Your local accountant.
Nationwide reach.
Fixed-fee accounting, HR and property services for small businesses, contractors and freelancers. One dedicated accountant you can WhatsApp anytime. SE London based, serving the entire UK.
26 services. Three pillars.
One dedicated accountant.
From daily bookkeeping to buy-to-let tax planning. Everything your business needs — accounting, HR and property — under one roof.
Accounting & Finance
Complete financial management for your business — from daily bookkeeping to year-end accounts and HMRC compliance.
View all services →- ✓ Accounting & bookkeeping
- ✓ VAT returns & tax compliance
- ✓ Self-assessment tax returns
- ✓ Year-end accounts
- ✓ Management accounts & financial reporting
- ✓ Making Tax Digital (MTD) setup & compliance
- ✓ Payroll services
- ✓ CIS returns
- ✓ Company formation
- ✓ Self-employment registration
- ✓ VAT registration
- ✓ Companies House compliance & filings
- ✓ Director ID verification (ACSP)
- ✓ Registered office & director service address
- ✓ Cloud accounting setup & support
HR Administration
Employment contracts, policies and compliance admin — so you can hire with confidence.
View all services →- ✓ Employment contract drafting
- ✓ HR documentation & policies
- ✓ Onboarding & offboarding admin
- ✓ Employment compliance support
- ✓ Statutory leave administration
- ✓ HR records management
Property Administration
Specialist property accounting for landlords — from single lets to full portfolios.
View all services →- ✓ Property accounting & bookkeeping
- ✓ Rental income tax returns
- ✓ Landlord compliance support
- ✓ Portfolio financial reporting
- ✓ Buy-to-let tax planning
Ready to ditch the hidden fees?
Get a fixed monthly price in under 2 minutes. No obligation.
Why businesses choose us
No Surprise Bills
Fixed-fee packages. You know exactly what you pay every month. No hidden charges. No hourly-rate anxiety. No year-end shocks.
Your Dedicated Accountant
Not a call centre. Not a ticket queue. You get one named accountant who knows your business — your goals, your numbers, your situation.
WhatsApp Us Anytime
Quick question? Send a WhatsApp. We respond fast. We're genuinely accessible — because accounting shouldn't be hard to reach.
Don't take our word for it
See what our clients say about working with Simplex.
"Simplex has taken all the stress out of my bookkeeping and VAT. Everything is clear, organised, and I always know where I stand."
"Since working with Simplex, everything has been much more organised. Highly recommend for anyone needing solid financial support."
"CIS, expenses, and bookkeeping all sorted with no hassle. Wish I found them sooner."
"Simplex takes care of all our bookkeeping, staff payroll, VAT submissions and HR admin. It's saved us time and helped us stay fully compliant."
Ready to switch to
fixed-fee accounting?
Book a free, no-obligation chat. Or just WhatsApp us — we're friendly, we promise.