The Small Business Owner's Year-End Bookkeeping Checklist

The end of the tax year has a way of sneaking up on even the most organised small business owner. One minute it's January, and the next it's March and you're staring at eleven months of receipts wondering where to start.

Research consistently shows that a significant proportion of sole traders and small limited company directors leave their year-end accounts until the last minute, often resulting in rushed submissions, missed deductions, and accountancy bills that are higher than they need to be.

This checklist is designed for UK small business owners: sole traders, limited companies, and everyone in between.

Note: The UK tax year runs from 6th April to 5th April. Self Assessment tax returns must be filed online by 31st January. Corporation Tax returns for limited companies are due 12 months after the end of your company's accounting period.

1. Reconcile All Your Bank Accounts

Go through every bank account and credit card used for business purposes and make sure every transaction is recorded in your bookkeeping software. Check that your closing balances match your bank statements.

This includes PayPal, Stripe, and any other payment processors - not just your main bank account. Common causes of discrepancies include duplicate entries, transactions recorded in the wrong period, bank charges that weren't captured, and refunds or chargebacks that were missed.

This is the step most people skip or rush, and it's the one that causes the most problems later.

2. Make Sure All Income Is Recorded

Go through your records and confirm every payment received during the tax year is recorded. This includes:

•  Invoiced income - check every paid invoice is in your accounts

•  Non-invoiced income - cash sales or ad hoc payments

•  Grant income - generally taxable and must be included

•  Refunds received - these reduce your expenses rather than adding to income

Cross-reference against your bank statements to make sure nothing has been missed.

3. Chase Any Outstanding Invoices

Before you close out the year, make sure all your outstanding invoices are either paid or properly recorded as outstanding.

Send a statement to any clients with outstanding balances - year-end is a natural prompt for businesses to clear their payables, and a polite reminder often gets results that months of gentle chasing didn't.

If you have invoices that are very overdue and unlikely to be paid, you may be able to write them off as bad debt - your accountant can advise on this.

4. Collect and Organise All Your Receipts

Every business expense needs a receipt. Go through your records and make sure every transaction has supporting documentation. If you're missing anything, track it down or request a duplicate.

Many suppliers and retailers can issue duplicate receipts if you contact them with the transaction date and amount. If you're using Xero, receipts can be uploaded and attached directly to transactions. Tools like Dext make it easy to photograph receipts immediately and have them coded automatically - doing this in real time throughout the year is one of the most time-saving habits a small business owner can develop.

5. Review Your Expenses

Go through your expenses for the year and make sure everything is correctly categorised. Common categories include:

•       Office and admin costs

•       Travel and subsistence

•       Marketing and advertising

•       Software and subscriptions

•       Professional fees

•       Staff costs and subcontractors

•       Equipment and assets

•       Premises costs - rent, business rates, utilities (or a proportion of home costs if you work from home)

If you're unsure whether something is an allowable expense or how to categorise it, your bookkeeper or accountant is the right person to ask. Guessing tends to cause more problems than it solves.

6. Check Your Mileage Records

If you use your personal vehicle for business travel and claim mileage, make sure your mileage log is complete. HMRC allows 45p per mile for the first 10,000 miles and 25p per mile after that.

Your mileage log should record: the date of each journey, the starting and ending point, the purpose of the trip, and the number of miles. 'Various client visits' is not sufficient - HMRC expects specific detail. Apps like MileIQ or Driversnote can automate this if manual logging is something you've struggled to keep on top of.

7. Confirm Your VAT Position

If you're VAT registered, make sure all your VAT returns for the year have been filed and paid. Check that your VAT records reconcile with your bookkeeping records.

If you're not currently VAT registered, check where your turnover sits relative to the registration threshold, which is currently £90,000 for the 2025/26 tax year. If you've exceeded it or are likely to exceed it in the next 30 days, you are legally required to register. Missing the registration deadline comes with penalties.

8. Confirm Your Director's Loan Account (Limited Companies Only)

If you're a limited company director, check your director's loan account (DLA) and make sure it's correctly recorded. If the company owes you money, that's a credit balance and is generally straightforward. If you owe the company money, a debit balance, there are tax implications your accountant needs to be aware of, particularly if the balance exceeds £10,000.

9. Set Aside Money for Your Tax Bill

This one catches people out every year. If you haven't been setting aside money for tax throughout the year, do a rough calculation of what you're likely to owe and make sure that money is ring-fenced.

As a rough guide for the 2025/26 tax year:

•  Sole traders should set aside approximately 20–30% of their profits for Income Tax and Class 4 National Insurance contributions

•  Limited company directors typically pay a combination of salary and dividends. Corporation Tax on company profits is currently 19–25% depending on profit level

Speak to your accountant for a more accurate figure based on your specific situation.

10. Prepare a Clean Handover for Your Accountant

If you use an accountant, get your records in order before you hand them over - accountants typically bill by the hour, and time spent sorting out disorganised records is money you could avoid spending.

Before you hand your records over, make sure you can provide:

•       Reconciled bank statements for all accounts

•       All income recorded and categorised

•       All expenses recorded with receipts attached

•       A list of outstanding invoices (debtors) and bills (creditors)

•       Mileage records for the year

•       Details of any assets purchased or disposed of

•       Payroll records if you have employees

•       Details of any personal drawings or director's loan transactions

11. Plan for the Year Ahead

Year-end is also a good time to look forward. What worked this year? What didn't? Are your bookkeeping systems actually working for you, or are they causing more stress than they solve?

Ask yourself honestly: did you stay on top of your records this year, or did it become a source of stress? For most small business owners, the answer is some combination of better habits, better tools, and, often, getting professional help before the records get out of hand rather than after.

Behind on Your Books? We Can Help.

If your books are behind, your receipts are in a shoebox, or you just don't have the time to work through this list yourself - that's exactly what we're here for.

Hollie, our qualified bookkeeper at The Social Sphere, works with small businesses across Essex, Hertfordshire, Suffolk, Cambridgeshire, and the wider UK using Xero. Whether you need a one-off catch-up, ongoing monthly bookkeeping, or someone to prepare your records ready for your accountant, we can help.