Choosing an Inheritance Tax Specialist: What Good HNW IHT Planning Looks Like in Practice
For HNW clients, "an inheritance tax specialist" isn't a single profession. Good HNW IHT planning is genuinely cross disciplinary, typically involving a wealth manager or financial planner, a specialist tax adviser, a trust solicitor, and sometimes corporate counsel coordinated as a team rather than engaged separately. Most clients we work with arrive having engaged one of these in isolation. That is usually where the planning gaps sit.
Most articles about choosing an inheritance tax specialist treat IHT planning as a single discipline you delegate to a single adviser. For HNW clients, that framing is wrong. The IHT planning conversation interacts with pension architecture, business ownership structures, trust law, tax compliance, family governance, and personal estate documents. No single adviser is qualified to lead all of these and good HNW IHT planning involves explicit coordination across disciplines rather than serial engagement.
This article sets out what good HNW IHT planning actually looks like, what the disciplines involved are, and what to look for when choosing and coordinating the advisers around your estate.
Why HNW IHT planning isn't one specialism
UK inheritance tax sits at the intersection of distinct legal and financial domains.
The tax law itself is technical and changing: The 6 April 2026 BPR/APR reform reshaped the relief landscape (with a £2.5m allowance, 50% relief above that, and transferability between spouses), the April 2027 inclusion of unused DC pensions in the IHT estate sits twelve months ahead (personal representatives will be liable for reporting and paying any IHT due on those pension funds). Specialist tax advisers, typically chartered accountants or solicitors specialising in tax are needed to navigate the detail.
Trust law is its own discipline: Setting up, running, varying, or winding down trusts involves trust deeds, trustee duties, the relevant property regime (with 10 year and exit charges), and a body of case law that changes more slowly, but matters substantially. Pre-30 October 2024 settlements have transitional rules under the 2026 reforms. Trust solicitors are the specialist discipline here.
Pension and investment architecture sits with financial planners: The decisions on drawdown sequencing, partial annuitisation, asset allocation across wrappers, and the interaction with the post-2027 IHT regime are the financial planner's territory.
Business ownership structures, shareholdings, voting rights, succession of operational control, family investment companies sit at the intersection of corporate and tax law: For founders, this is often the largest single asset on the balance sheet, and the structural decisions made here are usually the highest value IHT planning lever available.
Personal estate documents such as wills, lasting powers of attorney, letters of wishes, executor appointments sit with private client solicitors who specialise in wills and probate.
For a HNW estate, all five disciplines typically need to be involved. The planning is genuinely cross disciplinary. The question isn't "who is my IHT specialist", it's "who is the integrator who keeps these conversations moving in coordination."
The four disciplines that typically need to be involved
The exact mix varies by case, but for most HNW clients the planning team includes:
A wealth manager or financial planner: The integrator. Holds the overall planning view, the cashflow model, the investment architecture, and the coordination across the other disciplines. For HNW IHT planning specifically, the wealth manager / financial planner is usually the right person to identify when specialist input is needed and from whom.
A specialist tax adviser. Ideally with HNW experience. Handles the technical tax questions, the BPR/APR reform interactions, EIS and SEIS reliefs, CGT planning around lifetime gifts, the offshore aspects of any non-UK family interests, and the corporation tax interactions for owner managed businesses.
A trust solicitor. Specialist in trust law specifically rather than general private client work. Drafts trust deeds, advises on trustee duties, handles deeds of variation and trust restructuring, and navigates the relevant property regime in practice.
A private client solicitor for wills and powers of attorney. Often the same firm as the trust solicitor in smaller practices, often a separate specialist in larger ones. Ensures the personal estate documents are current, correctly drafted, and properly executed.
For families with business interests, corporate counsel may also be involved, particularly around the share structure, voting rights, and the mechanics of any planned business transfer (sale, MBO, EOT, succession to family).
What good HNW IHT planning looks like in practice
Features distinguish good HNW IHT planning from generic advice.
Explicit coordination across disciplines
The wealth manager / financial planner, tax adviser, and trust solicitor are in active communication during planning decisions, not engaged serially with handoffs. The wealth manager / financial planner typically holds the master client view, the specialist advisers contribute on technical questions, written deliverables explicitly cross reference each other.
