Is a UK Corporation Tax repayment from a loss carry-back reported on the current year's Form 5471 Schedule E?

No. The IRS Instructions for Form 5471 say adjustments to a prior year's foreign taxes, including refunds, should not be reflected on Schedule E in the year of adjustment. The refund reduces the tax of the year it relates to, which may require an amended return under section 905(c). The loss year's Schedule E shows only that year's own tax.

How far back can a UK company carry a trading loss?

HMRC guidance says a trading loss can be carried back to the earlier 12 month period, provided the company carried on the same trade at some point in that period. Profits of an accounting period that straddles the start of the window are time-apportioned. A longer look-back is described for terminal losses where the trade has ceased, and the temporary three-year extension has ended.

What is the time limit for a UK loss carry-back claim?

HMRC's guidance states that the claim must be made within 2 years of the end of the accounting period in which the loss was made. It is made in the Company Tax Return for the loss period, in an amendment to that return if still in time, or by letter, and it should state the company, the loss period, the amount and how the loss is used.

Does the US owner have to tell the IRS about the HMRC refund?

Section 905(c) says that where foreign tax that was paid is refunded in whole or in part, the taxpayer shall notify the Secretary, who redetermines the tax for the year or years affected. Where a credit was claimed for the profit year, that normally means revisiting that year's return. The detailed procedure is set by regulations and form instructions.

Does the UK loss reduce the US income already reported for the profit year?

No. The carry-back is a UK relief. For US purposes the profit year keeps its income and loses part of its foreign tax deduction, so tested income and earnings and profits for that year go up, not down. The loss year is reported separately, generally as a tested loss on Schedule I-1 with a current-year deficit on Schedules H and J.

Is HMRC repayment interest on the Corporation Tax refund taxable?

Yes on the UK side: HMRC tells companies to include the interest as income in the Company Tax Return. On the US side it is income of the company in the year it arises and it is also relevant under section 905(c), which generally limits US interest on a redetermination for the period before the refund was received unless the foreign country paid interest for that period.

Form 5471 and a UK Corporation Tax Loss Carry-Back

Form 5471 is affected in two years at once when a US owner's UK company carries a trading loss back and HMRC repays Corporation Tax: the loss year, where the loss and the tax receivable are reported, and the earlier profit year, whose foreign tax has just been reduced. The repayment is a refund of foreign income tax, and for US purposes a refund of foreign tax is a foreign tax redetermination under section 905(c) of the Internal Revenue Code. That means the profit year's Schedule E, its tested income, its earnings and profits and any credit the owner claimed for that year all need to be looked at again, usually through an amended return rather than a quiet adjustment in the current year.

On the UK side a carry-back looks simple: a repayment from HMRC. On the US side the same repayment changes a year that has already been filed. In the returns we prepare for US owners of UK companies, the claim is often made by the UK accountant months before the US preparer hears of it, and the first sign is an unexplained tax receivable on the UK balance sheet.

What does a UK loss carry-back mean for Form 5471?

A UK loss carry-back is a claim to set a company's trading loss against the profits of an earlier period so that Corporation Tax already paid for that period is repaid. For Form 5471 it has four consequences.

The profit year: the foreign tax reported for that year on Schedule E was too high in hindsight, so tested income, any subpart F computation, any high-tax position and current earnings and profits for that year all move.
The loss year: the company reports a loss on Schedule C, usually a tested loss on Schedule I-1 and a current-year deficit in earnings and profits on Schedule H and Schedule J.
The balance sheet: until HMRC pays, the repayment is an asset of the company and belongs on Schedule F at the year end.
The owner's own return: where a section 962 election or a deemed-paid foreign tax credit was claimed for the profit year, the credit was computed on tax that has now been partly refunded.

How does the UK carry-back of a trading loss work?

HMRC's guidance at https://www.gov.uk/guidance/corporation-tax-calculating-and-claiming-a-loss explains that a trading loss can be carried back to the earlier 12 month period, and it is careful to say 12 month period rather than earlier accounting period. The distinction matters when the company has changed its year end. If an earlier accounting period straddles the start of that 12 month window, its profits are time-apportioned and only the part falling inside the window can be relieved.

