What this post covers. For a UK trading company that holds surplus cash or a portfolio alongside its trade, the same four corporation-tax regimes apply to the investment side as for a pure investment company. This post walks each regime at the applied level — what it means in practice for a trading company’s portfolio — and explains the two structural features that differ: how portfolio-related costs are deducted, and where the boundary between trading company and investment company sits. It does not resolve the characterisation question. That is your accountant’s call.

Most UK trading companies with surplus cash are surprised to learn that the cash isn’t sitting in a tax-free corner. The same four corporation-tax regimes that apply to a Family Investment Company apply to a trading company’s portfolio — loan relationships on the cash and any bonds, chargeable gains on any equities, the dividend exemption on any dividends, and the FX rules on any foreign holdings. What changes is how the company’s costs are deducted (management expenses under CTA 2009 s.1219 are available for the investment-side activity) and whether the company stays a trading company for tax purposes (the wholly or mainly test in CTA 2010 s.18N is the boundary line). This post walks both — assuming the company is still a trading company. The characterisation question itself is a fact-driven call your accountant makes annually.

In brief:

  • A UK trading company holding surplus cash sits inside the same four tax regimes as a pure investment company: loan relationships (interest, bonds, deposits), chargeable gains (equities, ETFs), dividend exemption (dividends received), and FX (foreign holdings).
  • A trading company that holds portfolio assets typically also has investment business under CTA 2009 s.1218B’s wholly or partly test — so it can usually claim management expenses (s.1219) for portfolio-related costs.
  • It does not typically meet CTA 2010 s.18N’s wholly or mainly test, so it stays out of Close Investment-Holding Company (CIHC) status and keeps small-profits-rate access.
  • The asymmetry: a pure investment company gets s.1219 management expenses on all its costs (because they all relate to its investment business); a trading company gets s.1219 only on the portfolio-related slice.
  • The characterisation question — am I still a trading company? — is fact-driven and reviewed annually by your accountant. A growing portfolio combined with a declining trade can shift the answer; this post describes the regimes, not the call.

This post assumes the characterisation question is settled

Two questions sit behind every discussion of investment returns in a trading company. This post answers only the first.

Question one: Given your company is still a trading company for tax purposes, how are portfolio returns taxed alongside the trade? This is what this post addresses. The four regime sections below walk through the answer — loan relationships, chargeable gains, dividend exemption, FX — at the applied level for a trading company’s portfolio.

Question two: Is your company still a trading company for tax purposes? This is the characterisation question. Whether a company meets the wholly or mainly standard for a permitted purpose under CTA 2010 s.18N (so that it avoids CIHC status), and separately whether it remains a trading company under the broader tax tests, are fact-driven determinations. The research behind this post flags the question but does not attempt to resolve it. For the framework that applies to that determination, see our piece on investment company vs trading company status.

This separation is not a rhetorical move — it is the reason this post can be written at all. The regime mechanics are well-settled. The characterisation call is not.

Loan relationships: cash, bonds and deposits alongside the trade

The loan-relationships regime (CTA 2009 Part 5) is the exclusive corporation-tax regime for every money debt a company holds — cash, bonds, gilts and term deposits. For a trading company’s surplus cash and any fixed-income holdings, the treatment is identical to what a pure investment company sees: the regime follows the accounts, and the taxable credit or debit for a period is, as a starting point, the income or loss the company has recognised in its profit and loss account for that instrument.

For the typical trading company, this means:

Bank interest and cash. Interest on the company’s current account or notice accounts is a non-trading loan-relationship (NTLR) credit, recognised as it accrues. The CTA 2009 s.307 “follow the accounts” rule applies to a trading company’s cash exactly as it does to a pure investment company’s.

Bonds, gilts and money-market instruments. If surplus cash is deployed into short-dated gilts, corporate bonds or money-market instruments, the same regime applies. The s.464 priority — which makes Part 5 the exclusive regime for any matter it covers — means there is no chargeable gain on a gilt or bond even on a sale before maturity at a profit. That profit is an NTLR credit. The full mechanics are in the regime piece.

FX on foreign-currency monetary items. A USD bond or EUR cash balance is a monetary item. Under CTA 2009 s.328, exchange gains and losses are NTLR credits and debits each period, retranslated from the prior period-end rate to the current closing rate. The FX post covers this path.

Chargeable gains: equities and ETFs in the portfolio

The chargeable-gains regime applies to any listed equities or equity ETFs a trading company holds as surplus-cash investments. The mechanics are the same as for a Family Investment Company: disposals are matched against the s.104 pool — the running average-cost record of every share of one class the company holds — in the fixed statutory order (same-day acquisitions under TCGA 1992 s.105, then acquisitions in the previous nine days under s.107(3), then the pool). Indexation allowance is frozen at December 2017 by Finance Act 2018 s.26.

