It's the last Friday of the month. Shopify says you did £410,000. TikTok Shop says £280,000. Amazon says £190,000. Your bank says something else entirely, and the bookkeeper you hired in January has gone quiet.

I spend my days inside the month-ends of UK DTC brands doing £1m to £20m across TikTok Shop, Amazon and Shopify. And I can tell you exactly when a scaling brand starts leaking money. It's rarely when sales dip. It's when nobody closes the month properly, so nobody actually knows what happened.

E commerce bookkeeping at scale is boring, repetitive and the only thing standing between you and a £40,000 VAT bill you didn't see coming. This is the checklist we run our clients through. Twelve steps, once a month, in order. Print it. Pin it. Do it.

Why Month-End Is Where Scale-Ups Come Apart

At £500,000, you can run your books on a spreadsheet and a prayer. At £1m and above, that stops working. Three platforms, three payout cycles, three sets of fees and refunds, stock moving in and out, VAT, payroll, FX. The numbers multiply faster than your headcount.

The killer is never one big mistake. It's twelve small ones that compound. A settlement report nobody checked. A refund batch coded to the wrong account. A prepayment forgotten. Each tiny on its own, together the difference between a 12% net margin and a 4% one. Same sales, same products, same customers. Different books.

So here's the fix. One day a month, close the books properly. Every month, without exception. Here are the twelve steps, in the order we run them.

The 12-Step Monthly Accounting Checklist

1. Reconcile every bank account. The business current account, PayPal, Stripe, the Amazon payout account, all of them. Match every transaction to a receipt or invoice, and chase anything that won't match. Plain English: if it isn't on a bank statement, it isn't real. If it is on a bank statement and you can't explain it, that's a leak. Find it now, not in March.

2. Reconcile every sales channel against its settlement report. This is the step that separates e commerce accountants from everyone else. The TikTok Shop settlement report is the truth for TikTok. The Amazon settlement report is the truth for Amazon. Shopify's reports are the truth for Shopify. Match each against the money that actually landed in your bank. Fees, refunds, chargebacks, adjustments, reserves. Every line, every month. Brands that skip this step don't lose money in one go. They lose a few thousand pounds a month, forever.

3. Count stock and value it honestly. Do a stocktake, or cycle counts on your fastest lines, and value stock at the lower of cost and net realisable value. That rule has been with us since the 1925 case of Whimster v CIR. Plain English: if you paid £10 a unit and can now only sell it for £7, but it costs £1 to complete and sell, your books show £6, not £7. HMRC will not let you carry dead stock at cost. Supplier deposits stay prepayments until control and risk in the goods pass to you under the contract, not from the moment money leaves your account. We dig into the whole problem in our stock versus cash post.

4. Get the VAT position right before the return. Every VAT-registered business has to keep digital records and file through Making Tax Digital compatible software, that's been the law since April 2022. And the soft landing on digital links is over: no more copy and pasting figures from a spreadsheet into your VAT software, the data has to flow between programs digitally. Reconcile your output tax against the sales reports, know which sales the marketplace collects VAT on and which you account for yourself, then file before the deadline. If any of that sentence made you wince, start with our TikTok Shop VAT checklist.

5. Run payroll properly and pay HMRC on time. RTI submitted, wages paid, pensions enrolled. Employer National Insurance is 15% above a £96 a week threshold in 2026-27, so a £40,000 payroll costs you more than £40,000. PAYE is due by the 22nd of the month. Miss it and the penalties become the most expensive loan you'll ever take.

6. Code every expense, especially the cards. The company card, the personal card used for business, the Amazon and TikTok ad accounts. Everything gets coded to the right account in the right month. The personal and business split needs to be ruthless. HMRC will ask, and your accountant will charge by the hour to unpick a mixed-up card.

7. Run your aged debtors and creditors. Who owes you money, and how long have they owed it? Wholesale accounts are where brands at your size carry £50,000 of invisible working capital. And who do you owe, and when is it due? Pay your suppliers on the last day you're allowed, not the first.

8. Do your prepayments and accruals. Annual insurance, annual software, the agency retainer, goods in transit. Match the cost to the month it belongs to, not the month you paid it. This is what makes your monthly profit honest, and it's the first step dropped when the bookkeeper is stretched.

