Right, here’s the thing. Last year, I nearly had a proper meltdown trying to sort my tax return. Imagine me sitting at my kitchen table one night at half past midnight, laptop battery dying, and a pile of receipts that looked like my toddler had been having a right go with the paper shredder. Mental, really. So, the question arises – how to file income tax return for small business.
But here’s what I have learned; and what I wish someone had told me three years ago when I first set up my tiny marketing consultancy.
You Might Not Even Need To File One
Bit of a revelation, this. Actually not all small business owners even need to complete a Self Assessment. Mad, isn’t it? All this stress for nothing.
You only need to file if you’re self-employed, in a business partnership or making money that hasn’t already been taxed via PAYE. Corporate directors typically have to, too. My mate Andrew is a director of a limited company and still has to file because he takes dividends in addition to his salary.
Must register before 5th October if it’s your first go. Don’t be like our neighbour Lily, who waited until Christmas and was locked out of the system. Proper nightmare that was.
The Paperwork Bit (Unfortunately)
This is where it gets boring. Sorry about that. But you have to have your ducks in a row or you’ll end up like I did; combing through emails at 2am, trying to recall what that £73 payment to Amazon before you went off on holiday was for.
Income stuff first. Every invoice you’ve issued, every payment that’s come in, all your bank statements. I now save mine in a folder on Google Drive. Sounds dead organised, doesn’t it? It only took me two years of chaos to figure that out.
Then there are expenses. Office rent, phone bills, that computer you bought, petrol for visiting clients, even the cup of coffee when you sat down with that prospective customer. Keep the receipts. All of them. Even the rubbish ones from the corner shop that fade after two weeks.
Personal allowance for this tax year is £12,570. Anything you earn above that, you pay tax on. Simple as that.
Now, How to File Income Tax Return for Small Business
When you get your UTR number (which should take about 10 days), you can log into the HMRC website. But it’s really not as bad as it once was. When it used to crash every five minutes? Those days are mostly gone.
Begin with the easy stuff: your name, your address, that kind of thing. Then move down to the employment section if you had other jobs. The self-employment pages come next. That’s where you record all your business income and costs.
My accountant friend Mark always says be honest but don’t be stupid.’ If you bought something for the business, claim it. But don’t try claiming your weekly shop because you sometimes think about work while buying milk. HMRC aren’t daft.
Where People Stuff It Up
I did this myself in year one. I forgot the £800 a month I had earned renting my office space out to another freelancer. HMRC spotted it pretty sharpish. Ended up with a bill that left me eating beans on toast for a fortnight.
Keep your business and personal life separate. That dinner out with your mate may have led to a brief, work-related chat, but unless it was genuinely a business meeting, it doesn’t count. Common sense, really.
Capital allowances catch plenty of people out too. If you’ve spent money on equipment, vehicles, that sort of thing, you might be getting some of that tax back. The Annual Investment Allowance is still a pretty generous amount this year too, so it’s worth investigating if you’ve spent serious cash to kit.
Working Out What You Actually Owe
Here’s the bit everyone dreads. Your income tax return for your small business should reflect your true profit, not just how much money came through the door.
So if you invoiced £35,000 last year but spent £8,000 on legitimate business costs, your taxable profit is £27,000. Take away the personal allowance of £12,570, and you’re paying tax on £14,430.
Don’t forget National Insurance either. That applies once you make more than £242 a week from self-employment. And you must register for VAT as soon as your turnover reaches £90,000 in any 12-month period. That has caught many people by surprise.
Calculate everything twice. I use a basic spreadsheet; nothing fancy. Income at the top, expenses underneath, profit at the bottom. My 12-year-old could probably manage it.
Paying Up And Moving On
Once you submit, HMRC works out your bill. The deadline is 31st January 2026 for the 2024-25 tax year. Miss it and they’ll sting you for £100 straight away. More if you’re really late.
If your tax bill’s over £1,000, they’ll probably want payments on account for next year too. Basically, it means you pay half of this year’s bill as a deposit for next year. A bit cheeky, but there we are.
Set up a direct debit or make sure you’ve got the cash ready. Interest on late payments isn’t cheap, and you’ve got better things to spend money on than HMRC penalties.
What I Tell Everyone Now
Been through this process four times now, and it gets easier. Honest. That first year nearly finished me off, but now it’s just another job to tick off the list.
Start early. Keep proper records. Don’t try to be clever with your expenses. And if you’re stuck, ask for help. HMRC’s helpline isn’t actually staffed by robots trying to catch you out. Most of them are quite helpful once you get through.
My income tax return for a small business used to be this massive thing hanging over my head from about November onwards. Now I usually get it done by Christmas and spend New Year’s Eve in the pub instead of hunched over a laptop swearing at receipts.
You’ll get there. Everyone does eventually. And next year? You’ll be the one giving advice to some poor soul having their first go at it.
That’s the thing about running your own business. We’re all just making it up as we go along, really. But at least we’re doing it together.
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