Two company-specific points that differ from individual CGT apply equally to a trading company and a pure investment company:

  • The matching window runs backwards (the previous nine days) not forwards. The 30-day “bed-and-breakfast” rule that applies to individuals under TCGA 1992 s.106A does not apply to companies.
  • The gain is computed on the pooled sterling cost, not on the accounting carrying amount. A trading company holding equities under FRS 102 will carry them at fair value through profit or loss, producing accounting movements each period; those movements are not CT events. The CT event is the disposal, against the pooled cost.

The CT character of the gain — a chargeable gain brought into the company’s total profits alongside the trade — is the same whether the holding sits in a FIC or in a trading company. What differs, as the sections below explain, is which cost rate applies and how portfolio-related overhead is deducted. The chargeable-gains mechanics are covered in full in the regime piece.

Dividend exemption: dividends received are largely exempt

Dividends the trading company receives on its portfolio holdings are governed by CTA 2009 Part 9A — the same charge-then-exemption mechanism that applies to a FIC. The dividend is first brought within the charge to CT under s.931A, and then almost always exempted: via the Chapter 2 small-company route (s.931B) for most owner-managed trading companies, or via a Chapter 3 exempt class (s.931F for ordinary listed shares; s.931G for sub-10% holdings) for larger companies.

The practical result for an ordinary listed portfolio is that dividends received are largely exempt from corporation tax. “Largely” because exempt is not the same as ignored: the gross dividend still feeds augmented profits — taxable total profits plus exempt distributions from non-group companies (CTA 2010 s.18L). Augmented profits determine whether the company pays the small profits rate, the main rate, or sits in the marginal relief band. A trading company just below £50,000 of taxable trading profits can find its rate band pushed upward by dividend income that itself bears no CT. Foreign dividends are recognised gross; withholding tax is a separate cost.

The dividend exemption mechanics — the small-company test, the Chapter 3 exempt classes, foreign withholding and REIT property income distributions — are in the regime piece.

FX: foreign holdings in the portfolio

For foreign holdings, the FX fork is the same as for a pure investment company — determined by what the instrument is, not what kind of company holds it.

Monetary items (foreign-currency bonds, gilts, cash): retranslated each period at the closing rate; the exchange difference is an NTLR credit or debit under CTA 2009 s.328. FX is taxed as it accrues.

Non-monetary items (foreign-currency equities, ETFs): no annual FX charge. The currency movement accumulates silently and crystallises inside the sterling chargeable gain at disposal — proceeds at the disposal-date spot rate, cost at the acquisition-date spot rate, per HMRC CG78310.

The cost-deduction route: management expenses on the investment side

Here is the first structural difference between a trading company’s portfolio and a pure investment company’s portfolio — and it is a difference in degree rather than kind.

A company whose business consists wholly or partly in the making of investments is a “company with investment business” under CTA 2009 s.1218B. The test is broad: a company does not need to be primarily an investment business to satisfy it. A trading company that holds a portfolio of surplus-cash investments alongside its trade typically satisfies the wholly or partly test in respect of that portfolio activity. HMRC confirms this interpretation in CTM08040, noting that the earlier “wholly or mainly” test (which applied under the old ICTA 1988 s.130 “investment company” definition, a concept that is now obsolete and no longer the live test) was deliberately relaxed to the current wholly or partly standard from 1 April 2004.

The consequence is access to the management expenses deduction in CTA 2009 s.1219. Section 1219(1) allows “expenses of management of the company’s investment business which are referable to that accounting period” as a deduction from total profits. Per HMRC CTM08580, the deduction is mandatory — no election is required, and it runs through Step 2 of CTA 2010 s.4(2), reducing total profits after the income and chargeable-gains pots have been combined.

The asymmetry with a pure investment company. A pure investment company’s management expenses cover all its costs — because all its activity is investment business and all its overhead is referable to that investment business. A trading company’s s.1219 claim covers only the portfolio-related slice: custody fees, investment advisory fees, and accountancy costs referable to the investment activity. The trading overhead — the cost of running the trade — is deductible through the trading income computation under CTA 2009 Part 3, not through s.1219. The two deduction routes run in parallel; neither displaces the other.

