The top 5 accounting firm profitability blind spots (and how to handle them)

Profitability blind spots thrive in accounting firms. While you’re busy focusing on your clients, they take root and grow.

This is a problem. The longer they’re left, the more money your firm loses.

They are near impossible to spot manually; no firm ever has enough staff to dig them out. In recent years, new priorities have constantly got in the way. COVID kicked things off, followed by Making Tax Digital for Accounting Tax (MTD for IT) – the biggest transformation in tax for three decades. Add the uncertainty of AI adoption to the mix and there’s plenty to divert one’s eye from the ball.

For each of these you had to think not only about how they affect your firm, but also your clients.

It’s time to look inward

All of this means the day accounting firms ask “where are we losing money” slips further away. Accountancy is a client-focused profession; it’s understandable if you put their wellbeing before your own.

The trouble is, in the meantime, partners end up making decisions about pricing, resourcing, recruitment, and growth based on gut feel, habit, or incomplete information. That works up to a point, but it creates those profitability blind spots. And as firms scale, compliance margins tighten, and the market shifts towards advisory, the cost of not asking  money-centric questions becomes greater.

At some point we, as accountants, must look inward. We must shine a light on areas where profit is being lost.

You, your partners, and your staff deserve the full rewards of your hard work. The firm must also take the next step on its growth journey.

About this blog

This blog focuses on five profitability questions every accounting practice needs to answer confidently. It also considers what it means commercially when they can’t.

Behind each question is a blind spot that commonly goes unnoticed:

1. Your recovery rate by service line
2. Ageing WIP
3. Senior partners taking on work below their charge-out rate
4. People doing too much non-chargeable time
5. Being unable to single out the most profitable clients

The blog will consider why these blind spots form, how firms in the US have tackled them, and what you can do tomorrow to start fixing things. At the end we’ll talk about how a dedicated tool – IFM – can help put recovery, aged WIP, staff chargeability, and client profitability in front of you as live data.

Understanding the five major profitability blind spots affecting accountancy firms

Let’s take an in-depth look at the profitability blind spots many accounting firms have.

We’ll do that by asking ourselves five questions.

If you can answer the question, you don’t have a blind spot in that area. If you can’t provide an answer, there’s work to be done.

#1 What is your recovery rate by service line?

Margin by service line is one thing – all you have to do is look at your firm’s rates and staff pay to uncover that. But the real problem is it’s often difficult to see how much money is really being brought in. Are you getting paid for all chargeable hours worked?

It’s important to break it down to each task you do for your clients. See what the yield is from your tax, bookkeeping, audit, payroll and other service lines. Each carries a different margin profile, client expectation, and write-off risk.

Without this service-line visibility, you can’t distinguish between work that makes money and work that keeps staff busy.

The typical firm-wide reality

As firms grow from small to mid-size, many develop a rough, back-of-envelope recovery rate. This is often held in the mind of one or two partners who’ve been there long enough to work it out instinctively.

But this number is rarely formalised, tracked, and broken down to a level that would let you run a comparison. For example, could you compare the recovery rate on your firm’s personal tax returns to those in accounts and advisory work?

What happens when you don’t know the data around your service lines

In short, you can’t price accurately. You can’t identify which services are being systematically undercharged. You can’t have an informed conversation with a client about fee increases, because you don’t have the evidence to support it. At a strategic level, you won’t know where to invest for maximum growth.

#2 How much work in progress (WIP) has been there more than 90 days?

Put simply, you need to appreciate how much WIP is ageing in the system, and how long it has been sitting there. Some WIP ageing is normal – complex jobs take time. But WIP sitting unbilled beyond 90 days is usually a sign of something else.

It generally signifies work waiting to be billed. But the longer you put off an invoice, the more it’s like you’re effectively loaning a customer money. That’s money earned but not in your bank account – capital tied up in work that may never fully convert to revenue.

