7 Monthly Bookkeeping Checks That Prevent Year-End Problems
Published: 9 May 2026
Did you know most small business owners spend hours fixing bookkeeping problems at month-end that could have been avoided in minutes during the month?
The problem is rarely the accounting software. It is usually the habit of leaving receipts, invoices, reconciliations, and payroll checks until the last possible moment. By then, small mistakes have turned into bigger problems, cash flow is unclear, and deadlines are starting to create pressure.
This bookkeeping for beginners guide gives you a monthly bookkeeping checklist in the exact order that prevents errors from compounding. Where the steps differ between sole traders on a cash basis and limited companies on an accrual basis, each step clearly states the difference.
In This Article
- 1. Collect and File Every Receipt and Invoice
- 2. Categorise Every Transaction
- 3. Reconcile Your Bank Account
- 4. Review Outstanding Invoices and Chase Late Payments
- 5. Check Bills Due and Accounts Payable
- 6. Process Payroll and Submit PAYE
- 7. Check VAT Records and Prepare for MTD Quarterly Updates
- Final Thoughts
- Frequently Asked Questions
1. Collect and File Every Receipt and Invoice
What To Collect Each Month
Gather every sales invoice you issued, every purchase receipt and supplier invoice, and bank statements for all business accounts.
How To Store Them So Nothing Goes Missing
Photograph paper receipts the moment you receive them. HMRC accepts digital copies as valid evidence, so a photo at the point of purchase removes the risk of loss entirely.
If you are still building your system, the guide to setting up small business bookkeeping from scratch covers the foundation you need before running this workflow.
2. Categorise Every Transaction
Sole Traders: Cash Basis Is the Default
Since April 2024, the cash basis has been the default accounting method for self-employed sole traders under the Finance (No. 2) Act 2023. You record income when you receive the money and expenses when you pay them, not when invoices are raised. Confirm that every expense you categorise is wholly and exclusively for business use before including it in a tax claim.
Limited Companies: Accrual Accounting Is Mandatory
If you run a limited company, you must use accrual accounting. Income and expenses are recorded when earned or incurred, regardless of when cash is received or paid. This distinction changes how your monthly bookkeeping tasks work in practice, yet most guides ignore it entirely. Apply the correct VAT rate to each transaction at this stage if your business is VAT-registered.
| Sole Traders (Cash Basis) | Limited Companies (Accrual) | |
|---|---|---|
| Default from | April 2024 (Finance (No. 2) Act 2023) | Always mandatory — no alternative |
| Record income when | Money is received | Earned or invoiced |
| Record expenses when | Money is paid | Incurred or invoiced |
3. Reconcile Your Bank Account
How To Run Reconciliation
Match every entry in your accounting software to the corresponding line on your bank statement. Investigate discrepancies before moving on: duplicate entries, missing transactions, and miscategorised payments all need to be resolved. Save the completed reconciliation report as part of your monthly records and repeat the process for any credit card or secondary account.
Why Can This Step Not Wait Until the Year-End
4. Review Outstanding Invoices and Chase Late Payments
Check Your Aged Debtors List
Generate a list of all unpaid sales invoices and note how many days each is overdue. Send a payment reminder for any invoice that is seven or more days past its due date, and confirm that all payments received during the month are matched to their invoices in your system, with nothing left unallocated.
The Cash Flow Risk You Cannot Ignore
Profitable businesses fail because cash is tied up in unpaid invoices. A monthly review is the minimum needed to manage this risk. Flag any invoice that appears uncollectable after 90 days for write-off or escalation. The longer an overdue invoice sits unaddressed, the harder it becomes to recover.
5. Check Bills Due and Accounts Payable
Payments Due in the Next 30 Days
List all supplier invoices and bills due in the next 30 days. Confirm that recurring direct debits and standing orders are correctly recorded and categorised in your accounts. This prevents an untracked payment from appearing as an unexplained debit at next month’s reconciliation.
Subscriptions, Duplicates, and Credit Terms
Check that credit terms with suppliers are being managed within agreed limits. Flag any duplicate charges from subscriptions or utilities for querying before the next statement arrives. Catching duplicates monthly stops a small error from becoming a recurring one.
Note: If you are a sole trader with no employees, you can skip to Step 7.
6. Process Payroll and Submit PAYE (If You Have Employees)
What The FPS Submission Requires
Run payroll calculations and submit a Full Payment Submission (FPS) to HMRC on or before each payday. Record gross wages, employee PAYE, employee National Insurance contributions, and employer National Insurance in your accounts. Record pension contributions if auto-enrolment applies to your workforce.
Deadlines and Automatic Penalties
The FPS must be submitted to HMRC on or before payday, not after. Missing this triggers automatic penalties with no discretion applied. Note the PAYE payment deadline: 19th of the following month by post, or 22nd by bank transfer. Add both dates to your calendar before each payroll run.
7. Check VAT Records and Prepare for MTD Quarterly Updates
Your Monthly VAT Review
Review all VAT-coded transactions and confirm the correct rates were applied. Check your running VAT liability and set aside a corresponding cash reserve to cover the quarterly bill. Monthly checks mean your VAT return becomes a short review rather than a last-minute data-entry exercise.
MTD for Income Tax from April 2026
Mark your quarter-end months in advance so no deadline slips. For businesses approaching that threshold, a consistent monthly accounting workflow is a compliance requirement, not a choice.
Final Thoughts
The first time you follow this workflow, it may take longer than expected. By month three, it becomes routine. By month six, it becomes part of how your business naturally runs.
The real shift happens when you stop treating bookkeeping as a month-end problem and start managing it as a weekly discipline. That is what shortens your close, improves your cash flow visibility, and removes the pressure around tax deadlines.
Most bookkeeping problems do not begin with complicated accounting rules. They begin with missing receipts, delayed uploads, and small tasks left for later. That is why the first step matters more than most people realise.
Frequently Asked Questions
How long should monthly bookkeeping take for a small business?
For a small business that captures receipts and codes transactions throughout the month, the monthly close should take 30 to 45 minutes. Leaving documents to accumulate until month-end can extend this to two hours or more. The seven checks in this guide are designed to be run in sequence and take less time as the habit builds.
What records must I keep for HMRC and for how long?
HMRC requires self-employed individuals to keep invoices, receipts, and bank statements for at least five years after the 31 January submission deadline for the relevant tax year. For limited companies, records must be kept for six years from the end of the accounting period. Digital copies are accepted as valid evidence.
What is the difference between cash basis and accrual accounting?
Under cash basis (the default for sole traders from April 2024), income is recorded when money is received and expenses when paid. Under accrual accounting (mandatory for limited companies), income and expenses are recorded when earned or incurred, regardless of when cash moves. See Step 2 for the full comparison table.
Do I need to complete all seven steps every month?
Steps 1 to 5 and Step 7 apply to all small businesses every month. Step 6 — payroll and PAYE — applies only if you have employees. All other checks should be completed each month without exception.
What happens if I miss an FPS payroll submission deadline?
Missing an FPS deadline triggers automatic HMRC penalties with no discretion applied. The FPS must reach HMRC on or before each payday. The PAYE payment itself is due by the 19th of the following month by cheque or the 22nd by bank transfer. Add both dates to your calendar at the start of each payroll run.
When do MTD for Income Tax quarterly updates apply to me?
MTD for Income Tax applies from April 2026 if your qualifying income — from self-employment or property — is above £50,000. The threshold drops to £30,000 from April 2027. Affected businesses must submit quarterly updates via MTD-compatible software. A consistent monthly bookkeeping habit is what keeps those submissions straightforward.
