a more reliable picture of rental profitability.