The Company Taxation Manual at https://www.gov.uk/hmrc-internal-manuals/company-taxation-manual/ctm04510 gives the statutory basis as sections 37 to 39 of the Corporation Tax Act 2010. It describes the carry-back as available where the trading loss exceeds the profits of the loss-making accounting period itself, with the excess going against the profits of preceding accounting periods that fall wholly or partly within the twelve months ending immediately before the loss-making period began. Four points from that page and from HMRC's guidance are worth keeping in view:

Same trade: the company must have been carrying on the trade in which the loss arose at some time in the earlier period. It does not have to have carried it on for the whole period.
Order of set-off: where more than one earlier period is in play, the later period's profits are relieved before those of an earlier one.
Cessation: where the trade has ceased, the manual describes a longer, three-year look-back for the terminal loss, which is a separate claim with its own conditions.
No extended carry-back now: the temporary three-year extension applied to accounting periods ending between 1 April 2020 and 31 March 2022, and HMRC's guidance records that the last date for those claims was 31 March 2024.

The alternative is to carry the loss forward. HMRC's guidance says that losses not used in another way can be set against profits of future accounting periods, and that relief for most carried-forward losses is limited to an allowance of up to £5 million plus 50% of the remaining total profits after that allowance. For an owner-managed company the real choice is one of timing: a repayment now against relief later.

How do you claim the carry-back and when does HMRC repay?

According to the same HMRC guidance, the claim is made in the Company Tax Return for the period in which the loss was made, or in an amendment to that return if it is still within the time limit to amend, and it can also be made by letter. The claim must be made within 2 years of the end of the accounting period in which the loss arose. It should identify the company, the period of the loss, the amount of the loss and how the loss is to be used, and where the claim reduces Corporation Tax for an earlier period the appropriate box on form CT600 is marked.

On repayment, HMRC says that if the loss is offset against a period for which tax has already been paid it will send a repayment, unless the company owes Corporation Tax, in which case the repayment is first deducted from what is owed. The page at https://www.gov.uk/get-refund-interest-corporation-tax adds that HMRC may also use a refund against other tax the company owes, such as PAYE or VAT, or against the next Corporation Tax bill. That matters for the US file, because a refund that is applied against another liability rather than paid into the bank is still a refund of the earlier year's Corporation Tax.

The same page deals with interest. HMRC distinguishes credit interest, paid where tax was paid early, from repayment interest, paid where the company paid more than it owed, and it tells companies to include the interest as income in the Company Tax Return because it is taxable. When we read the page on 10 October 2026 it showed a rate of 2.75%. HMRC interest rates move, and the date from which interest runs on a repayment created by a carried-back loss has its own rules, so we take the interest figure from HMRC's repayment calculation rather than estimating it.

Why is the HMRC repayment a foreign tax redetermination for US purposes?

A foreign tax redetermination is a change in the amount of foreign tax that was taken into account in an earlier US tax year. The statute is short on this. Section 905(c)(1), which can be read at https://www.law.cornell.edu/uscode/text/26/905, lists three situations: accrued taxes that differ from the amounts claimed when they are paid, accrued taxes not paid within two years after the close of the taxable year to which they relate, and any tax paid that is refunded in whole or in part. In each case the wording is that the taxpayer shall notify the Secretary, who shall redetermine the amount of the tax for the year or years affected.

A UK Corporation Tax repayment generated by a carry-back falls squarely into the third situation. It does not matter that the cause is a later loss rather than an error in the original computation.

Three further points from section 905(c) shape how we handle the file. First, any additional US tax that results is payable on notice and demand. Second, the statute provides that interest is generally not assessed on that additional tax for the period before the refund was received, except to the extent the foreign country paid interest on the refund for that period. HMRC repayment interest is therefore not just a line of UK taxable income, it is a fact that goes into the US interest position. Third, the detailed mechanics, including how and when the notification is made, sit in the Treasury regulations under section 905(c) and in the instructions to the credit forms. We work from those for each return and we do not quote a notification deadline here because the answer depends on the type of filer and the year.

Which year's Schedule E does the refund belong on?

The refund belongs to the year the tax relates to, not the year HMRC pays it. The IRS Instructions for Form 5471 (Rev. December 2025) at https://www.irs.gov/instructions/i5471 are explicit in the Schedule E instructions: adjustments to a prior year's foreign taxes should not be reflected on Schedule E in the year of adjustment. They are taken into account in the year to which the tax relates, which the instructions note may require an amended return under section 905(c). The instructions list refunds alongside additional payments and accrued amounts not paid within two years as the adjustments in question, and they include an example in which a refund of a prior-year tax is dealt with by reporting the current year's tax separately and amending the prior year.

