There’s a financial planning mistake that costs people a fortune, yet almost nobody talks about it: your accountant, solicitor and financial adviser have probably never spoken to each other.
If you’ve ever extended your home, you’ll know the value of a good project manager. Someone who coordinates the architect, the structural engineer, the builders, the electricians, the plumbers. Without that central figure, chaos follows. The plumber installs pipes where the electrician planned cables. The decorator arrives before the plasterer has finished. Everyone does competent work in isolation, yet the project runs late, over budget, and full of costly fixes.
Your financial life works the same way. You might have a capable accountant handling your tax returns, a solicitor who drafted your will, and a financial adviser managing your investments. Three professionals. Three separate conversations. Often, zero coordination.
So you become the project manager. You relay messages, translate jargon, and hope nothing falls through the cracks. It’s exhausting. Worse, you can’t know what you’re missing.
This isn’t a niche problem. The Legal Ombudsman’s most recent data shows poor communication accounts for nearly a quarter of all complaints against legal professionals, with delay and failure to progress close behind. Wills and probate complaints rose 28% in a single year. The system is creaking.
The good news? The good news? This financial planning mistake is fixable. Understanding how it happens is the first step.
“Three professionals. Three separate conversations. Often, zero coordination.”
When the left hand doesn’t know what the right is doing
The problem shows up in specific, predictable ways. Here are four scenarios we see regularly.
The pension that bypassed the will
A solicitor drafts a tax-efficient will, carefully structured to minimise inheritance tax. But nobody checks whether the pension’s Expression of Wish form has been updated. Pensions typically sit outside your estate (until April 2027), so the will can’t override them. If the Expression of Wish still names an ex-spouse, or defaults to the estate itself, the pension could trigger an unexpected 40% tax bill. The solicitor did excellent work. So did the financial adviser. Neither checked what the other had done. Getting this alignment right is fundamental to making your wealth last across generations.
The business sale that missed a major relief
A business owner sells their company. The accountant and solicitor focus on the sale price and legal structure. Because no financial planner was involved, nobody considered using pension contributions to help with capital gains. The tax bill ends up tens of thousands of pounds higher than necessary. The window for planning closed the moment contracts were exchanged.
The capital gains collision
A financial adviser rebalances a portfolio, selling some holdings to improve diversification. Sensible enough. But in the same tax year, the client’s accountant is planning the sale of a second property. Without anyone joining the dots, both disposals happen in the same twelve months. The client breaches their Capital Gains Tax allowance twice over. A routine investment decision becomes an avoidable tax headache.
The divorce settlement that looked equal but wasn’t
During a divorce, the solicitor negotiates an offsetting agreement: one party keeps the house, the other keeps the pension. On paper, both assets are worth £500,000. But £500,000 in property equity and £500,000 in a pension are not the same thing. The pension is taxed on withdrawal. It can’t be accessed for years. Its real spending power is significantly lower. Without a financial planner calculating the true value, one party walks away with far less than they realised. We’ve written separately about how financial planning can ease the stress of divorce.
Why this financial planning mistake keeps happening
“The system assumes someone is joining everything up. Nobody is.”
None of this is malicious. It’s structural.
Accountants, solicitors and financial advisers train separately, qualify through different professional bodies, and answer to different regulators. The Solicitors Regulation Authority oversees lawyers. The Institute of Chartered Accountants governs accountants. The Financial Conduct Authority regulates financial advisers. Each profession develops its own language, its own priorities, its own way of framing problems.
Researchers call this “boundary work”: professionals protect their area of expertise and focus on delivering excellence within it. Your accountant optimises for tax efficiency this year. Your solicitor focuses on legal protection and estate structure. Your financial adviser concentrates on investment returns and retirement income. Each does their job well. But nobody’s job is to look after your whole financial life.
There’s a practical barrier too. Who pays for the conversation? Your accountant bills for accounting work. Your solicitor bills for legal work. A phone call to check whether your pension nominations align with your Will doesn’t fit neatly into anyone’s fee structure. So it doesn’t happen.
