If you run several income streams—client work, marketplace sales, maybe a bit of passive income from affiliate links—you know how quickly records can get messy. As an accountant and someone who’s spent years helping micro‑businesses and freelancers, I’ve seen the difference a compact, well‑organised self‑assessment pack makes: faster tax returns, fewer queries from HMRC, and a calmer year‑end for you and your accountant. Below I’ll walk you through a practical, accountant‑ready pack you can assemble in a few focused hours and keep updated throughout the year.

Why a compact pack matters

When you hand over a neat, concise pack your accountant can immediately find totals, spot anomalies and file your return with confidence. That saves you money (less prep time) and reduces the chance of errors or missed reliefs. For multi‑income freelancers it’s essential because each income stream may have different tax treatment, VAT implications or allowable costs.

What I include in my “must‑have” pack

My aim is to keep the pack lean but comprehensive. Think: everything needed to complete a self‑assessment and answer likely queries, but nothing superfluous. Here’s the core list I use and recommend to clients:

  • Income summary for each income stream (sales, services, marketplaces, royalties, dividends).
  • Expense summary grouped by category (office, travel, software, subcontractors).
  • Supporting documents for large or unusual items (invoices, contracts, bank statements).
  • Payroll and CIS information, if applicable.
  • VAT returns and evidence of payments, if registered.
  • Bank and payment provider reconciliation summary (bank, PayPal, Stripe).
  • Capital expenditure list for assets claimed (with purchase dates and receipts).
  • Pension contributions, gift aid, charitable giving proof.
  • Previous year’s tax computation and SA302, if available.

How to structure the pack (folder layout)

I recommend a simple folder structure—either digital in cloud storage (Google Drive, Dropbox) or a physical folder. Keep the same layout every year so both you and your accountant know where to look.

  • 01_Income — CSVs or PDFs showing invoices and marketplace statements.
  • 02_Expenses — grouped PDF statements or photos of receipts by month and category.
  • 03_Bank_Recs — reconciled bank statement snapshots and a reconciliation worksheet.
  • 04_VAT — returns and payment confirmations.
  • 05_Assets — capital expenditure and invoices for items over the £200/£500 threshold you track.
  • 06_Personal — pension, charitable donations, previous SA302.

Preparing each section — step by step

Here’s how I prepare each component so it’s quick and repeatable.

Income

For every income stream create a one‑page summary showing:

  • Total gross income for the year.
  • Number of invoices/transactions and date range.
  • Notes on irregular items (refunds, chargebacks, one‑off sales).

If you use platforms like Etsy, Amazon, or Upwork, export their yearly statements and include a single spreadsheet that maps platform payouts to your bank entries. For client invoices, a single CSV from your accounting software (Xero, QuickBooks, FreeAgent) is perfect.

Expenses

Group expenses into standard HMRC categories: office costs, travel, premises, marketing, staff/subcontractors, professional fees, software/subscriptions. For each category provide:

  • Total amount.
  • Highlight any unusual or large items (>£500) with supporting invoices.
  • Attach digital copies of receipts in the folder or link to the accounting record.

Use an expense export from your accounting package. If you keep receipts in apps like Receipt Bank (Dext) or Hubdoc, include a single export or a reconciled folder of images.

Bank reconciliations and payment services

Bank statements are where accountants spend most of their time. Give them a one‑sheet reconciliation that shows how the year’s bank balance ties to your accounting system at year‑end. If you have PayPal and Stripe, include a mapping sheet showing how platform gross receipts convert to bank deposits after fees and refunds.

Assets and capital allowances

List each asset with purchase date, cost, and whether you’re claiming Annual Investment Allowance or writing down allowances. Attach invoices. For cars, include business mileage logs or the simplified mileage method calculation used.

VAT & Payroll

If VAT registered include your VAT account report showing reclaimed VAT and payments. For any PAYE or CIS schemes, include payroll summaries and employer payment summaries.

Making it accountant‑friendly

Little things make a big difference.

  • Use a single spreadsheet for summaries. A year‑end summary sheet with tabs for income, expenses, bank rec and assets is gold.
  • Label files clearly. Use YYYY‑Category‑Description (e.g. 2025‑Expenses‑Adobe‑Subscription.pdf).
  • Highlight anomalies. Add a short note for anything that needs explanation (large refund, one‑off sale, late client payment).
  • Provide access details. If your accounts live in Xero/QuickBooks, invite your accountant with user access rather than exporting everything manually. I regularly work from client Xero files—invites save time.

Quick templates I use

Document What to include
Income summary Gross totals by stream, sample invoices, platform statements
Expense summary Totals by category, receipts for >£500 items, subscription list
Bank reconciliation Final bank balance, statement pages, reconciliation worksheet
Asset register Item, cost, purchase date, allowance treatment
VAT & payroll VAT returns, PAYE summaries, CIS returns

Tools that make this easy

I often recommend tools that automate much of the grunt work:

  • Xero — great for bank feeds and invoicing; easy to invite accountants.
  • QuickBooks Online — good integrations with payment apps and receipts capture.
  • FreeAgent — popular with UK freelancers, simple self‑assessment helpers.
  • Dext/Receipt Bank, Hubdoc — receipt capture and supplier statement matching.
  • Google Sheets — for a simple custom year‑end summary that you and your accountant can edit.

How often to update

Don’t wait until January. Update your pack monthly or quarterly. A 30‑minute tidy each month prevents the last‑minute scramble and gives your accountant time to spot issues early—missing CIS deductions, VAT errors, or remittance mismatches.

What I ask from clients sending a pack

When a client sends me their pack I ask for three things up front:

  • A single link to the folder or the main spreadsheet.
  • A short cover note listing any unusual transactions or tax questions.
  • Verification that bank feeds and reconciliations are complete to the year‑end.

That short cover note often saves an extra email or two and lets me get straight into the computation.

If you’d like, I can share a downloadable year‑end spreadsheet template I use with clients — it includes tabs for income streams, expenses categories and a bank reconciliation sheet. Send me a message and I’ll email it across.