🇬🇧UK Family Office Records and Tax Evidence

Concept

For UK residence and offshore exposure, records are legal evidence, not administration. A family office file should prove the facts that decide residence, source, situs, treaty position, trust attribution, company control and foreign tax credit. Since 6 April 2025 the system turns on residence rather than domicile, so the count of UK-resident years is itself a fact the file must evidence. The UK rules turn on factual tests, so the file either reconciles those facts or it does not.

The Statutory Residence Test still depends on days and ties under RDR3, and its thresholds are unchanged for 2026/27; foreign income runs through the Self Assessment foreign pages (SA106); account data is exchanged under the framework HMRC describes in IEIM400080. The same day count now drives the four-year foreign income and gains relief and the long-term-resident test for inheritance tax, and the data HMRC already receives has to match the return. A record system that cannot tie those together is not fit for a mobile family.

The 2025 residence regime

Domicile stopped driving UK tax on 6 April 2025. Income tax and capital gains now follow the residence test, and the old remittance basis is closed. A qualifying new resident, someone who was non-UK resident for the ten tax years before arrival, can claim full relief on foreign income and gains for the first four tax years of UK residence; after that, worldwide income is taxed in full.

Inheritance tax moved to the same logic. A long-term resident, UK resident for at least ten of the previous twenty tax years, is within IHT on worldwide assets, and that exposure trails departure by three to ten years depending on how long the person was resident. Domicile, deemed domicile and the formerly-domiciled-resident category are gone.

Former remittance-basis users have a narrow window. The Temporary Repatriation Facility lets them designate pre-April-2025 foreign income and gains and remit at 12% across 2025/26 and 2026/27, rising to 15% in 2027/28, against headline rates of up to 45%. Every designation, and the pool it draws from, has to be documented while the facility is open.

Overseas workday relief survives in reduced form, tied to the same four-year window and subject to an annual cap, so the office must split employment days between UK and overseas duties and keep the contracts and payroll that support the apportionment. The relief is worthless without the day-level evidence behind it.

What the file must prove

The operating record set covers founders, spouses, children, trustees, protectors, investment companies, bank accounts, portfolios and advisers across jurisdictions. It must answer who owns what, who controls what, where decisions are made, where days are spent, which taxes were paid abroad, which returns were filed, which self-certifications were given, which trust benefits were received, and which documents support source of funds.

Why fragmentation fails

The recurring failure is scattered evidence: travel data with assistants, trust records with trustees, brokerage data with banks, residence opinions with advisers. HMRC or a bank sees the inconsistency before the family office reconstructs the file. An adviser opinion is not evidence on its own — it needs the source documents that prove the facts it relies on.

Checklist

• Maintain an ownership map indexed by person, entity, asset, account and tax year.
• Keep an SRT day log and family residence calendar updated through the year, not at filing.
• Hold a source-of-funds memorandum for wealth origin and each material transaction.
• Reconcile the income and gains register to the return and to CRS-reported data.
• Keep CRS and FATCA self-certifications consistent with the residence position.
• Store company governance and trust distribution records linked to the personal tax file.

Common mistakes

• Treating a document vault as sufficient without classifying records against legal positions.
• Relying on a residence calendar alone while company, trust and bank evidence is missing.
• Keeping adviser opinions without the underlying source documents.
• Letting bank self-certifications drift out of line with the tax return.
• Holding company records separately from personal records when owner-level rules depend on company facts.

Evidence in practice

Take a family that moves to the UK in 2025 after a decade abroad. For four years the file has to show the arrival date, each year's SRT result, and the foreign income and gains relieved under the four-year FIG claim. From year five the same family is taxed on worldwide income, and once it crosses ten resident years the worldwide estate falls within inheritance tax. The records that prove the four-year relief are the same records that later prove the IHT clock, so an office that keeps them as one continuous ledger avoids rebuilding the history twice.

If the same family used the remittance basis before 2025, the file also has to identify the pre-April-2025 pools and record each designation made against them under the repatriation facility. Those entries close after 2027/28, and an undocumented pool cannot be cleaned at the reduced rate once the window shuts.

Advisor trigger

A family office manager and accountant can run routine record-keeping when the structure is stable and the facts are clean. A UK tax lawyer should be engaged before a move to the UK, before a major transaction, when ownership or trust records cannot be reconciled, or when an HMRC enquiry tests the residence, source-of-funds or trust position.