Do I report UK corporation tax instalments paid or the final liability on Form 5471?

Report the UK corporation tax accrued for the accounting period that matches the CFC's tax year, measured as the final liability on the company tax return. Quarterly instalments are payments on account, so an overpaid instalment that HMRC later repays was never tax and should not appear in Schedule E column (j). Using the final liability avoids a refund-driven section 905(c) redetermination later.

Which UK companies pay corporation tax in quarterly instalments?

GOV.UK treats a company as large if its profits are at an annual rate above £1.5 million but below £20 million, and very large above £20 million for accounting periods beginning on or after 1 April 2019. For periods beginning on or after 1 April 2023 the limits are divided by associated companies plus one. A company whose total liability is under £10,000 does not pay by instalments.

What exchange rate do I use to translate UK corporation tax on Schedule E?

Generally the average exchange rate for the CFC's tax year to which the tax relates, under section 986(a), entered as pounds per one US dollar. The dates and spot rates of individual instalments are irrelevant in the ordinary case. Tax paid more than 2 years after the year end, or before the year begins, is translated at the rate when paid instead.

Is HMRC interest on late instalments a creditable foreign tax?

No. HMRC debit interest on late or underpaid instalments is interest, not an income tax, so it never goes on Schedule E. GOV.UK says it is deductible for UK corporation tax purposes, and on Form 5471 it is an expense on Schedule C that reduces earnings and profits. Credit interest paid by HMRC is taxable in the UK and is income on Schedule C.

If I own all of my UK company, which Form 5471 category do I check?

A US person owning more than 50 percent of a UK company is usually both a Category 4 and a Category 5a filer. The IRS instructions say to check only the Category 4 box and leave Category 5a blank. The schedules required for both categories, including Schedules C, E, H and I-1, are still completed for each CFC year.

Form 5471 and UK Corporation Tax Quarterly Instalments

Q: What happens if HMRC increases the tax after an enquiry?

The additional UK tax relates back to the original accounting period. The Form 5471 instructions say prior-year adjustments are not reported on Schedule E in the year of adjustment but in the year to which the taxes relate, which may need an amended return under section 905(c). If paid within 2 years of that year end, it is translated at that year's average rate.

Form 5471 reports the UK corporation tax of a controlled foreign corporation on an accrual basis for the CFC's tax year, so the figure that matters is the final UK liability for the accounting period, not the four quarterly instalment payments the company sent to HMRC. The instalments are cash deposits against that liability. When HMRC later repays an overpayment, charges interest on a shortfall, or increases the tax after an enquiry, the US side follows a separate set of rules: the change is pushed back to the year the tax relates to, translated at the right exchange rate, and may require a redetermination of the US shareholder's foreign tax credit.

This guide is for US citizens and green card holders who own a profitable UK company inside the quarterly instalment regime. In the returns we prepare, the instalment cycle is where most Form 5471 errors start: a cash figure where an accrual belongs, the wrong exchange rate, or a UK repayment that never reaches the US return.

How does Form 5471 treat UK corporation tax paid by quarterly instalments?

Form 5471 is the information return a US person files for certain interests in a foreign corporation. For a UK CFC, it does not ask how many payments the company made or when. It asks for the income statement in functional currency (Schedule C), foreign income taxes paid or accrued for the CFC's tax year (Schedule E), current earnings and profits (Schedule H), and the tested income figures for Form 8992 (Schedule I-1). The IRS instructions are at https://www.irs.gov/instructions/i5471 and the form page at https://www.irs.gov/forms-pubs/about-form-5471 lists current revisions.

The key distinction: a quarterly instalment is a payment on account, while the corporation tax accrued for the accounting period is what the company actually owes once profits are fixed. An overpaid instalment was never tax; it is a deposit HMRC repays. An underpayment is still tax for that period, even though it is settled later. Form 5471 follows the liability, not the cash.

Which UK companies pay corporation tax by quarterly instalments?

HMRC splits the instalment regime into large and very large companies. According to the GOV.UK guidance at https://www.gov.uk/guidance/corporation-tax-paying-in-instalments, a company is large if its profits are at an annual rate of more than £1.5 million but less than £20 million. The separate guidance at https://www.gov.uk/guidance/pay-corporation-tax-if-youre-a-very-large-company explains that a company with profits at an annual rate of more than £20 million, for an accounting period beginning on or after 1 April 2019, is very large and pays on an earlier timetable.