If there is a lot of WIP over 90 days, this is usually a symptom that something is wrong. The common culprits are scope creep that hasn’t been addressed, a client relationship where the fee conversation has been avoided, work that’s been started but parked, or jobs where the original estimate was wrong and nobody wants to write it off. If WIP has been there that long, there’s probably a conversation to be had with the client, and that conversation will be an awkward one.

The typical reality in accounting firms

Most firms know their total WIP figure. That said, not all can tell you how much has been in the system over 90 days. Fewer can tell you which clients, which service lines, or which teams are responsible for the bulk of it.

The price you pay for not knowing your WIP data

Aged WIP tends to accumulate unseen, often in the busiest teams, and only gets attention at year-end or when cash flow tightens. By that point, the write-off is already baked in.

Not knowing your WIP data also distorts your pipeline picture: your firm looks busier and healthier than it really is.

#3 How are your senior partners spending their time?

In most practices, partners are the most expensive resource. Used poorly, they are also the biggest constraint on growth.

How they spend their time is arguably the single most important allocation decision in the practice. Their time has the highest charge-out rate, and they’re typically the only people who can win new work, manage key client relationships, and make strategic decisions about the firm’s direction.

So, here’s an important thing to consider: if you charge a senior partner out at £400 an hour, are they actually doing work at that level, or are they spending their day on tasks worth £150?

This can happen very easily. Partners have spent their career rolling up their sleeves and helping clients no matter what. Many still carry their own client books, handle compliance work personally, and manage their teams through informal check-ins rather than structured workflows. But jumping on tasks, regardless of what they are worth, is a habit that top tier accountants must shake. Why? Because it means a firm is spending its scarcest resource on the wrong things. While they’re doing basic tasks, they could be advising clients and setting out strategies that add serious value.

How firms often manage their partners’ time

Time recording, where it happens at all at partner level, is often retrospective, incomplete, or categorised too broadly to be useful. The result is that nobody – including the partners themselves – has a clear picture of how much of their time is allocated between client delivery, business development, management, and admin.

The price you pay for not knowing what your partners are focused on

If your most expensive people are spending 70% of their time on compliance delivery that a senior manager could handle, you’re paying partner rates for manager-level work. As a result, your margin takes a hit.

But the strategic cost is bigger: the firm’s growth ceiling is limited by the partners’ available hours. Without the right data, nobody can see this clearly enough to change it.

#4 What percentage of attended time is chargeable?

This question is all about utilisation, but the framing is designed to make you pause and reflect. Attended time strips out holidays, sickness and part-time arrangements. It asks: of the hours your people are actually carrying out work, how much of that time is being recorded against chargeable client tasks?

It’s usual for a 37.5-hour week to include around 30 chargeable hours. This allows for some non-billable time but not too much. Are your people hitting that number, or are they sitting at, say, 25 or 26 chargeable hours? If it’s lower than expected, you need to know why.

The answer is never laziness. The gap between attended time and chargeable time is where capacity leaks live – internal meetings, admin, rework, unbilled client calls, training, and time that simply isn’t captured.

The great news is that nobody likes to feel unproductive; if you get the data and implement a fix, your staff will thank you for it.

The typical reality on the ground

Most firms track utilisation at some level, but the definition varies wildly. Some measure against contracted hours, available hours, or a target that was set years ago.

That’s why we put the focus on attended time. The chargeable-to-attended ratio is a more demanding measure, and most growing practices would struggle to produce this number consistently across the team. Where they can, it’s often lower than partners expect. This is particularly true of mid-level staff, who carry a disproportionate share of internal and administrative tasks.

What it costs if you don’t have oversight of chargeable time

Every percentage point of attended time that isn’t chargeable is capacity you’re paying for but not converting into revenue. In a 50-person firm, even a five-point improvement in chargeable utilisation can be worth hundreds of thousands of pounds in recovered fee income annually.

But you can’t improve what you can’t see. If you don’t have this metric, workforce planning becomes guesswork: firms recruit when they feel busy rather than when the data shows a true capacity gap.