A current quantified plan
The plan models the IHT position under the current rules, identifies the specific levers being used (nil-rate bands, BPR/APR reliefs, lifetime gifting, s21 exemption discipline, trust structures, life insurance overlay), and quantifies the expected outcome. "We have an IHT plan" is not enough, the plan should produce a specific projected IHT charge and identify what is reducing it.
Regular review against legislative change
The 2024-2026 BPR reform and April 2027 pension changes both required existing plans to be revisited. Plans designed even three years ago may no longer be optimal. Good HNW IHT planning involves an annual structural review of the planning environment against the client's current position, with explicit recalibration where the rules have moved.
Quality flags vs red flags
A few practical signals worth attending to.
Quality flags
The adviser engages with the post-2026 BPR reform and post-2027 pension changes explicitly.
The adviser names the other disciplines that should be involved in your case.
The adviser produces a written quantified plan with specific levers identified.
The adviser charges a defensible fee structure that is transparent and proportionate to the work.
The adviser doesn't promise specific IHT outcomes (which depend on factors outside their control), but does commit to the planning process.
Red flags
The adviser describes themselves as a "single stop IHT specialist" without referencing the disciplines that good planning involves.
The adviser leads with product solutions (whole of life policies, AIM portfolios, EIS investments) before the underlying planning has been done.
The adviser hasn't updated their analysis for the post-2026 BPR reform or post-2027 pension changes.
Fee structures and what to expect
HNW IHT planning fees vary materially by case complexity but broadly:
Wealth manager / Financial planner integration and coordination: Typically charged as part of an ongoing advisory relationship, with the IHT planning being one element of the wider engagement. Standalone IHT planning engagements with a financial planner typically run £3,000 to £10,000 for the initial planning, depending on complexity.
Specialist tax adviser: Typically charged hourly (£250 to £750 an hour) or on fixed fee engagements for specific projects (£2,500 to £15,000 depending on scope).
Trust solicitor: Typically charged hourly for advice (£300 to £750 an hour) and fixed fee for trust setup and administration (£2,500 to £15,000 for a discretionary trust setup, lower for bare trusts).
Private client solicitor for wills and powers of attorney: Typically £500 to £3,500 for a will package depending on complexity, lasting powers of attorney £500 to £1,500.
For a HNW family with a £5m+ estate, the total annual cost of properly coordinated IHT and estate planning typically sits in the £5,000 to £35,000 range depending on the activity level. This is materially less than the IHT exposure being managed (40% above the nil-rate band and any reliefs).
Questions to ask before engaging
For prospects evaluating advisers, five questions tend to produce the most useful signal.
Which disciplines do you involve in HNW IHT planning, and how do you coordinate them? Good answers reference the wealth manager / financial planner, tax adviser, trust solicitor, and (where relevant) corporate counsel, and describe explicit coordination rather than serial handoffs.
How does the post-April 2027 pension change affect your planning for clients with significant pension wealth? Specific to the change that has reshaped drawdown architecture and succession planning.
What does your written plan typically include? Look for quantification, specific levers, and cross referenced deliverables rather than generic strategy documents.
What is your fee structure, and what does it include? Defensible answers are transparent and proportionate. Fees calculated as a percentage of projected IHT savings should be approached with caution.
What this means in practice
If you are reading this because you are evaluating advisers for IHT planning, three structural questions are worth working through:
Who currently coordinates your IHT planning across the disciplines that matter? If the answer is "no one" or "I coordinate it myself," the planning is almost certainly not running as efficiently as it could. The integration layer is where most of the value sits.
When was your plan last revisited against current legislation? Plans designed before October 2024 are operating off out of date rules. The 2026 BPR reform and 2027 pension changes both require explicit recalibration.
Are your advisers explicitly cross referencing each other's work? Good HNW IHT planning produces deliverables that reference each other, the financial planner's plan references the tax adviser's analysis, the trust deed references the planner's projections. If your advisers are working in isolation, the integration is missing.
The right approach for most HNW families is a wealth manager or financial planner who acts as the integrator, with specialist tax, trust, and private client input as needed. The integration layer is where the highest value planning happens.