Tax Year 2023/24 Rates & Deadlines for UK Businesses

You're running the business, invoices are going out, suppliers need paid, and HMRC is suddenly back on your screen asking for figures from a period that already feels old. That's usually when the tax year 2023/24 stops being an abstract label and becomes a live problem.

For some people, it's a sole trader trying to work out what belongs on a Self Assessment return. For others, it's a company director realising the old salary-and-dividends routine doesn't land the same way now. Landlords often hit a different version of the same issue. Rental income looks straightforward until reduced allowances, filing deadlines and patchy records turn it into a time drain.

The trouble is that most guidance either reads like HMRC wrote it for HMRC, or it lists figures without explaining what to do next. Busy owners don't need more tax jargon. They need to know what changed, what matters, what can wait, and what will cost them money if ignored.

That's the practical purpose of this guide. It deals with the tax year 2023/24 as a working business owner experiences it: through deadlines, cash flow, payroll decisions, dividend planning, property income, and compliance admin that has to be done whether you enjoy it or not.

Your Guide to Navigating the 2023/24 Tax Year

By the time most owners look closely at the tax year 2023/24, they're already under pressure. The return needs filed, records aren't as tidy as they should be, and there's a nagging sense that something changed since the previous year but not enough time to sit and decode it properly.

That pressure shows up in different ways. A sole trader might be asking whether online platform income needs to go in. A landlord might be checking whether a gain that used to sit inside the exemption now creates tax. A limited company director might be asking why the familiar dividend approach suddenly feels less efficient.

The common thread is simple. The rules didn't become easier, but owners still have to make decisions quickly.

Practical rule: Good tax work starts with sorting the return into decisions, deadlines and records. If you mix those three together, everything feels harder than it is.

For the tax year 2023/24, the main issues weren't only the headline rates. The bigger practical story was frozen thresholds, tighter dividend and capital gains allowances, and stricter consequences for getting filing wrong or leaving it too late. Those points affected people differently depending on how they traded.

If you're a sole trader, the focus is usually complete income capture and making sure expenses are supportable. If you run a limited company, the question is often how to extract money efficiently without walking into avoidable tax. If you're a landlord, the issue is usually less about rates and more about whether your reporting is complete and whether a disposal now has a tax cost where it previously might not have done.

That's where a clear, business-type view matters. Tax only becomes useful when you can connect the rule to the action.

Defining the UK Tax Year 2023/24

The tax year 2023/24 ran from 6 April 2023 to 5 April 2024. That date range catches people out every year because it doesn't follow the calendar year and it doesn't match a standard company accounting year either.

What period this actually covers

If you're dealing with personal tax, that 6 April to 5 April window is the starting point. It's the period used for income that appears on Self Assessment returns, including trading income, rental income, dividends received personally and other taxable personal income that falls within that year.

For business owners, that matters because the same activity can cross more than one tax timetable. A limited company has its own accounting period and Corporation Tax timetable, but the director still has a personal tax year for salary, dividends and any other income drawn personally.

That's why owners often feel they're answering two different sets of tax questions at once. In many cases, they are.

Who needs to pay attention

This tax year matters if you fall into any of these groups:

• Sole traders with business income taxed personally through Self Assessment
• Partners in partnerships who report their share of partnership profits personally
• Landlords with UK property income to report
• Limited company directors and shareholders who receive salary, dividends or other benefits personally
• Small employers dealing with payroll, PAYE and related reporting
• VAT-registered businesses preparing and filing VAT returns during or after the period

The practical point is that “tax year” usually means personal tax first. That doesn't make it irrelevant to companies. It means company owners have to think on both sides of the fence: company compliance and personal compliance.

Why the distinction matters in practice

A sole trader and a company director can earn similar amounts and still face different admin, timing and planning issues. The sole trader's business profit feeds directly into personal tax reporting. The company director has a layer in between, because company profits, payroll, dividends and personal reporting all interact.

If you're unsure whether something belongs in the company records, your personal return, or both, don't guess. That's where errors start.