Associated companies reduce the thresholds. For accounting periods beginning on or after 1 April 2023, GOV.UK explains that the limits are divided by the number of associated companies plus the company itself. A US owner with several UK companies can therefore be in the instalment regime at far lower profit levels than the headline figure suggests.
A small-liability exception applies. A company does not need to pay by instalments if its total corporation tax liability for the accounting period is less than £10,000.
A first-year exception can apply to large companies. GOV.UK explains that a company that becomes large may avoid instalments for that period if its profits are no more than £10 million (also divided for associated companies) and it meets the conditions about earlier periods set out in the guidance.

When are the instalments due for large and very large companies?

For a large company with a 12-month accounting period, GOV.UK sets out four equal instalments: the first is due 6 months and 13 days after the first day of the accounting period, the second 3 months later, the third 3 months after that (which is 14 days after the period ends), and the last 3 months and 14 days after the period ends. Half of the payments therefore fall after the year has closed.

For a very large company, the guidance says the four equal instalments fall on the 14th day of months 3, 6, 9 and 12 of the accounting period, so the whole liability is paid inside the period itself. HMRC's own manual page at https://www.gov.uk/hmrc-internal-manuals/company-taxation-manual/ctm92805 sets out the same 12-month due dates. Because a very large company pays everything before its year ends, it relies even more heavily on forecasts, and the gap between instalments paid and final liability tends to be larger. That gap is exactly what Form 5471 needs you to strip out.

Who files Form 5471 for a UK company, and which category applies?

A US citizen or resident who owns a profitable UK company outright is typically both a Category 4 filer (a US person with control, meaning more than 50 percent of the voting power or value) and a Category 5a filer (a US shareholder of a CFC). The IRS instructions say that a filer meeting both should only check the box for Category 4 and leave the box for Category 5a blank. The filing obligations of both categories still apply, so the full set of schedules is completed.

Minority US shareholders may be Category 5 filers only. The instructions also note that Schedule E must be completed even for noncorporate US shareholders, and that noncorporate filers may need it for a section 962 election.

Where does UK corporation tax appear on Form 5471 Schedule C?

Schedule C is the CFC's income statement. The IRS instructions say to report all information in the foreign corporation's functional currency in accordance with US GAAP. For most UK trading companies the functional currency is sterling. Income tax expense goes on line 21, reported in accordance with US GAAP under ASC 740, with the current portion on line 21a and deferred tax on line 21b. Transactional taxes that are not part of income tax expense go on line 16 instead.

This is the first place instalments cause trouble. A UK set of accounts records a current tax charge for the year and a corporation tax creditor or debtor on the balance sheet, depending on whether instalments ran ahead of or behind the liability. Only the charge belongs on line 21a. The cash paid in instalments, and any receivable for overpaid instalments, are balance sheet items. Where the company prepares UK accounts under FRS 102, the preparer has to bring the tax charge onto a US GAAP footing for Schedule C, including any deferred tax differences.

Current UK corporation tax charge for the accounting period: Schedule C, line 21a.
Deferred tax charge or credit: Schedule C, line 21b.
Credit interest received from HMRC on overpaid instalments: interest income on Schedule C, not a reduction of tax expense.
Debit interest charged by HMRC on late or underpaid instalments: an expense on Schedule C, never part of income tax expense.
Instalments paid and the year-end corporation tax creditor or debtor: balance sheet items on Schedule F, not income statement items.

How do you report instalments on Schedule E: paid, accrued or final liability?

Schedule E reports the CFC's foreign income taxes. The instructions describe column (e) as the tax year and note that the foreign tax year under foreign tax law may not be the same as the US tax year of the foreign corporation. Column (g) is the income reported to the foreign tax authority under foreign tax law. Column (i) is the three-letter currency code of the currency in which the tax is payable, which is GBP for UK corporation tax. Column (j) is the tax paid or accrued in that local currency. Columns (k) and (l) carry the exchange rate and the US dollar amount.

For an instalment-paying UK company, column (j) should be the UK corporation tax accrued for the accounting period that corresponds to the CFC's US tax year, measured as the final liability on the company tax return once it is filed. It should not be the sum of instalments paid during the calendar year, and it should not include amounts that HMRC will repay. If the company overpaid by £80,000, that £80,000 was never tax. Reporting it on Schedule E would overstate the deemed-paid credit and set up a refund-driven redetermination later.

Part III of Schedule E is where taxes for which foreign tax credits are not allowed are reported. UK corporation tax on ordinary trading profits is normally a creditable income tax, so it sits in Part I. Interest and penalties charged by HMRC are not income taxes and do not belong anywhere on Schedule E.

Which exchange rate translates UK corporation tax on Form 5471?

The IRS instructions say you must generally use the average exchange rate as defined in section 986(a), expressed as the units of foreign currency that equal one US dollar. The statute, at https://www.law.cornell.edu/uscode/text/26/986, says that for a taxpayer taking foreign income taxes into account when accrued, the taxes and any adjustments are translated at the average exchange rate for the taxable year to which the taxes relate.

