Most online content on UK Corporation Tax planning either lists the rate stack ("19% small profits rate, 25% main rate, 26.5% effective marginal") or focuses on a single mechanic (marginal relief, group relief, capital allowances) in isolation. Neither approach helps a property landlord with a portfolio of SPVs choose between competing levers or sequence the planning across multiple companies.

This page is the orchestration layer. It maps seven CT planning levers a property-LtdCo operator should consider, identifies when each applies, and points to the specialist child page for the depth treatment of each. The page does not duplicate the child pages; it organises them.

The 2026/27 frame

Three rates anchor the framework:

  • Small profits rate 19% on augmented profits up to £50,000 (in a 12-month accounting period).
  • Main rate 25% on augmented profits above £250,000.
  • Marginal relief between £50,000 and £250,000, with standard fraction 3/200, producing effective rates that rise from 19% to a maximum of about 24.94% across the band and a marginal rate of 26.5% on the last pound at the top.

The lower (£50,000) and upper (£250,000) limits divide by 1 plus the number of associated companies under CTA 2010 s.18E. For a five-SPV group each SPV's effective band is £10,000 to £50,000, not £50,000 to £250,000.

Close investment-holding companies (CIHCs) under CTA 2010 s.18N are denied the SPR and marginal relief, paying 25% main rate regardless of profit level. Most BTL SPVs with unconnected commercial tenants are protected by the qualifying-purpose carve-out at s.18N(2)(b); SPVs with below-market connected-party lets risk falling into the CIHC band under the expansive reading of s.18N(3).

The seven levers

Lever 1: CIHC avoidance via qualifying-purpose carve-out

Where it applies: every property-investment company with any connected-party let. The qualifying-purpose carve-out at CTA 2010 s.18N(2)(b) protects companies whose business consists wholly or mainly of letting land to unconnected persons on commercial terms. The s.18N(3) connected-tenant exclusion catches below-market connected lets, and HMRC's expansive reading can pull the whole company into CIHC where any connected-party let exists at below market terms.

Cost of failure: 25% main rate on all profits regardless of profit level. For a £60,000-profit SPV that would otherwise be in the SPR band, the cost is (25% − 19%) × £60,000 = £3,600 per year in extra CT.

Defensive discipline: charge market rent on every connected let; document the market-rent valuation; maintain proper tenancy paperwork; ensure the connected-party let is a small minority of the company's overall letting activity. The specialist depth lives on our property-companies marginal relief page and the upcoming marginal relief UK guide.

Lever 2: Associated-companies divisor management

Where it applies: every multi-SPV operator. Under CTA 2010 s.18E, a company is associated with another when one controls the other or both are under common control. The £50,000 and £250,000 marginal-relief limits divide by 1 plus the number of associated companies.

Cost of fragmentation: typically £1,500 to £3,000 in lost marginal relief per associated company added at mid-band profit levels. A five-SPV operator with each SPV at £75,000 profit pays 25% main rate on all £375,000 of group profit (because each SPV exceeds its divided upper limit of £62,500); the same £375,000 in one SPV with no associated companies would have paid £91,250 CT (mid-band marginal relief), a saving of about £2,500 over the five-company main-rate position.

The trade-off: fragmentation has SDLT, liability isolation, and lender benefits that may outweigh the CT cost. Each step needs explicit cost-benefit analysis. The specialist depth lives on our marginal-relief property-companies page.

Lever 3: Extraction mix optimisation

Where it applies: every owner-managed SPV. The 2026/27 rate stack puts the choices in tension:

  • Salary £5,000 (secondary-threshold floor): no NIC either side, protects state-pension qualifying record, CT-deductible.
  • Employer pension contributions: CT-deductible, no NIC, growth tax-free in the wrapper, accessible from age 55 (57 from April 2028).
  • Dividends: £500 allowance, then 10.75% basic, 35.75% higher, 39.35% additional rate. No NIC.
  • Director loan account repayment: tax-free in the director's hands while a credit balance exists, but the balance is finite.

The default sequencing for most single-director SPVs: salary £5,000, employer pension within annual allowance, dividend up to higher-rate threshold, further dividend or pension top-up case by case. The specialist depth lives on our salary-vs-dividends page (four profit-band worked examples) and the DLA repayment strategy page.

Lever 4: Group relief

Where it applies: multi-SPV groups where one SPV is loss-making and another profitable. Under CTA 2010 Part 5, a 75%-group company can surrender its current-year trading or property losses to a fellow 75%-group company. The 75% test is at the share, dividend, and winding-up rights levels under the Schedule 18 equity-holder overlay.

