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Self Assessment — Guides, Tips & Expert Advice

Self assessment tax return guides, tips, and deadlines for UK sole traders and freelancers.

96 articles on Self Assessment

Self Assessment

Self Assessment for the First Time: What to Expect and How to Prepare

Filing your first Self Assessment tax return can be daunting. This guide walks you through the entire process step by step so you know exactly what to expect.

17 March 2026·4 min read
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Self Assessment

Self Assessment for Landlords: Rental Income Guide

How to report rental income on your Self Assessment return, what expenses you can claim, and the mortgage interest restriction explained.

17 March 2026·2 min read
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Self Assessment

Self Assessment for Foreign Income

UK tax residents must report worldwide income. Here is how to handle foreign income on your Self Assessment return.

17 March 2026·2 min read
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Self Assessment

Self Assessment and HMRC Investigations: What to Know

HMRC can open an investigation into your Self Assessment return. Here is what triggers one, what to expect, and how to respond.

17 March 2026·2 min read
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Self Assessment

Late Filing Your Self Assessment: Penalties and What to Do

If you have missed the Self Assessment deadline, here is what penalties you face and the steps to take right now.

17 March 2026·2 min read
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Self Assessment

How to Log In to Self Assessment Online

A quick guide to accessing your Self Assessment account online through Government Gateway.

17 March 2026·1 min read
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Self Assessment

Self Assessment and Business Losses: How to Carry Forward

If your business makes a loss, you can use it to reduce future tax bills. Here is how loss relief works through Self Assessment.

17 March 2026·2 min read
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Self Assessment

Self Assessment Marriage Allowance: How to Claim

The Marriage Allowance lets you transfer part of your personal allowance to your spouse, saving up to £252 per year.

17 March 2026·2 min read
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Self Assessment

Self Assessment with Multiple Income Sources

If you earn from several sources, your Self Assessment return needs to capture them all. Here is how to report multiple income streams.

17 March 2026·2 min read
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Self Assessment

Self Assessment: Do You Need a National Insurance Number?

Yes, you need your NI number for Self Assessment. Here is why and how to find it if you have lost it.

17 March 2026·1 min read
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Self Assessment

Self Assessment Online vs Paper Returns: Which to Choose

Online filing is faster, has a later deadline, and gives instant confirmation. Here is why almost everyone should file online.

17 March 2026·1 min read
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Self Assessment

Self Assessment Overlap Relief: End of Transitional Year

Overlap relief was eliminated by basis period reform. Here is what happened and what it means for your returns.

17 March 2026·1 min read
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Self Assessment — Guides, Tips & Expert Advice | Accounted Blog