How Sole Trader Year-End Accounts Connect to the Time Records You’re Already Keeping
News
Most sole traders treat time logs as invoicing tools. They’re also source documents for your year-end accounts. Gaps in them create problems your accountant will have to work around.
From April 2026, that matters even more. Under Making Tax Digital for Income Tax, many sole traders now report to HMRC every quarter, not just once a year. Your records have to be accurate all year round, not just tidied up in January.
What a Sole Trader Year-End Actually Is
A sole trader year-end is the date you close off 12 months of trading records. From that date, your accountant begins the sole trader accounts year end process, building a profit and loss account that shows income earned, expenses claimed, and net profit. That net profit figure is what HMRC taxes as Income Tax and National Insurance, through Self Assessment or, if you’re in scope, Making Tax Digital for Income Tax.
The Basis Period Reform in Plain Terms
From 6 April 2024, HMRC moved all sole traders onto a tax-year basis. Profits are now taxed on what you earned between 6 April and 5 April, regardless of when your accounting period ends. The transitional year was 2023-24, and the tax-year basis is now the permanent rule.
If your year-end falls on any date other than 31 March or 5 April, your accountant has to apportion income and expenses across two periods. That calculation depends entirely on your time and billing records being accurate for both periods.
Making Tax Digital for Income Tax: What Changed in April 2026
Making Tax Digital (MTD) for Income Tax went live on 6 April 2026. It applies first to sole traders and landlords whose qualifying income (gross turnover from self-employment and property combined) was over £50,000 in the 2024-25 tax year. HMRC calls it the biggest change since Self Assessment launched.
If you’re in scope, you must:
Keep digital records of your business income and expenses in HMRC-recognised software
Send a quarterly update to HMRC from that software
Submit your end-of-year return by 31 January following the tax year
The threshold drops in stages:
From
Qualifying income over
6 April 2026
£50,000
6 April 2027
£30,000
6 April 2028
£20,000
Quarterly updates follow the tax year. The first quarter runs 6 April to 5 July, with the update due 7 August. Check the remaining dates for your business on GOV.UK.
For time-based businesses, this changes the rhythm of record-keeping. Hours, invoices and subcontractor payments need to be reconciled and entered every quarter. A gap you’d previously have fixed at year-end now shows up in a quarterly update first. New late submission and late payment penalties also apply under MTD.
31 March or 5 April: Which Year-End Makes Record-Keeping Simpler
HMRC treats 31 March as equivalent to 5 April for tax purposes. Either date means your accounting period and the tax year line up, so you avoid apportionment entirely.
Most invoicing and time tracking tools default to calendar months, so a 31 March cut-off fits naturally. It also lines up with MTD’s quarterly cycle, which runs on the tax year. A September year-end means your records have to be split mid-stream. That increases the chance of hours or invoices being assigned to the wrong period.
What Records HMRC Expects You to Keep
HMRC requires sole traders to keep records of all income received, business expenses, invoices issued, and bank statements. If you buy and sell goods, stock records apply too. You must keep these for five years after the 31 January filing deadline for the relevant tax year.
If you’re within MTD, those income and expense records must be kept digitally, in or linked to MTD-compatible software. Paper records and manual year-end spreadsheets are no longer enough on their own.
Where Time Records Fit Into Year-End Accounts
For a service-based sole trader, your time log is the evidence behind every sales figure. A timesheet entry showing date, client, hours worked, and rate maps to an invoice. That invoice goes into your turnover total, and under MTD into your quarterly update. If the time record is wrong, the income figure is wrong.
Time records also support the expense side. If you pay a subcontractor or casual worker, the hours they logged justify the payment you’re claiming as a business cost. Without that record, the expense is harder to substantiate.
Common Record-Keeping Gaps That Cause Year-End Problems
The most common issue is time logs that don’t match invoices. If you billed 40 hours in March but your timesheet shows 35, your accountant has to ask questions. HMRC may ask the same ones.
Records that cover the wrong period cause a different problem. If your year-end is 31 March but your time tracking tool runs on a calendar year, you’ll have a gap or an overlap every year. Under MTD, the same mismatch can also distort each quarterly update.
How to Make Your Records Year-End Ready
Check whether MTD for Income Tax applies to you now or from April 2027 or 2028, using the checker on GOV.UK.
If it does, sign up and choose MTD-compatible software that your time tracking and invoicing tools can feed into.
Confirm your year-end date and make sure your time tracking and invoicing tools reflect it.
Reconcile time logs against invoices every month, and before each quarterly update if you’re within MTD.
Check that subcontractor or worker hours match the payments you’ve recorded as expenses.
Export a clean time report covering the full accounting period before you hand anything to your accountant.
Note any gaps in the records and the reason for them. If HMRC asks, a documented explanation is better than silence.
The Practical Takeaway
Accurate time records produce accurate invoices. Accurate invoices produce accurate quarterly updates and accounts. Check that your year-end date is set to 31 March or 5 April, and that your time logs cover the full period without gaps.
If your records are in good shape, hand them to your accountant. If they’re not, fix the gaps now. If you’re within MTD, waiting until January is no longer an option, because each quarter’s figures go to HMRC as you go. A qualified accountant can advise on anything specific to your situation, particularly a non-standard year-end, overlap profit relief, or your MTD start date.
Frequently Asked Questions
What records does a sole trader need to keep for year-end accounts?
You need records of all income received, invoices issued, business expenses, and bank statements. If you have workers or subcontractors, keep their time logs and payment records too. HMRC requires you to hold these for five years after the 31 January filing deadline for the relevant tax year. If you’re within MTD, income and expense records must be kept digitally.
Does Making Tax Digital apply to me?
From 6 April 2026, it applies to sole traders and landlords with qualifying income over £50,000. That drops to over £30,000 from April 2027 and over £20,000 from April 2028. The GOV.UK checker will confirm your start date.
Do I need to keep time records as a sole trader?
Yes, if your income comes from billable hours. Time records are the source data behind your invoices, and invoices are how HMRC verifies your declared turnover. Without them, any discrepancy between what you billed and what you declared is difficult to explain.
How do timesheets help with Self Assessment and MTD?
Timesheets connect hours worked to invoices raised. That connection supports the income figures in your return and, under MTD, in each quarterly update. They also justify labour costs claimed as expenses, which matters most when you pay subcontractors or casual workers.
What happens if my time records are incomplete at year-end?
Your accountant may have to estimate figures, which creates risk if HMRC queries your return. Expenses without supporting records may need to be reduced or removed. Reconstructed records are acceptable to HMRC in some cases, but they attract more scrutiny than records kept at the time.
Louis Nelson, an expert in productivity and time management solutions, brings a wealth of knowledge to the field of efficient work processes. With a background in industrial psychology and over a decade of experience in software development, Louis offers insightful and practical advice for optimizing time use in various industries.