9. Revalue your foreign currency. If you sell on Amazon.com or TikTok Shop US, you've got dollars sitting in payout accounts. Your books need a proper exchange rate every month, with the gain or loss recognised. Ignore it and your P&L lies to you in a currency you can't see. We cover the mechanics on our multi currency accounting page.

10. Look at the four numbers that matter. Gross margin by channel, contribution after fees and ads, cash runway, and stock days. Not the vanity dashboard, the four that decide whether you survive. If your gross margin is 60% but commission, ads and fulfilment eat 45 points, you're running a charity with a Shopify store. The 13 week view in our cashflow forecasting post is where that starts.

11. Set aside the tax before it's due. Corporation tax is 19% on profits up to £50,000 and 25% above £250,000, with marginal relief in between. It's due nine months and one day after your year end, or in quarterly instalments when profits are big enough. VAT quarterly, PAYE monthly (small PAYE schemes can pay quarterly). Work out the monthly provision and move it into a separate account. Brands that skip this step have a February conversation about an April bill they can't pay. And watch this: Making Tax Digital for Income Tax starts 6 April 2026 for sole traders and landlords with combined qualifying income over £50,000, then the bar drops to £30,000 in April 2027 and £20,000 in April 2028. If you have self-employed or property income outside the company above the qualifying threshold, that's you. For the company itself, MTD for Corporation Tax still has no start date, so anyone telling you it's already here is selling something.

12. Review the month with someone who's seen a scale-up before. A good e commerce accountant doesn't just file the return. They look at the numbers and ask why. Why is TikTok margin down two points? Why is stock up 40% when sales are up 12%? Why did the ad account double but revenue not move? That review is where the checklist turns from compliance into money.

What a Clean Month-End Buys You

Do all twelve steps and here's what changes. You know your real margin, so you know what you can afford on growth. You know your cash runway, so you can say yes to the stock order or the hire with your eyes open. You know your tax position, so there are no surprises. And your accountant's bill drops: they're not unpicking a mess.

We have clients who have gone from zero to £1m turnover in six months. The ones still standing at £5m all have the same habit: the month gets closed, every month. Not because it's fun. Because it's the difference between steering and guessing.

Frequently Asked Questions

Do I need both a bookkeeper and an accountant?

At £1m plus, you need the function, not necessarily two firms. A bookkeeper codes the transactions. An accountant decides what they mean, plans the tax and reviews the month. A specialist firm does both in one place, and the review in step 12 is the bit that actually pays for itself.

Which software should I use?

Xero, with the marketplace integrations wired in properly. QuickBooks works, but for multi channel e commerce we find Xero's ecosystem stronger, and the bank feeds and apps matter more than the logo. Whatever you pick, the software is only as good as the person closing the month.

How long should month-end take?

With clean bank feeds and disciplined coding, two days. With a spreadsheet and a prayer, two weeks, and the numbers will still be wrong. If your month-end takes more than a week, the problem isn't effort. It's the system.

My books are four months behind. Where do I start?

With the bank and the settlement reports, oldest month first, and don't try to fix everything in one weekend. A catch-up project takes a few weeks. What's not doable is pretending it isn't happening, because HMRC doesn't care that you were busy.

I'm a Ltd company. Do I need to worry about Making Tax Digital?

Yes, but not the way the headlines say. MTD for VAT already applies to you, and the digital links rules are strict now. MTD for Income Tax is for sole traders and landlords, so it only touches you if you have income outside the company. And MTD for Corporation Tax has no confirmed start date. The direction of travel is clear: get the books digital end to end now, and whatever HMRC does next won't hurt.

Summary: The Month You Close Is the Month You Control

Twelve steps. One day a month. That's the whole system. Reconcile the cash, reconcile the channels, count the stock, sort the VAT, pay the payroll, code the expenses, chase the debtors, match the costs, revalue the currency, read the four numbers, provision the tax, and review it with someone who knows what they're looking at.

Skip the checklist and you don't save time. You save a day a month and spend the rest of the year guessing. Turnover is vanity, profit is sanity, cash is reality. All three are decided in the month-end.

If you're doing £1m+ across TikTok Shop, Amazon or Shopify and you want a month-end that actually tells you where the money went, book a call. We'll run the checklist against your current books and show you what's leaking. Start with our free tools and the TikTok Shop VAT checklist. If TikTok Shop is your main channel, see how we help TikTok Shop sellers. Real examples are on our case studies page.