For landlords, the tax year 2023/24 also matters because rental income is personal tax territory unless the property is held through a company structure. For that reason, many landlords ended up facing the same deadline pressure as sole traders, even if they didn't see themselves as “in business” in the usual sense.

Key Tax Rates and Allowances

A lot of 2023/24 tax bills went up without the owner doing anything unusual. Profit rose. Rent rose. Salary crept up. The tax bands did not keep pace, and some allowances became smaller.

For a busy owner, the point is not memorising every rate. It is knowing which figures change the decisions you need to make before filing.

Income tax basics for 2023/24

For taxpayers in England, Wales and Northern Ireland, the Personal Allowance remained £12,570 and the higher-rate threshold remained £50,270 for 2023/24, as set out in HMRC's rates and thresholds for employers for 2023 to 2024. In practice, that meant more sole traders, landlords and company owners were pulled into higher tax bands as income increased.

Scotland used different income tax bands and rates for earned income in 2023/24. If you are Scottish resident for tax purposes, salary, pension and sole trade profit need a separate check against the Scottish bands. Dividend income still follows the UK-wide dividend rules.

That distinction matters. I often see directors assume a colleague on the same drawings will have the same personal tax result. Residency can change that.

What the frozen thresholds meant by business type

Frozen thresholds are not just a policy point. They affect day-to-day decisions.

• Sole traders: higher profits can push more income into higher-rate tax, even if the increase mainly reflects inflation and higher costs passed on to customers
• Limited company directors: salary and dividend planning needs a closer look because a static higher-rate threshold means personal tax can rise faster than expected
• Landlords: rent increases or a second source of income can move more of the profit into higher-rate tax, which also affects finance cost relief restrictions for some landlords

If your income increased in 2023/24, check whether the extra cash improved your post-tax position. In many cases, it did less than expected.

Quick comparison table

Use that table as a working checklist, not a reference sheet. If one of those rows applies to how you take income or dispose of assets, it deserves a review before the return is prepared.

Dividend and gains allowances

The Dividend Allowance fell to £1,000 for 2023/24, and the Capital Gains Tax Annual Exempt Amount fell to £6,000, according to HM Revenue and Customs guidance on tax on dividends and the government's Capital Gains Tax rates and allowances.

For a limited company director, that usually means the old pattern of taking dividends with minimal review is less efficient than it used to be. The allowance still helps, but it shelters less income.

For a landlord or investor, the lower gains exemption means a sale that would previously have sat within the annual limit may now create a tax charge and a reporting requirement. Timing, ownership split between spouses, and expected gains all matter more once the exempt amount is tighter.

VAT and the practical issue for growing firms

VAT usually becomes a problem before the return is filed. The question is whether turnover has already crossed the registration point, whether the business should register voluntarily, and whether the bookkeeping is clean enough to support quarterly submissions. If VAT is on your radar, review this guide to the VAT threshold for 2023/24 and compare it with your rolling 12-month turnover, not a rough year-end estimate.

What to check now

• Sole traders: confirm whether rising profits have pushed part of your income into a higher band
• Limited company owners: review salary and dividend mix before assuming last year's approach still works
• Landlords: check whether rental profit or a planned sale now creates more tax than expected
• Any growing business: monitor turnover monthly if VAT registration could be close

The numbers matter because they change action. If a rate or allowance affects how you pay yourself, sell an asset, or register for VAT, deal with it early rather than finding out through the tax return.

Major Tax Changes from 2022/23

A common 2023/24 mistake was simple. A business owner used the same pay, dividend or sale plan as 2022/23 and assumed the tax result would be broadly similar. In many cases, it was not.

Lower allowances meant less room for error

The main change from a practical point of view was the squeeze on allowances. For 2023/24, the Dividend Allowance reduced to £1,000 and the Capital Gains Tax Annual Exempt Amount reduced to £6,000, as noted earlier.

For a limited company director, that usually meant more of the same dividend pattern became taxable. If payroll stayed low and dividends rose with profits, the personal tax cost often increased faster than expected. The right answer was not always “take more salary” either. The company's profit level, Corporation Tax position, NIC cost and the director's wider income all had to be reviewed together.