This is the gap angle most published guidance skips. Instalments for a large company are paid on four different dates, two of them after the year has ended, at four different spot rates. None of those spot rates matter for Schedule E in the ordinary case. The whole year's UK corporation tax is translated at the single average rate for the CFC's tax year to which it relates. Section 986(a) carves out exceptions: taxes paid more than 2 years after the close of the year they relate to, taxes paid before that year begins, and taxes in an inflationary currency. Those excluded taxes, and adjustments to them, are translated at the rate when paid under section 986(a)(2), and refunds or credits are translated at the rate that applied when the original payment was made.

Ordinary case: final UK liability for the period, translated at the average rate for the CFC's tax year.
Additional UK tax paid after an enquiry, within 2 years of the year end: added to the original year and translated at that year's average rate.
UK tax for the year paid more than 2 years after the year end: no credit on redetermination until paid, then translated at the rate when paid under section 986(a)(2).
UK tax paid before the accounting period begins: falls outside the average-rate rule and is translated at the payment-date rate.

How does Schedule H turn book tax into earnings and profits?

Schedule H reports the foreign corporation's current-year earnings and profits for US tax purposes. Line 1 starts from the functional currency GAAP income on line 22 of Schedule C. Line 2g is where differences between the income tax expense reported for book purposes and the taxes deducted or added back for earnings and profits are reflected. The current earnings and profits are then categorised and translated into US dollars at the average exchange rate.

Line 2g matters for instalment payers because book tax and earnings and profits tax often diverge. A deferred tax charge reduces book profit but generally has no earnings and profits counterpart, and a prior-year UK adjustment booked in this year's accounts relates back to the earlier year for US purposes, so the original year's Schedule H may need correcting.

What does Schedule I-1 need from the UK tax figures?

Schedule I-1 provides the information the US shareholder needs to file Form 8992, the GILTI calculation. The instructions say line 1 is the CFC's gross income, line 2c captures gross income excluded by reason of section 954(b)(4), the high-tax exception, line 5 is the deductions (including taxes) properly allocable to gross tested income, line 7 is taxes properly attributable to the CFC's tested income group, and line 8 is qualified business asset investment where the CFC has tested income.

For a UK company paying corporation tax by instalments, the high-tax exclusion is usually the most valuable decision on the return. Whether it applies depends on the effective UK rate on the relevant income, measured under US principles, compared with a threshold set by reference to the US corporate rate. That calculation uses the accrued UK tax for the year, so a wrong Schedule E figure feeds straight into a wrong high-tax test. Overstating UK tax by including overpaid instalments can make a borderline year look high-taxed when it is not; understating it by using only the instalments paid by the calendar year end can do the reverse. The election is made at the level of the controlling domestic shareholders and binds the group, so the figures need to be right before it is made.

What happens on Form 5471 when HMRC repays or increases the tax?

Section 905(c), at https://www.law.cornell.edu/uscode/text/26/905, requires the taxpayer to notify the IRS where accrued foreign taxes paid differ from the amounts claimed as credits, where accrued taxes are not paid within 2 years after the close of the year to which they relate, or where tax paid is refunded in whole or in part. The IRS then redetermines the US tax for the year or years affected. The Form 5471 instructions apply the same logic: adjustments to prior-year taxes should not be reflected on Schedule E in the year of adjustment but in the year to which the taxes relate, which may require an amended return under section 905(c).

Three UK events typically trigger this: the company tax return is filed after the US return and the final liability differs from the accrual used; an HMRC enquiry moves the liability; or a later loss is carried back and earlier tax is repaid. Repayment of overpaid instalments is not a trigger if Schedule E used the final liability, because nothing creditable was refunded.

Section 905(c)(2) adds a time limit with real teeth. If accrued taxes are not paid within 2 years after the close of the year to which they relate, no credit is allowed for them on redetermination, and when they are eventually paid they are taken into account for the year to which they relate and translated under section 986(a)(2)(A). For a UK company in a long enquiry, the date the additional tax is actually paid can therefore change both the year and the exchange rate used.

How should HMRC instalment interest be treated for UK and US purposes?

GOV.UK explains that HMRC charges debit interest on late or underpaid instalments, calculated when the company tax return is submitted, and that this interest is tax deductible for corporation tax purposes. Interest HMRC pays on overpaid or early instalments, known as credit interest, is taxable for corporation tax purposes. Credit interest runs from the later of the first instalment date or the date the overpayment arises.

