How to do accounting as a freelancer is one of those questions that sounds complicated but usually has a pretty straightforward answer. You don’t need to become an expert in tax law, and you don’t need a full finance team. You just need to know what actually matters and what you can safely ignore for now.

What records do you actually need to keep as a freelancer?

The basic rule is simple: keep a record of everything you earn and everything you spend that relates to your work. That means invoices you’ve sent, bank statements, receipts for business expenses, and any income from clients, platforms, or contracts. You don’t need a fancy system to start with. A spreadsheet or a basic cloud accounting app will do the job.

The expenses side is where most freelancers leave money on the table. If you work from home, use a phone for business, subscribe to software, or travel to client meetings, those costs can reduce your taxable income. You don’t need a receipt for every single thing, but you do need something that shows what you spent and why it was for work. I see a lot of freelancers either overclaiming or underclaiming expenses, and both cause problems.

The tax deadlines every UK freelancer needs to know

As a sole trader in the UK, your main obligation is Self Assessment. You register with HMRC, file a tax return each year covering the period from 6 April to 5 April, and pay whatever tax is owed. The filing deadline is 31 January online, and the payment deadline is the same date. Miss it, and HMRC’s penalties start at £100 even if you don’t actually owe any tax.

There’s also something called payments on account to be aware of. If your tax bill is over £1,000, HMRC will ask you to pay half of next year’s estimated bill upfront in January, and the other half in July. It catches a lot of freelancers off guard in their first or second year. It doesn’t mean you owe more overall, it just means the timing shifts forward.

Making Tax Digital is coming for freelancers. Here’s what it means.

From 6 April 2026, Making Tax Digital for Income Tax applies to sole traders earning over £50,000 a year from self-employment or property. From April 2027, the threshold drops to £30,000, and from April 2028 it drops again to £20,000. If you’re above those figures, you’ll need to use compatible software, keep digital records, and send quarterly updates to HMRC instead of just filing once a year.

The good news is that MTD doesn’t change the actual tax rules. Your allowances, expenses and National Insurance obligations all stay the same. It’s really about the way you record and report things, not the amount you pay. If you’re already using something like QuickBooks, FreeAgent or Xero, the shift is fairly manageable. If you’re still doing everything manually, now is a sensible time to sort that out.

Do you actually need an accountant as a freelancer?

Not every freelancer does. If your income is straightforward, your expenses are simple, and you’re comfortable with numbers, you might manage fine on your own. But most freelancers I speak to either underestimate what they can claim, miss deadlines because life gets busy, or spend hours on tax admin when that time would be better spent on client work. An accountant takes that off your plate and usually saves you more than they cost.

What I’d say is this: even if you only speak to an accountant once a year around Self Assessment time, it’s worth it for the peace of mind alone. Knowing someone has checked your figures, claimed the right expenses, and filed everything correctly means you’re not lying awake wondering if HMRC is about to send you a letter. If you want a feel for what that looks like in practice, you can read through my full freelancer accounting guide, which goes into a lot more detail.