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Rates, tools & reference
Tax Rates, HMRC Manuals and Reference Links for Accountants
Official links only, organised by task, with notes on who uses each one.
Official sources only · Links checked 23 September 2026 · Last updated 23 September 2026
Quick answer
The official sources for UK tax rates are on GOV.UK: Income Tax rates and allowances, VAT rates, Corporation Tax rates, approved mileage rates and HMRC interest rates. HMRC’s internal manuals explain how HMRC applies the law. Remindoo also offers free calculators and checklists.
Rates
Rates change at Budgets — check the date on each GOV.UK page.
| Task | Official link | Who uses it | Notes |
|---|---|---|---|
| Income Tax rates and allowances | Open Income Tax rates and allowances (opens in new tab) | Anyone | — |
| VAT rates on different goods and services | Open VAT rates on different goods and services (opens in new tab) | Businesses | — |
| Corporation Tax rates | Open Corporation Tax rates (opens in new tab) | Companies | — |
| Mileage allowance rates (business travel) | Open Mileage allowance rates (business travel) (opens in new tab) | Employers | — |
| HMRC interest rates for late and early payments | Open HMRC interest rates for late and early payments (opens in new tab) | Anyone | — |
Reference
Useful for technical queries and correspondence with HMRC.
| Task | Official link | Who uses it | Notes |
|---|---|---|---|
| HMRC internal manuals | Open HMRC internal manuals (opens in new tab) | Advisers | — |
| Exchange rates for customs and VAT | Open Exchange rates for customs and VAT (opens in new tab) | Businesses | — |
| Remindoo free calculators | Open Remindoo free calculators (opens in new tab) | Accountants | — |
| Remindoo free checklists | Open Remindoo free checklists (opens in new tab) | Accountants | — |
See it working with your own clients
Client references, payment reminders and deadlines in one place.
Keep all of this inside your practice management software
Store each client’s UTR, VAT number, PAYE reference, Accounts Office reference and Corporation Tax payment reference in custom fields on the client record. Create one payment instructions email template with tokens that fill in each client’s own reference, then send it to one client or in bulk before each deadline. Set automated reminders and recurring tasks for every payment date, and pull filing deadlines with Companies House sync. Remindoo doesn’t submit filings, take payments or connect to HMRC — it keeps the references and the reminders in one place.
See the Remindoo how-to guides and getting started.
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Frequently asked questions
Where can I find HMRC’s manuals?
HMRC publishes its internal manuals on GOV.UK. They explain HMRC’s interpretation of the law and are useful when preparing technical arguments, though they are not law themselves.
What are the approved mileage allowance rates?
GOV.UK’s Expenses and benefits: business travel mileage page sets out the current approved rates for cars, motorcycles and bicycles. Check it at the start of each tax year.
Where do I find HMRC late payment interest rates?
GOV.UK publishes HMRC interest rates for late and early payments. They move with the Bank of England base rate, so check the page when calculating interest.
Which exchange rates should I use for VAT?
HMRC publishes monthly exchange rates for customs and VAT on GOV.UK. Many firms also use them for other tax purposes when appropriate; check the relevant HMRC guidance.
Are Remindoo’s calculators free?
Yes. Remindoo’s calculators and checklists are free to use on remindoo.co.
How can I share rate changes with every client?
Write one update email, personalise it with tokens and send it in bulk to a filtered client list. Remindoo’s bulk emails and email templates make this a single job each April.
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See Remindoo with your own clients, or start free for 60 days with unlimited users.
Last updated 23 September 2026. General guidance, not regulatory advice. Always follow the official GOV.UK page.
Why recording every task matters in an accountancy practice
Accounting firms run on deadlines: VAT returns, payroll, confirmation statements, accounts and Self Assessment. Recording every job as a task, with an owner and a date, is the simplest way to make sure nothing is missed.
Avoid penalties
HMRC and Companies House charge penalties for late filing. A task for every deadline, with an internal date before it, gives the team a buffer.
Nothing depends on memory
Recorded tasks mean work continues when someone is off sick, on leave or has left the firm.
Consistent quality
Subtask checklists make every job follow the same steps and reviews, whoever does the work.
Visibility for managers
Filters by owner, status and deadline show at a glance what is late, what is due and who needs help.
Practical tips from UK practice
- Set an internal deadline two to four weeks before every statutory deadline.
- Use recurring tasks for repeat work such as VAT, payroll and bookkeeping.
- Break larger jobs into subtasks, including a review step.
- Comment on the task instead of by email, so the history stays with the work.
Related Remindoo features
Written and reviewed by Waqas Sagar ACA FCCA FMAAT, Chartered Accountant with 18+ years in practice. Founder and MD of Accotax, an ICAEW, ACCA and AAT regulated London practice that has served over 5,000 clients, and founder of Remindoo. Guidance is general; check current GOV.UK and professional body guidance for your firm.
What UK practices say about Remindoo
Read all reviews on Trustpilot“With Remindoo, everything from the first enquiry to onboarding and ongoing client management is tracked in one place… It saves us hours and gives me, as a practice owner, complete visibility of where the firm stands.”
“The biggest benefit is having clients, tasks, deadlines, workflows, proposals and communication all organised in one place.”
“During my trial, the team were absolutely amazing. They helped onboard my clients, set up my settings and made sure everything was ready for me to use… they made the whole process completely stress-free.”
“It brings client information, tasks, recurring deadlines, workflows and reminders together in one place, giving us much better visibility across the team.”