So the loss year's Schedule E is not netted down by the HMRC repayment. If the company has no UK tax for the loss year, the loss year's Schedule E simply shows none, and the profit year's Schedule E is corrected. Schedule E-1 has its own place for this. The instructions describe line 2 of Schedule E-1 as reflecting adjustments to a US person's foreign tax credit as a result of redetermined foreign income taxes, and they limit its use to cases where an intervening year was not itself amended. Line 1b of the same schedule deals with differences from the prior-year closing balance and requires an explanation. The failure mode we see most often is the refund entered as negative tax in the loss year, which leaves the profit year wrong.

How does the refund change the profit year's tested income, subpart F and high-tax positions?

Foreign income tax is a deduction in arriving at tested income. On Schedule I-1 the instructions describe line 5 as the deductions allocable to gross tested income, including taxes, and line 6 as net tested income or loss. If the UK tax for the profit year falls, the deduction falls and the profit year's tested income rises by the same amount. Where the company had subpart F income in the profit year, the tax allocated against that income moves in the same way. The UK loss itself does not travel back for US purposes. The carry-back is a UK relief; the US computation of the profit year's income is unchanged apart from the tax.

The high-tax positions are where the larger surprises sit. Schedule I-1 line 2c carries amounts excluded from tested income by reason of section 954(b)(4), and the Schedule G instructions describe the high-tax question by reference to income taxed at an effective rate above 90% of the maximum rate in section 11. An exclusion or exception that was comfortably available on the tax originally paid may no longer be available once part of that tax has been refunded, because the test is applied to the foreign tax actually borne. A carry-back that repays most of a year's Corporation Tax can turn a high-taxed year into a low-taxed one after the event. We re-run the test for the profit year on the redetermined tax before any amended return is drafted.

What happens to earnings and profits on Schedule H and Schedule J?

Schedule H computes the company's current-year earnings and profits for US purposes, starting from book income and adjusting on lines 2a to 2i. The instructions for line 2g, the taxes line, say that it reconciles the tax expense in the accounts with the taxes taken into account for earnings and profits, and they specifically mention an adjustment for a foreign tax redetermination.

In the UK accounts the benefit of the carry-back is normally recognised in the loss year, as a current tax credit in the profit and loss account. Schedule C follows the accounts: the instructions put income tax expense or benefit on line 21, with current tax on line 21a and deferred tax on line 21b, reported in functional currency under US GAAP. For earnings and profits, though, the refund reduces the tax of the profit year. In our preparation the tax benefit sitting in the loss year's book income is therefore reversed through line 2g for the loss year, and the profit year's earnings and profits are increased. Schedule J then takes the current-year figure from Schedule H at line 3, and the instructions provide lines 1b and 12 for prior-year differences and other adjustments, each with a statement. Schedule J has no dedicated redetermination line, so the attached statement matters.

Schedule F is the simplest piece. The instructions require the balance sheet in US dollars, translated under US GAAP principles. A repayment claimed but not yet received at the year end is a receivable of the company and appears among its assets; once HMRC pays, it becomes cash.

How is the loss year itself reported?

The loss year is reported as a loss year. Schedule C shows the trading loss in pounds, Schedule H converts book loss to a current-year deficit in earnings and profits, and Schedule J carries that deficit into the accumulated balances. On Schedule I-1 the instructions say line 6 can be positive or negative; where it is negative the company has a tested loss, and the instructions direct that the foreign taxes on line 7 and the qualified business asset investment on line 8 are entered as zero. The tested income regime works year by year at the shareholder level, so the company's tested loss in the loss year does not go back to shelter the profit year's inclusion in the way the UK loss went back against UK profits. The UK system refunds the earlier tax; the US system keeps the earlier income and removes the tax that sat against it.

The filing obligation does not shrink because the year was unprofitable. A sole US owner of a UK company typically meets both Category 4 and Category 5a, and the instructions say that such a filer checks only the Category 4 box and leaves the Category 5a box blank, while still completing every schedule that applies.

What if the owner made a section 962 election or claimed a deemed-paid credit?

This is the case with the most at stake for an individual owner. A section 962 election allows an individual US shareholder to be taxed on subpart F and tested income inclusions broadly as a domestic corporation would be, which brings access to a deemed-paid credit for the company's foreign income tax. If that election was made for the profit year, the credit claimed on the owner's return was measured by UK Corporation Tax that has now been partly repaid. The inclusion is higher than reported and the creditable tax is lower than reported, and both changes push in the same direction.