For a landlord, the lower gains exemption mattered if a sale was planned or already in progress. A disposal that might previously have fallen within the exempt amount was more likely to create a reportable gain. That made record-keeping more important. Purchase costs, legal fees, capital improvements and ownership split all needed to be clear before contracts were exchanged.

For a sole trader, these changes often showed up less through dividends or gains and more through missed planning opportunities. If there were assets to sell, or investment income alongside trading profits, the smaller exemptions reduced the margin for casual year-end decisions.

The real issue was behaviour

The tax rules did not change enough to justify panic. They changed enough to punish autopilot.

That is the point busy owners usually care about. If last year's approach relied on tax-free allowances doing more work, 2023/24 required a fresh calculation. I saw this most often with directors who kept the same monthly salary and voted dividends in the usual way, without checking whether the combined company and personal tax result still made sense.

A short review would usually answer the practical question:

• Sole traders: check whether any asset sale, investment disposal or side income now creates tax where it did not before
• Limited company owners: review salary, dividends and retained profit together, not as separate decisions
• Landlords: confirm expected gains, allowable costs and ownership split before agreeing a sale

Corporation Tax changed the company planning conversation

For companies, the other major shift was the return of higher Corporation Tax rates for businesses above the relevant profit limits. That changed extraction planning because the company tax bill and the shareholder tax bill had to be looked at as one calculation, not two separate ones. If you need the rate mechanics, this guide to Corporation Tax rates of 19% or 25% explains where the split matters.

The trade-off was practical. Leaving profit in the company could save personal tax now, but increase Corporation Tax and delay access to cash. Taking more out could help with personal spending or debt, but trigger more dividend tax. There was no standard answer that suited every owner.

The same principle applied to compliance. A change in allowances is only useful if the records support the decision. Directors needed clean dividend paperwork. Landlords needed a proper cost history. Sole traders needed to separate business and personal transactions so year-end planning was based on reliable numbers, not estimates. If you are also trying to keep filing dates straight, these Umbrella Company self assessment tips are a useful reminder of how quickly small delays turn into larger admin problems.

Essential 2023/24 Filing and Payment Deadlines

Deadlines aren't just admin. In the tax year 2023/24, they were one of the biggest cost controls available to small business owners. File late and you don't just create hassle. You create penalties, interest and a longer clean-up job.

Self Assessment matters first for most owners

HMRC's deadline for online Self Assessment returns for the tax year 2023/24 was 31 January 2025, and missing it triggered an automatic £100 penalty, with additional daily penalties and tax-geared penalties building after 3, 6 and 12 months, according to the deadline and penalty summary covering 2023/24 filing. The same summary notes that 11.5 million Self Assessment returns were filed for 2023/24, which shows how many taxpayers are exposed to these rules.

That matters because owners often make the same mistake. They think, “I can't afford the bill yet, so I'll leave the return.” In practice, filing and paying are separate problems. If cash flow is tight, late filing usually makes the position worse, not better.

What to prioritise if you're behind

If you're dealing with a delay, the order of work should usually be:

1. Get the records together so the return can be prepared accurately.
2. File the return even if payment is still being worked through.
3. Deal with the balance due as a cash flow issue, not as a reason to miss the filing obligation.

That approach doesn't remove the tax due, but it can stop avoidable filing penalties from stacking up. For contractors and others with unusual income patterns, these Umbrella Company self assessment tips are also worth reviewing alongside your own records.

Company, VAT and payroll deadlines

For limited companies, the practical deadline set is broader than one date on a calendar. You need to monitor:

• Corporation Tax return timing against your company's accounting period
• Corporation Tax payment timing separately from the return itself
• VAT return submission and payment dates for each VAT period
• PAYE and payroll reporting deadlines throughout the year, not only at year end

Because those timings vary by business, the best method is a live compliance calendar rather than memory or diary notes spread across different devices. Stewart Accounting's guide to Self Assessment deadlines in the UK is a useful anchor point for the personal side of that calendar.