You end up as the link between your own advisers. You’re expected to remember what each professional knows, spot potential conflicts, and raise the right questions at the right time. But you’re not a tax expert, a lawyer, or a financial planner.
The system assumes someone is joining everything up. Nobody is.
The case for a lead adviser
Someone needs to own the whole picture, and financial planners are well placed to do it.
Here’s why. Accountants typically work in annual cycles, focused on tax returns and year-end planning. Solicitors often work on discrete projects: a will, a property purchase, a business sale. But financial planners work across your entire financial life and across decades. Retirement planning, tax efficiency, estate structure, protection, cashflow. The role is long-term and cross-cutting.
This makes the financial planner a natural hub. Not because accountants and solicitors are less important, but because the planning relationship is ongoing rather than transactional. Your financial planner should already understand your goals, your family circumstances, your business interests, and your tax position. They’re the logical person to spot when one piece of advice might conflict with another.
The FCA’s Consumer Duty, introduced in 2023, reinforces this. Regulated firms must now demonstrate they’re delivering good outcomes for clients, not just selling suitable products. Failures that harm clients are harder to defend than they once were.
Think back to the home extension. You wouldn’t expect the electrician to check in with the plumber. That’s the project manager’s job. Your financial life deserves the same.
It’s often called the Lead Adviser model. Here’s what it looks like in practice.
What joined-up advice looks like
The Lead Adviser doesn’t replace your accountant or solicitor. They work with them directly, so you don’t have to.
In practice, this means your financial planner picks up the phone. They check that your pension nominations align with the Will your solicitor drafted. They speak to your accountant before recommending a withdrawal strategy, so you don’t accidentally push yourself into a higher tax band. When you’re planning a business sale, they’re in the room early enough to structure things tax-efficiently, not called in after contracts have been exchanged.
This sounds simple, but it rarely happens.
At rockwealth, we build these conversations into our process. We liaise directly with your solicitor or accountant when decisions overlap. We consider if your Lasting Power of Attorney includes the specific wording needed for discretionary investment management, so your family isn’t locked out of your portfolio if you lose capacity. These aren’t conversations to postpone. Planning for later life works best when it starts early. We review your estate plan alongside your pension death benefits, not in isolation. We think about tax-year timing so investment decisions and property sales don’t collide.
The aim isn’t to do your accountant’s job or your solicitor’s job. It’s to make sure their work and ours fit together.
Questions to ask your adviser
Not every firm works this way. These questions will help you find out.
“How do you work with my accountant and solicitor?” Listen for specifics. A good answer describes a process: we contact them directly, we review documents together, we talk before major decisions. A vague answer tells you little.
“Will you contact them directly, or do I relay messages?” If you’re expected to be the go-between, nothing has changed.
“How do you make sure my will and pension nominations are aligned?” This is a basic check that catches one of the most common and costly mistakes. If your adviser hasn’t thought about it, that’s a warning sign.
“What happens when your advice might affect my tax position?” You want to hear that they’ll speak to your accountant before making recommendations, not after.
“Do you review my Lasting Power of Attorney for investment management wording?” Most people don’t know this is an issue until it’s too late. An adviser who raises it proactively understands how legal and financial planning intersect.
If the answers are vague or defensive, keep looking. The right adviser will welcome these questions.
Closing the gap
“You shouldn’t have to be the project manager of your own financial life.”
The home extension analogy only goes so far. A botched renovation is stressful and expensive, but you can fix it. Financial mistakes compound. A pension that goes to the wrong person, a business sale structured without tax planning, a divorce settlement that looked fair but wasn’t: these errors are often irreversible. The money is gone, or the window has closed.
But here’s what’s changed. You now know this financial planning mistake exists. You know it’s not about bad professionals, but about a system that doesn’t join up. And you know what to look for: an adviser who takes responsibility for the whole picture, who picks up the phone, who checks what your other professionals are doing before making recommendations.
You shouldn’t have to be the project manager of your own financial life. You’re paying for expertise. That should include making sure the experts talk to each other.
If you’d like to find out how this could work for you, get in touch with rockwealth and book a free consultation. We’re here to help.