The Real Cost of an In-House Bookkeeper vs. Outsourcing in 2025

The Numbers Most Practices Don't Calculate

When a practice owner thinks about the cost of an in-house bookkeeper, they typically think: salary. But the true cost is significantly higher — and when you account for all the hidden elements, outsourcing becomes a compelling financial case.

Full Cost of an In-House Bookkeeper (2024/25)

Here's a realistic breakdown for a qualified bookkeeper at the mid-range of UK market rates:

Cost ItemAnnual Cost |-----------|-------------| Gross salary (AAT-qualified)£28,000 Employer National Insurance£3,500 Pension contribution (3% min)£840 Holiday pay (28 days + bank holidays)Already in salary Holiday cover (temp or overtime)£1,200 Software licences£600 Training & CPD£800 Equipment (laptop, software)£400 Recruitment cost (annualised)£1,500 Management overhead£2,000 Total£38,840+

That's nearly £40k per year for a single bookkeeper — before you factor in sick leave, maternity/paternity cover, or the costs when they resign.

The Outsourcing Alternative

With Taxperts, you pay per hour of work delivered. Based on our average client profile (approximately 20 hours of bookkeeping per month):

ItemMonthlyAnnual |------|---------|--------| 20 hours at our standard rate£900£10,800 No recruitment, NI, pension£0£0 No software licences£0£0 Total£900£10,800

Annual saving: approximately £28,000 — on a single bookkeeper role.

But It's Not Just Cost

The cost argument is compelling. But the efficiency and quality arguments may be even stronger:

- No downtime: When your in-house bookkeeper is off sick or on holiday, work stops. With Taxperts, your account manager ensures continuity. - Scalability: In January you might need 50 hours; in June, 10. In-house staff can't flex like that. We can. - Quality: Our work is double-reviewed before delivery. Most in-house bookkeepers work in isolation without peer review.

When In-House Makes Sense

To be fair, there are situations where in-house might be preferable:

- If you need someone on-site with clients daily - If the work is so complex it requires deep, ongoing institutional knowledge - If you have significant management bandwidth to invest in training and performance management

For most practices, though, these factors don't apply — and the numbers strongly favour outsourcing.