Marcus Okafor's van leaves Morgan Close at 6:40 every morning, and for most of 2026 it came back to the best year he's ever had. September alone: £6,100 invoiced — a record he mentioned, casually, roughly forty times. Self-employment is freedom, Marcus will tell you, and last year freedom paid.
It also, this being the part freedom is quieter about, ran his invoices through no payroll, deducted no tax, and asked no questions. Every pound landed whole in the joint account, looking spendable. Some months £6,100 landed. One month, June, £950 did. It evens out, Marcus says. It'll even out.
On the 28th of December — Jade having asked, with baby Amara on her hip and a particular tone, whether he'd "done the return yet" — Marcus finally sits down with the laptop and files his self-assessment. The calculation takes HMRC's website four seconds.
£5,200. Due 31 January. Income tax, Class 4 National Insurance, and — the line nobody warns first-timers about — a payment on account: an advance on next year's bill, because HMRC has decided it would rather not wait either.
The joint account holds £2,340. Jade's maternity pay covers roughly a fortnight of the mortgage. The van needs two tyres before its MOT. And it is thirty-four days until the deadline, which Marcus reads three times, as though the number might even out too.
Try it yourself before you choose
The Lumpy Income Smoother
These are Marcus's last twelve months of invoices — £34,950 in total, arriving like weather. Drag the slider to skim a slice off every invoice into a separate pot the moment it lands, and watch two things: whether January is covered, and what happens to his worst month.
FMAMJJASONDJ
Kept as paySkimmed to the pot
The pot after 12 months
£0
The £5,200 bill: completely uncovered
Worst month's take-home
£950
Average kept per month: £2,913
Illustrative figures for one fictional sole trader — real tax bills depend on profits, expenses and circumstances. The habit, though, transfers: skim on arrival, not in January.
Decision point
Thirty-four days. £5,200 owed. £2,340 in the account. What should Marcus do?
If you chose: Deal with it on the 31st
Cash in hand now
Debt risk
Peace of mind
Hope is not a payment method HMRC accepts
Here's what "dealing with it later" costs with this particular creditor. From 1 February, late-payment interest starts running daily — HMRC's rate tracks a few points above the Bank of England base rate, so it's real money. At thirty days late, a 5% penalty lands on whatever's still owed — £260 on a full £5,200 — with further 5% charges at six and twelve months. And unlike almost any other bill, ignoring HMRC escalates: this is the one creditor with genuinely long arms.
The cruellest part: the do-nothing option feels free in January and is the most expensive path on this page. Every other choice below beats it. If a bill can't be paid, the worst response is silence — which is precisely why the next two options exist.
If you chose: Borrow it commercially
Cash in hand now
Debt risk
Peace of mind
Certainty, at a price
A personal loan clears HMRC in full and on time — no penalties, no letters, one tidy monthly repayment. For someone who knows they won't stick to an arrangement, buying certainty has honest value. (Small print of the era: HMRC stopped accepting personal credit cards back in 2018, so the card version means borrowing the cash first — and card rates make that the dearest respectable route here.)
But notice what this choice really does: it swaps a creditor who offers structured instalments at moderate interest for a commercial lender at loan rates, plus a credit application, plus a fixed commitment against an income that arrives like weather. It solves January and does nothing about next January — the leak that caused the bill is still running. Borrowing can be a bridge; it can't be the plumbing.
If you chose: Ring HMRC before the deadline — Time to Pay
Cash in hand now
Debt risk
Peace of mind
The option almost nobody knows exists
HMRC runs an instalment scheme called Time to Pay — and for self-assessment bills under £30,000, with the return filed, it can often be set up online in minutes, no phone queue, no negotiation, spreading the bill over up to twelve months. Interest applies, but crucially: arrange it before things go late and the 5% penalties never land. It converts a cliff into a slope.
The trade-offs are honest ones: interest still accrues, the instalments must actually be met, and — the subtle trap — next year's bill will arrive while this year's is still being paid off, so the arrangement buys time to fix the system, not permission to keep it broken. Used with a new skim-on-arrival habit, it's the fluent move. Used alone, it's next January with extra steps.
If you chose: Scrape every account to zero and pay in full
Cash in hand now
Debt risk
Peace of mind
Paid — and one bad week from the card
Debt-free has a clean sound to it, and there's real relief in a settled bill. But look at the state it leaves number 9 in: every account at zero, a baby in the house, a van that needs tyres this month, and an income whose next arrival date is a guess. A household with no buffer doesn't avoid borrowing — it merely postpones it until the first surprise, at whatever rate the emergency accepts.
And there's a line inside this choice that matters more than the maths: the £400 in Jade's Instagram pot is hers — earned at 11pm feeds, and the seed of something she's planning. Taking it without asking wouldn't just empty an account; on a street where we've seen family money come with invisible fees, it would spend something harder to rebuild. If it's offered, it's a gift of real weight. Raided, it's a debt with no repayment schedule.
Curious? You can tap the other choices to explore every path — each one teaches something different.
What Marcus and Jade actually did
Marcus sat on the number for two days — carried it around on jobs, said nothing, quoted a rewire badly. It was Jade who put Amara down on the Thursday night, made two teas, and set a notebook on the table that Marcus had never seen. Columns. Dates. Every invoice of his for eight months, and next to them, a running guess at the tax — her guess, pretty close to HMRC's, made at 11pm feeds while her own little Instagram money grew in its own separate pot. "I wasn't going behind your back," she said. "I was waiting for you to want to look."
They did it her way. £2,600 scraped together from the joint account and December's last invoice — including £400 Jade slid across the table before he could ask, on the stated condition that it came back first. The remaining £2,600 went onto a Time to Pay arrangement, set up online in eleven minutes on the 29th of December — six instalments, interest and all, penalties never in the picture.
Then the plumbing. A second business account, opened the same night, into which 20% of every invoice now moves the day it lands — Marcus ran the smoother himself and saw that 15p in every pound would have had this January covered before it knocked; twenty gives margin. Jade named the account, and it appears on their banking app, permanently, as NOT OURS. Marcus also put his day rate up — the rewire he underquoted stung at exactly the teachable moment.
Where it leaves them: instalments until June, the pot filling itself invoice by invoice, Jade's £400 repaid first as promised — and her notebook now living on the table instead of in the drawer, which was the real balance transferred that night. Amara turned one the week the deadline passed, unbothered, covered in cake.