Made a Loss Self-Employed? What It Can Mean for Your Tax Return

Quick Answer

If your allowable business expenses exceed your income, you've made a loss. You won't owe Income Tax on self-employed income that year, and you may be able to carry the loss forward to reduce profits (and tax) in future years. You might also be able to offset it against other income.

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What Counts as a Loss?

A loss occurs when your allowable expenses exceed your income for the tax year.

Loss = Expenses − Income

Example:

Income: £8,000
Expenses: £12,000
Loss: £4,000

This can happen in your first year (start-up costs), during a slow period, or if something went wrong.

Do I Still Need to File?

You're not required to file a Self Assessment just because you made a loss. But in most cases, you should.

Why?

You can carry the loss forward to reduce future profits
You may be able to offset it against other income
It keeps your records clean with HMRC

If you were already registered for Self Assessment, you'd file and report the loss. If you weren't registered, you might choose to register specifically to record it.

What Happens to a Loss?

You have options for what to do with a trading loss:

Option 1: Carry it forward

Apply the loss against future profits from the same trade.

Example:

Year 1: £4,000 loss
Year 2: £15,000 profit
Taxable profit in Year 2: £15,000 − £4,000 = £11,000

This reduces your tax bill in the year you become profitable.

Option 2: Offset against other income

If you have other taxable income (e.g., employment income, rental income), you may be able to offset your trading loss against that income in the same year.

This is more complex and has rules—check HMRC guidance or speak to an accountant.

Option 3: Carry back (limited)

In some cases, you can carry a loss back to an earlier year. This is less common and has specific conditions.

Worked Example: Carrying Forward

Year 1:

Self-employed income: £6,000
Expenses: £10,000
Loss: £4,000

Year 2:

Self-employed income: £25,000
Expenses: £7,000
Profit before loss relief: £18,000

Applying the loss:

Taxable profit: £18,000 − £4,000 = £14,000

You pay tax on £14,000 instead of £18,000—saving potentially £800+ in tax.

How to Report a Loss

When you complete your Self Assessment:

Calculate your income and expenses as normal
The result will be a negative figure (loss)
Enter this on your tax return
Indicate how you want to use the loss (carry forward, offset, etc.)

Keep clear records of the loss and any relief claimed.

Do I Pay National Insurance on a Loss?

No. If you made a loss, there's no profit to pay Class 4 NI on.

However, you might still choose to pay voluntary Class 2 NI to protect your State Pension record. This is optional but can be worth considering.

See our National Insurance guide for more.

What If I Make Losses Every Year?

Recurring losses can raise questions:

Is this a hobby? HMRC may question whether you're genuinely trading with a view to profit.
Are expenses legitimate? Make sure everything you claim is genuinely for the business.
Is the business viable? Losses are normal sometimes, but persistent losses need honest review.

If you're genuinely trading (marketing, seeking clients, developing products), occasional losses are fine. But HMRC may scrutinise repeated loss claims.

Record Keeping for Losses

Keep the same records as any other year:

All income received
All expenses with evidence
Calculation showing how the loss arose
Records of any relief claimed

See our record keeping guide.

Keep records for at least 5 years after the deadline—longer if the loss is carried forward.

Common Mistakes

1. Not reporting the loss

If you don't file, you can't carry it forward. The loss is "wasted."

2. Forgetting to claim the relief in future years

When you become profitable, remember to deduct the carried-forward loss.

3. Mixing personal and business expenses

A loss from overclaiming personal expenses isn't legitimate and can cause problems.

4. Not keeping records

You need to prove the loss was real if HMRC asks.

5. Claiming losses indefinitely without review

If your business consistently loses money, reconsider whether it's viable—or whether your expense tracking is accurate.

FAQ

Do I pay tax if I made a loss?

No Income Tax on self-employed income. You may still owe tax on other income.

Can I carry a loss forward forever?

Trading losses can generally be carried forward indefinitely against future profits from the same trade.

Can I offset a loss against my salary?

Possibly. You may be able to offset against other income, but there are rules. Check HMRC guidance.

What if I'm employed and made a self-employed loss?

You might be able to offset against your employment income. Get advice if the amounts are significant.

Do I still file a Self Assessment for a loss?

You're not required to, but you should—otherwise you can't claim the relief.

Can I get a refund if I made a loss?

Only if you've overpaid tax elsewhere and can offset the loss. Pure losses don't generate refunds on their own.

Is there a limit to how much loss I can claim?

There can be limits on offsetting against other income. Carrying forward against the same trade is generally unlimited.

What about Class 2 NI?

You won't owe Class 4, but you might want to pay voluntary Class 2 to protect your pension record.

How do I prove it's a genuine business?

Show you're trading commercially: marketing, client communications, business development. Not just a hobby with expenses.

What if HMRC questions my loss?

Provide evidence: income records, expense receipts, bank statements. Good records protect you.

Next Steps

If you've made a loss, make sure you file and record it properly. When you're profitable again, you'll be glad you did.

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This guide is for general information only. Tax rules change, and everyone's situation is different. Always check the latest HMRC guidance and consider speaking to a qualified accountant if you're unsure.