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I Sumar & Co tax calculators and free business resources

Free UK Tax Calculators, Guides & Resources

Practical tools and plain-English guides from I Sumar & Co Accountants. Estimate your tax, check a deadline, or download a useful guide - all free and always up to date.

We have put together a set of free resources for UK business owners, sole traders, landlords and individuals - the same tools and information we use every day with our clients. Use them to get a quick estimate, check a deadline, or simply understand the rules. If you would like one of our accountants to look at your situation properly, every resource here ends with a free 15-minute consultation.

Free UK Tax Calculators

These calculators are built and maintained in-house by our own accountants and are updated to reflect the latest HMRC rates and thresholds. They are provided as a guide to help you estimate your position and do not replace tailored advice; please confirm any figure with us before relying on it for filing or planning.

Key UK Tax Deadlines

The deadlines that catch UK businesses out most often. We track these for every client - but it helps to know them yourself.

Deadline

When

Applies to

Self Assessment online filing

End of January, following the tax year

Sole traders, landlords, directors, anyone with untaxed income

Self Assessment payment

End of January, with the return

All Self Assessment taxpayers

Payments on account

End of January and end of July

Self Assessment taxpayers above the threshold

VAT returns

One month and seven days after the VAT period end

VAT-registered businesses

Corporation tax payment

9 months and 1 day after company year-end

UK limited companies

Corporation tax return (CT600)

12 months after company year-end

UK limited companies

Annual accounts (Companies House)

9 months after company year-end (private companies)

UK limited companies

Confirmation statement

At least once every 12 months

UK limited companies

Payroll (RTI)

On or before each payday

Employers running PAYE

P60s to employees

By 31 May

Employers running PAYE

Free Guides

Short, practical guides written by our team.

Starting a UK Limited Company

A 10-Step Guide

Sole Trader Expenses

What You Can and Cannot Claim

Switching Accountants

A Step-by-Step Guide

Filling Out Tax Form

Ready to Get Started?

Book your free 15-minute consultation today and find out how much simpler - and cheaper - your accounting could be.

Book A Free Consultation
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