You wake up, check the bank app, and the number is smaller than it was on Monday. Not because sales dipped. Sales are up. You're doing £40k a week and the balance is going backwards. The panic sets in.
I see this exact scene weekly. A founder doing £1m to £5m, growing fast, profitable on paper, and one Friday the card gets declined at the supplier checkout. It's not a sales problem. It's a cashflow problem, and hypergrowth is the fastest way to create one.
Turnover is vanity, profit is sanity, cash is reality. As a specialist social commerce accountant, I spend my days inside the settlement reports and bank feeds of UK brands scaling from £1m to £20m. This is the founder's guide to cashflow forecasting I wish someone had handed me before I watched clients learn the hard way. We have clients who have gone from zero to £1m turnover in six months. Cash is why some of them made it.
The Reality Check: Why Growth Eats Cash
Here's the uncomfortable truth about scaling a DTC brand: you pay for everything before the platforms pay you. Stock, ads, warehouse, payroll. All out. Platform payouts arrive on the platform's schedule, not yours.
Amazon settles every 14 days. Shopify pays out within a couple of business days. TikTok Shop pays after the order is completed and the return window has passed, and it holds a reserve when you're new. Klarna and PayPal hold their own. None of them pay you at the till.
So a £40k week of sales is not £40k in the bank this week. It's £30k over the next fortnight, if your mix is right. Meanwhile the stock order that fuelled that growth landed six weeks ago, and the ad bill is due every week. Growth doesn't create cashflow problems. Growth just makes them arrive faster.
A £2m Brand, 13 Weeks, One Table
Let's make this real. A brand doing £2m a year, roughly £40k a week. Platform payouts lag sales by about two weeks. Ads at £9k a week, payroll and overheads at £7k. A £90k stock buy lands in week three. The VAT quarter ends in week eight, so the bill lands around week twelve. Opening balance: £12k.
Here's the 13-week cashflow forecast. The numbers are rounded, but the shape is real. I see it constantly:
| Week | Money in | Money out | Weekly net | Running balance |
|---|---|---|---|---|
| 1 | £30,000 | £16,000 | +£14,000 | £26,000 |
| 2 | £30,000 | £16,000 | +£14,000 | £40,000 |
| 3 | £40,000 | £106,000 | -£66,000 | -£26,000 |
| 4 | £40,000 | £16,000 | +£24,000 | -£2,000 |
| 5 | £40,000 | £16,000 | +£24,000 | £22,000 |
| 6 | £40,000 | £16,000 | +£24,000 | £46,000 |
| 7 | £40,000 | £16,000 | +£24,000 | £70,000 |
| 8 | £40,000 | £16,000 | +£24,000 | £94,000 |
| 9 | £40,000 | £16,000 | +£24,000 | £118,000 |
| 10 | £40,000 | £16,000 | +£24,000 | £142,000 |
| 11 | £40,000 | £16,000 | +£24,000 | £166,000 |
| 12 | £40,000 | £68,000 | -£28,000 | £138,000 |
| 13 | £40,000 | £16,000 | +£24,000 | £162,000 |
Week three. That's where it breaks. The stock buy lands before the payouts catch up, and the balance goes to minus £26k. Nobody planned it. The business is profitable on paper. That's the point. Profit is a story your accounts tell once a year. Cash is a story your bank tells every Friday.
Now watch what happens when the founder actually uses the forecast. The factory agrees 60 day terms, so the £90k moves from week three to week nine. The VAT money gets put in a separate pot every week, so week twelve stops being a cliff. A £50k credit line sits there as a buffer, untouched, ugly, and reassuring. Same sales, same margins, same growth. The dip never happens.
The forecast didn't predict the future. It moved it. That's the whole game.
Know When the Platforms Actually Pay You
The single biggest forecasting mistake I see: forecasting sales instead of settlements. Your forecast has to live in the week the money lands, not the week the order is placed.
Build it by channel, because the channels don't behave alike. Amazon's 14 day settlement cycle. TikTok Shop's completion based timing, with a reserve held back when you're new. Shopify's speed. Your blended lag is what matters, and it changes as your channel mix changes. The brand that goes from 80% Shopify to 60% TikTok Shop has changed its cashflow, even if total sales stay flat.
Quick summary: what this means for you. One row per channel in your forecast. If payouts land ten days after sales, the first two weeks of your forecast are already spoken for.
The Tax Calendar Is a Cashflow Calendar
Tax doesn't care about your growth. It cares about dates.