A short explainer can help if you're trying to get the sequence clear before filing season gets tight.

File on time, even when payment is difficult. Missing both creates two problems. Filing on time leaves you with one.

Your Tax Compliance Checklist by Business Type

A missed tax task looks different depending on the business. A sole trader usually feels it through a rushed Self Assessment return. A company director often feels it later, when money has already been taken out of the business and the paperwork does not support it. A landlord can have a return filed on time and still run into trouble because the rental figures do not reconcile.

Use the checklist that matches how you earn your income.

For sole traders and landlords

The main risk here is incomplete records. HMRC usually challenges gaps, mixed personal and business spending, and figures that do not match information it already holds from banks, agents or online platforms.

• Pull together every income source from invoices, bank statements, card processors, agent statements and platform reports.
• Separate business, property and casual side income so nothing gets buried in one total.
• Check that expenses are backed by evidence and are clearly business or rental related.
• Reconcile rental statements to bank receipts so you can explain timing differences, fees and deposits.
• Review drawings and personal spending if you use one bank account for everything.
• Start early enough to fix gaps while records can still be found.

Online platform income needs extra care for 2023/24. HMRC receives more third-party data than many owners expect, so anyone selling through marketplaces or earning through short-term letting platforms should keep clean records and make sure the return matches what those platforms report. If your admin is still too manual, better accounting software for UK businesses can reduce missed income and duplicate entries.

For limited company directors

The usual weak point is not the filing date. It is how money is taken from the company during the year.

• Review salary, dividends and any other withdrawals together so the mix still makes sense for 2023/24.
• Check the director's loan account regularly instead of leaving it until the year-end accounts stage.
• Make sure dividends were legal and documented with the right board minutes and vouchers.
• Keep personal costs out of the company records unless there is a clear business reason and supporting evidence.
• Match extraction plans to company profit and cash flow before taking funds out.

I often see directors create avoidable tax and accountancy work by paying themselves first and asking what it was later. That approach can turn a simple year end into a clean-up exercise involving dividends, loans, benefits or disallowed expenses.

For SMEs with staff and regular compliance duties

Here the problem is usually process. The business may know what has to be filed, but responsibility is spread across payroll, bookkeeping, operations and the owner.

• Keep payroll records and RTI submissions up to date for every pay run.
• Reconcile VAT as part of monthly bookkeeping so quarter end is a review, not a rebuild.
• Use one set of accounting records for management reporting and tax work, rather than separate spreadsheets.
• Maintain a single compliance calendar covering VAT, PAYE, year-end accounts, Corporation Tax and directors' personal returns.
• Assign each task to a named person and check that cover exists for holidays, illness and staff changes.
• Review control points monthly so errors are found before a deadline is missed.

Owner's test: If nobody can say who files what, and by when, the system is not under control.

The practical answer is usually simple. One bookkeeping system, one calendar, one approval routine, and regular review before filing dates arrive.

Conclusion: Key Takeaways for the 2023/24 Tax Year

The 2023/24 tax year has been less about brand-new taxes and more about pressure from frozen thresholds, smaller allowances and the usual filing dates arriving whether the records are ready or not. For a sole trader, that often means checking profits earlier so the January Self Assessment bill does not come as a surprise. For a limited company director, it means reviewing salary, dividends and any money taken from the company before year end, not after. For a landlord, it means keeping rental records complete and setting aside tax as income comes in.

The common thread is control. Good tax outcomes usually come from timely bookkeeping, clear records and decisions made before deadlines, not from trying to fix everything at the last minute. If you want better day-to-day visibility, the right accounting software for UK businesses can make that easier by keeping bookkeeping, reporting and filing information in one place.

Stewart Accounting Services handles Self Assessment returns, VAT, payroll, year-end accounts, Corporation Tax and practical tax planning for small businesses, landlords and directors. If your records are behind, deadlines are close, or your current setup no longer feels tax-efficient, getting advice early usually reduces the clean-up work and helps you make better decisions before the tax year rolls on.