Typical fact pattern: SPV 1 has £100,000 of rental profit; SPV 2 has £40,000 of property-business loss (refurb-cost write-down, vacancy loss, mortgage interest exceeding rent). Group relief surrenders the £40,000 loss from SPV 2 to SPV 1. SPV 1's taxable profit drops from £100,000 to £60,000; SPV 2's loss is fully utilised in the current year rather than carried forward.

The depth on group relief eligibility (75% test, Schedule 18 overlay, consortium relief, change-of-ownership rules) lives on our group relief eligibility page.

Lever 5: Intra-group asset transfers (s.171) and the s.179 trap

Where it applies: groups planning restructuring or disposal. TCGA 1992 s.171 lets you transfer an asset between members of a 75% capital-gains group at no gain and no loss; the recipient inherits the transferor's base cost and acquisition date. Useful for cleaning an SPV before sale, separating commercial from residential property, or aligning ownership with operational structure.

The trap: TCGA 1992 s.179 imposes a degrouping charge if the transferee company leaves the group within 6 years of the s.171 transfer. The original gain that was rolled over under s.171 is reactivated and taxed at CT rates. The economic effect can be substantial because the gain may have built up over many years before the s.171 transfer.

Planning discipline: if a within-six-year disposal of the transferee is contemplated, consider Substantial Shareholding Exemption under TCGA Sch 7AC instead, or accept a chargeable disposal in the transferor and plan the tax provision. The SSE depth lives on our SSE property companies page.

Lever 6: Capital allowance stacking on commercial property

Where it applies: commercial-property SPVs only; residential BTL has very limited capital allowance scope. The available reliefs:

  • Structures and Buildings Allowance (SBA): 3% straight-line annual allowance on qualifying capital expenditure on non-residential structures and buildings (CAA 2001 Part 2A).
  • Annual Investment Allowance (AIA): £1 million annual allowance on qualifying plant and machinery expenditure (CAA 2001 s.38A).
  • First-Year Allowances (FYA): where applicable to specific qualifying expenditure (electric-vehicle charging points, energy-efficient plant).
  • Main-pool and special-rate-pool writing-down allowances: 18% and 6% reducing-balance respectively on plant and machinery within the relevant pools.

For a commercial SPV undertaking a refurbishment, sequencing the AIA, SBA, and pool allowances correctly can defer CT cash flow significantly. The depth on commercial-property capital allowances lives on our specialist capital-allowance pages.

Lever 7: Corporate Interest Restriction (CIR)

Where it applies: portfolio operators with group-wide net interest above £2 million. TIOPA 2010 Part 10 restricts group-wide net interest expense to 30% of UK tax-adjusted EBITDA (the Fixed Ratio Method). The £2 million de minimis means CIR does not bite below that threshold.

Property portfolios with £40 million of property at average 5% interest produce £2 million of interest annually, already at the threshold. The Group Ratio Method can give higher headroom for groups with high external interest cost. For most landlord-LtdCo operators below the threshold, CIR is a non-issue; for operators above it, the planning is specialist and warrants a dedicated review.

Five worked scenarios

Scenario 1: Single SPV at the marginal-relief band

Mawell Estates 1 Ltd (single SPV, no associated companies) earns augmented profits £150,000 in 2026/27.

Profits land in the £50,000 to £250,000 band. Marginal relief applies. F = (£250,000 − £150,000) × 1 × (3/200) = £1,500 marginal relief. CT at main rate £150,000 × 25% = £37,500. Less relief £1,500 = £36,000 CT. Effective rate 24.0%.

Scenario 2: Multi-SPV associated-companies impact

Mawell Estates 1 Ltd in Scenario 1 is now part of a five-SPV portfolio with four associated companies. Limits divide by 5: lower £10,000, upper £50,000.

£150,000 profits far exceed the £50,000 divided upper limit. Main rate 25% on full £150,000 = £37,500. Marginal relief disappears entirely. Cost of going from single SPV to five SPVs at this profit level: £1,500 per year per company in lost marginal relief; £7,500 across the group.

The trade-off: do the SDLT, liability isolation, and lender benefits of the five-SPV structure justify the £7,500 annual CT cost? For many operators yes, but the analysis must be explicit.

Scenario 3: CIHC denial via family-tenant trap

Singh Property Ltd owns three BTL flats. Two are let to unconnected tenants at market rent; one is let to the founder's adult daughter at £200 per month (market rent £900).

