The Mistakes We Fix Most Often: Real Problems Caused by Previous Accountants (And How You Can Avoid Them)

November 26, 2025

The Mistakes We Fix Most Often: Real Problems Caused by Previous Accountants (And How You Can Avoid Them)

Introduction

The brown envelope landed on the desk with a soft thud.

Outside, the Aberdeen rain was hitting the windows sideways. Inside, the owner of a growing Scottish business turned the envelope over in their hands, already uneasy. It was from HMRC. No bold red letters. No scary words. Just a polite request for “some clarification” on last year’s figures.

They opened it. The room seemed to shrink. 

HMRC were asking about numbers that didn’t quite line up. Income looked higher than reported. Some expenses didn’t appear at all. A director’s loan balance seemed off. Nothing dramatic on its own, but enough for HMRC to say: “Please explain.”

The business owner did what most people would do. They forwarded the letter to their accountant. No reply. They phoned the office. No answer. Days went by, the deadline crept closer, and the sick feeling in their stomach grew.

When they finally came to us at A2Z Accounting Solutions in Aberdeen, they were worried about fines, penalties, and the possibility that they had done something seriously wrong. The reality was simpler and more frustrating. Their previous accountant had rushed, guessed, and left gaps. HMRC had simply noticed.

Why These Accounting Mistakes Happens So Often

If this story feels uncomfortably familiar, you are not alone. Across the UK, and especially in Scotland where many businesses run lean and move quickly, owners rely on accountants to “just sort it.” Numbers get handed over, accounts are signed, and life moves on—until something doesn’t add up.

The truth is, the accounting world is full of pressure. 

• Some firms take on too many clients. 
• Some push work down to juniors who don’t fully understand the rules yet. 
• Some still rely on clumsy spreadsheets. 
• Others use modern software, but never slow down long enough to check what it’s actually doing.

Because of that, bookkeeping errors, payroll issues, incorrect postings and VAT mistakes are far more common than most directors realise. Not fraud. Not anything malicious. Just simple, avoidable errors that build up over time. And because the bottom-line profit still looks “about right,” nobody spots them. Until HMRC does. Or a lender does. Or you try to sell or grow the business and the numbers suddenly don’t stand up to close inspection.

What’s Really Going Wrong

Most of the problems we fix fall into three simple buckets. No jargon, no complexity—just three areas where things quietly go off track.

1. Wrong information going in

If the numbers going into your system are wrong, everything that follows is built on sand.

• Maybe a payment is posted as income when it’s really a loan. 
• Maybe a personal expense is put through as a business cost. 
• Maybe a supplier invoice is dated in the wrong month. 

None of these feel dramatic at the time. But together, they twist the picture of how your business is really doing. These bookkeeping errors distort your accounts and create HMRC risks later.

2. No proper checks

Good accounting is not just typing numbers into software. It’s checking, cross-checking, and asking, “Does this make sense?” When checks are rushed or skipped completely, small differences in bank balances, VAT figures, or payroll calculations get carried forward. Over months and years, those differences add up.

3. Poor communication

Many business owners sign year-end accounts they don’t truly understand. Not because they are careless, but because nobody has taken the time to walk them through the figures in everyday language. When you don’t understand what’s been filed, you can’t spot when something is off. You’re driving in the dark.

What These Accounting Mistakes Lead To

So what actually happens when your previous accountant has made mistakes? It usually shows up in one of a few ways.

HMRC questions and enquiries

HMRC might write to you, asking why numbers don’t line up. 

• Sometimes it’s about VAT. 
• Sometimes it’s payroll. 
• Sometimes it’s directors’ loans. 

In many cases, the business hasn’t done anything deliberately wrong, but the records don’t support the figures sent in. That’s when you feel exposed.

Unexpected tax bills

If expenses have been claimed incorrectly, or income hasn’t been reported in the right period, your tax bill can suddenly jump. We often see situations where a tidy-up of past years reveals extra tax due. That’s never a nice conversation, but it’s far better to deal with it proactively than wait for HMRC to call it out.

Confusing or misleading management reports

If the underlying bookkeeping is messy, your profit and loss report may tell you very little. You might think a certain service is doing well when it isn’t. You might believe you can afford a new hire when cash flow is actually tight. Poor numbers don’t just cause tax issues. They lead to poor decisions.

Stress, doubt, and lost confidence

Perhaps the biggest cost is emotional. When you stop trusting your figures, every decision feels risky. You hesitate. You second-guess yourself. You worry that there might be a problem lurking in the background. For a lot of owners, that constant low-level worry is worse than any one HMRC letter.

Where Many Accountants Fall Short

Most accountants don’t set out to cause problems. But there are some common weak points in the way many firms work:

• Work is rushed at busy times, especially around tax deadlines.
  • Bookkeeping is pushed to the cheapest resource, with little review.
  • Reviews are done quickly, with more focus on deadlines than accuracy.
  • Communication is limited to a once-a-year chat, if that.
  • Outdated processes make it hard to track and fix errors.
  • When HMRC gets in touch, the client is left to handle most of it alone.

We see the results of these gaps when new clients come to us with years of accounts that just “don’t feel right,” or with stacks of old queries they never fully understood.

