How to Prepare for Tax Season: A Small Business Checklist

Why Preparation Makes the Difference

The businesses that find tax season straightforward are not the ones with the simplest finances - they're the ones that have been doing their bookkeeping consistently throughout the year. When your records are current and accurate, preparing a tax return is mostly a matter of running the right reports. When your records are incomplete or inaccurate, tax season becomes a stressful, time-consuming reconstruction project. This checklist helps you make sure you're in the first camp, whether you're filing yourself or handing your records to an accountant.

Step 1: Close Off Your Bookkeeping

Before you can file a tax return, your accounts for the tax year need to be complete and accurate. This means: all bank transactions are imported and categorised; all income is recorded and matched to invoices; all expenses are recorded with receipts; bank accounts are reconciled against statements; any outstanding invoices are correctly accounted for; and any accruals or prepayments that span the year end are recorded correctly. If you've been doing your bookkeeping monthly throughout the year, this should take a few hours. If you've been deferring it, this is the stage where catching up is unavoidable.

Step 2: Gather Your Income Records

Compile a complete picture of all your business income for the year: all invoices raised, all payments received, any income from sources other than invoicing (interest, grants, sales of assets, etc.). Reconcile your recorded income against your bank deposits - every pound that came into your business accounts should be explained in your income records. Unexplained receipts are either income that wasn't recorded or non-income receipts (like a loan repayment from an employee) that need to be categorised correctly.

Step 3: Review and Finalise Your Expense Records

Run through your expense records and check for completeness and accuracy. Look for missing receipts, miscategorised expenses, and any personal costs that may have been recorded as business expenses incorrectly. Check that all deductible categories are included - travel, mileage, home office costs, professional fees, software, training. See our detailed guide on year-end expense review for a complete checklist.

• Confirm mileage log is complete and contemporaneous
• Check home office claim is correctly calculated
• Verify all professional subscriptions are recorded
• Confirm bank charges and interest are included
• Check that capital expenditure is coded as an asset, not an operating expense

Step 4: Prepare Your VAT Records (If VAT-Registered)

If you're VAT-registered, your VAT returns should already be filed quarterly or monthly. Before finalising your year-end accounts, confirm that your VAT records reconcile with your sales and purchase records. Any discrepancies between your VAT returns and your underlying accounts will need to be explained. Check that you haven't overclaimed input VAT on non-deductible expenses (business entertainment, personal items) and that you've correctly treated any exempt or partially exempt supplies.

Step 5: Deal With Outstanding Issues

Before finalising your return, address any known issues: invoices that have been outstanding for more than 12 months and are unlikely to be paid (you may be able to claim bad debt relief); assets that were sold or scrapped during the year (capital gains or loss calculations required); changes in business structure, ownership, or registered address that affect your filing. Flag anything unusual for your accountant early - last-minute discoveries create delays.

Step 6: File on Time

Know your filing deadlines. In the UK, sole traders file self-assessment returns by 31 January following the tax year end. Companies file corporation tax returns within 12 months of their accounting year end. Late filing attracts automatic penalties that increase over time. If your records are in order, there is no reason to file at the last minute. Filing early means earlier certainty about your tax bill and earlier access to any refunds.

Related reading: self-employed tax: what you need to know and quarterly estimated tax payments explained.

How Note.now Makes This Easy

Note.now keeps your books current throughout the year so that tax season is a reporting exercise rather than a catch-up exercise. Year-end reports export in formats ready for your accountant or tax software. See also our guide on managing sales tax in Note.now. Explore Note.now's accounting features, or start free today.