VAT first, because it's the biggest one. On £2m of standard-rated sales, roughly £330k of VAT flows through your bank account every year. It is not your money. It's due one month and seven days after the end of your quarter. If you're under £1.35m of taxable turnover, the VAT cash accounting scheme lets you pay VAT only when customers actually pay you. It's a genuine lifesaver at the £1m mark. Past £1.35m it's gone, so the discipline has to be in place before you cross. Our VAT registration checker and the TikTok Shop VAT checklist cover the traps at the smaller end.
Corporation tax: normally due nine months and a day after year end. Once your profits pass £1.5m, HMRC wants it in four quarterly instalments, two of them before the year even ends. That's not a tax problem. That's a cashflow event wearing a tax costume. We walk through every threshold in From £1M to £20M: What Actually Changes in Your Accounting.
Sole traders and partnerships with income over £50,000: Making Tax Digital for Income Tax means quarterly updates to HMRC from April 2026. The tax year is becoming a quarterly cash conversation. Get used to it.
Here's the number that should scare you. HMRC charges 7.75% interest on late tax right now, that's Bank Rate at 3.75% plus 4%. When HMRC owes you money, it pays 2.75%. It's the only lender in your life that charges you almost three times what it pays you. Don't volunteer to be the borrower. The brands that sail through tax season put the VAT aside weekly, the corporation tax aside monthly, and treat HMRC like the landlord it is.
How to Build a 13-Week Forecast That Survives Contact With Reality
Forget the 12 month model. At your growth rate it's fiction. 13 weeks is the horizon where cash actually lives. Anything further out is a strategy document, and pretending otherwise is how you get a week three you didn't see coming.
The mechanics, in plain English:
One row per week, thirteen weeks. Money in: payouts by channel, on the week they land. Money out: stock buys on their actual payment terms, ads weekly, payroll, rent, and a tax calendar line. Add 20% contingency: 20% less in, 20% more out. If the forecast still works, you're fine. Update it every Friday, fifteen minutes. A forecast you don't update is a horoscope.
Run it in Xero's cash flow feature or a spreadsheet you maintain. The tool doesn't matter. The weekly habit does. What matters more: your books have to be clean enough to forecast from. If the numbers underneath are guesswork, the forecast is polished guesswork. The systems in Scaling from £1M to £5M: The Finance Systems That Keep Up are the foundation underneath it.
My Contrarian Take: Your Accountant Should Have Shown You This
Here's the part that annoys me. Every brand in this situation has an accountant. Most see that accountant once a year, at filing time, and get a number and a bill.
An accountant who meets you at year end is a tax return service, not an accountant. The ones who earn their fee run the cashflow with you, flag the week three dip before it happens, and tell you the £90k buy needs payment terms before you sign it. Crossing £1m doesn't just change your tax. It changes the standard of finance you can get away with, as we covered in The £1M Revenue Trap.
If your accountant can't tell you your cash position for the next 13 weeks, you don't have a finance partner. You have a filing deadline.
Frequently Asked Questions
How much cash should a scaling DTC brand hold?
Enough to cover 13 weeks of costs, with tax provisions in a separate pot. On £2m of sales that's usually £150k to £250k depending on your cost base. Below that, every decision is made with a gun to your head.
Why is my profit up but my bank balance down?
Because profit is an opinion and cash is a fact. Stock, platform payment lags, VAT timing and supplier terms all move cash away from the month the sale happens. The forecast shows you exactly where.
Can I use the VAT cash accounting scheme?
If your taxable turnover is £1.35m or less, yes, and you should. You pay VAT only when customers pay you. It's the best cashflow tool under that line. Past it, it's gone, so build the discipline before you cross.
When do I start paying corporation tax in instalments?
When annual profits pass £1.5m: four quarterly instalments, two before your year end. Plan from £1.2m of profit, not £1.5m. The first instalment lands before the year ends and it will not wait for you.
Is a credit line the answer?
A credit line is a buffer, not a strategy. If you're borrowing for working capital every quarter, the forecast is telling you something. Listen to it.
Summary: Cash Is the Only Number That Can't Lie
Your P&L can flatter you. Your sales dashboard can distract you. Your bank balance can't lie, and neither can a 13-week forecast built from real settlement dates.
Hypergrowth doesn't have to mean living on the edge. It means knowing exactly which week the edge is, and moving it. The stock buy gets terms. The VAT goes in the pot. The credit line waits in the corner. Same sales, same margins, no panic.
Cashflow forecasting isn't the boring part of scaling. It's the part that decides whether you're still standing at £5m to tell the story.
If you're doing £1m+ across TikTok Shop, Amazon or Shopify and want the 13 week view of your own cash, book a call. We'll build the forecast in the first conversation, and we live in the settlement reports if TikTok Shop is your world: see how we help TikTok Shop sellers. Real examples are on our case studies page.