How A2Z Accounting Solutions (Aberdeen) Prevents These Problems

Our focus at A2Z Accounting is simple: safe, accurate, clean numbers and accurate bookkeeping services that you understand and can rely on. We’re not interested in cutting corners to be the fastest. We care about being the most reliable pair of hands in the room.

Here’s how we protect our clients from the kinds of mistakes we’ve just explored:

Thorough checks, not just data entry

We don’t treat bookkeeping as a low-value task. Every set of records is reviewed. Bank accounts are reconciled. Balances are checked. If something doesn’t make sense, we ask. That takes more time, but it saves a lot of trouble later.

Plain-English explanations

We explain accounts and taxes in everyday language. No jargon. No hiding behind technical terms. When you understand your numbers, you are safer and more confident.

Modern systems with a human eye on them

We use reliable modern tools, but we never trust software blindly. Automation can speed things up, but it still needs human judgement. We combine good technology with careful review.

Regular touchpoints, not once-a-year contact

We stay in contact through the year, not just at year-end. That means we can flag issues early, help you plan for tax bills, and keep your records tidy rather than doing a mad rush at the end.

Standing with you when HMRC calls

If HMRC has questions, we don’t disappear. We gather the information, explain what’s happened, and talk you through every step. That alone removes a huge amount of stress.

Practical Steps You Can Take Right Now

Whether you work with us, stick with your current accountant, or are still deciding, there are simple actions you can take to protect your business.

1. Ask for a walk-through of your latest accounts

Set aside an hour and ask your accountant to talk you through the accounts in plain English. Ask what changed from last year, how your profit is made up, and what your tax position looks like. If you leave the meeting more confused than when you went in, that’s a sign something isn’t right.

2. Check that your bank accounts are fully reconciled

Ask a very simple question: “Are all my bank accounts reconciled up to the last statement?” If the answer is no, or if you get a vague response, push for this to be fixed. Reconciled banks are the backbone of accurate accounts.

3. Keep business and personal spending separate

Where possible, avoid mixing personal spending with business accounts. It makes everything harder to track and more likely to be treated incorrectly. A clean business bank account and card make life easier for you and your accountant.

4. Tell your accountant about changes as they happen

Taking on staff, buying vehicles, opening new locations, switching to more online sales—these all have tax and accounting implications. The earlier your accountant knows, the better they can plan and protect you.

5. Ask for a mid-year tax estimate

Don’t wait until the year is over to find out what you owe. A mid-year estimate (or even quarterly estimates) can prevent nasty surprises and give you time to set money aside calmly.

6. Trust your instincts if something feels off

If your gut feeling is that the numbers don’t reflect reality—listen to that feeling. You know your business. If the accounts say you’re thriving but the bank balance feels tight, or the other way round, it’s worth asking for a deeper look.

Bringing the Story Back to Safety

Let’s return to that brown envelope on the desk in Aberdeen. After we carefully went through the records, corrected past mistakes, and prepared a clear explanation for HMRC, the outcome was calm and controlled. Some adjustments were needed. There were honest errors to fix. But with clean records and clear answers, the matter was closed without drama.

The business owner’s relief was obvious. They went from feeling exposed and unsure to knowing exactly where they stood. No more guessing. No more quiet worry about what might be hiding in the accounts. Just steady, accurate numbers they could trust.

That’s what good accounting should give you, not just a tax return filed on time, but confidence. Confidence that your business is safe with HMRC. Confidence that the picture you see in your reports matches reality. Confidence that when you grow, invest, or change direction, the numbers will support you rather than hold you back.

If you’ve ever had that unsettled feeling about your accounts, know this: you are not stuck with it. With the right support, careful checks, and clear explanations, the story can move from worry to reassurance. The brown envelopes can go back to being just paper, not a source of dread.

And you can get back to what you do best, running and growing your business, knowing that your numbers are not only done, but done properly.

Ready for Clean, Accurate Numbers You Can Trust?

If you’re tired of dealing with bookkeeping errors, confusing reports, or surprise HMRC letters, our team at A2Z Accounting Solutions in Aberdeen is here to help.

We specialise in fixing the mistakes left by previous accountants and building reliable, compliant systems that support your business long-term.

Book a consultation with our Aberdeen accountants today to regain confidence in your numbers and keep HMRC off your back.

FAQs:

Q: What should I do if my previous accountant has made mistakes?

A: Ask for a full review of your books, including bank reconciliation, VAT returns, payroll, and year-end accounts. A qualified accountant can amend filings, correct errors, and communicate with HMRC to protect you.

Q: Can errors from a previous accountant cause HMRC problems?

A: Yes. Incorrect bookkeeping, VAT mistakes, or payroll errors can trigger HMRC enquiries. Fixing issues early reduces penalties and stress.

Q: Can I switch accountants if my previous one left a mess?

A: Absolutely. You can switch accountants at any time. Your new accountant can handle the entire handover and correct old mistakes without disrupting your business.

Q: What mistakes do accountants commonly make?

A: VAT errors, incorrect expenses, payroll issues, missed bank reconciliations, and incorrect director’s loan balances are the most common.

Q: Am I responsible for mistakes made by my previous accountant?

A: Yes — HMRC holds the business responsible. But proactive correction often reduces penalties.