#5 Which clients are your most profitable?

Firms can pull a report on their biggest clients by fee in seconds. Profitability, however, is a different question.

Revenue and profitability are not the same, but many practices manage their client base as if they are. They hope that, somehow, margin follows.

A 30-year relationship you charge the most for might carry a wafer-thin margin, because you’ve never raised prices in line with inflation. That client might be demanding, have complex needs, frequent scope changes, and slow payment terms. This can be far less profitable than a smaller client with clean, repeatable work and straightforward requirements.

Who would you rather spend time with?

Ultimately, this means a client outside your “Top 10” could be making you more money. Those are the clients to spend more time with: they value your efforts, they’re open to advisory conversations, and there’s room to make the account more profitable still.

The typical reality in accounting firms

Client profitability analysis is rare in smaller and growing firms. Most firms can rank their clients by fee income, but few by profit after accounting for:

• The time spent
• The seniority of resource used
• The write-offs absorbed
• Overheads attributable to servicing that relationship.

What happens when accounting firms don’t know which clients are profitable?

You end up over-servicing unprofitable clients and under-investing in profitable ones. Fee negotiations happen without evidence. Partner time gets allocated to the loudest or largest clients rather than the most commercially valuable ones. And when it’s time to grow – whether through recruitment, service expansion, or acquisition – the firm can’t identify where the best returns come from.

The big problem – why these five things remain hidden in UK accounting firms

The reality is that with so much time currently focused on clients, it’s hard to turn that same stellar expertise towards your own firm.

You might not have the data, but you can see the warning signs, however. One red flag is that there’s no single way of maximising revenue. For example, one partner might doggedly chase every outstanding invoice in days, another at the same firm might leave it three months.

Do you crack down on this symptom? Knowing how capable your top staff are, you probably don’t want to press them into copying one another. That would not go down well in a partners’ meeting.

It would also – rightly – feel ad hoc, because you have no data to back up your preferred way of doing things.

The answer is data and a system, not a debate

The good news is that uncovering and resolving blind spots is not about confrontation, whether that’s “dealing with” a wayward partner or a difficult client. It’s more about putting an impartial, efficient system in place.

This system focuses on profit using data, not instinct. It’s one that tracks recovery rate, monitors WIP, sees who is doing what, highlights how much work is chargeable, and identifies the most profitable clients.

We even have a model for this kind of success. Let’s explore how accountants in the USA are tackling blind spots.

Blind spots are an international problem, but they are being handled differently overseas

Nobody is perfect, but one thing we are seeing in accountants in the US is a switch away from having partners be the firm’s credit control. Instead, they have a system automatically chase money owed.

This same system addresses recovery rates, neglected WIP, chargeable time and which accountants should be focused on which clients. Staff are effortlessly allocated work from a dashboard

This isn’t to say they are doing anything “better”. The real difference between the UK and the US is that tools for this analysis have been more commonplace in those territories.

At IRIS, we’ve fixed that for UK accountants.

Software that shines a light on profitability blind spots – and handles the rest

IRIS Firm Management can answer the five profitability questions we asked earlier and help you manage your staff.

It automatically brings data into one place, allocates work, and chases outstanding invoices.

IFM in action

The idea behind IFM is that a partner logs in and everything is there: recovery by service line, aged WIP, staff chargeability, and client profitability. This data is live.

It can be used to decide who does what task and when. No drawn-out meetings, no debate, because the decision is informed by rates and margins. Staff just pick up the work from their dashboard without any waiting around.

If there are any bottlenecks, you’ll see them before a client can complain. The same goes for unbilled WIP – it can be invoiced automatically. Just agree your service levels from the outset and then enjoy instant billing as work rolls out.

With IFM’s help, accounting firm profitability blind spots are illuminated; the big five questions we posed become guiding lights for your firm. That means less time running on instinct and fumes and more time making clear, growth-focused decisions.