A trading loss is not automatically a refund. Work out the tax-adjusted loss, then compare the reliefs available, their deadlines and the other income involved. Keep the supporting accounts and earlier claims so the same loss is not used twice.
A cash shortfall is not always a tax loss
Loan repayments, drawings and private spending can reduce the bank balance without being deductible business expenses. Equipment and other costs may need particular treatment. Your accountant should calculate the taxable result before choosing any loss-relief route.
For example, a trader may spend heavily on personal living costs while taking little money from customers. That financial pressure does not establish an allowable trading loss of the same amount.
Different reliefs serve different situations
Depending on the circumstances, a qualifying loss may be carried forward against future profits of the same trade or considered against other income. Special rules can apply to early trading losses, terminal losses and claims involving earlier years.
Conditions, claim deadlines and restrictions vary. Commerciality, the nature of the trade and particular loss-relief limits matter. Foreign trades and claims under the foreign income and gains regime can add further restrictions.
Compare the effect before making a claim
A claim against another year's income might reduce tax, but the result depends on that year's income, allowances and existing reliefs. Using a loss immediately is not necessarily the most useful option. An accountant should compare the available choices rather than assume the largest loss gives the largest refund.
Loss relief is also different from reducing payments on account. The two may interact, but changing future payments does not itself make or establish a loss claim.
Documents your accountant needs
Supply accounts, detailed income and expenses, the trading start date, previous returns, other income and any losses already carried forward. If the business has stopped, give the cessation date and explain outstanding receipts or costs.
TaxSimba can confirm whether the relevant loss calculation and claims are within the agreed service. Ask about additional work involving earlier years before proceeding. A supported claim is more valuable than an advert promising a refund before anyone has examined the records.
Name the relief route before calculating a repayment
- Current or previous-year income: eligible losses can be considered against the relevant income, subject to restrictions.
- Future profits of the same trade: unused qualifying losses may be carried forward.
- Early trade losses: the first four trading years can involve special carry-back rules.
- Terminal losses: a qualifying loss in the final 12 months can be set against relevant trade profits, with a specific carry-back order.
Use HMRC’s 2025/26 loss helpsheet for the applicable claims, deadlines and restrictions. General-income claims can affect allowances; partial claims are not freely selectable. Record the claim and unused balance. Overseas trades with a FIG claim need separate checking.
Check the home nation used for your tax calculation
Tell the accountant whether you live in England, Scotland, Wales or Northern Ireland, and about any moves during the tax year. Scottish rates differ for wages, pensions and most other taxable income; savings and dividends use UK rules. Welsh rates are set separately. Use the rules for the relevant year and your actual taxpayer status.
See Scottish Income Tax and Welsh Income Tax. These differences do not make a London address or an England-only earnings example appropriate for everyone.
Compare relief routes using the actual tax years
Illustrative preparation example.
Keep the supported loss beside other income and tax paid for the relevant years. Compare the available claims and their effect on allowances before choosing one. Record the amount used and balance remaining so later returns do not claim the same loss again.
Check: Which route is eligible, what is its deadline and what loss remains afterwards?
| Check | Practical action |
|---|---|
| Is there a supported tax loss? | Remove non-deductible private and capital items and check the accounting treatment. |
| Which relief routes are available? | Review conditions, deadlines and prior claims for the trade. |
| What is the effect across relevant years? | Compare available relief rather than assuming the fastest refund is the best outcome. |
Does every loss create a repayment?
No. A repayment depends on the available relief, income and tax paid. Some relief may be carried forward instead.
Does reducing payments on account make a loss claim?
No. Advance-payment estimates and formal loss-relief claims are separate processes.
Download a checklist for this guide
- Prepare income, costs and tax adjustments.
- Record trading start or cessation dates.
- Collect earlier returns and other-income details.
- Locate existing loss carry-forward schedules.
- Compare eligible claims and record their deadlines.