What counts as a management expense? The test (Capital and National Trust Ltd v Golder [1949], cited at HMRC CTM08150) is “expenses of managing the investment business” rather than expenses incurred in carrying out the business itself. In practice: directors’ fees referable to investment oversight, custody and platform fees, investment advisory fees, and portfolio-specific accounting costs are in scope. Expenses that are capital in nature are not allowable (CTA 2009 s.1219(3)(a)); following HMRC v Centrica Overseas Holdings Ltd [2024] UKSC 25, abortive deal costs on potential capital disposals are capital in nature and not deductible. Excess management expenses carry forward indefinitely under CTA 2009 s.1223 against future total profits.

The CIHC boundary: why the typical trading company stays out

The second structural difference — and the more consequential one for rate purposes — is the relationship between a trading company and Close Investment-Holding Company (CIHC) status.

A Close Investment-Holding Company is defined in CTA 2010 s.18N as a close company (broadly, one controlled by five or fewer participators under CTA 2010 s.439) that does not exist wholly or mainly for one or more permitted purposes. Permitted purposes include carrying on a trade on a commercial basis, and holding shares in or making loans to qualifying trading companies. The rate consequence of CIHC status is material: a CIHC is excluded from the small profits rate and marginal relief, and pays corporation tax at the full main rate — currently 25% — on every pound of taxable profit regardless of profit size, per HMRC CTM03951.

For a company that is carrying on a trade on a commercial basis — the typical trading company with surplus cash — its existence is wholly or mainly for a permitted purpose: the trade. It does not meet the wholly or mainly CIHC test, and it is therefore not a CIHC. It keeps access to the small profits rate (19% on profits at or below £50,000 for the financial year 2026, under Finance Act 2025 s.14) and marginal relief.

The test asymmetry is load-bearing here. The wholly or partly test in s.1218B (company with investment business) is broad — even a small portfolio alongside a substantial trade qualifies. The wholly or mainly test in s.18N (CIHC) is narrower — the company has to exist mainly for non-permitted purposes to become a CIHC. For the typical trading company, the portfolio is a minority of the balance sheet and the trade is the dominant activity: the s.1218B test is satisfied (giving access to management expenses) while the s.18N test is not met (preserving the small profits rate). Both outcomes flow from the same factual position.

The lower limit (£50,000) and upper limit (£250,000) for Finance Act 2025-year purposes are divided by the number of associated companies under CTA 2010 ss.18E–18J. A trading company with associated entities sees its thresholds reduced accordingly.

The characterisation risk: what can shift the answer

A growing portfolio and a declining trade can, over time, shift the factual position. If investment activity starts to dominate — by balance sheet value, by income stream, or by management time — the wholly or mainly assessment under s.18N changes. A company clearly not a CIHC in year one may be on the boundary in year five. Anti-avoidance scrutiny also exists where the balance of activity is close to the line. The consequences of a reclassification are rate-relevant and not trivial.

Whether the trading-company assumption holds for a specific company in a specific period is a fact-driven judgement the accountant reviews annually. The framework that governs that determination is the subject of a separate piece; this one assumes the answer is settled.

The portfolio sits alongside the trade, not in front of it

The investment side of a trading company has its own CT character running in parallel with the trading income computation. The two streams are structurally independent. Bank interest and bond returns flow through the NTLR total. Equity gains flow through the chargeable-gains computation. Dividends are largely exempt but feed augmented profits. Portfolio-related overhead is deductible as management expenses on the portfolio-side slice. And — provided the trade remains the dominant activity — none of this shifts the company into CIHC status or costs it the small profits rate.

That is the regime picture for surplus cash alongside the trade. For the legal form that underlies all these structures — FIC, HoldCo, SPV as use-case labels on one legal spine — see the companion piece.

Sources

Legislation

HMRC manuals

  • CTM08040 — company with investment business: definition and the wholly or partly test. gov.uk
  • CTM08150 — management expenses: general principles (Capital and National Trust Ltd v Golder). gov.uk
  • CTM08580 — management expenses: method of relief and computation (deduction mandatory; no election required). gov.uk
  • CTM03951 — Close Investment-Holding Companies: rate consequence under the post-2023 regime. gov.uk
  • CTM60710 — CIHC: statutory definition and permitted purposes. gov.uk
  • CG78310 — foreign-currency disposals: per-leg-at-spot translation rule (Bentley v Pike). gov.uk

Case law

  • HMRC v Centrica Overseas Holdings Ltd [2024] UKSC 25 — capital nature of abortive deal costs; deductibility as management expenses.
  • Capital and National Trust Ltd v Golder [1949] 2 All ER 956 (CA) — management expenses: “expenses of management”, not expenses incurred by management in carrying out the business.

Last reviewed: 2026-06-01.