We describe the consequence qualitatively because the arithmetic depends on the year, the limitation and what else is on the return: a refund of the foreign tax can require the earlier US return to be revisited and US tax for that year to be recomputed, and section 905(c) places the duty to notify on the taxpayer. The Code also contains a separate penalty for failing to give that notice; we do not quote an amount here. An owner who made no election and claimed no credit is not automatically untouched either, because the profit year's inclusion was itself computed after deducting the tax that has been refunded.

Which exchange rate translates the refund?

Section 986(a), at https://www.law.cornell.edu/uscode/text/26/986, sets the starting rule for accrual-basis taxes: the amount of any foreign income taxes, and any adjustment to them, is translated into dollars using the average exchange rate for the taxable year to which the taxes relate. For a UK company that accrues its Corporation Tax, the refund is therefore measured at the profit year's average rate, not the rate on the day HMRC pays. For taxes outside the average-rate rule, the same section says that a refund or credit of foreign income taxes is translated using the exchange rate at the time of the original payment. Either way the statute looks back to the original year, not to the day HMRC pays. Schedule E, column (j) is completed in local currency in any event.

Worked scenario: a £120,000 loss carried back against a £200,000 profit year

The following figures are an illustration only. They are not a client's figures, the tax amounts are assumptions chosen to make the arithmetic visible and are not a statement of UK Corporation Tax rates, and we have left dollar translation out deliberately. Assume the accounts and the tax computation agree, and that the US citizen owner holds 100% of the company.

Year 1, to 31 December 2024: trading profit of £200,000. Assumed UK Corporation Tax paid of £50,000.
Year 2, to 31 December 2025: trading loss of £120,000 and no other income. No UK tax due for the year.
Claim: the whole £120,000 is carried back against Year 1 in the Year 2 Company Tax Return, inside the 2 year limit. Year 1 UK taxable profits become £80,000.
Assumed revised Year 1 UK tax: £20,000. HMRC repayment: £30,000, plus repayment interest calculated by HMRC.
Year 1 for US purposes, as originally filed: income of £200,000 less £50,000 of tax, so £150,000 after tax.
Year 1 for US purposes, redetermined: income of £200,000 less £20,000 of tax, so £180,000 after tax. Tested income and earnings and profits are each £30,000 higher.
Simple ratio of UK tax to pre-tax income for Year 1: 25% as filed, 10% as redetermined. This is plain arithmetic for illustration, not the regulatory effective rate computation.

On these assumptions the Year 2 accounts show a pre-tax loss of £120,000 and a tax credit of £30,000, so a book loss of £90,000 with a £30,000 receivable from HMRC on the balance sheet. The Year 2 Form 5471 reports the tax credit on Schedule C line 21a and the receivable on Schedule F. On Schedule H the £30,000 is taken out through line 2g, because for earnings and profits it belongs to Year 1, leaving a Year 2 deficit of £120,000 and a tested loss on Schedule I-1. The Year 1 Form 5471 is corrected so that Schedule E shows £20,000 of tax rather than £50,000, tested income and earnings and profits rise by £30,000, and any high-tax position taken for Year 1 is retested. If the owner made a section 962 election for Year 1, the deemed-paid credit on the Year 1 return is recomputed on the lower tax.

Should the company carry back or carry forward when the owner is a US person?

The UK computation and the US computation can point in different directions, and the claim is the company's to make within the 2 year window. A carry-back delivers cash and certainty in the UK but reopens a filed US year. A carry-forward leaves the profit year's Schedule E, credits and high-tax positions exactly as filed and instead lowers UK tax in a future year, where the reduced foreign tax will be reflected in that future year's Form 5471 in the ordinary way. In practice we prepare the US figures for both routes before the UK claim is filed, so the owner sees the repayment and its US cost side by side. Once HMRC has repaid, the US consequences are a matter of accurate reporting.

What do we collect before preparing the returns?

The Company Tax Return and computation for the loss year, showing the claim and the amount carried back.
The revised computation for the profit year and HMRC's repayment notice, including the date of payment and any repayment interest.
Evidence of how the repayment was received: paid to the bank, or set against another HMRC liability.
The profit year's Form 5471 as filed, with Schedules E, E-1, H, I-1, J and Q, and the owner's return for that year including any section 962 election statement.
The original payment dates and amounts for the profit year's Corporation Tax, which support the translation of both the tax and the refund.

We prepare the amended profit year filing and the loss year Form 5471 together, with one statement that explains the redetermination and ties the sterling figures across both years.