On the US side, neither amount is a tax. Debit interest is an expense in Schedule C and reduces earnings and profits; credit interest is income in Schedule C. Both affect the UK taxable profit, so they change the column (g) income base and the corporation tax itself, but they never appear in column (j). In the returns we prepare, a common error is netting HMRC credit interest against the tax charge, which quietly understates both income and creditable tax.

How do you match the UK accounting period to the CFC's tax year?

UK corporation tax is charged by accounting period. The CFC's US tax year is governed by section 898, which generally aligns the tax year of a CFC with that of its majority US shareholder. The What's New section of the IRS instructions notes that section 70352 of the 2025 legislation repeals the 1-month deferral election previously allowed under section 898(c)(2), so CFCs that relied on that election have had to move to a conforming year.

Where the UK accounting period and the CFC's US tax year differ, Schedule E column (e) records the foreign tax year, and the US preparer has to determine which UK tax relates to which US year. A UK company with a 31 March year end owned by an individual on a calendar year is a common example. UK corporation tax for the period to 31 March is generally treated as accruing at the end of the UK period, so the whole of that period's tax falls in the CFC's US year that includes 31 March. Instalments paid in the following months do not change that. Getting this wrong can push a full year's UK tax into the wrong US year, distorting both the high-tax test and the deemed-paid credit.

Worked illustration: a calendar-year UK company with a refund and a late adjustment

Illustration only, with assumed figures and exchange rates. A US citizen living in London owns 100 percent of a UK trading company with no associated companies. Its accounting period and its CFC tax year both run from 1 January to 31 December 2025, and its functional currency is sterling. Profits put it in the large company band, below the very large threshold. In mid-2025 the directors forecast a corporation tax liability of £1,500,000, so the company pays four instalments of £375,000, due 14 July 2025, 14 October 2025, 14 January 2026 and 14 April 2026.

Trading softens late in the year. When the UK company tax return is finalised, the liability for the period is £1,420,000. HMRC repays the £80,000 overpayment with credit interest, which we assume is £1,200 and which is taxable for UK corporation tax purposes. Assume the average exchange rate for 2025 is 1.30 US dollars per pound, which under the divide-by convention is entered as 0.7692 pounds per dollar.

Schedule C, line 21a: current tax charge of £1,420,000 under US GAAP, not the £1,500,000 paid.
Schedule E, column (i): GBP. Column (j): £1,420,000. Column (k): 0.7692. Column (l): about $1,846,000.
The £80,000 repayment: not a refund of tax for section 905(c) purposes, because it was never accrued as tax.
The £1,200 credit interest: interest income in the period it accrues, taxable for UK corporation tax, never on Schedule E.
Schedule I-1: the high-tax analysis uses £1,420,000 of accrued tax, allocated to the tested income group under the instructions.

Now assume that in 2027 HMRC concludes an enquiry into the 2025 period and the company pays an additional £60,000 of corporation tax for 2025, plus debit interest of £3,000 (again, illustrative). The additional £60,000 is paid within 2 years of 31 December 2025, so it is an adjustment to the 2025 tax, translated at the 2025 average rate of 0.7692, adding about $78,000 to 2025 Schedule E. It is not reported on the 2027 Schedule E. The 2025 Form 5471 is amended, and the shareholder notifies the IRS and redetermines the 2025 US tax under section 905(c). The £3,000 interest is a deductible expense for UK corporation tax and an expense on Schedule C in the year it accrues; it is never creditable.

What records should a US shareholder keep for instalment-paying UK companies?

The filed UK company tax return and computations for each accounting period, showing the final liability.
HMRC's statement of account showing each instalment, its date and amount, any repayment and any debit or credit interest.
A reconciliation from UK statutory accounts (often FRS 102) to US GAAP for Schedule C, including the tax charge.
The average exchange rate used for each CFC tax year, with its source, and payment dates for any tax falling outside the average-rate rule.
Enquiry correspondence, closure notices and amended returns, with the date each additional payment or repayment was made.

Where do Form 5471 filings for UK instalment payers usually go wrong?

The failure mode we see most often is a Schedule E built from the bank statement rather than the tax computation. Close behind: payment-date spot rates instead of the average rate; prior-year UK adjustments reported in the year booked rather than the year they relate to; HMRC credit interest netted against the tax charge; and a high-tax election made on an estimate that later moves. Each fix usually means an amended return and a section 905(c) redetermination, and Form 5471 penalties apply separately to incomplete or inaccurate forms.

Our approach is to prepare the US return from the UK computation rather than the cash, translate on the statutory basis, and track every UK repayment or enquiry adjustment back to its year, so the deemed-paid credit, the high-tax analysis and earnings and profits stay consistent year to year.