CIS Self Assessment Deadline:
What You Need to Know and How TIK-TAX Can Help

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Missing the Self Assessment deadline can be an expensive mistake. HMRC gives you until 31 January each year to file your online tax return, or 31 October if you’re filing a paper version. If you miss these dates, you’ll face automatic fines, daily penalties, and potentially interest on any unpaid tax.

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TIK-TAX helps you stay ahead of these deadlines, ensuring everything is filed correctly and on time.

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And if you’ve already missed the date, we can help you appeal a self assessment penalty and get things back on track.

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Understanding HMRC’s Self Assessment Deadlines

Every year, self-employed people, landlords, and certain company directors must submit their Self Assessment tax return.

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HMRC expects this to be done by the same dates each year:

‍31 October for paper submissions and 31 January for online returns and payment.

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Even missing the deadline by a single day can result in a £100 automatic fine. The longer the delay, the higher the penalty becomes. TIK-TAX’s experienced team helps you avoid these stressful situations, managing your entire Self Assessment process from start to finish so you never miss another tax deadline.

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The Consequences of Missing the Deadline

HMRC penalties increase quickly once the Self Assessment deadline has passed.

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A £100 fine is issued automatically for any return submitted even one day late. After three months, daily penalties of £10 per day can apply for up to 90 days. If the return is still not filed after six months, HMRC adds another 5% of the tax owed or £300, whichever is greater.

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If a full year passes and you still haven’t filed, the penalty can rise further, especially if HMRC believes information has been withheld deliberately. Alongside these fines, interest builds up on any unpaid tax, meaning the longer you leave it, the more costly it becomes.

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TIK-TAX ensures you never have to deal with these complications by taking care of your filing and payment process on your behalf.

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Appealing an HMRC Penalty

If you’ve already received a penalty, TIK-TAX can still help. We offer a no win, no fee late filing and penalty appeal service designed to reduce or cancel unfair fines. Many taxpayers don’t realise that you can appeal a self assessment penalty if you have a genuine reason for missing the deadline.

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Our team will review your circumstances, file your outstanding return if needed, and manage your appeal directly with HMRC. We know exactly what evidence is required and how to present your case clearly, giving you the best chance of success.

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What Counts as a Reasonable Excuse?

HMRC may accept a late filing or payment appeal if you have a valid reason. This could be due to illness, a family emergency, a technical fault when submitting online, or incorrect guidance provided by HMRC.

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TIK-TAX can help you identify whether your situation qualifies as a reasonable excuse and prepare the necessary documentation for your appeal. Acting quickly makes all the difference, and our specialists handle the process from start to finish, so you don’t have to deal with the stress of dealing with HMRC alone.

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Understanding Late Payment Penalties

Submitting your tax return is only half the battle. If your payment is late, HMRC issues separate penalties for non-payment. Typically, you’ll be fined 5% of the unpaid tax after 30 days, another 5% after six months, and a further 5% after twelve months. Interest also accumulates on any unpaid balance.

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TIK-TAX can support you in managing or reducing these charges. In some cases, we can help negotiate payment arrangements or appeal penalties if you’ve had a reasonable excuse. Our goal is to minimise what you owe while keeping you compliant.

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Why Choose TIK-TAX?

TIK-TAX offers a complete end-to-end service for Self Assessment and HMRC appeals. We identify your tax requirements, file your return accurately, and, if necessary, handle any appeal against a self assessment penalty on your behalf. Everything is done for you, saving you time, money, and worry.

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Our no win, no fee approach means you only pay if we’re successful in appealing your penalty. Whether you need help filing this year’s tax return, disputing a fine, or getting back in control of your taxes, TIK-TAX provides expert advice and hands-on support every step of the way.

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Avoid Another HMRC Fine – Get Help from TIK-TAX Today

If you’ve missed the Self Assessment deadline or received an HMRC penalty notice, don’t wait until things get worse. Contact TIK-TAX today and let our specialists handle the full process, from filing your return to appealing any fines. The sooner you act, the better your chances of reducing or cancelling penalties altogether.

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Get in touch today to see how TIK-TAX can make your tax worries disappear.

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