The connected-tenant let at sub-market rent risks failing the s.18N(2)(b) qualifying-purpose carve-out and triggering the s.18N(3) connected-tenant exclusion. HMRC's expansive reading would catch any below-market connected let, pulling the whole company into CIHC.

Consequence: SPR and marginal relief denied. Singh Property Ltd pays 25% main rate on all profit. At £80,000 augmented profits, the cost is £80,000 × (25% − 19%) = £4,800 per year extra CT versus the non-CIHC position.

Remediation: charge the daughter market rent £900 per month. Arm's-length terms restore the qualifying-purpose carve-out. The £700 per month rent uplift generates £4,800 CT savings; it pays for itself many times over.

Scenario 4: Group relief between SPVs

Mawell Group: parent Mawell Holdings Ltd owns 100% of Mawell Estates 1 Ltd (profitable, £100,000 profit) and 100% of Mawell Estates 2 Ltd (loss-making, £40,000 loss from refurb-cost write-down).

Mawell Estates 2 surrenders the £40,000 loss to Mawell Estates 1 under CTA 2010 Part 5 group relief (75% test satisfied at 100% direct ownership). Mawell Estates 1's profit drops to £60,000.

CT impact assuming 2 associated companies (Mawell Holdings as parent counts; Mawell Estates 1 plus Mawell Estates 2 plus Mawell Holdings = 3 associated companies; lower limit £16,667, upper £83,333): Mawell Estates 1 at £60,000 sits in the marginal-relief band (above £16,667 lower, below £83,333 upper). Marginal relief applies with divided limits. Group benefits from utilising the loss in the current year rather than carrying it forward to a future period.

Scenario 5: Intra-group restructuring with s.179 trap

Mawell Holdings Ltd wants to sell Mawell Estates 1 Ltd (which owns three properties) to an external buyer. To clean the SPV for sale, the group transfers one property out of Mawell Estates 1 to Mawell Estates 2 at no-gain-no-loss under TCGA 1992 s.171.

If Mawell Estates 1 is then sold within six years of the s.171 transfer, s.179 triggers a degrouping charge. The original gain on the transferred property (the difference between Mawell Estates 1's original base cost and the s.171 transfer value) is reactivated and taxed at CT rates on Mawell Estates 1.

Planning: if the within-six-year disposal is contemplated, consider Substantial Shareholding Exemption under TCGA Sch 7AC instead. The SSE applies to the disposal of the substantial shareholding (10%+ for 12+ months) where the target is a trading company. SSE eligibility depends on the trading-company test, which is restrictive for property-investment SPVs (they typically fail) but possible for genuinely trading property-development SPVs.

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How the levers interact

The conflicts to manage:

  • Fragmentation versus marginal relief. More SPVs means tighter associated-companies divisor; the lever-2 cost works against the SDLT, liability, and lender benefits that drove the fragmentation choice.
  • Pension contributions versus current-year extraction. Pension contributions reduce current-year extractable cash; they produce long-run tax-relief that beats dividend extraction at higher rate bands.
  • s.171 transfers versus s.179 trap. Restructuring at no gain no loss makes sense for permanent restructures; for pre-disposal cleaning within six years, the trap reactivates the gain.
  • Group relief versus surrender capacity. Surrendering losses to a profitable group company is current-year efficient; carrying forward to a future period preserves optionality if profit levels shift.

The right answer is structure-specific. The decision framework is to map your structure against the seven levers, identify which apply, run the numbers for each, and document the choice. The audit trail matters as much as the lever choice itself.

Audit-trail discipline

For each lever decision, the audit trail HMRC looks at:

  • Board minutes recording the commercial rationale.
  • Written valuations supporting market rent for connected-party tenancies (lever 1).
  • Associated-companies count documented for each accounting period (lever 2).
  • Pension contribution employer-resolutions and trustee acknowledgments (lever 3).
  • Group relief surrender claims filed within the time limit (lever 4).
  • s.171 elections and supporting valuations for intra-group transfers (lever 5).
  • Capital allowance computations with supporting expenditure invoices (lever 6).
  • CIR computations and Group Ratio elections where applicable (lever 7).

HMRC's enquiry window for CT is 12 months from filing (extended to 4 years for careless under-declaration, 6 years for deliberately careless, 20 years for deliberate). Maintain the audit trail in real time, not retrospectively when the enquiry lands.

Where this page sits in the cluster

This is the pillar / orchestration page. The child pages cover each lever in depth: